CN105226560A - A kind of crossing frame and construction method thereof - Google Patents
A kind of crossing frame and construction method thereof Download PDFInfo
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- CN105226560A CN105226560A CN201510687603.8A CN201510687603A CN105226560A CN 105226560 A CN105226560 A CN 105226560A CN 201510687603 A CN201510687603 A CN 201510687603A CN 105226560 A CN105226560 A CN 105226560A
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- car body
- crossing frame
- jib
- hanging basket
- crossing
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Abstract
The invention discloses a kind of crossing frame and construction method thereof.This crossing frame comprises the first car body and the second car body that are arranged at movably and cross over thing both sides, described first car body and the second car body include crossing frame head, vehicle frame, jib and jib platform, wherein, described bottom of frame is provided with walking mechanism, and described vehicle frame is provided with slew gear; Described jib is installed on slew gear, described jib is provided with jib lubbing mechanism and hoisting mechanism; Described jib stage+module is at the head of jib; Described crossing frame head is arranged on jib platform; Be connected with the suspension hook on hoisting mechanism for manned hanging basket; Described crossing frame also comprises the block device for block operation.The present invention has easy to operate, safe and reliable, operation and saves time and the advantage less on peripheral facilities impact.
Description
Technical field
The present invention relates to electric operating field, particularly relate to a kind of crossing frame and construction method thereof.
Background technology
In electric power transmission industry; when there are great unexpected incidents (comprising meteorological disaster and the human factors such as high temperature, thunderstorm, typhoon, ice and snow) and causing great electrical network to damage event; need in Guan Chong region; such as high ferro, at a high speed, the high-tension line such as track traffic through overlying regions, draw and establish catch net.Domestic drawing establishes the pattern of this kind of catch net mainly to adopt non-self-propelled crossing frame at present; be roughly divided into four kinds: mao bamboon frame crossing frame (comprising steel pipe frame); only post pole grasp type crossing frame (comprising door type frame); whole shelves block and bridge-type crossing frame (being similar to the crossing frame of four cover rocker pole compositions); widely, but there is following shortcoming in above crossing frame application:
1. the crossing frame erection construction cycle is longer, complex operation, and particularly when needing to build the crossing frame of highly higher (>=30 meters), need to build material many, complex procedures, human input is large; Crossing frame base needs to dig dell and inserts, and crossing frame support body needs sectional, is then erected by external puller system or employing manpower.
2. large on peripheral facilities impact, the crossing frame of general structure is built due to the restriction of crossing frame frame structure, poor stability, need to draw and establish cubic bracing wire maintenance across the balance of body, and cubic pull wire grounding needs to set up earth anchor, earth anchor often needs to dig dell, landfill concrete etc., and operation is time-consuming and large on peripheral facilities impact.
3. when setting up crossing frame block, needing operating personnel to climb crossing frame head from ground by crossing frame and setting up, climbing process hazard, and the time is long, particularly during freezing rain and snow disaster, is prone to accidents.
In sum, how to provide a kind of easy to operate, safe and reliable, operation to save time and on the peripheral facilities less crossing frame of impact and construction method thereof, become the technical problem that those skilled in the art are urgently to be resolved hurrily.
Summary of the invention
In view of this, one of the problem to be solved in the present invention is to provide a kind of crossing frame, to solve the lower problem of existing crossing frame long construction period, complex procedures, poor stability and fail safe.
Two of the problem to be solved in the present invention is to provide a kind of above-mentioned crossing frame construction method.
For one of solving the problem, the invention provides a kind of crossing frame, comprise the first car body and the second car body that are arranged at movably and cross over thing both sides, described first car body and the second car body include crossing frame head, vehicle frame, jib and jib platform, wherein,
Described bottom of frame is provided with walking mechanism, and described vehicle frame is provided with slew gear;
Described jib is installed on slew gear, described jib is provided with jib lubbing mechanism and hoisting mechanism;
Described jib stage+module is at the head of jib;
Described crossing frame head is arranged on jib platform;
Be connected with the suspension hook on hoisting mechanism for manned hanging basket;
Described crossing frame also comprises the block device for block operation.
Further, described block device comprises load stay cord, monolithic coaster and guide rope, the quantity of described load stay cord is two, and described monolithic pulley suspension is arranged at the two ends of described crossing frame head, and one end of two described load stay cords is all connected with guide rope by monolithic coaster.
Further, described block device also comprises pull rope, and guide rope described in every root is provided with two pull ropes, described in every root, one end of pull rope is all connected with guide rope, and its other end is all fixedly installed on arm head platform.
