CN217378864U - Novel wing plate tubular pile and construction mold - Google Patents
Novel wing plate tubular pile and construction mold Download PDFInfo
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- CN217378864U CN217378864U CN202221364934.XU CN202221364934U CN217378864U CN 217378864 U CN217378864 U CN 217378864U CN 202221364934 U CN202221364934 U CN 202221364934U CN 217378864 U CN217378864 U CN 217378864U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The utility model discloses a novel pterygoid lamina tubular pile and construction mould, pterygoid lamina tubular pile are the cross cover including the pile body and pterygoid lamina, and wherein the pterygoid lamina is established on the pile body, and the pile body forms for prefabricating, and the pterygoid lamina forms for the site pouring. The wing plates are of a steel plate-concrete combined structure, steel plates are assembled inside the wing plates, concrete is poured outside the steel plates, the steel plates inside the wing plates are connected with the pile body, the wing plates are provided with four blocks, the appearance and the size of each wing plate are identical, one pile is symmetrically arranged with four wings, and the included angle of the central axis on the horizontal planes of every two adjacent wing plates is 90 degrees. The construction mould comprises an upper upright column, a lower upright column, a wing plate mould and an inclined strut, wherein the upper upright column is arranged on the upper part of the wing plate mould, the lower upright column is arranged on the lower part of the upper upright column, the upper upright column and the lower upright column are both of hollow structures, and the shape of the wing plate mould corresponds to that of a wing plate on the pile body. Has the advantages that: the cost is lower, and the damage to the pile body is less in the course of transportation, and it is more convenient to transport. The integrity is strong.
Description
Technical Field
The utility model relates to a tubular pile and construction mould, in particular to novel pterygoid lamina tubular pile and construction mould.
Background
At present, the pile foundation which is the most widely applied foundation form with the longest history in deep foundations is often adopted when the foundation is not suitable for soft foundations subjected to foundation treatment, the foundation bears larger eccentric load or horizontal load, and the superstructure is very sensitive to uneven settlement of the foundation. However, with the development of economy, new engineering construction schemes are frequently developed, and higher requirements are made on the bearing capacity of the pile foundation.
For example, in a new energy power generation project "photovoltaic power generation" rapidly developed in recent years, when the agricultural light complementary photovoltaic power generation is adopted, a concrete precast tubular pile is generally adopted as a foundation because the foundation is weak and is not suitable for foundation treatment. The vertical load borne by the wind-driven generator is small, and the load mainly borne by the wind-driven generator is horizontal load and long-term cyclic torsional load caused by wind load. The conventional prefabricated tubular pile for photovoltaic power generation generally adopts a short pile with a smaller pile diameter, so that the horizontal resistance of a foundation soil body is not fully exerted, and the friction between a pile side and the soil body is smaller, so that the horizontal bearing capacity and the torsion resistance can not meet the requirements. If the horizontal bearing capacity and the anti-torsion capacity are improved by increasing the pile length, the vertical bearing capacity of the pile is wasted more. Some existing achievements, such as the forming of a prefabricated wing plate pile directly in a factory, or the forming of a regular concave-convex shape on the side surface of a pile body, and the filling of concrete after the pile is drilled and sunk to fill pores, so as to enhance the horizontal bearing capacity and the anti-torsion capacity of the pile. However, the method changes the production process of the precast pile, increases the production cost, and can construct the upper structure after the concrete is poured and the concrete is solidified, so that the construction period is prolonged to a certain extent. Meanwhile, the wing sheet pile is more inconvenient to transport than a common precast pile, and the pile body is easily damaged in different degrees in the transportation process, so that the final pile forming quality is influenced.
Disclosure of Invention
The utility model aims at solving current precast tubular pile and generally being the less stub in stake footpath, leading to the horizontal resistance performance of foundation soil body insufficient, the frictional force between stake side and the soil body is less to horizontal bearing capacity and antitorque commentaries on classics ability often can not satisfy the problem of requirement, and the novel pterygoid lamina tubular pile and the construction mould that provide.
The utility model provides a novel pterygoid lamina tubular pile is the cross cover including pile body and pterygoid lamina, and wherein the pterygoid lamina is established on the pile body, and the pile body forms for prefabricating, and the pterygoid lamina forms for the site pouring.
