CN111576734A - Secondary-support-free high formwork overlapping construction method for large-section concrete beam - Google Patents
Secondary-support-free high formwork overlapping construction method for large-section concrete beam Download PDFInfo
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- CN111576734A CN111576734A CN202010362107.6A CN202010362107A CN111576734A CN 111576734 A CN111576734 A CN 111576734A CN 202010362107 A CN202010362107 A CN 202010362107A CN 111576734 A CN111576734 A CN 111576734A
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- 238000009415 formwork Methods 0.000 title claims abstract description 65
- 238000010276 construction Methods 0.000 title claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 88
- 239000010959 steel Substances 0.000 claims abstract description 88
- 230000003014 reinforcing Effects 0.000 claims description 14
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000007796 conventional method Methods 0.000 abstract description 3
- 238000005266 casting Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- 230000037250 Clearance Effects 0.000 description 2
- 241000681094 Zingel asper Species 0.000 description 2
- 230000035512 clearance Effects 0.000 description 2
- 230000002708 enhancing Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
- E04G13/04—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for lintels, beams, or transoms to be encased separately; Special tying or clamping means therefor
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
Abstract
A high formwork overlapping construction method for a large-section concrete beam without secondary support includes the steps of arranging a height-adjustable support at the top end of each steel pipe of a lattice type steel pipe column, supporting a Bailey beam on the lattice type steel pipe column to form a formwork system, arranging a distribution beam on the top surface of the Bailey beam after the formwork system is erected, directly laying a large-section concrete beam formwork on the distribution beam, adjusting the height of the height-adjustable support to enable the large-section concrete beam formwork to reach a preset height, utilizing the large-section concrete beam formwork to perform overlapping pouring on the large-section concrete beam three times through a layering overlapping method, descending the Bailey beam through the height-adjustable support after the large-section concrete beam is poured and the strength meets an acceptance standard, forming a formwork dismantling space, and dismantling a space formwork through the formwork, so that the requirement of erecting a secondary support for a steel pipe scaffold required by a conventional method is eliminated, the dosage of the Bailey beam is reduced under the condition of meeting the requirement of bearing capacity, and the investment of the formwork support can be reduced.
Description
Technical Field
The invention relates to a secondary-support-free high formwork overlapping construction method for a large-section concrete beam.
Background
In the construction process of the large-section concrete beam and the concrete bridge, the concrete pouring mainly adopts a formwork supporting mode such as a steel pipe scaffold, a Bailey truss and the like. The steel pipe scaffold has the advantages of convenience in erection and simplicity in disassembly and assembly, but compared with a bailey truss formwork erecting mode, the steel pipe scaffold is low in bearing capacity generally, limited in erection height, and particularly has the advantage of crossing construction by adopting the bailey truss formwork in road and river channel crossing construction. At present, a certain space height is needed for facilitating the detachment of the formwork after the concrete reaches the strength by adopting the bailey truss formwork, so that a steel pipe scaffold with a certain height and a jacking is generally erected at the upper part of the bailey beam to serve as a secondary support in the existing construction process, and the formwork is detached by descending the jacking of the scaffold. However, the process of building the secondary support scaffold is complex, the scaffold also needs to meet the requirements of bearing capacity and stability, the construction difficulty is increased, and the resource investment is increased. The problem that need solve at present reaches the requirement of demolising the template space through the regulation of bailey frame self, removes the erection of scaffold frame secondary support from.
Aiming at the calculation of the formwork support of the large-section beam concrete, if the formwork support is designed according to one-time pouring of the concrete, the number of the formwork support required to be input for meeting the bearing capacity requirement is very large, the arrangement intervals of the formwork support are very small, the operation space requirement of implementation is often difficult to meet, and the implementation efficiency is influenced. Therefore, how to carry out superposition design and construction of the large-section concrete beam and the Bailey truss is a technical problem to be solved.
Disclosure of Invention
The invention provides a steel tube lattice column free of scaffold secondary support and a Bailey beam high formwork system, and provides a large-section concrete beam secondary support-free high formwork overlapping construction method, which aims at the defects of the prior art, adopts layered overlapping for overlarge one-time pouring load of large-section concrete, and utilizes the common stress bearing of poured concrete and a Bailey beam formwork.
