CN212294739U - Coincide assembled city utility tunnel - Google Patents
Coincide assembled city utility tunnel Download PDFInfo
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- CN212294739U CN212294739U CN202020350077.2U CN202020350077U CN212294739U CN 212294739 U CN212294739 U CN 212294739U CN 202020350077 U CN202020350077 U CN 202020350077U CN 212294739 U CN212294739 U CN 212294739U
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- pipe gallery
- bottom plate
- adjusting rod
- steel plate
- prefabricated pipe
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Abstract
The utility model discloses a coincide assembled city utility tunnel, including prefabricated piping lane bottom plate and bed course basis, be connected with a plurality of can support prefabricated piping lane bottom plate and adjust between prefabricated piping lane bottom plate and the bed course basis apart from and prevent the adjustment mechanism of prefabricated piping lane bottom plate come-up between prefabricated piping lane bottom plate and the bed course basis. In the utility model, the upper section adjusting rod can be connected with the prefabricated pipe gallery bottom plate and support the prefabricated pipe gallery bottom plate through the matching of the supporting part of the upper section adjusting rod of the adjusting structure and the locking nut; simultaneously, because the upper segment is adjusted the pole and is in the same place with hypomere connecting rod threaded connection, consequently, can adjust the distance between prefabricated pipe gallery bottom plate and the bed course basis through rotating the upper segment and adjust the pole, moreover, spacing effect through lock nut on the upper segment is adjusted the pole enables the interval between prefabricated pipe gallery bottom plate and the bed course basis and keeps relatively stable, when pouring from dense concrete, can prevent that prefabricated pipe gallery bottom plate from producing the come-up.
Description
Technical Field
The utility model relates to a city utility tunnel technical field, concretely relates to coincide assembled city utility tunnel.
Background
The city utility tunnel is the national project of popularization, and the tradition construction is on-the-spot group mould, on-the-spot ligature reinforcing bar, cast in situ concrete. The field operation mode has low construction efficiency, slow progress and poor quality. Along with the development of building industrialization, the mature technology of assembly type building provides new construction mode for city utility tunnel, and coincide assembly type city utility tunnel obtains the wide application. Such superimposed assembly type pipe galleries are of a wide variety, the most common being single-deck floor constructions. But the coincide assembled city utility tunnel of present individual layer bottom plate structure is in the suspension state because its bottom plate does not have reliable connection with the bed course basis, when the cast in situ is from dense concrete, if control is not good, can lead to the bottom plate come-up, influences follow-up wallboard construction and piping lane quality.
SUMMERY OF THE UTILITY MODEL
The utility model provides a not enough to prior art, the utility model provides a coincide assembled city utility tunnel, it mainly solves be that current coincide assembled city utility tunnel's prefabricated piping lane bottom plate is mostly single layer construction, when pouring from dense concrete, prefabricated piping lane bottom plate is in the suspended state, produces the bottom plate come-up problem easily, brings inconvenient scheduling technical problem for follow-up wallboard installation.
In order to achieve the purpose, the utility model is realized by the following technical proposal:
a superposed assembly type urban comprehensive underground pipe gallery comprises a prefabricated pipe gallery bottom plate and a cushion layer foundation, wherein a plurality of adjusting mechanisms which can support the prefabricated pipe gallery bottom plate, adjust the distance between the prefabricated pipe gallery bottom plate and the cushion layer foundation and prevent the prefabricated pipe gallery bottom plate from floating upwards are connected between the prefabricated pipe gallery bottom plate and the cushion layer foundation, each adjusting mechanism comprises an upper section adjusting rod and a lower section connecting rod, the upper end of each upper section adjusting rod is vertically movably connected to the prefabricated pipe gallery bottom plate and can axially rotate relative to the prefabricated pipe gallery bottom plate, and a supporting part which can be supported at the bottom of the prefabricated pipe gallery bottom plate is formed on the upper section adjusting rod, a locking nut is connected at the upper end of the upper section adjusting rod in a threaded manner, mutually supporting through lock nut and supporting part can be in the same place upper segment regulation pole and prefabricated piping lane bottom plate link, and lower section connecting rod is vertical fixed connection on the bed course basis, and the lower extreme and the hypomere connecting rod threaded connection of upper segment regulation pole are in the same place.