The wing plates are of a steel plate-concrete combined structure, steel plates are assembled inside the wing plates, concrete is poured outside the steel plates, the steel plates inside the wing plates are connected with a pile body, the wing plates are provided with four blocks, the appearance and the size of each wing plate are the same, a pile is symmetrically arranged on four wings, the included angle of the central axis on the horizontal plane of every two adjacent wing plates is 90 degrees, non-adjacent wing plates are divided into an upper bearing wing plate group and a lower bearing wing plate group in a pairwise mode, the steel plates in the two wing plates of the upper bearing wing plate group are arranged on the upper portions of the wing plates, the steel plates in the two wing plates of the lower bearing wing plate group are arranged on the lower portions of the wing plates, the upper bearing wing plate group and the steel plates in the lower bearing wing plate group are arranged in a cross mode, and the distance between the lower edge of the steel plate in the upper bearing wing plate group and the upper edge of the steel plate in the lower bearing wing plate group is smaller than 15 mm.
The outer end side of each wing plate is rectangular in the vertical direction, the projection of the wing plate side on the vertical section, namely the middle axial plane of the thickness of the wing plate, is also rectangular, and the ratio of the width of the horizontal direction of the wing plate minus the thickness of the double-fold concrete protective layer to the height of the vertical direction of the wing plate minus the thickness of the double-fold concrete protective layer is 5: 8; the projection of the horizontal section of the wing plate is trapezoidal, the included angle between the waist of the trapezoid and the long bottom edge is 81 degrees, and the width of the outer end of the wing plate is smaller than the width of the connection part of the wing plate and the pile body.
The steel sheet that the wing plate group was born on upper portion and the wing plate group was born to the lower part forms by two deformed steel plates with bolted connection's mode lock, and every deformed steel plate forms by the rolling of monoblock rectangle steel sheet, and rolling shape is: rolling the right middle part of the whole rectangular steel plate into an arc corresponding to the radian of the pile body, wherein the central angle of the cross section of the steel plate at the arc part is 172-176 degrees, and the inner diameter of the steel plate at the arc part is equal to the outer diameter of the pile body; the rectangle steel sheet of arc steel sheet both sides is regarded as the inside atress steel sheet of two corresponding pterygoid laminas respectively, is close to and has offered the connection that the several bolt hole is used for two deformed steel plates on the rectangle steel sheet of pile body both sides, and the ratio of rectangle steel sheet horizontal direction length and vertical direction height is 5: 4, the arc parts of the two special-shaped steel plates and the connection part of the pile body and the special-shaped steel plates are coated with epoxy mortar, the arc parts of the two special-shaped steel plates are symmetrically attached to the pile body, and the two special-shaped steel plates are fastened and connected through bolt holes by bolts to form a steel plate structure inside the wing plate.
The utility model provides a novel construction mould of pterygoid lamina tubular pile is including the upper portion stand, the lower part stand, pterygoid lamina mould and bracing, wherein the upper portion stand is established on pterygoid lamina mould's upper portion, the lower part stand is established in the lower part of upper portion stand, upper portion stand and lower part stand are hollow structure, the shape of pterygoid lamina on pterygoid lamina mould's the shape and the pile body is corresponding, the border at the lower part stand is established to the pterygoid lamina mould circle, the top of bracing is connected with the upper portion stand, the bottom of bracing is connected with the top surface of pterygoid lamina mould, the upper portion stand, lower part stand and pterygoid lamina mould are the monolithic steel construction, be welded connection between bracing and upper portion stand and the pterygoid lamina mould.
The height of the upper upright post is 1.5-2.0 times of that of the wing plate mould, and the top end of the upper upright post is provided with an annular lifting ring.
The height of the lower upright column is the same as that of the wing plate mould, the cross section of the bottom of the lower upright column is gradually reduced, the bottom of the lower upright column is provided with a pile tip with an inverted frustum, the height of the pile tip is 150-250 mm, and the outer diameter of the bottom surface of the pile tip is 70-80 mm smaller than that of the pile body.
