CN113981828A - Temporary tie bar crossing mechanism - Google Patents
Temporary tie bar crossing mechanism Download PDFInfo
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- CN113981828A CN113981828A CN202111323832.3A CN202111323832A CN113981828A CN 113981828 A CN113981828 A CN 113981828A CN 202111323832 A CN202111323832 A CN 202111323832A CN 113981828 A CN113981828 A CN 113981828A
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- temporary tie
- tie rod
- cover
- scraping
- temporary
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention provides a temporary tie bar crossing mechanism which comprises a plurality of pocket hanging seats and a plurality of transfer pieces, wherein the pocket hanging seats are arranged at intervals, each transfer piece comprises a guide rail and a sliding piece, the guide rails are connected with one sides of the pocket hanging seats facing a river surface, the sliding pieces are arranged on the guide rails in a sliding mode, and the sliding pieces are provided with anti-scraping shafts, so that the probability of scraping of the temporary tie bar in the process of crossing the river surface of a frame can be reduced.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of bridge construction, in particular to a temporary tie bar crossing mechanism.
[ background of the invention ]
The concrete filled steel tube tied arch bridge has the advantages of attractive appearance, good economy, short construction period and the like, and has a large market in medium-span bridges. When a tied arch bridge is built, in order to enable an arch end support to be a thrust-free arch without generating horizontal thrust, a temporary tie bar needs to be installed between arch supports. The temporary tie bar needs to be installed to cross the river surface, in the prior art, the temporary tie bar is wound in one river bank, a winch is placed on the other river bank, one end of the temporary tie bar is connected through a traction rope by the winch, the winch is started, the temporary tie bar is pulled out from the river bank under the traction of the traction rope, the pulled temporary tie bar gradually crosses the river surface under the assistance of carrying and moving of a construction ship, and the opposite two ends of the temporary tie bar are respectively fixed in pre-buried pore channels on an arch support after crossing the river surface. With the development of the temporary tied arch bridge towards large span and low energy consumption, the temporary tied bars are mostly made of permanent tied bar materials, and in the process of installing the temporary tied bars by adopting a drag river-crossing installation method, the surface layers of the temporary tied bars can be rubbed with the construction ship, the arch support, the ground and the orifices of the pre-buried pore canals in a scraping manner, so that the surface layers of the temporary tied bars are damaged, and the service life of the tied arch bridge can be directly shortened due to the damage of the surface layers.
In addition, the temporary tie bar has large installation and tensioning deflection, is easy to collide with the lattice beam and has potential safety hazards in construction.
[ summary of the invention ]
The present invention is directed to solve at least one of the above-mentioned problems, and an object of the present invention is to provide a temporary tie rod crossing mechanism that can reduce the possibility of the temporary tie rod being scratched during crossing a river surface.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a temporary tie bar crossing mechanism comprises a plurality of pocket hanging seats and a transfer piece, wherein the pocket hanging seats are arranged at intervals, the transfer piece comprises a guide rail and a sliding piece, the guide rail is connected with one side, facing a river surface, of the pocket hanging seats, the sliding piece is slidably arranged on the guide rail, and the sliding piece is provided with a scratch-proof shaft.
Further, the sliding part includes sliding block and installing frame, the sliding block is located with sliding on the guided way, the installing frame is connected the sliding block, the installing frame runs through and is equipped with the mounting groove, prevent scraping the axle dress and locate in the mounting groove.
Furthermore, the pocket hanging seat comprises two groove steel plates and two hanging lug plates, the two groove steel plates are oppositely arranged, and the two hanging lug plates are arranged at two opposite ends of the groove steel plates and are welded with the two groove steel plates; the guide rail is connected with the two channel steel plates.
Furthermore, the scratch-resistant collar is concavely provided with a limiting groove around the periphery.
Furthermore, a reinforcing lifting lug plate is arranged at the position, corresponding to the guide rail, of the pocket lifting seat.