Further, the prefabricated pipe gallery bottom plate is provided with an installation through hole, an upper section adjusting rod connecting piece is arranged at the bottom of the installation through hole, the upper end part of the upper section adjusting rod penetrates the upper section adjusting rod connecting piece and stretches into the installation through hole of the prefabricated pipe gallery bottom plate, the supporting part of the upper section adjusting rod is supported to the bottom of the upper section adjusting rod connecting piece, the upper section adjusting rod and the prefabricated pipe gallery bottom plate can be connected into a whole by locking a locking nut at the upper end of the upper section adjusting rod, and the prefabricated pipe gallery bottom plate is prevented from floating when self-dense concrete is poured.
Further, the upper segment adjusting rod connecting piece comprises a pre-buried fixed steel plate fixedly connected to the bottom of the installation through hole and a connecting steel plate fixedly connected to the bottom of the pre-buried fixed steel plate through field assembly, a pre-buried fixed steel plate through hole is formed in the pre-buried fixed steel plate, a connecting steel plate through hole is formed in the connecting steel plate, the upper end of the upper segment adjusting rod sequentially penetrates through the connecting steel plate through hole and the pre-buried fixed steel plate through hole and stretches into the installation through hole of the prefabricated pipe gallery bottom plate, and the supporting part of the upper segment adjusting rod abuts against the bottom of the connecting steel plate.
Furthermore, the locking nut, the connecting steel plate, the upper section adjusting rod and the lower section connecting rod are assembled and connected together in advance, and the pre-buried fixing steel plate and the connecting steel plate are fixedly connected together through field welding after alignment.
Further, the aperture of the connecting steel plate through hole is matched with the outer diameter of the upper end of the upper section adjusting rod, and the aperture of the pre-buried fixing steel plate through hole is slightly larger than the connecting steel plate through hole.
Furthermore, a plurality of welding through holes convenient for welding the steel plates are formed in the embedded fixed steel plates.
Further, be equipped with a plurality of buried steel bars that stretch of protrusion downwards on the peripheral position of the installation through-hole of prefabricated piping lane bottom plate, buried fixed steel plate is through with buried steel bar welding and fixed connection is on the bottom position of installation through-hole.
Further, the lower section connecting rod is a connecting steel bar fixedly connected to the cushion foundation.
Furthermore, the lower ends of the connecting steel bars are fixedly connected with the cushion foundation through adhesives.
Coincide assembled city utility tunnel, have following advantage:
because a plurality of adjusting mechanisms are connected between the prefabricated pipe gallery bottom plate and the cushion layer foundation, in the construction process, the upper section adjusting rod and the prefabricated pipe gallery bottom plate can be connected together and support the prefabricated pipe gallery bottom plate through the matching of the supporting part of the upper section adjusting rod of the adjusting structure and the locking nut; simultaneously, because the upper segment is adjusted the pole and is in the same place with hypomere connecting rod threaded connection, consequently, can adjust the distance between prefabricated pipe gallery bottom plate and the bed course basis through rotating the upper segment and adjust the pole, moreover, spacing effect through lock nut on the upper segment is adjusted the pole enables the interval between prefabricated pipe gallery bottom plate and the bed course basis and keeps relatively stable, can not change at will, when pouring from dense concrete, can prevent that prefabricated pipe gallery bottom plate from producing the come-up and leading to the inconvenient problem of follow-up wallboard installation.
Drawings
Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.
Fig. 2 is a partially enlarged view of a portion a in fig. 1.