The height of the wing plate mould is half of the height of the wing plate, the full width of the bottom of the wing plate mould is provided with a blade foot, and the height of the far pile end of the blade foot is smaller than that of the near pile end.
The utility model discloses a work progress as follows:
step one, forming a groove by a wing plate groove: vertically driving a construction mould into a soil body by using a pile driver at a pile sinking position, adding 0.2 times of pile diameter to the wing plate mould with the depth being two times, fixing a hook at a lifting ring at the top end of an upper upright post after the soil body is stabilized, slowly and vertically pulling out the construction mould, and paving a layer of waterproof material in a wing plate groove;
step two, preliminary pile sinking: the pile body is lifted to the slotted hole and is lowered, and after the position is calibrated, the pile body is sunk to a set depth, so that the part to be installed of the steel plate in the wing plate is positioned at a height convenient for assembly;
step three, assembling the steel plates in the wing plates: firstly, assembling steel plates in the lower bearing wing plate group, brushing a layer of epoxy mortar on the arc parts of two special-shaped steel plates and the pile body part connected with the special-shaped steel plates, symmetrically attaching the arc parts of the two special-shaped steel plates to the pile body, and finally fastening the two special-shaped steel plates by bolts to form the steel plates in the lower bearing wing plate group; after the assembly of the steel plates in the lower bearing wing plate group is finished, the steel plates in the upper bearing wing plate group are assembled above the lower bearing wing plate group, the upper steel plates are vertical to the lower steel plates in the horizontal direction, the distance between the lower edges of the upper steel plates and the upper edges of the lower steel plates is required to be less than 15mm, and the assembly operation is consistent with the assembly operation of the lower steel plates;
step four, pile sinking of the wing plate pile: after the steel plates in the wing plates are assembled, the wing plate piles are driven to the position, 0.2D (D is the outer diameter of the pile body), away from the ground, of the upper edge of the upper wing plate steel plate by using a pile driver;
and fifthly, pouring concrete, and filling the wing plate groove.
The utility model has the advantages that:
the utility model provides a novel pterygoid lamina tubular pile directly uses the precast concrete tubular pile of current ordinary specification to make, and more general precast pterygoid lamina stake does not change precast pile production technology, and the cost is lower, and transport on the way to the pile body damage littleer, and it is more convenient to transport. The utility model provides a construction mould can be crowded densely with the soil body of pile body border, makes the soil body more closely knit, improves the shear strength and the bearing capacity of the soil body.
The four wing plates of the novel wing plate pile can exert the resistance of the foundation soil body to a greater extent, and the horizontal bearing capacity and the torsion resistance of the pile are enhanced; epoxy mortar is used for cementing between the wing plate and the pile body, the steel plate in the wing plate is tightly buckled with the pile body through bolt connection, and meanwhile, concrete is used for pouring, so that the integrity is strong.
The utility model provides a novel wing sheet pile is crowded soil pile in essence, and when the concrete did not solidify, the crowded soil part in pile body lower part can provide the bearing capacity of enough superstructure construction.
Drawings
Fig. 1 is the overall structure schematic diagram of the novel wing plate tubular pile.
Fig. 2 is the novel profile structure schematic diagram is looked to pterygoid lamina tubular pile left side.
Fig. 3 is a schematic view of a right-side section structure of a novel wing plate tubular pile.
Fig. 4 is a schematic view of the connection structure between the inner steel plate and the pile body of the wing plate of the present invention.
Fig. 5 is a top view of the connection structure between the inner steel plate and the pile body of the wing plate of the present invention.
Fig. 6 is a top view of a single-sided structure of a steel plate in a wing plate according to the present invention.
Fig. 7 is the overall structure schematic diagram of the construction mold of the novel wing plate tubular pile.
The labels in the above figures are as follows:
1. pile body 2, wing plate 3, steel plate 4, concrete 5, bolt hole 6 and bolt
7. Upper upright column 8, lower upright column 9, wing plate mould 10, inclined strut 11 and lifting ring
12. Pile toe 13 and cutting edge.
Detailed Description
Please refer to fig. 1 to 7:
the utility model provides a novel pterygoid lamina tubular pile is including pile body 1 and pterygoid lamina 2, and wherein pterygoid lamina 2 is the cross cover and establishes on pile body 1, and pile body 1 forms for prefabricating, and pterygoid lamina 2 forms for the site pouring.