In order to solve the technical problems, the invention provides a high formwork overlapping construction method of a large-section concrete beam without secondary support, which comprises the steps of arranging a height-adjustable support piece at the top end of each steel pipe of a lattice type steel pipe column, fixing a cover beam which is arranged in the direction vertical to the large-section concrete beam on the adjacent height-adjustable support piece, supporting a Bailey beam on the lattice type steel pipe column through the cover beam to form a formwork system, arranging a distribution beam on the top surface of the Bailey beam after the formwork system is erected, directly laying a large-section concrete beam template on the distribution beam, adjusting the height of the height-adjustable support piece to enable the large-section concrete beam template to reach a preset height, overlapping and pouring the large-section concrete beam by utilizing a large-section concrete beam template through a layering overlapping and pouring method for three times, after the large-section concrete beam is finished and the strength meets the acceptance standard, descending the Bailey beam through the height-adjustable support, and forming a template removing space, and removing the template through the template removing space.
In the embodiment, the height-adjustable supporting piece comprises a guiding supporting component, a plug pin component and a wedge-shaped stopper iron, the guiding supporting component is a pipe body with a hollow middle part and a section matched with the section of the lattice type steel pipe column, the guiding supporting component is fixedly connected with the lower lattice type steel pipe column through a flange plate, a reinforcing plate matched with the guiding supporting component in height is welded in the guiding supporting component along the direction of a central axial plane,
the bolt part comprises two channel steels, a supporting top plate and a wedge-shaped stopper, wherein the bottom surface of the supporting top plate is fixed with the two channel steels arranged in parallel, a space and a space are arranged between the two channel steels and matched with the thickness of a reinforcing plate, the bolt part is inserted into the reinforcing plate of the guiding supporting part through the gap between the channel steels, the width of the wedge-shaped stopper is matched with the space between the channel steels, and the height of the wedge-shaped stopper is matched with the height of a support piece needing to be supported, wherein the wedge-shaped stopper is inserted between the two channel steels, the upper side and the lower side of the wedge-shaped stopper are supported between the supporting top plate and the reinforcing plate, and a cover beam vertically arranged in the direction of the large.
In this embodiment, a steel plate is fixed below the supporting top plate in the gap between adjacent channel steels as a force transmission plate, and a stiffening plate for reinforcing the bearing capacity of the supporting top plate is fixed between the bottom of the supporting top plate and the channel steels.
In this embodiment, a channel steel for lateral support is further fixed between the capping beam and the supporting top plate.
In the present embodiment, the lattice type steel pipe column includes a steel pipe and lattice column cross braces provided on side surfaces of the steel pipe to connect and support the steel pipe.
In this embodiment, the bery beam is placed on the capping beam and fixed thereto by the channel steel gantry.
In this embodiment, the large-section concrete beam is cast in a superimposed manner three times, and the concrete casting method includes firstly, before casting the first layer of concrete, laying two reinforcing steel bars with lengths matched with the lengths of the first layer of concrete on the top surface of the first layer of concrete along the direction of the large-section concrete beam, casting the first layer of concrete, vertically inserting shear-resistant reinforcing steel bars with uniform intervals on the top surface of the first layer of concrete after initial setting and before final setting of the concrete, and after the first layer of concrete reaches a preset strength, sequentially casting the second layer of concrete and the third layer of concrete on the top surface of the first layer of concrete according to the above manner. By adopting the mode, the common action of the Bailey beam and the poured first layer of concrete is utilized to bear the load of the second layer of concrete. After the second layer of concrete reaches a certain strength, the support system and the poured two layers of concrete bear the load of the third layer of concrete together. Compared with one-time pouring, the required dosage of the Bailey beam can be greatly reduced, the influence of cracks caused by hydration heat of the large-volume concrete beam after one-time pouring can be reduced, and the pouring quality is improved.
The invention has the beneficial effects that:
(1) by adopting the formwork system of the lattice type steel pipe column and the Bailey beam, the bearing capacity requirement of the large-section and large-span concrete beam formwork support is met. Through setting up height-adjustable support piece, reduce and set up the secondary and support the demand. The construction method has the advantages of convenience in construction, reduction in resource investment and cost saving.
(2) The method has the advantages of reducing the using amount of the formwork support, saving resources and reducing investment, and has value of popularization and application for the high formwork of the large-section concrete beam.
In conclusion, the descending function of the upper Bailey beam is realized through the telescopic performance of the height-adjustable support piece, the space height for dismantling the concrete beam template is met, and the requirement that a steel pipe scaffold is not required to be erected with a secondary support in the conventional method is met; the large-section concrete beam is superposed and poured for three times, the poured concrete beam and the Bailey beam are stressed together to bear the subsequently applied load, the dosage of the Bailey beam is reduced under the condition of meeting the bearing capacity requirement, and the investment of a formwork support can be reduced.