Further, described first car body and the second car body are also provided with safety device, when described safety device starts, except the lifting action of hanging basket on described first car body and the second car body, all the other actions all stop.
Further, described safety device is installed in the control cabinl pulpit of described first car body and the second car body, and controls start and stop by the control switch in control cabinl pulpit, and the lifting action of hanging basket is preferential action with the remote controller operation that the operating personnel taking hanging basket carries.
Further, described first car body and the second car body are provided with the bracing or strutting arrangement for preventing jib posture from changing, described support is arranged between turntable and jib.
Further, described bracing or strutting arrangement comprises length-adjustable arm-tie, and described arm-tie one end is fixedly installed on turntable afterbody, and its other end is fixedly installed on jib afterbody.
Further, when the height of described leap thing is less than 36 meters, described crossing frame head does not arrange bracing wire link; Or, when the height of described leap thing is more than or equal to 36 meters, described crossing frame head is provided with bracing wire link.
Further, load stay cord described in every root hangs equally spacedly and is provided with multiple U-shaped ring, each described U-shaped ring lower end is linked with insulating rod, and the operating personnel on the second car body guides insulating rod into second car body from the first car body by pull rope.
On the other hand, the present invention also provides a kind of crossing frame construction method, comprises the following steps:
First car body and the second car body stop, to the both sides crossing over thing, to support vehicle frame respectively, and the tire of the first car body and the second car body departs from ground;
Jib, by jib lubbing mechanism and slew gear, is played width and returns back to the position being applicable to assembling arm head platform and crossing frame head by operating personnel;
Crossing frame head and arm head platform are assembled to jib head, after completing, control arm erects width, operate hoisting mechanism makes suspension hook drop down onto ground simultaneously, hanging basket is sling, having continued width to arm head platform is horizontal level, handles slew gear to will cross over direction, extends jib to will spanning height, after confirming correct position, hanging basket is put on ground or vehicle frame;
Operating personnel takes hanging basket and rises to crossing frame head position and carry out block operation.
Further, described block operation comprises the following steps:
Adopt unmanned vehicle or propeller-parachuting by the guide rope traction on the first car body to the second car body, guide rope is received by the operating personnel on the second car body, by the monolithic coaster of crossing frame head, extend to the ground of opposite side, land until load stay cord is guided to the second car body, after controlling load stay cord sag, then fix with Lever Blocks;
While operating personnel receives guide rope, pull rope is pulled to and is fixed on the second car body;
After the block end of job, regulate the tension force of load stay cord.
Further, described operating personnel takes hanging basket and rises to crossing frame head position to carry out block operation further comprising the steps of:
Operating personnel carries Digiplex and enters in hanging basket, handles hoisting mechanism and then realize the lift work of hanging basket by Digiplex, and now, except the lifting action of hanging basket on the first car body and the second car body, all the other actions all stop.
Further, further comprising the steps of before described block operation:
If cross over object height degree to be more than or equal to 36 meters, the cubic bracing wire connected is fixed on ground in advance on embedding good earth anchor;
If cross over object height degree to be less than 36 meters, this step is omitted.
Crossing frame of the present invention and construction method thereof, adopt the first car body and the second car body to instead of tradition and cross over support body, two car work compound, mechanized construction, fast construction can remove crossing frame, especially under 36 meters of spanning heights without the need to arranging bracing wire link, save activity time, simultaneously, operating personnel does not need by manually climbing upper crossing frame top, do not need to stand directly on arm head platform yet, rise with jib, but locate in crossing frame, after confirming safety, scheduling job personnel take this car and rise to operation on crossing frame head with the Special lifting hanging basket be with again, guarantee working security.
In further technical scheme, the present invention first car body and the second car body are also provided with safety device, ensure that operating personnel is to the uphill process of crossing frame and in crossing frame in operation process, car body does not produce all the other any dangerous plays except cage lifting action, ensure that the fail safe of operating personnel.
In further technical scheme, the present invention first car body and the second car body are also provided with the bracing or strutting arrangement for preventing jib posture from changing, ensure that crossing frame is when long working, can not occur because hydraulic pressure reveals that support body moves or the posture such as angle change changes phenomenon, cause block height change, and then cause accident.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the perspective view of crossing frame of the present invention;
Fig. 2 is the perspective view of crossing frame one state of the present invention;
Fig. 3 is the vertical view of Fig. 2;
Fig. 4 is the part-structure schematic diagram of Fig. 1;
Fig. 5 is the part-structure schematic diagram of Fig. 1.