Further, the transfer piece still includes and prevents scraping the cover, prevent scraping the cover and locate the installing frame outside and with the guided way is connected.
Further, the relative both ends of preventing scraping the cover are equipped with the buffering curved bar, the one end of buffering curved bar with the end connection of preventing scraping the cover, the buffering curved bar towards deviating from prevent that the direction of scraping the cover extends and court prevent that the cover buckles.
Furthermore, the scratch-proof shaft is made of polyamide.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. above-mentioned interim tie rod strides mechanism for supplementary interim tie rod tractive is horizontal frame river face, when using, interim tie rod is accepted on the scratch-proof axle, when interim tie rod atress was along the width direction tractive of river face, the scratch-proof axle drives whole glide part along the length direction slip of guided way under the frictional force effect between interim tie rod and the scratch-proof axle, thereby make interim tie rod stride the river face, at the river face in-process of strideing across, interim tie rod does not contact other stereoplasm parts, can reduce the probability that interim tie rod takes place to scratch.
2. Because prevent scraping the cover and locate the outside of installing frame, all lie in when the temporary tie rod drives and prevents scraping the axle and slide along the guided way and prevent scraping the cover, prevent scraping the cover and can avoid the lattice roof beam to bump with temporary tie rod when the installation.
[ description of the drawings ]
Fig. 1 is a schematic structural view of a temporary tie bar crossing mechanism according to a preferred embodiment of the present invention.
Fig. 2 is an enlarged view at a in fig. 1.
Fig. 3 is a schematic construction view of a method for pulling a crossing by a temporary tie bar according to a preferred embodiment of the present invention.
Fig. 4 is a sectional view taken along line B-B in fig. 3.
Fig. 5 is an enlarged view at C in fig. 4.
In the attached drawing, 100-temporary tie bar crossing mechanism, 1-pocket lifting seat, 11-groove steel plate, 12-lifting lug plate, 2-transfer piece, 21-guide rail, 22-sliding piece, 220-limit groove, 221-scratch-proof shaft, 222-sliding block, 223-mounting frame, 224-mounting groove, 23-scratch-proof cover, 24-buffer bending strip, 3-reinforcing lifting lug plate, 4-cable releasing frame, 6-winch, 61-traction rope, 101-pocket lifting rope, 200-temporary tie bar, 300-arch rib, 400-lattice beam, 500-85 national elevation standard, 600-river and 700-arch seat.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 to 5, a preferred embodiment of the present invention provides a temporary tie bar crossing mechanism 100, which includes a plurality of pocket hanging seats 1 and a plurality of transfer members 2, wherein the plurality of pocket hanging seats 1 are spaced apart, the plurality of transfer members 2 are spaced apart along a length direction of the pocket hanging seats 1, the transfer members 2 include guide rails 21 and sliding members 22, and the guide rails 21 are connected to a side of the plurality of pocket hanging seats 1 facing a river. The number of the sliding pieces 22 is several, the sliding pieces 22 are slidably arranged on the corresponding guide rails 21, the sliding pieces 22 are provided with scratch-proof shafts 221, and the scratch-proof shafts 221 are made of polyamide.
The temporary tie bar crossing mechanism is used for assisting the temporary tie bar 200 in pulling the cross frame river surface, when the temporary tie bar 200 is used, the temporary tie bar 200 is received on the scratch-proof shaft 221, when the temporary tie bar 200 is pulled along the width direction of the river surface 600 under force, the scratch-proof shaft 221 drives the whole sliding piece 22 to slide along the length direction of the guide rail 21 under the action of friction force between the temporary tie bar 200 and the scratch-proof shaft 221, so that the temporary tie bar 200 crosses the river surface 600, and in the process of crossing the river surface 600, the temporary tie bar 200 does not contact other hard components, and the probability of scraping of the temporary tie bar 200 can be reduced.