The wing plates 2 are of a steel plate 3-concrete 4 combined structure, the steel plates 3 are assembled in the wing plates 2, concrete 4 is poured outside the steel plates 3, the steel plates 3 in the wing plates 2 are connected with the pile body 1, the wing plates 2 are provided with four pieces, the appearance and the size of each wing plate 2 are the same, one pile is symmetrically arranged with four wings, the included angle of the central axis on the horizontal plane of each two adjacent wing plates 2 is 90 degrees, the non-adjacent wing plates 2 are divided into an upper bearing wing plate group and a lower bearing wing plate group, the steel plates 3 in the two wing plates 2 of the upper bearing wing plate group are arranged on the upper part of the wing plates 2, the steel plates 3 in the two wing plates 2 of the lower bearing wing plate group are arranged on the lower part of the wing plates 2, and the steel plates 3 in the upper bearing wing plate group and the lower bearing wing plate group are arranged in a cross shape relatively, and the distance between the lower edge of the steel plate 3 in the upper bearing wing plate group and the upper edge of the steel plate 3 in the lower bearing wing plate group is less than 15 mm.
The outer end side of each wing plate 2 is rectangular in the vertical direction, the projection of the side of each wing plate 2 on the vertical section, namely the middle axial plane of the thickness of the wing plate 2 is also rectangular, and the ratio of the width of the wing plate 2 in the horizontal direction minus the thickness of the two-fold concrete 4 protective layer to the height of the wing plate 2 in the vertical direction minus the thickness of the two-fold concrete 4 protective layer is 5: 8; the projection of the horizontal section of the wing plate 2 is trapezoidal, the included angle between the waist of the trapezoid and the long bottom edge is 81 degrees, and the width of the outer end of the wing plate 2 is smaller than the width of the joint of the wing plate 2 and the pile body 1.
The steel sheet 3 that the wing plate group was born on upper portion and the wing plate group was born to the lower part forms with the mode lock of bolt 6 connection by two deformed steel plates, and every deformed steel plate forms by the rolling of monoblock rectangle steel sheet, and rolling shape is: rolling the right middle part of the whole rectangular steel plate into an arc corresponding to the radian of the pile body 1, wherein the central angle of the cross section of the steel plate 3 at the arc part is 172-176 degrees, and the inner diameter of the steel plate 3 at the arc part is equal to the outer diameter of the pile body 1; the rectangle steel sheet of arc steel sheet both sides is regarded as the inside atress steel sheet 3 of two corresponding pterygoid laminas respectively, has seted up the connection that several bolt hole 5 is used for two special-shaped steel boards on being close to the rectangle steel sheet of 1 both sides of pile body, and rectangle steel sheet horizontal direction length is 5 with the ratio of vertical direction height: 4, the arc parts of the two special-shaped steel plates and the connection part of the pile body 1 and the special-shaped steel plates are coated with epoxy mortar, the arc parts of the two special-shaped steel plates are symmetrically attached to the pile body 1, and the two special-shaped steel plates are fastened and connected through bolt holes 5 by bolts 6 to form a steel plate 3 structure inside the wing plate 2.
The utility model provides a novel construction mould of pterygoid lamina tubular pile is including upper portion stand 7, lower part stand 8, pterygoid lamina mould 9 and bracing 10, wherein upper portion stand 7 is established on the upper portion of pterygoid lamina mould 9, lower part stand 8 is established in the lower part of upper portion stand 7, upper portion stand 7 and lower part stand 8 are hollow structure, pterygoid lamina 2's shape is corresponding on pterygoid lamina mould 9's the shape and pile body 1, the border at lower part stand 8 is established to pterygoid lamina mould 9 circle, the top of bracing 10 is connected with upper portion stand 7, the bottom of bracing 10 is connected with pterygoid lamina mould 9's top surface, upper portion stand 7, lower part stand 8 and pterygoid lamina mould 9 are the monolithic steel construction, be welded connection between bracing 10 and upper portion stand 7 and the pterygoid lamina mould 9.