Description of reference numerals
1 crossing frame, 2 arm head platform 3 jib
4 vehicle frame 5 hanging basket 6 hoisting mechanisms
7 load stay cord 8 monolithic coaster 9 guide ropes
10 pull rope 11U type ring 12 insulating rods
13 turntable 14 arm-tie 15 bearing pins
16 oil cylinder 17 first car body 18 second car bodies
19 cross over thing 20 cat ladder
Embodiment
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
As shown in Figures 1 to 5, a kind of crossing frame, comprise the first car body 17 and the second car body 18 being arranged at movably and crossing over thing 19 both sides, first car body 17 and the second car body 18 include crossing frame 1, vehicle frame 4, jib 3 and arm head platform 2, wherein, be provided with walking mechanism bottom vehicle frame 4, vehicle frame 4 is provided with slew gear; The afterbody of jib 3 is installed on slew gear, particularly, jib 3 comprises the joint arm that more piece connects successively, Telescopic movable between adjacent segments arm, and jib 3 is provided with jib lubbing mechanism and hoisting mechanism 6, vehicle frame 4 and jib 3 realize 360 ° by slew gear and turn round, and realize angular transformation by jib lubbing mechanism; Arm head platform 2 is arranged on the head of jib 3; Crossing frame 1 is arranged on arm head platform 2; Be connected with the suspension hook on hoisting mechanism 6 for manned hanging basket 5, drive lift rope, by suspension hook, hanging basket 5 is carried out oscilaltion by the hoist engine of hoisting mechanism 6; Crossing frame also comprises the block device for block operation; Aforementioned crossing frame also comprises cat ladder 20, and cat ladder 20 is fixedly connected with the joint arm of arm head platform 2 and least significant end.
It should be noted that, in the present invention when crossing over the height of thing 19 and being less than 36 meters, crossing frame 1 does not arrange bracing wire link; But when crossing over the height of thing 19 and being more than or equal to 36 meters, crossing frame 1 is also provided with bracing wire link.This bracing wire link comprises cubic bracing wire and cubic bracing wire utensil, and this cubic bracing wire is preferably connected to four Nodes of jib 3 arm head.
As shown in Figures 2 to 4, block device comprises load stay cord 7, monolithic coaster 8, guide rope 9 and pull rope 10, the quantity of load stay cord 7 is two, monolithic coaster 8 hangs the two ends being arranged at crossing frame 1, one end of two load stay cords 7 is all connected with guide rope 9 by monolithic coaster 8, every root guide rope 9 is provided with two pull ropes 10, one end of every root pull rope 10 is all connected with guide rope 9, and its other end is all fixedly installed on arm head platform 2.Simultaneously, every root load stay cord 7 hangs equally spacedly and is provided with multiple U-shaped ring 11, each U-shaped ring 11 lower end is linked with insulating rod 12, and the operating personnel on the second car body 18 guides insulating rod 12 into second car body 18 from the first car body 17 by pull rope 10, and then completes block operation.Such as insulating rod 12, load stay cord 7, the block materials such as guide rope 9 and pull rope 10 can directly be placed on crossing frame 1 and/or arm head platform 2, follow jib 3 width and rise to spanning height, can save transport of materials and promote the time.It should be noted that, load stay cord 7 is preferably steel wire rope, and pull rope 10 is nylon rope.
In addition, it is worth mentioning, first car body 17 and the second car body 18 are also provided with safety device, this safety device is installed in the control cabinl pulpit of the first car body 17 and the second car body 18, and control start and stop by the control switch in control cabinl pulpit, when this safety device starts, on first car body 17 and the second car body 18 except the lifting action of hanging basket 5, all the other actions all stop, but the remote controller that the operating personnel taking hanging basket 5 carries with also can control hanging basket 5 to be elevated, and the lifting action of hanging basket 5 is preferential action with the remote controller operation that the operating personnel taking hanging basket 5 carries.
In the present invention, aforementioned jib lubbing mechanism is preferably oil cylinder 16.As shown in Figure 5, turntable 13 and jib 3 come angle changing and hold mode by oil cylinder 16, but when placing for a long time, due to the reason of block load, oil cylinder 16 is let out in producing, the relative angle of turntable 13 and jib 3 can diminish, affect the relative position between crossing frame 1, cause block height change, and then generation accident, for this reason, in the present invention, the first car body 17 and the second car body 18 are also provided with the bracing or strutting arrangement for preventing jib 3 posture from changing, this support is arranged between turntable 13 and jib 3.As shown in Figure 5, bracing or strutting arrangement comprises length-adjustable arm-tie 14, and arm-tie 14 one end is fixedly installed on turntable 13 afterbody, and its other end is fixedly installed on jib 3 afterbody, and arm-tie 14 is provided with multiple adjustable distance hole, multiple adjustable distance hole is interfixed by bearing pin 15.