Description of reference numerals:
1. prefabricated piping lane bottom plate, 2, bed course basis, 3, adjustment mechanism, 4, adhesive, 5, self-sealing concrete, 11, installation through-hole, 12, upper segment regulation pole connecting piece, 31, upper segment regulation pole, 32, lower segment connecting rod, 33, lock nut, 121, pre-buried fixed steel plate, 122, connection steel plate, 123, pre-buried reinforcing bar, 311, supporting part, 1211, pre-buried fixed steel plate through-hole, 1212, welding through-hole, 1221, connection steel plate through-hole.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Referring to the attached drawings 1 and 2, in the embodiment, the overlapped and assembled urban comprehensive underground pipe gallery comprises a prefabricated pipe gallery bottom plate 1 and a cushion foundation 2, a plurality of adjusting mechanisms 3 capable of supporting the prefabricated pipe gallery bottom plate 1, adjusting the distance between the prefabricated pipe gallery bottom plate 1 and the cushion foundation 2 and preventing the prefabricated pipe gallery bottom plate 1 from floating upwards are connected between the prefabricated pipe gallery bottom plate 1 and the cushion foundation 2, each adjusting mechanism 3 comprises an upper adjusting rod 31 and a lower connecting rod 32, the upper end of the upper adjusting rod 31 is vertically movably connected to the prefabricated pipe gallery bottom plate 1 and can axially rotate relative to the prefabricated pipe gallery bottom plate 1, a supporting part 311 capable of supporting the bottom of the prefabricated pipe gallery bottom plate 1 is formed on the upper adjusting rod 31, a locking nut 33 is in threaded connection with the upper end of the upper adjusting rod 31, the upper adjusting rod 31 and the prefabricated pipe gallery bottom plate 1 can be connected together through the mutual matching of the locking nut 33 and the supporting part 311, the lower section connecting rod 32 is vertically and fixedly connected on the cushion foundation 2, and the lower end of the upper section adjusting rod 31 is in threaded connection with the lower section connecting rod 32. In the embodiment, as the plurality of adjusting mechanisms 3 are connected between the prefabricated pipe gallery bottom plate 1 and the cushion foundation 2, in the construction process, the upper section adjusting rod 31 and the prefabricated pipe gallery bottom plate 1 can be connected together and support the prefabricated pipe gallery bottom plate 1 through the matching of the supporting part 311 of the upper section adjusting rod 31 of the adjusting structure and the locking nut 33; simultaneously, because upper segment is adjusted pole 31 and is in the same place threaded connection with lower segment connecting rod 32, consequently, can adjust the distance between prefabricated pipe gallery bottom plate 1 and the bed course basis 2 through rotating upper segment and adjusting pole 31, moreover, spacing effect through lock nut 33 on the upper segment is adjusted the pole 31, enable the interval between prefabricated pipe gallery bottom plate 1 and the bed course basis 2 and keep relatively stable, can not change at will, when pouring from dense concrete 5, can prevent that prefabricated pipe gallery bottom plate 1 from producing the come-up and leading to the inconvenient problem of follow-up wallboard installation.
Referring to fig. 1 and 2, in this embodiment, preferably, a mounting through hole 11 is formed in the prefabricated pipe gallery bottom plate 1, an upper-section adjusting rod connecting piece 12 is arranged at the bottom of the mounting through hole 11, an upper end portion of the upper-section adjusting rod 31 penetrates through the upper-section adjusting rod connecting piece 12 and extends into the mounting through hole 11 of the prefabricated pipe gallery bottom plate 1, a supporting portion 311 of the upper-section adjusting rod 31 abuts against the bottom of the upper-section adjusting rod connecting piece 12, and the upper end of the upper-section adjusting rod 31 is locked into a locking nut 33 to enable the upper-section adjusting rod 31 and the prefabricated pipe gallery bottom plate 1 to be connected into a whole, so that the prefabricated pipe gallery bottom plate 1 is prevented from floating up when the self-dense concrete 5.
Referring to fig. 1 and fig. 2, in this embodiment, preferably, the upper-section adjusting rod connecting member 12 includes an embedded fixing steel plate 121 fixedly connected to the bottom of the installation through hole 11 and a connecting steel plate 122 fixedly connected to the bottom of the embedded fixing steel plate 121 through field assembly, an embedded fixing steel plate through hole 1211 is formed in the embedded fixing steel plate 121, a connecting steel plate through hole 1221 is formed in the connecting steel plate 122, the upper end of the upper-section adjusting rod 31 sequentially passes through the connecting steel plate through hole 1221 and the embedded fixing steel plate through hole 1211 and extends into the installation through hole 11 of the prefabricated pipe gallery bottom plate 1, and the supporting portion 311 of the upper-section adjusting rod 31 abuts against the bottom of the connecting steel plate 122.
