CN106939554A - Expanded letter steel girder erecting machine and its beam erecting method - Google Patents
Expanded letter steel girder erecting machine and its beam erecting method Download PDFInfo
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- CN106939554A CN106939554A CN201710151850.5A CN201710151850A CN106939554A CN 106939554 A CN106939554 A CN 106939554A CN 201710151850 A CN201710151850 A CN 201710151850A CN 106939554 A CN106939554 A CN 106939554A
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- steel girder
- overhead traveling
- traveling crane
- expanded letter
- girder
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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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- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a kind of expanded letter steel girder erecting machine and its beam erecting method, it is related to Bridge Construction technical field, including：Agent structure, it includes two girders being oppositely arranged, and the two ends of two girders are fixed with the subject beam of two girders of connection；Supporting mechanism, it includes the front leg strut, middle supporting leg and rear support leg being fixed on two girders, and the front leg strut, middle supporting leg and rear support leg are equipped with retractor device, and retractor device can make front leg strut, middle supporting leg and rear support leg elongation and shrink；And boom hoisting, it includes overhead traveling crane and suspender, and suspender is arranged on below overhead traveling crane, and overhead traveling crane can go up receipts and decentralization suspender, and overhead traveling crane can also be moved along bridge vertical and horizontal.Existing supporting bridge space, basic bearing capacity are limited and under can not using the operating mode of the construction characteristics such as large scale equipment meeting by the present invention, can realize expanded letter steel girder it is efficient, stably, the erection of safety.
Description
Technical field
The present invention relates to Bridge Construction technical field, and in particular to a kind of expanded letter steel girder erecting machine and its side of setting a roof beam in place
Method.
Background technology
Domestic first batch of large-scale road-cum-rail bridge is with the continuous growth and the increase of vehicle flowrate of Years Of Service, land
It is continuous to enter maintenance cycle.Existing bridge highway bridge panel is generally concrete structure, and long-term use can cause local concrete block
Breakage is dropped, and serious potential safety hazard is caused to running railway line operation, and the replacing of floorings turns into such bridge maintaining
One of important content.
Brand-new floorings generally using the orthotropic steel girder floorings (hereinafter referred to as steel girder) that last a long time, because by
Existing bridge structure limitation and the requirement of installation effectiveness, brand-new steel girder piecemeal are often larger, and are done business when setting up by railway
, be present supporting and space, basic bearing capacity and be limited in many-sided influences such as line, highway communication and navigation channel transport, and large-scale set
For the problems such as can not using, cause traditional steel main beam supporting method can not meet process requirements.
The content of the invention
For defect present in prior art, it is an object of the invention to provide a kind of expanded letter steel girder erecting machine,
Existing supporting bridge space, basic bearing capacity is met to be limited, and can not use under the operating mode of the construction characteristics such as large scale equipment, it is real
The erection efficient, stably, safe of existing expanded letter steel girder.
To achieve the above objectives, the present invention is adopted the technical scheme that：
A kind of expanded letter steel girder erecting machine, including：
Agent structure, it includes two girders being oppositely arranged, and the two ends of two girders are fixed with two institutes of connection
State the subject beam of girder；
Supporting mechanism, it includes the front leg strut, middle supporting leg and rear support leg being fixed on two girders, the preceding branch
Leg, middle supporting leg and rear support leg are equipped with retractor device, and the retractor device can make the front leg strut, middle supporting leg and rear support leg elongation
And contraction；And
Boom hoisting, it includes overhead traveling crane and suspender, and the suspender is arranged on below the overhead traveling crane, the overhead traveling crane can go up receipts and
The suspender is transferred, and the overhead traveling crane can also be moved along bridge vertical and horizontal.
On the basis of above-mentioned technical proposal, the girder is provided with girder track, and the boom hoisting is provided with crane crossbeam,
The overhead traveling crane is fixed in the crane crossbeam, and the crane crossbeam is arranged on the girder track, and the crane crossbeam
It can be moved along the girder.
On the basis of above-mentioned technical proposal, the boom hoisting also includes traverse displacement unit, and the traverse displacement unit drives institute
Overhead traveling crane is stated along crane crossbeam transverse shifting.