The height of the upper upright post 7 is 1.5 to 2.0 times of the height of the wing plate mould 9, and the top end of the upper upright post 7 is provided with an annular lifting ring 11.
The height of the lower upright column 8 is the same as that of the wing plate mould 9, the cross section of the bottom of the lower upright column 8 is gradually reduced, the bottom of the lower upright column 8 is provided with a pile tip 12 with an inverted frustum, the height of the pile tip 12 is 150mm-250mm, and the outer diameter of the bottom surface of the pile tip 12 is smaller than the outer diameter of the pile body 1 by 70mm-80 mm.
The height of the wing plate mould 9 is half of the height of the wing plate 2, a cutting edge 13 is arranged on the full width of the bottom of the wing plate mould 9, and the height of the pile end far away from the cutting edge 13 is smaller than that of the pile end near the cutting edge.
The utility model discloses a work progress as follows:
step one, forming a groove in a wing plate groove: vertically driving a construction mould into a soil body by using a pile driver at a pile sinking position, adding 0.2 times of pile diameter to the wing plate mould 9 with the depth being two times, fixing a hook at a hoisting ring 11 at the top end of an upper upright post 7 after the soil body is stabilized, slowly and vertically pulling out the construction mould, and paving a layer of waterproof material in a wing plate groove;
step two, preliminary pile sinking: the pile body 1 is lifted to the slotted hole and is lowered, and the pile body 1 is sunk to a set depth after the position is calibrated, so that the part to be installed of the steel plate 3 in the wing plate 2 is positioned at a height convenient for assembly;
step three, assembling the steel plate 3 in the wing plate 2: firstly assembling the steel plate 3 in the lower bearing wing plate group, brushing a layer of epoxy mortar on the arc parts of the two special-shaped steel plates and the pile body 1 connected with the special-shaped steel plates, symmetrically attaching the arc parts of the two special-shaped steel plates to the pile body 1, and finally fastening the two special-shaped steel plates by using bolts 6 to form the steel plate 3 in the lower bearing wing plate group; after the lower bearing wing plate group internal steel plate 3 is assembled, the upper bearing wing plate group internal steel plate 3 is assembled above the lower bearing wing plate group internal steel plate 3, the upper steel plate 3 is vertical to the lower steel plate 3 in the horizontal direction, the distance between the lower edge of the upper steel plate 3 and the upper edge of the lower steel plate 3 is required to be less than 15mm, and the assembling operation is consistent with the assembling operation of the lower steel plate 3;
step four, pile sinking of the wing plate pile: after the steel plates 3 in the wing plates 2 are assembled, the wing plate piles are driven to the positions, 0.2D (D is the outer diameter of the pile body), away from the ground, of the upper edges of the steel plates 3 of the upper wing plates 2 by using a pile driver;
and step five, pouring concrete 4, and filling the wing plate groove.
Claims (7)
1. The utility model provides a novel pterygoid lamina tubular pile, including pile body and pterygoid lamina, wherein the pterygoid lamina is the cross cover and establishes on the pile body, and the pile body forms for prefabricating, and the pterygoid lamina forms its characterized in that for cast in situ: the wing plate is of a steel plate-concrete combined structure, a steel plate is assembled inside the wing plate, concrete is poured outside the steel plate, the steel plate inside the wing plate is connected with a pile body, the wing plate is provided with four pieces, the appearance and the size of each wing plate are the same, a pile is symmetrically arranged on four wings, the included angle of the central axis on the horizontal planes of the two adjacent wing plates is 90 degrees, the two non-adjacent wing plates are in one group and are divided into an upper bearing wing plate group and a lower bearing wing plate group, the steel plates in the two wing plates of the upper bearing wing plate group are arranged on the upper portion of the wing plate, the steel plates in the two wing plates of the lower bearing wing plate group are arranged on the lower portion of the wing plate, the upper bearing wing plate group and the lower bearing wing plate group are arranged in a cross shape, and the distance between the lower edge of the steel plate in the upper bearing wing plate group and the upper edge of the steel plate in the lower bearing wing plate group is smaller than 15 mm.