In the present embodiment, the slider 22 includes a slider 222 and a mounting frame 223. The sliding block 222 is slidably disposed on the guide rail 21, specifically, the guide rail 21 is provided with a sliding slot running through two ends along the length direction, and the sliding block 222 is slidably disposed in the sliding slot and can slide out of the guide rail 21 from two opposite ends of the sliding slot. The mounting frame 223 is connected with the sliding block 222, the mounting frame 223 is provided with a mounting groove 224 in a penetrating manner, and the scratch-proof shaft 221 is arranged in the mounting groove 224, specifically, the mounting frame 223 comprises two vertical plates and two transverse plates, the vertical plates and the transverse plates are made of steel plates, the two vertical plates are arranged oppositely, the two transverse plates are arranged oppositely at two opposite ends of the vertical plates, and two opposite ends of each transverse plate are respectively welded with the two vertical plates to form the mounting groove 224; the scraping-proof shaft 221 is positioned in the mounting groove 224, and two vertical plates are fixedly connected with two opposite ends of the scraping-proof shaft 221; one of which is a cross plate welded slider 222.
In the present embodiment, the pocket hanger 1 includes two channel steel plates 11 and two hanger plates 12. Two groove steel sheets 11 set up relatively, and two lug plates 12 are located the relative both ends of groove steel sheet 11 and all weld with the side of two groove steel sheets 11 dorsad transfer member 2 to be used for crossing interim tie rod and crossing mechanism 100 and hoist. The guided way 21 is connected with two groove steel plates 11, in this embodiment, pocket hanging seat 1 is equipped with a reinforcement ear plate 3 corresponding to a guided way 21 department, reinforcement ear plate 3 and two groove steel plates 11 all weld, guided way 21 still with the bottom welding of reinforcement ear plate 3, in interim tie rod strides mechanism 100 pocket and hangs the in-process, reinforcement ear plate 3 department is pocket hung with the pocket lifting rope, strengthen interim tie rod 200 and stride the in-process of river surface and stride the tractive force of mechanism 100 to interim tie rod.
In the present embodiment, the structure of the shackle plate 12 and the reinforcing shackle plate 3 is the same as the structure of the shackle disclosed in chinese patent application No. CN108589539B, "a temporary tie bar cross mounting method", and the connecting portion between the shackle plate 12 and the reinforcing shackle plate 3 is welded to the two channel steel plates 11, and the fixing portion between the guide rail 21 and the reinforcing shackle plate 3 and the bottom portions of the two channel steel plates 11 are welded.
In this embodiment, the scratch-proof shaft 221 is recessed with a limiting groove 220 around the periphery, and when the temporary tie bar 200 is received on the scratch-proof shaft 221, the temporary tie bar 200 is limited in the limiting groove 220 to prevent the temporary tie bar 200 from being scratched by two vertical plates.
In this embodiment, the transfer member 2 further includes a scratch cover 23, the scratch cover 23 is covered outside the mounting frame 223 and connected to the guide rail 21, and specifically, the scratch cover 23 is in a shape of a strip cylinder. The scratch-proof cover 23 covers the outside of the mounting frame 223, the scratch-proof cover 23 is made of an iron wire net, the scratch-proof shaft 221 is driven by the temporary tie bar 200 to slide along the guide rail 21, the scratch-proof cover 23 is located in the scratch-proof cover 23, and the grid beam can be prevented from colliding with the temporary tie bar 200 during installation.
In the present embodiment, the opposite ends of the scratch-proof cover 23 are provided with the buffer bent bars 24, the buffer bent bars 24 are made of polyamide, one end of the buffer bent bars 24 is connected with the end of the scratch-proof cover 23, and the buffer bent bars 24 extend in a direction away from the scratch-proof cover 23 and are bent toward the scratch-proof cover 23 to form an arc shape. When the temporary tie bar 200 moves to the end of the guide rail 21 and passes out of the scratch-proof cover 23, since the buffer curved bar 24 is in the curved shape, the buffer curved bar 24 is forced to bend to play a buffer effect when the temporary tie bar 200 collides with the buffer curved bar 24, thereby preventing the temporary tie bar 200 and the scratch-proof cover 23 from being scratched.