On the basis of above-mentioned technical proposal, the boom hoisting also includes two leveling auxiliary hooks being oppositely arranged, each
The two ends of the leveling auxiliary hook are connected with the overhead traveling crane and suspender respectively.
On the basis of above-mentioned technical proposal, the retractor device is hydraulic telescopic device.
On the basis of above-mentioned technical proposal, the expanded letter steel girder erecting machine also include running gear, it is described walk luggage
Put the bottom for being arranged on the middle supporting leg and rear support leg.
At the same time, the present invention also provides a kind of beam erecting method, is meeting existing supporting bridge space, basic bearing capacity
It is limited, and can not use under the operating mode of the construction characteristics such as large scale equipment, realize the frame efficient, stably, safe of expanded letter steel girder
If.
To achieve the above objectives, the present invention is adopted the technical scheme that：
A kind of method using above-mentioned expanded letter steel main girder frame beam frame beam, this method comprises the following steps：
Steel girder is transported to the expanded letter steel girder erecting machine rear using beam dolly is transported；
Overhead traveling crane is moved into expanded letter steel girder erecting machine forefront, rear support leg is lifted, fortune beam dolly carries steel girder row into
In the middle of supporting leg and rear support leg, feeding beam is completed；
Rear support leg is fallen, and overhead traveling crane is moved to directly over steel girder, and decentralization suspender is connected with steel girder, and hoisting steel girder transports beam
Dolly leaves；
Middle supporting leg is lifted, overhead traveling crane carry steel girder forward movement, when steel girder all by middle supporting leg when, middle supporting leg is fallen
Under；
When overhead traveling crane indulges bridge to after moving into place, steel girder direction across bridge position is adjusted；
Overhead traveling crane transfers suspender, steel girder is placed on installation site；
The connection of suspender and steel girder is released, suspender is upwards collected through, overhead traveling crane moves to expanded letter steel girder erecting machine rearmost,
Front leg strut is lifted up；
Expanded letter steel girder erecting machine traveling is driven, when above front leg strut to next section bridge crossbeam, stops traveling, by width
Body steel girder erecting machine front leg strut is dropped down onto on bridge crossbeam；
Repeat the above steps, until construction is completed.
On the basis of above-mentioned technical proposal, the decentralization suspender is connected with steel girder, after hoisting steel girder, also utilizes tune
Flat auxiliary hook carries out pose adjustment to steel girder.
On the basis of above-mentioned technical proposal, the steel girder is driven to be moved along bridge lateral come to steel using traverse displacement unit
Girder direction across bridge position is adjusted.
Compared with prior art, the advantage of the invention is that：
(1) the expanded letter steel girder erecting machine in the present invention includes middle supporting leg and rear support leg, due to middle supporting leg and rear support leg tool
There is Telescopic, provide enough headroom for steel girder feeding beam, reach, expanded letter steel master is realized in the case of equipment volume is less
Transhipment of the beam in erection process.
(2) crane crossbeam and traverse displacement unit in the present invention realize the quick in place of steel girder.The leveling of leveling auxiliary hook
Function, realizes steel girder exact posture and quickly adjusts, improve the efficiency of steel main beam supporting.
(3) in expanded letter steel girder erecting machine feeding beam and traveling, overhead traveling crane respectively positioned at expanded letter steel girder erecting machine most before
End and rearmost end, carry out counterweight using overhead traveling crane own wt, reduce the main screw lift of expanded letter steel girder erecting machine, improve simultaneously
The resistance to overturning of expanded letter steel girder erecting machine.
Brief description of the drawings
Fig. 1 is expanded letter steel girder erecting machine in the present invention and the side view of fortune beam dolly；
Fig. 2 is expanded letter steel girder erecting machine in the present invention and the rearview of fortune beam dolly；
Fig. 3 is fortune beam dolly fortune beam schematic diagram in the present invention；
Fig. 4 is fortune beam dolly feeding beam schematic diagram in the present invention；
Fig. 5 is the side view of suspender and pose adjustment in the present invention；
Fig. 6 is the rearview of suspender and pose adjustment in the present invention；
The schematic diagram that Fig. 7 moves forward for overhead traveling crane carrier beam in the present invention；
The side view that Fig. 8 moves for steel girder direction across bridge in the present invention；
The rearview that Fig. 9 moves for steel girder direction across bridge in the present invention；
Figure 10 falls beam schematic diagram for steel girder in the present invention；
Figure 11 is expanded letter steel girder erecting machine via traveling schematic diagram in the present invention
Figure 12 is expanded letter steel girder erecting machine schematic diagram in place in the present invention.