Referring to fig. 1 and 2, in the embodiment, preferably, the lock nut 33, the connecting steel plate 122, the upper adjusting rod 31 and the lower connecting rod 32 are assembled and connected in advance, and the pre-buried fixing steel plate 121 and the connecting steel plate 122 are aligned and then fixedly connected together by welding in the field. In the process of installing the prefabricated pipe gallery bottom plate 1, because the prefabricated pipe gallery bottom plate 1 is generally heavier and needs to be installed by hoisting, if the pre-embedded fixed steel plate 121 and the connecting steel plate 122 of the upper-section adjusting rod connecting piece 12 are fixedly connected in advance before the prefabricated pipe gallery bottom plate 1 is installed, the problem of difficult alignment exists no matter the upper-section adjusting rod 31 is firstly connected to the connecting steel plate 122 and then the upper-section adjusting rod 31 is aligned to the lower-section connecting rod 32 for threaded connection, or the upper-section adjusting rod 31 is firstly connected to the lower-section connecting rod 32 for threaded connection and then the connecting steel plate 122 is aligned to the upper-section adjusting rod 31 for connection, the installation efficiency of the prefabricated pipe gallery bottom plate 1 is influenced, and there is a more or less shaking problem during hoisting of the prefabricated pipe gallery floor 1, which may also increase the risk of the adjusting mechanism 3 being knocked into bending deformation. In this embodiment, preferably, the aperture of the connecting steel plate through hole 1221 is matched with the outer diameter of the upper end of the upper adjusting rod 31, and the aperture of the pre-embedded fixing steel plate through hole 1211 is slightly larger than the connecting steel plate through hole 1221. Before the prefabricated pipe gallery bottom plate 1 is installed, the locking nut 33, the connecting steel plate 122, the upper adjusting rod 31 and the lower connecting rod 32 are assembled and connected in advance, when the prefabricated pipe gallery bottom plate 1 is hoisted, only the embedded fixing steel plate 121 fixedly connected to the bottom of the installation through hole 11 of the prefabricated pipe gallery bottom plate 1 needs to be aligned with the corresponding connecting steel plate 122, the aperture of the embedded fixing steel plate through hole 1211 is slightly larger than that of the connecting steel plate through hole 1221, so that in the alignment process of the embedded fixing steel plate 121 and the connecting steel plate 122, certain offset of the embedded fixing steel plate 121 and the connecting steel plate 122 is allowed, the requirements of alignment accuracy of the embedded fixing steel plate 121 and the connecting steel plate 122 are reduced, the assembling efficiency is improved, meanwhile, the adjusting mechanism 3 can not be collided and bent due to slight shaking of the prefabricated pipe gallery bottom plate 1, and the use safety.
Referring to fig. 1 and fig. 2, in the embodiment, preferably, the pre-buried fixing steel plate 121 is provided with a plurality of welding through holes 1212 facilitating welding of the connecting steel plate 122. In this embodiment, accomplish the counterpoint back at pre-buried fixed steel sheet 121 and the connecting steel plate 122 that corresponds, can weld pre-buried fixed steel sheet 121 and connecting steel plate 122 firmly together through each welding through-hole 1212 convenient and fast ground, and then make prefabricated piping lane bottom plate 1 and cushion foundation 2 just link together through adjustment mechanism 3.
Referring to fig. 1 and fig. 2, in the embodiment, preferably, a plurality of embedded steel bars 123 protruding downward are disposed at the peripheral position of the installation through hole 11 of the prefabricated pipe gallery bottom plate 1, and the embedded fixing steel plate 121 is fixedly connected to the bottom position of the installation through hole 11 by being welded to the embedded steel bars 123.