The embodiment also provides a method for drawing and crossing the temporary tie bar 200, which is used for drawing and crossing the river surface and installing the temporary tie bar, and the method is completed based on a pocket hanging system commonly used in the bridge building process in the prior art, and the pocket hanging system can comprise a plurality of pocket hanging ropes 101, and specifically comprises the following steps:
the mechanism provides: the temporary tie rod crossing mechanism 100, the steering scratch-resistant member, the orifice scratch-resistant member, the cable releasing frame 4 and the winch 6 are provided, wherein the structures and the arrangement manners of the steering scratch-resistant member, the orifice scratch-resistant member, the cable releasing frame 4 and the winch 6 are the same as those disclosed in the "temporary tie rod crossing installation method" in the chinese patent publication No. CN108589539B, and thus no further description is given here.
Arranging a pre-buried pore channel:
when the arch bases 700 on two banks are built, a first embedded hole channel is arranged on one arch base 700 in a penetrating manner, and a first inlet hole and a first outlet hole are formed at two opposite ends of the first embedded hole channel respectively; a second pre-buried hole is formed through the other arch support 700, and a second inlet hole and a second outlet hole are formed at two opposite ends of the second pre-buried hole.
Calculating a design elevation: the design target height of the temporary tie rod crossing mechanism 100 is calculated by: Hh-HL + h + lS1+lS2Wherein, Hh is the design elevation, and HL is the lattice beam 400 installation elevation of arched bridge, and this distance is: the temporary tie bar has an intersection point with the upper surface of the grid beam 400 across the vertical central axis 1a of the mechanism 100, the intersection point being a vertical distance from the 85-country elevation reference 500; h is the distance from one side of the lattice beam 400 back to the ground to one side of the channel steel plate 11 in the pocket hanging seat 1 back to the ground, lS1Is the length of the pocket sling 101 in a relaxed state,/S2The length of the pocket lifting rope 101 after elongation due to the pocket lifting temporary tie bar crossing the mechanism 100 is calculated by: the hanging rope 101 is a steel wire rope with the self weight of GSThe total weight of the two channel steel plates 11 is GHThe weight of the temporary tie bar 200 at the temporary tie bar crossing mechanism 100 is GXThe vertical component force of the temporary tie bar 200 after being tensioned is FXThe related parameters of the steel wire rope are as follows: the length of the steel wire rope is L, and the elastic modulus is EKThe cross-sectional area of the steel wire is ASLength l of wire ropeS2＝(GS+GH+GX+FX)×L÷(EK×AS)。
Taking anti-scraping measures: the temporary tie bar is hung to the designed elevation below the arch rib 300 across the mechanism 100 through a pocket hanging rope 101, specifically, a plurality of pocket hanging seats 1, guide rails 21, anti-scraping covers 23 and reinforcing lug plates 3 are placed on a transfer ship, wherein the guide rails 21 and the anti-scraping covers 23 are placed in a multi-section mode;
pile numbers of a plurality of pocket hanging seats 1 are coded, the pile numbers and corresponding temporary tie rods cross the designed elevation of the mechanism 100 and are marked on the arch support 700 to serve as elevation level points, and points, which are contacted with the top surface of the channel steel plate 11, of the side edge of the mounting part of the lug plate 12 serve as designed elevation marks;
welding the multi-section guide rail 21 and the multi-section anti-scraping cover 23 with the pocket hanging seat 1 corresponding to the pile number, and welding the buffer bent strip 24 to the opposite ends of the anti-scraping cover 23 by using iron wires;
one end of a pocket lifting rope 101 is fixedly connected with the mounting part of the lifting lug plate 12, the other end of the pocket lifting rope is fixed with a working rope, the pocket lifting seat 1 is lifted to a design elevation below the arch rib 300 at intervals along the span direction of the bridge arch by the working rope, and then the corresponding pocket lifting seat 1 is fixedly connected with the arch rib 300 by the pocket lifting rope 101;
the constructor welds the multi-section guide rail 21 and the multi-section scratch-proof cover 23 end to end through overhead operation.