In figure：Supporting leg in 1- agent structures, 11- girders, 12- subject beams, 2- supporting mechanisms, 21- front leg struts, 22-,
23- rear support legs, 24- retractor devices, 3- boom hoistings, 31- overhead traveling cranes, 32- suspenders, 33- crane crossbeams, 34- traverse displacement units, 35-
Leveling auxiliary hook, 4- fortune beam dollies, 5- steel girders, 6- running gears, 7- bridge crossbeams, 8- erecting machine tracks.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Referring to shown in Fig. 1 and Fig. 2, the present invention provides a kind of expanded letter steel girder erecting machine, including agent structure 1, support machine
Structure 2, boom hoisting 3 and running gear 6.
Expanded letter steel girder erecting machine in the present invention includes two using double main girder structure, i.e. agent structures 1 and set relatively
The girder 11 put, the two ends of two girders 11 are fixed with subject beam 12.
Supporting mechanism 2 includes front leg strut 21, middle supporting leg 22 and the rear support leg 23 being fixed on two girders 11.Wherein preceding branch
Leg 21 is stood on existing bridge crossbeam 7, is mainly used in support.Middle supporting leg 22, rear support leg 23 are mainly used in bridge floor traveling.This
Outside, front leg strut 21, middle supporting leg 22 and rear support leg 23 are equipped with retractor device 24, and retractor device 24 can make front leg strut 21, middle supporting leg
22 and rear support leg 23 extend and shrink, space conversion work during erection for completing frame expanded letter steel girder.Stretched in the present invention
Compression apparatus 24 is hydraulic telescopic device.
Boom hoisting 3 includes overhead traveling crane 31 and suspender 32, and suspender 32 is arranged on the lower section of overhead traveling crane 31, and overhead traveling crane 31 can go up receipts and transfer
Suspender 32, and overhead traveling crane 31 can also move along bridge vertical and horizontal.
Girder track is provided with girder 11 in the present invention, crane crossbeam 33 is provided with boom hoisting 3, overhead traveling crane 31 is fixed on day
In car crossbeam 33, crane crossbeam 33 is arranged on girder track, and crane crossbeam 33 can be moved along girder 11, so that overhead traveling crane 31
It can be vertically moved along bridge.In addition, boom hoisting 3 also includes traverse displacement unit 34, traverse displacement unit 34 is used to drive the edge of overhead traveling crane 31
The transverse shifting of crane crossbeam 33, so that overhead traveling crane 31 can be moved along bridge lateral.
Boom hoisting 3 also includes two leveling auxiliary hooks 35 for being oppositely arranged, the two ends of each leveling auxiliary hook 35 respectively with day
Car 31 is connected with suspender 32.After boom hoisting 3 slings steel girder 5, just the attitude of steel girder 5 is entered using leveling auxiliary hook 35
Row adjustment.
Running gear 6 is arranged on the bottom of middle supporting leg 22 and rear support leg 23, is driven by motor, and running gear 6 can be
Traveling on erecting machine track 8.
The present invention also provides a kind of method using above-mentioned expanded letter steel main girder frame beam frame beam, comprises the following steps：
S1. steel girder 5 is transported to expanded letter steel girder erecting machine rear using transporting beam dolly 4.
Fortune beam dolly 4 shown in Figure 3, matching with expanded letter steel girder erecting machine, leads on mounted bridge floor
Cross erecting machine track 8 and carry out traveling, realize that steel girder 5 puts transport to expanded letter steel girder erecting machine rear by the upper bridge location of lifting, treat
Rear support leg 23 carries out feeding beam after lifting, erecting machine track 8 is with the erection progress gradually spreading of steel girder 5.