Drawings
FIG. 1 is a three-dimensional schematic view of the large-section concrete high formwork superposition construction of the present invention;
FIG. 2 is an elevation view of the high formwork structure of the present invention;
FIG. 3(a) is a schematic structural view of the height adjustable support of the present invention;
FIG. 3(b) is a perspective view of a guide support member of the present invention;
FIG. 3(c) is a perspective view of the latch member of the present invention;
FIG. 4(a) is a front view of a Bailey beam of the present invention;
fig. 4(b) is a left side view of the beret beam of the present invention;
FIG. 5(a) is a front view of a cap beam fixation node of the present invention;
FIG. 5(b) is a left side view of the cap beam fixation joint of the present invention;
fig. 6(a) is a schematic structural view of a fixed node of a beret beam according to the present invention;
FIG. 6(b) is a schematic structural diagram of a channel steel gantry of the present invention;
FIG. 7 is a schematic view of a connecting pin according to the present invention;
FIG. 8 is a schematic view of the laminated beam of the present invention showing crack and shear delamination;
in the figure, 1, a lattice type steel pipe column, 2, a Bailey beam, 3, a height adjustable supporting piece, 4, a cross brace, 5, a cover beam, 6, a connecting pin shaft, 7, a connecting flower shelf, 8, a distribution beam, 9 a large-section concrete beam template, 10, a first layer of the concrete beam, 11, a second layer of the concrete beam, 12, a third layer of the concrete beam, 13, shear steel bars, 14, anti-cracking steel bars, 15, a supporting component, 16, a bolt component, 17, wedge-shaped plug irons, 18, a reinforcing plate, 19, a semi-arc-shaped spliced cover plate, 20 and double-channel steel; 21. supporting a top plate; 22. a force transmission plate; 23. a stiffening plate; 24. supporting channel steel; 25. a channel steel gantry.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
Example (b):
a secondary-support-free high formwork overlapping construction method for a large-section concrete beam comprises the following specific implementation method:
as shown in fig. 1 to 8, a height-adjustable support 3 is arranged at the top end of each steel pipe of a lattice type steel pipe column 1, a cover beam 5 arranged perpendicular to the direction of a large-section concrete beam is fixed on the adjacent height-adjustable support 3, a bailey beam 2 is supported on the lattice type steel pipe column through the cover beam 5 to form a formwork system, a distribution beam 8 is arranged on the top surface of the bailey beam 2 after the formwork system is erected, a large-section concrete beam template 9 is directly paved on the distribution beam 8, the height of the height-adjustable support 3 is adjusted to enable the large-section concrete beam template 9 to reach a preset height, the large-section concrete beam template 9 is used for carrying out superposition casting on the large-section concrete beam three times through a layering superposition casting method, the large-section concrete beam is cast and the strength meets an acceptance standard, the bailey beam is descended through the height-adjustable support to form a template dismantling space, and removing the space through the template.
The specific construction method in this embodiment is described below:
see fig. 1, fig. 2, fig. 4(a), fig. 4(b), fig. 5(a), fig. 5(b), fig. 6(a), fig. 6(b), fig. 7; the lattice type steel pipe column 1 is composed of 4 steel pipes phi 609x16mm, the cross section size of the lattice type steel pipe column 1 is 4.5m x 4.5m, adjacent steel pipes are fixedly connected through lattice type column cross braces 4, the lattice type column cross braces 4 are made of channel steel, and the top end of each steel pipe of the lattice type steel pipe column 1 is provided with a height-adjustable support 3. And a bent cap 5 is arranged on the top plate of the adjacent height-adjustable support 3 and is vertical to the beam direction, the bent cap 5 is formed by I-shaped steel, and the bent cap 5 and the top plate are welded and fixed and laterally supported by adopting channel steel 24. The Bailey beams 2 are placed on the bent cap, the distance between the Bailey beams 2 is 450mm and 900mm, the adjacent Bailey beams 2 are transversely connected into a whole through angle steel flower stands 7, and are longitudinally assembled into the required span through connecting pin shafts 6. The number of the Bailey beams is determined according to the span size and the beam section load size, and the requirements of deformation and bearing capacity are met. The connection between the Bailey beam and the bent cap is fixed through the channel steel gantry 25, and the Bailey beam is ensured to transfer force to the bent cap 5 through the node rod piece.