The orifice of the embedded duct for installing the temporary tie bar 200 is provided with an orifice anti-scraping part, the turning part of the temporary tie bar 200 is provided with a steering anti-scraping part, and the arrangement modes of the orifice anti-scraping part, the steering anti-scraping part, the first embedded duct, the first inlet orifice, the first outlet orifice, the second embedded duct, the second inlet orifice and the second outlet orifice are the same as the arrangement mode disclosed in the 'temporary tie bar crossing installation method' in the Chinese patent with the publication number of CN108589539B, and are not repeated herein.
And (3) height calibration:
1. aligning the elevation leveling points on the abutment 700;
2. the concrete method for positioning the design elevation of each pocket of the hanging seat 1 by utilizing the level gauge comprises the following steps: taking the elevation level point as a reference point, and adjusting the cross wire of the level gauge to a designed elevation;
3. the pocket lifting ropes 101 are retracted by the working cables to adjust the height of the pocket lifting seats 1, so that the designed elevation marks reach the cross wires of the level gauge, thereby ensuring that the pocket lifting seats 1 are all located at the designed elevation.
And (3) large-span installation:
one end of the temporary tie rod 200 is fixed with a winch 6, under the traction of the winch 6, the temporary tie rod 200 is contacted with the scratch-proof shaft 221 and is supported on the scratch-proof shaft 221, and the temporary tie rod 200 drives the scratch-proof shaft 221 to slide along the guide rail 21 so as to cross the river surface; in particular, the method comprises the following steps of,
the temporary tie bar 200 is wound on the cable releasing frame 4 and placed on an arch support 700 provided with a first embedded pore passage, a plurality of sliding pieces 22 are placed on the arch support 700 provided with the first embedded pore passage, the winch 6 is placed on the arch support 700 provided with a second embedded pore passage, the winch 6 is provided with a traction rope 61, one end of the traction rope 61 penetrates through the second embedded pore passage from a second outlet, penetrates through the scratch-proof cover 23 after penetrating out of a second inlet, and is fixed with one end of the temporary tie bar 200, which penetrates through the first embedded pore passage, through a pull buckle;
when the traction rope 61 is arranged, the sliding member 22 reserved on the arch 700 is pre-threaded on the traction rope 61, and specifically, the traction rope 61 passes through between the sliding block 222 and the scratch-proof shaft 221;
after the one end of the temporary tie rod 200 and the traction rope 61 pass through the steering anti-scraping part, the anti-scraping part enters a first embedded duct from an orifice of a first inlet orifice, and the first embedded duct passes through a first outlet orifice; the other end of the traction rope 61 is connected with the winch 6;
starting the winch 6, pulling the temporary tie rod 200 wound on the cable releasing frame 4 out of the cable releasing frame 4 under the traction of the traction rope 61, pausing the winch 6 when the temporary tie rod 200 is pulled to an opening at one end of the scratch-proof cover 23, sleeving the mounting frame 223 on the temporary tie rod 200 by constructors and limiting the temporary tie rod 200 in the limiting groove 220 of the scratch-proof shaft 221, hanging the sliding piece 22 and the temporary tie rod 200 at the moment, then installing the sliding block 222 into the sliding groove of the guide rail 21, starting the winch 6 again, enabling the sliding block 222 to slide along the guide rail 21 through friction force under the traction of the winch 6 by the temporary tie rod 200, and meanwhile, enabling the temporary tie rod 200 to stretch across the river surface under the connection of the scratch-proof shaft 221; it can be understood that, in order to better support the temporary tie rod 200, the winch 6 needs to be halted when the temporary tie rod 200 is pulled out by a certain length, and another sliding member 22 is hooked with the temporary tie rod 200 and mounted on the sliding groove of the guide rail 21;
when the temporary tie bar 200 is pulled across the river surface, the constructor collects the slide 22 sliding out of the guide rail 21 and moves the temporary tie bar 200 to the second pre-buried tunnel and penetrates the corresponding abutment 700 from the second outlet.