S2. overhead traveling crane 31 is moved into expanded letter steel girder erecting machine forefront, rear support leg 23 is lifted, fortune beam dolly 4 carries steel master
In the middle of the row of beam 5 to middle supporting leg 22 and rear support leg 23, feeding beam is completed.
Shown in Figure 4, rear support leg 23 sets hydraulic telescopic device, is set a roof beam in place in the fortune carrier beam of beam dolly 4 to expanded letter steel girder
During machine rear, rear support leg 23 starts hydraulic telescopic device and is lifted up, and meets steel girder 5 and is fed by expanded letter steel girder erecting machine rear
Beam by headroom during rear support leg 23, whne steel girder 5 all by rear support leg 23 when, rear support leg 23 is again started up hydraulically extensible dress
Put, fall rear support leg 23, complete feeding beam.
S3. rear support leg 23 is fallen, and overhead traveling crane 31 is moved to directly over steel girder 5, and decentralization suspender 32 is connected with steel girder 5, is lifted by crane
Steel girder 5, fortune beam dolly 4 leaves.
It is connected in the present invention in decentralization suspender 32 with steel girder 5, after hoisting steel girder 5, also using leveling auxiliary hook 35 to steel
Girder 5 carries out pose adjustment.
Referring to shown in Fig. 5 and Fig. 6, boom hoisting 3 includes overhead traveling crane 31, suspender 32 and leveling auxiliary hook 35.Transport the feeding beam of beam dolly 4
After in place, start overhead traveling crane 31, transfer suspender 32, be connected with the hanger of steel girder 5, hoisting steel girder 5, fortune beam dolly 4 leaves, and
Steel girder pose adjustment is carried out by leveling auxiliary hook 35, it is adjusted to horizontality.
S4. middle supporting leg 22 is lifted, and overhead traveling crane 31 carries steel girder 5 and moved forward, when steel girder 5 all passes through middle supporting leg 22
When, middle supporting leg 22 is fallen.
It is shown in Figure 7, girder track is provided with girder 11 in the present invention, crane crossbeam 33, day are provided with boom hoisting 3
Car 31 is fixed in crane crossbeam 33, and crane crossbeam 33 is arranged on girder track, and crane crossbeam 33 can be moved along girder 11, from
And overhead traveling crane 31 is vertically moved along bridge.Middle supporting leg 22 sets hydraulic telescopic device, and overhead traveling crane 31 carries the reach of steel girder
Before, starting hydraulic telescopic device is lifted up middle supporting leg 22, meets headroom when steel girder 5 moves forward, to ensure its stability,
After steel girder 5 is by middle supporting leg 22, being again started up hydraulically extensible pressure device falls middle supporting leg 22.
S5. when overhead traveling crane 31 indulges bridge to after moving into place, the direction across bridge position of steel girder 5 is adjusted.
Referring to shown in Fig. 8 and Fig. 9, boom hoisting 3 sets traverse displacement unit 34.Steel girder 5 indulges bridge to after moving into place, according to
The direction across bridge installation site of steel girder 5, starts traverse displacement unit 34 and carries out lateral attitude adjustment.
In said process, because middle supporting leg 22 and rear support leg 23 have Telescopic, provided for the feeding beam of steel girder 5, reach
Enough headroom, realize transhipment of the expanded letter steel girder in erection process in the case of equipment volume is less.In addition, overhead traveling crane is horizontal
Beam 33 and traverse displacement unit 34 realize the quick in place of steel girder 5.The levelling function of leveling auxiliary hook 35, realizes the essence of steel girder 5
True attitude is quickly adjusted, and improves the efficiency of steel main beam supporting.
S6. the decentralization of overhead traveling crane 31 suspender 32, makes steel girder 5 be placed on installation site.
Shown in Figure 10, when steel girder 5 indulges bridge to after being moved into place with direction across bridge, overhead traveling crane 31 can transfer suspender 32
Steel girder 5 is set to be placed in predetermined installation site.
S7. the connection of suspender 32 and steel girder 5 is released, suspender 32 is upwards collected through, overhead traveling crane 31 moves to expanded letter steel main girder frame
Beam machine rearmost, front leg strut 21 is lifted up.