Referring to fig. 1 and 2, in the present embodiment, preferably, the lower connecting rod 32 is a connecting steel bar fixedly connected to the mat foundation 2.
Referring to fig. 1 and 2, in the present embodiment, preferably, the lower ends of the connecting bars are fastened to the mat foundation 2 by an adhesive 4. In this embodiment, the adhesive 4 may be a building bar-planting adhesive.
Referring to fig. 1 and 2, the construction method of the superposed assembly type urban comprehensive underground pipe gallery of the embodiment is as follows:
s1, paying off the cushion foundation 2, marking the positions of a plurality of mounting holes for mounting the lower connecting rods 32, and drilling a plurality of mounting holes matched with the lower connecting rods 32 on the cushion foundation 2 according to the determined positions;
s2, filling the mounting holes of the lower connecting rods 32 on the cushion foundation 2 with the adhesive 4, respectively inserting the lower connecting rods 32 into the mounting holes in an aligning manner, and then placing for a period of time until the adhesive 4 is solidified so that the lower connecting rods 32 are firmly connected with the cushion foundation 2;
s3, assembling and connecting the upper-section adjusting rods 31, the connecting steel plates 122 and the locking nuts 33 in advance, and then respectively connecting the lower ends of the upper-section adjusting rods 31 and the corresponding lower-section connecting rods 32 in the cushion foundation 2 through threads;
s4, rotating the upper section adjusting rods 31 according to the elevation, so that the upper section adjusting rods 31 and the connecting steel plates 122 are uniformly adjusted to a preset height;
s5, hoisting the prefabricated pipe gallery bottom plate 1, aligning each pre-buried fixed steel plate 121 on the bottom of the prefabricated pipe gallery bottom plate 1 to fall on the corresponding connecting steel plate 122, and then finely adjusting the height by rotating each upper section adjusting rod 31 to ensure that the distance between the prefabricated pipe gallery bottom plate 1 and the cushion foundation 2 and the integral levelness of the prefabricated pipe gallery bottom plate 1 meet the requirements;
s6, after the space between the prefabricated pipe gallery bottom plate 1 and the cushion foundation 2 and the overall levelness of the prefabricated pipe gallery bottom plate 1 are inspected to be qualified, welding the pre-buried fixed steel plate 121 and the connecting steel plate 122 firmly;
s7, sequentially installing the prefabricated left side wall board, the prefabricated right side wall board, the prefabricated middle partition board and the prefabricated top board, binding steel bars according to technical specifications, completing the installation of the pipe gallery formwork, and finally pouring the self-sealing concrete 5.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; these modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention, and therefore, all other embodiments obtained by those skilled in the art without any creative effort fall within the protection scope of the present invention.
Claims (9)
1. The utility model provides a coincide assembled city utility tunnel which characterized in that: comprises a prefabricated pipe gallery bottom plate (1) and a cushion layer foundation (2), a plurality of adjusting mechanisms (3) which can support the prefabricated pipe gallery bottom plate (1), adjust the distance between the prefabricated pipe gallery bottom plate (1) and the cushion layer foundation (2) and prevent the prefabricated pipe gallery bottom plate (1) from floating are connected between the prefabricated pipe gallery bottom plate (1) and the cushion layer foundation (2), each adjusting mechanism (3) comprises an upper section adjusting rod (31) and a lower section connecting rod (32), the upper end of the upper section adjusting rod (31) is vertically and movably connected onto the prefabricated pipe gallery bottom plate (1) and can axially rotate relative to the prefabricated pipe gallery bottom plate (1), a supporting part (311) which can be supported at the bottom of the prefabricated pipe gallery bottom plate (1) is formed on the upper section adjusting rod (31), a locking nut (33) is in threaded connection with the upper end of the upper section adjusting rod (31), the upper section adjusting rod (31) can be connected with the prefabricated pipe gallery bottom plate (1) through the mutual matching of the locking nut (33) and the supporting part (, the lower section connecting rod (32) is vertically and fixedly connected to the cushion foundation (2), and the lower end of the upper section adjusting rod (31) is in threaded connection with the lower section connecting rod (32).