2. The novel wing plate pipe pile of claim 1, characterized in that: the lateral surface of the outer end of each wing plate is rectangular in the vertical direction, the projection of the lateral surface of each wing plate on the vertical section, namely the middle axial surface of the thickness of each wing plate, is also rectangular, and the ratio of the thickness of the concrete protective layer subtracted by twice from the width of the horizontal direction of each wing plate to the thickness of the concrete protective layer subtracted by twice from the height of the vertical direction of each wing plate is 5: 8; the projection of the horizontal section of the wing plate is trapezoidal, the included angle between the waist of the trapezoid and the long bottom edge is 81 degrees, and the width of the outer end of the wing plate is smaller than the width of the connection part of the wing plate and the pile body.
3. The novel wing plate pipe pile of claim 1, characterized in that: the upper portion bear the weight of the pterygoid lamina group and bear the weight of the steel sheet in the pterygoid lamina group by two deformed steel plates with bolted connection's mode lock and form, every deformed steel plate is formed by the rolling of monoblock rectangle steel sheet, the rolling shape is: rolling the right middle part of the whole rectangular steel plate into an arc corresponding to the radian of the pile body, wherein the central angle of the cross section of the steel plate at the arc part is 172-176 degrees, and the inner diameter of the steel plate at the arc part is equal to the outer diameter of the pile body; the rectangle steel sheet of arc steel sheet both sides is regarded as the inside atress steel sheet of two corresponding pterygoid laminas respectively, is close to and has offered the connection that the several bolt hole is used for two deformed steel plates on the rectangle steel sheet of pile body both sides, and the ratio of rectangle steel sheet horizontal direction length and vertical direction height is 5: 4, the arc parts of the two special-shaped steel plates and the connection part of the pile body and the special-shaped steel plates are coated with epoxy mortar, the arc parts of the two special-shaped steel plates are symmetrically attached to the pile body, and the two special-shaped steel plates are fastened and connected through bolt holes by bolts to form a steel plate structure inside the wing plate.
4. The utility model provides a novel construction mould of pterygoid lamina tubular pile which characterized in that: including the upper portion stand, the lower part stand, pterygoid lamina mould and bracing, wherein the upper portion stand is established on the upper portion of pterygoid lamina mould, the lower part stand is established in the lower part of upper portion stand, upper portion stand and lower part stand are hollow structure, the shape of pterygoid lamina mould is corresponding with the shape of pterygoid lamina on the pile body, the periphery at the lower part stand is established to the pterygoid lamina mould circle, the top and the upper portion stand of bracing are connected, the bottom of bracing is connected with the top surface of pterygoid lamina mould, the upper portion stand, lower part stand and pterygoid lamina mould are the integral casting steel construction, be welded connection between bracing and upper portion stand and the pterygoid lamina mould.
5. The construction mold of the novel wing plate pipe pile according to claim 4, characterized in that: the height of the upper upright column is 1.5-2.0 times of that of the wing plate mould, and the top end of the upper upright column is provided with an annular lifting ring.
6. The construction mold of the novel wing plate pipe pile according to claim 4, characterized in that: the height of the lower upright column is the same as that of the wing plate die, the cross section of the bottom of the lower upright column is gradually reduced, the bottom of the lower upright column is provided with a pile tip with an inverted frustum, the height of the pile tip is 150mm-250mm, and the outer diameter of the bottom surface of the pile tip is 70mm-80mm smaller than the outer diameter of the pile body.
7. The construction mould of novel pterygoid lamina tubular pile of claim 4, its characterized in that: the height of the wing plate mould is half of the height of the wing plate, the full width of the bottom of the wing plate mould is provided with a cutting edge, and the height of the pile end far away from the cutting edge is smaller than that of the pile end near the cutting edge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221364934.XU CN217378864U (en) | 2022-06-02 | 2022-06-02 | Novel wing plate tubular pile and construction mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221364934.XU CN217378864U (en) | 2022-06-02 | 2022-06-02 | Novel wing plate tubular pile and construction mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217378864U true CN217378864U (en) | 2022-09-06 |
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ID=83089058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221364934.XU Active CN217378864U (en) | 2022-06-02 | 2022-06-02 | Novel wing plate tubular pile and construction mold |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217378864U (en) |
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2022
- 2022-06-02 CN CN202221364934.XU patent/CN217378864U/en active Active
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