Shown in Figure 11, in expanded letter steel girder erecting machine feeding beam and traveling, overhead traveling crane 31 is located at expanded letter steel girder respectively
Erecting machine foremost and rearmost end, using the own wt of overhead traveling crane 31 carry out counterweight, reduce the whole of expanded letter steel girder erecting machine
Machine weight, while improving the resistance to overturning of expanded letter steel girder erecting machine.
Front leg strut 21 is set after hydraulic telescopic device, can be lifted front leg strut 21 in expanded letter steel girder erecting machine traveling
And decentralization.In addition when the elevation of bridge crossbeam 7 changes, front leg strut 21 can also be heightened voluntarily, enhanced and starved suitable to existing structure
Ying Xing.
S8. expanded letter steel girder erecting machine traveling is driven, when front leg strut 21 to next section bridge 7 top of crossbeam, stops walking
OK, front leg strut 21 is dropped down onto on bridge crossbeam 7.
Shown in Figure 12, the girder erecting machine traveling of expanded letter steel is mainly by being arranged on middle supporting leg 22 and rear support leg in the present invention
The running gear 6 of 23 bottoms, is driven by motor, and running gear 6 can be in the traveling of erecting machine track 8.Front leg strut 21 sets liquid
Pressure stretch compression apparatus, in expanded letter steel girder erecting machine via traveling, starting hydraulic telescopic device makes front leg strut 21 be lifted off branch
Crossbeam is supportted, after the completion of traveling, front leg strut 21, which is again started up hydraulic telescopic device, falls front leg strut 21.
S9. repeat step S1 is to S8, until construction is completed.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
On the premise of the principle of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as the protection of the present invention
Within the scope of.The content not being described in detail in this specification belongs to prior art known to professional and technical personnel in the field.
Claims (9)
1. a kind of expanded letter steel girder erecting machine, it is characterised in that including：
Agent structure (1), it includes two girders being oppositely arranged (11), and the two ends of two girders (11) are fixed with connection
The subject beam (12) of two girders (11)；
Supporting mechanism (2), it includes the front leg strut (21), middle supporting leg (22) and rear support leg being fixed on two girders (11)
(23), the front leg strut (21), middle supporting leg (22) and rear support leg (23) are equipped with retractor device (24), the retractor device (24)
The front leg strut (21), middle supporting leg (22) and rear support leg (23) elongation can be made and shunk；And
Boom hoisting (3), it includes overhead traveling crane (31) and suspender (32), and the suspender (32) is arranged on below the overhead traveling crane (31),
The overhead traveling crane (31) can go up receipts and transfer the suspender (32), and the overhead traveling crane (31) can also be moved along bridge vertical and horizontal.
2. expanded letter steel girder erecting machine as claimed in claim 1, it is characterised in that：The girder (11) is provided with girder track,
The boom hoisting (3) is provided with crane crossbeam (33), and the overhead traveling crane (31) is fixed in the crane crossbeam (33), the overhead traveling crane
Crossbeam (33) is arranged on the girder track, and the crane crossbeam (33) can be mobile along the girder (11).
3. expanded letter steel girder erecting machine as claimed in claim 2, it is characterised in that：The boom hoisting (3) also includes traversing
Device (34), the traverse displacement unit (34) drives the overhead traveling crane (31) along crane crossbeam (33) transverse shifting.
4. expanded letter steel girder erecting machine as claimed in claim 1, it is characterised in that：The boom hoisting (3) also includes two
The leveling auxiliary hook (35) being oppositely arranged, the two ends of each leveling auxiliary hook (35) respectively with the overhead traveling crane (31) and suspender (32)
It is connected.
5. expanded letter steel girder erecting machine as claimed in claim 1, it is characterised in that：The retractor device (24) is hydraulically extensible
Device.
6. expanded letter steel girder erecting machine as claimed in claim 1, it is characterised in that：The expanded letter steel girder erecting machine also includes
Running gear (6), the running gear (6) is arranged on the bottom of the middle supporting leg (22) and rear support leg (23).