See fig. 2, fig. 3. In this embodiment, the height-adjustable supporting member 3 is 250mm in the telescopic amount. The height adjustable support 3 comprises a guide support member 15, a latch member 16 and a wedge-shaped stopper 17. The guide supporting component 15 is a hollow pipe, the section of the guide supporting component 15 is consistent with that of the lattice type steel pipe column 1 by phi 609x16mm and the height is 1m, and the guide supporting component 15 is connected with the lattice type steel pipe column 1 through a flange. The tangent plane direction of leading the support component 15 inside edge crossing the central line sets up one and leads the support component 15 high assorted, the reinforcing plate 18 that 40mm is thick, and the top of leading the support component 15 sets up half-circular arc apron 19, is equipped with the interval between half-circular arc apron 19 and the reinforcing plate 18, the interval forms the slot and is used for being connected with bolt part 16.
The bolt part 16 comprises a supporting top plate 21, two channel steels 20 with the length of 1.25m and a wedge-shaped stopper 17, a gap which is 41mm and is matched with the thickness of the reinforcing plate 18 is reserved between the two channel steels 20, the size of the channel steels 20 is matched with the size of the slot, and a steel plate which is 40mm thick and is 650x650mm is welded at the upper ends of the two channel steels 20 to serve as the supporting top plate 21. A steel plate with the thickness of 40mm and the height of 350mm is arranged below the supporting top plate 21 and between the gaps of the two channel steels and serves as a force transmission plate 22, and a stiffening plate 23 is welded to the bottom of the supporting top plate 21 and the channel steels. The clearance size phase-match between wedge-shaped chock 17 and the channel-section steel 20, during the implementation, according to the height that needs the adjustment, select wedge-shaped chock 17 of a take the altitude, insert the wedge-shaped chock in the channel-section steel clearance, through selecting to insert wedge-shaped chock 17 of co-altitude not to the height of roof 21 is adjusted, in this embodiment, it is 0 ~ 250mm to inject adjustable height range.
See FIGS. 1-3. After the formwork system is erected, a distribution beam 8 is arranged on the top surface of the Bailey beam to directly lay a large-section concrete beam formwork 9, and the requirement of space height for dismantling the formwork after the concrete reaches the strength is met through the telescopic function of the lattice type steel pipe column height-adjustable supporting piece 3, so that the requirement that a steel pipe scaffold with a jacking is required to be arranged for secondary supporting in a conventional method is eliminated. After the concrete beam reaches the strength, the wedge-shaped stopper 17 is slowly hammered and slid out, the bolt part 16 of the height-adjustable support part 3 is lowered by taking out the wedge-shaped stopper 17, and the cover beam 5 and the Bailey beam 2 are synchronously lowered to form the formwork removing space height, so that the formwork can be separated from the poured concrete surface, and the formwork removing process is completed.
See fig. 1, fig. 8. The large-section concrete beam is subjected to superposition casting for three times, the superposition position is determined by analysis and calculation during the design of the superposition casting, and two anti-crack reinforcing steel bars 14 with the diameter consistent with the beam top direction are added on the top surface of the layered surface to enhance the crack resistance of the superposition surface. Meanwhile, after the initial setting of the concrete, the shear steel bars 13 with the spacing of 300mm are inserted before the final setting to enhance the shear resistance of the superposed surface, the diameter of the steel bars is 14mm, and the insertion depth and the reserved length are 250 mm. And after the formwork support and the formwork are installed, pouring the first layer of concrete 10, and after the first layer of concrete reaches a certain strength, bearing the load of the second layer of concrete 11 by utilizing the combined action of the poured first layer of concrete and the formwork support. After the second layer of concrete is poured and reaches a certain strength, the load of the third layer of concrete 12 is borne by the combined action of the two layers of concrete which are already poured and the formwork support. The bearing capacity of the formwork support is designed by the superposition method, so that the using amount of the formwork support is determined, and the purpose of reducing the using amount of the Bailey beam 2 required by pouring the large-section beam at one time is achieved.
While the preferred embodiments of the present invention have been illustrated and described, the present invention is not limited to the specific embodiments described above, and various modifications can be made by those skilled in the art without departing from the technical idea of the present invention claimed in the claims.