Fixing: the specific method of the step of fixing the opposite ends of the temporary tie bar 200 to the archways 700 on both sides of the river bank is the same as the method disclosed in the chinese patent invention "a temporary tie bar cross-mounting method" with the publication number CN108589539B, and is not described herein again.
It can be seen that the above method for pulling and crossing the temporary tie bar is implemented based on the temporary tie bar crossing mechanism 100, and since the guide rails 21 are connected with one side of the plurality of pocket hanging seats 1 facing the river surface, the calculation mode of the design elevation does not relate to the height of the temporary tie bar 200, thereby reducing the calculation amount of the design elevation.
It is understood that in order to prevent the pocket hanging seat 1 from shaking, the opposite ends of the pocket hanging seat 1 may be fixed by shaking prevention ropes in the same manner as disclosed in the "method of installing a temporary tie bar across" of the chinese invention patent publication No. CN108589539B, and thus, the details thereof are not repeated.
The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.
Claims (8)
1. A temporary tie rod crossing mechanism characterized by: including a plurality of pocket hanging seat (1) and transfer (2), a plurality of pocket hanging seat (1) interval sets up, transfer (2) including guided way (21) and sliding member (22), guided way (21) and a plurality of pocket hanging seat (1) is connected towards one side of river, sliding member (22) are located with sliding on guided way (21), sliding member (22) are equipped with prevents scraping axle (221).
2. A temporary tie rod spanning mechanism as claimed in claim 1, wherein: the sliding piece (22) comprises a sliding block (222) and a mounting frame (223), the sliding block (222) is slidably arranged on the guide rail (21), the mounting frame (223) is connected with the sliding block (222), a mounting groove (224) is formed in the mounting frame (223) in a penetrating mode, and the scratch-proof shaft (221) is installed in the mounting groove (224).
3. A temporary tie rod spanning mechanism as claimed in claim 2, wherein: the pocket hanging seat (1) comprises two groove steel plates (11) and two hanging lug plates (12), the two groove steel plates (11) are arranged oppositely, and the two hanging lug plates (12) are arranged at two opposite ends of the groove steel plates (11) and are welded with the two groove steel plates (11); the guide rail (21) is connected with the two slotted steel plates (11).
4. A temporary tie rod spanning mechanism as claimed in claim 3, wherein: the scraping-proof shaft (221) is concavely provided with a limit groove (220) around the periphery.
5. A temporary tie rod spanning mechanism as claimed in claim 4, wherein: a reinforcing lifting lug plate (3) is arranged at the position of the pocket lifting seat (1) corresponding to the guide rail (21).
6. A temporary tie rod spanning mechanism as claimed in any one of claims 2 to 5, wherein: transfer piece (2) still including preventing scraping cover (23), prevent scraping cover (23) cover and establish mounting frame (223) outside and with guided way (21) are connected.
7. A temporary tie rod spanning mechanism as claimed in claim 6, wherein: prevent scraping the relative both ends of cover (23) and be equipped with buffering curved bar (24), the one end of buffering curved bar (24) with prevent scraping the end connection of cover (23), buffering curved bar (24) towards deviating from prevent scraping the direction extension of cover (23) and court prevent scraping cover (23) and buckle.
8. A temporary tie rod spanning mechanism as claimed in claim 7, wherein: the scratch-proof shaft (221) is made of polyamide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111323832.3A CN113981828B (en) | 2021-11-10 | 2021-11-10 | Temporary tie rod crossing mechanism |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111323832.3A CN113981828B (en) | 2021-11-10 | 2021-11-10 | Temporary tie rod crossing mechanism |
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| CN113981828A true CN113981828A (en) | 2022-01-28 |
| CN113981828B CN113981828B (en) | 2023-09-22 |
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| CN113981828B (en) | 2023-09-22 |
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