2. The folding assembly type urban comprehensive underground pipe gallery according to claim 1, characterized in that: the prefabricated pipe gallery bottom plate has the advantages that the installation through hole (11) is formed in the prefabricated pipe gallery bottom plate (1), the upper section adjusting rod connecting piece (12) is arranged at the bottom of the installation through hole (11), the upper end part of the upper section adjusting rod (31) penetrates the upper section adjusting rod connecting piece (12) and stretches into the installation through hole (11) of the prefabricated pipe gallery bottom plate (1), the supporting part (311) of the upper section adjusting rod (31) abuts against the bottom of the upper section adjusting rod connecting piece (12), the upper section adjusting rod (31) can be connected with the prefabricated pipe gallery bottom plate (1) into a whole through the locking nut (33) locked at the upper end of the upper section adjusting rod (31), and the prefabricated pipe gallery bottom plate (1) is prevented from floating when self-dense concrete is poured.
3. The folding assembly type urban comprehensive underground pipe gallery according to claim 2, characterized in that: the upper segment adjusting rod connecting piece (12) comprises an embedded fixed steel plate (121) fixedly connected to the bottom of the installation through hole (11) and a connecting steel plate (122) fixedly connected to the bottom of the embedded fixed steel plate (121) through field assembly, an embedded fixed steel plate through hole (1211) is formed in the embedded fixed steel plate (121), a connecting steel plate through hole (1221) is formed in the connecting steel plate (122), the upper end of the upper segment adjusting rod (31) sequentially penetrates through the connecting steel plate through hole (1221) and the embedded fixed steel plate through hole (1211) and extends into the installation through hole (11) of the prefabricated pipe gallery bottom plate (1), and the supporting portion (311) of the upper segment adjusting rod (31) abuts against the bottom of the connecting steel plate (122).
4. The folding assembly type urban comprehensive underground pipe gallery according to claim 3, characterized in that: the locking nut (33), the connecting steel plate (122), the upper section adjusting rod (31) and the lower section connecting rod (32) are assembled and connected together in advance, and the pre-buried fixing steel plate 121 and the connecting steel plate 122 are fixedly connected together through field welding after being aligned.
5. The folding assembly type urban comprehensive underground pipe gallery according to claim 4, characterized in that: the aperture of the connecting steel plate through hole (1221) is matched with the outer diameter of the upper end of the upper section adjusting rod (31), and the aperture of the pre-buried fixing steel plate through hole (1211) is slightly larger than the connecting steel plate through hole (1221).
6. The folding assembly type urban comprehensive underground pipe gallery according to claim 5, characterized in that: a plurality of welding through holes (1212) convenient for welding the connecting steel plate (122) are formed in the embedded fixed steel plate (121).
7. The folding assembly type urban comprehensive underground pipe gallery according to claim 3, characterized in that: be equipped with a plurality of pre-buried reinforcing bars (123) that stretch to the protruding downwards on the peripheral position of installation through-hole (11) of prefabricated piping lane bottom plate (1), pre-buried fixed steel sheet (121) are through with pre-buried reinforcing bar (123) welding and fixed connection is on the bottom position of installation through-hole (11).
8. The congruent assembled city utility tunnel of any one of claims 1 to 7, characterized in that: the lower section connecting rod (32) is a connecting steel bar fixedly connected to the cushion foundation (2).
9. The folding assembly type urban comprehensive underground pipe gallery according to claim 8, characterized in that: the lower end of the connecting steel bar is fixedly connected with the cushion foundation (2) through an adhesive (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020350077.2U CN212294739U (en) | 2020-03-19 | 2020-03-19 | Coincide assembled city utility tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020350077.2U CN212294739U (en) | 2020-03-19 | 2020-03-19 | Coincide assembled city utility tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212294739U true CN212294739U (en) | 2021-01-05 |
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ID=73960596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020350077.2U Active CN212294739U (en) | 2020-03-19 | 2020-03-19 | Coincide assembled city utility tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212294739U (en) |
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2020
- 2020-03-19 CN CN202020350077.2U patent/CN212294739U/en active Active
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