7. the method for the expanded letter steel main girder frame beam frame beam described in a kind of utilization claim 1, it is characterised in that this method includes
Following steps：
Steel girder (5) is transported to the expanded letter steel girder erecting machine rear using beam dolly (4) is transported；
Overhead traveling crane (31) is moved into expanded letter steel girder erecting machine forefront, rear support leg (23) is lifted, fortune beam dolly (4) carries steel girder
(5) go to middle supporting leg (22) and rear support leg (23), complete feeding beam；
Rear support leg (23) is fallen, and overhead traveling crane (31) is moved to directly over steel girder (5), and decentralization suspender (32) is connected with steel girder (5), is risen
Steel girder (5) is hung, fortune beam dolly (4) leaves；
Middle supporting leg (22) is lifted, and overhead traveling crane (31) carries steel girder (5) forward movement, when steel girder (5) all passes through middle supporting leg
(22) when, middle supporting leg (22) is fallen；
When overhead traveling crane (31) indulges bridge to after moving into place, steel girder (5) direction across bridge position is adjusted；
Overhead traveling crane (31) decentralization suspender (32), makes steel girder (5) be placed on installation site；
The connection of suspender (32) and steel girder (5) is released, suspender (32) is upwards collected through, overhead traveling crane (31) moves to expanded letter steel main girder frame
Beam machine rearmost, front leg strut (21) is lifted up；
Expanded letter steel girder erecting machine traveling is driven, when above front leg strut (21) to next section bridge crossbeam (7), stops traveling,
Expanded letter steel girder erecting machine front leg strut (21) is dropped down onto on bridge crossbeam (7)；
Repeat the above steps, until construction is completed.
8. beam erecting method as claimed in claim 7, it is characterised in that：The decentralization suspender (32) is connected with steel girder (5), rises
Hang after steel girder (5), pose adjustment also is carried out to steel girder (5) using leveling auxiliary hook (35).
9. beam erecting method as claimed in claim 7, it is characterised in that：The steel girder (5) is driven using traverse displacement unit (34)
Move to be adjusted steel girder (5) direction across bridge position along bridge lateral.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710151850.5A CN106939554A (en) | 2017-03-15 | 2017-03-15 | Expanded letter steel girder erecting machine and its beam erecting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710151850.5A CN106939554A (en) | 2017-03-15 | 2017-03-15 | Expanded letter steel girder erecting machine and its beam erecting method |
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| Publication Number | Publication Date |
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| CN106939554A true CN106939554A (en) | 2017-07-11 |
Family
ID=59468766
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710151850.5A Pending CN106939554A (en) | 2017-03-15 | 2017-03-15 | Expanded letter steel girder erecting machine and its beam erecting method |
Country Status (1)
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| CN (1) | CN106939554A (en) |
Cited By (4)
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| CN109837837A (en) * | 2019-03-06 | 2019-06-04 | 上海市基础工程集团有限公司 | Mounting device and method for concrete-steel Beam prefabricated bridge |
| CN111549684A (en) * | 2020-06-12 | 2020-08-18 | 柳州欧维姆机械股份有限公司 | Construction device for prefabricating bridge deck by using steel-concrete composite beam and application method of construction device |
| CN113756199A (en) * | 2021-09-15 | 2021-12-07 | 上海市基础工程集团有限公司 | Construction method for erecting full-width prefabricated bridge deck of steel-concrete composite beam |
| CN115125849A (en) * | 2022-06-24 | 2022-09-30 | 西南大学 | Detachable front supporting leg structure for wide-body bridge girder erection machine and use method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109837837A (en) * | 2019-03-06 | 2019-06-04 | 上海市基础工程集团有限公司 | Mounting device and method for concrete-steel Beam prefabricated bridge |
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| CN115125849A (en) * | 2022-06-24 | 2022-09-30 | 西南大学 | Detachable front supporting leg structure for wide-body bridge girder erection machine and use method thereof |
| CN115125849B (en) * | 2022-06-24 | 2023-02-24 | 西南大学 | Detachable front supporting leg structure for wide-body bridge girder erection machine and use method thereof |
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Application publication date: 20170711 |