Claims (7)
1. A secondary-support-free high formwork overlapping construction method for a large-section concrete beam is characterized by comprising the following steps of: the method comprises the steps that a height-adjustable support piece is arranged at the top end of each steel pipe of the lattice type steel pipe column, a cover beam which is arranged in a direction perpendicular to the direction of a large-section concrete beam is fixed on the adjacent height-adjustable support piece, a Bailey beam is supported on the lattice type steel pipe column through the cover beam to form a formwork supporting system, a distribution beam is arranged on the top surface of the Bailey beam after the formwork supporting system is erected, a large-section concrete beam formwork is directly paved on the distribution beam, the height of the height-adjustable support piece is adjusted, the large-section concrete beam formwork reaches a preset height, the large-section concrete beam formwork is overlapped and poured for three times through a layering and overlapping method, after the large-section concrete beam is poured and the strength meets an acceptance standard, the Bailey beam is descended through the height-adjustable support piece to form a formwork dismantling space, and the formwork.
2. The secondary-support-free high formwork overlapping construction method for the large-section concrete beam according to claim 1, characterized in that: the height-adjustable supporting piece comprises a guiding supporting component, a plug pin component and a wedge-shaped stopper iron, the guiding supporting component is a pipe body with a hollow middle part and a section matched with the section of the lattice type steel pipe column, the guiding supporting component is fixedly connected with the lower lattice type steel pipe column through a flange plate, a reinforcing plate matched with the guiding supporting component in height is welded in the guiding supporting component along the direction of a central axial plane,
the bolt part comprises two channel steels, a supporting top plate and a wedge-shaped stopper, wherein the bottom surface of the supporting top plate is fixed with the two channel steels arranged in parallel, a space and a space are arranged between the two channel steels and matched with the thickness of a reinforcing plate, the bolt part is inserted into the reinforcing plate of the guiding supporting part through the gap between the channel steels, the width of the wedge-shaped stopper is matched with the space between the channel steels, and the height of the wedge-shaped stopper is matched with the height of a support piece needing to be supported, wherein the wedge-shaped stopper is inserted between the two channel steels, the upper side and the lower side of the wedge-shaped stopper are supported between the supporting top plate and the reinforcing plate, and a cover beam vertically arranged in the direction of the large.
3. The secondary-support-free high formwork overlapping construction method for the large-section concrete beam according to claim 2, characterized in that: and a steel plate serving as a force transmission plate is fixed below the supporting top plate in a gap between adjacent channel steels, and a stiffening plate for reinforcing the bearing capacity of the supporting top plate is fixed between the bottom of the supporting top plate and the channel steels.
4. The secondary-support-free high formwork overlapping construction method for the large-section concrete beam according to claim 3, characterized in that: and a channel steel for lateral supporting is fixed between the cover beam and the supporting top plate.
5. The secondary-support-free high formwork overlapping construction method for the large-section concrete beam according to claim 1, characterized in that: the lattice type steel pipe column comprises a steel pipe and lattice column cross braces which are arranged on the side faces of the steel pipe and are used for connecting and supporting the steel pipe.
6. The secondary-support-free high formwork overlapping construction method for the large-section concrete beam according to claim 1, characterized in that: the Bailey beam is placed on the cover beam and fixed by the channel steel gantry.
7. The secondary-support-free high formwork overlapping construction method for the large-section concrete beam according to claim 1, characterized in that: the large-section concrete beam is superposed and poured for three times, and the concrete pouring method comprises the following steps of firstly, before the first layer of concrete is poured, arranging two reinforcing steel bars with the lengths matched with the lengths of the first layer of concrete on the top surface of the first layer of concrete along the direction of the large-section concrete beam, pouring the first layer of concrete, vertically inserting shear-resistant reinforcing steel bars with uniform intervals on the top surface of the first layer of concrete after the concrete is initially set and before final set, and after the first layer of concrete reaches the preset strength, sequentially pouring the second layer of concrete and the third layer of concrete on the top surface of the first layer of concrete according to the mode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010362107.6A CN111576734A (en) | 2020-04-30 | 2020-04-30 | Secondary-support-free high formwork overlapping construction method for large-section concrete beam |
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| CN202010362107.6A CN111576734A (en) | 2020-04-30 | 2020-04-30 | Secondary-support-free high formwork overlapping construction method for large-section concrete beam |
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2020
- 2020-04-30 CN CN202010362107.6A patent/CN111576734A/en active Pending
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Application publication date: 20200825 |
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