As shown in Figures 1 to 5, the first car body 17 and the second car body 18 are preferably autocrane.It should be noted that, other cranes are as rough-terrain crane, and full Terrain Cranes is also in protection scope of the present invention.
In order to further illustrate crossing frame of the present invention, present invention also offers a kind of crossing frame construction method, comprising the following steps:
First car body 17 and the second car body 18 stop the both sides to crossing over thing 19 respectively, and support vehicle frame 4, the tire of the first car body 17 and the second car body 18 all departs from ground;
Jib 3 width, by jib lubbing mechanism and slew gear, are returned back to the position being applicable to assembling arm head platform 2 and crossing frame 1 by operating personnel;
Crossing frame 1 and arm head platform 2 are assembled to jib 3 head, manipulation jib 3 width after completing, operate hoisting mechanism 6 makes suspension hook drop down onto ground simultaneously, hanging basket 5 is sling, continue width to arm head platform 2 in horizontal level, handled slew gear to crossing over direction, extend jib 3 to will spanning height, after confirming correct position, hanging basket 5 is put on ground or vehicle frame 4;
Operating personnel takes hanging basket 5 and rises to crossing frame 1 position and carry out block operation.
Particularly, described block operation comprises the following steps:
Unmanned vehicle or propeller-parachuting is adopted to draw to the second car body 18 by the guide rope 9 on the first car body 17, guide rope 9 is received by the operating personnel on the second car body 18, by the monolithic coaster 8 of crossing frame 1, extend to the ground of opposite side, land until load stay cord 7 to be guided to the second car body 18, after controlling load stay cord 7 sag, then fix with Lever Blocks;
While operating personnel receives guide rope 9, pull rope 10 is pulled to and is fixed on the second car body 18;
After the block end of job, regulate the tension force of load stay cord 7.
It should be noted that, when abovementioned steps controls load stay cord 7 sag, Angle ambiguity is no more than 60 degree over the ground.
Described operating personnel takes hanging basket 5 and rises to crossing frame 1 position to carry out block operation further comprising the steps of:
Operating personnel carries Digiplex and enters in hanging basket 5, handles hoisting mechanism 6 and then realize the lift work of hanging basket 5 by Digiplex, and now, except the lifting action of hanging basket 5 on the first car body 17 and the second car body 18, all the other actions all stop.
Further comprising the steps of before described block operation:
If cross over thing 19 be highly more than or equal to 36 meters, the cubic bracing wire connected is fixed on ground in advance on embedding good earth anchor;
If cross over thing 19 be highly less than 36 meters, this step is omitted.
In sum, crossing frame provided by the invention and construction method thereof, tool has the following advantages:
1. adopt the first car body 17 and the second car body 18 to replace tradition to cross over support body, two car work compound, mechanized construction, easy to operate, construction flexibly, less and save operation duration on peripheral facilities impact.
2. adopt safety device to ensure that operating personnel in crossing frame uphill process and in crossing frame in operation process, first car body 17 and the second car body 18 do not produce all the other any dangerous plays except hanging basket 5 lifting action, ensure that the safety of operating personnel.
3. adopt bracing or strutting arrangement, ensure that crossing frame is when long working, do not occur because hydraulic pressure reveals that support body moves or the posture such as angle change changes phenomenon, cause block height change and cause the generation of accident.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. a crossing frame, it is characterized in that, comprise the first car body (17) and the second car body (18) that are arranged at movably and cross over thing (19) both sides, described first car body (17) and the second car body (18) include crossing frame head (1), vehicle frame (4), jib (3) and arm head platform (2), wherein
Described vehicle frame (4) bottom is provided with walking mechanism, and (4) are provided with slew gear with described vehicle frame;
Described jib (3) is installed on slew gear, described jib (3) is provided with jib lubbing mechanism and hoisting mechanism (6);
Described arm head platform (2) is arranged on the head of jib (3);
Described crossing frame head (1) is arranged on arm head platform (2);
Be connected with the suspension hook on hoisting mechanism (6) for manned hanging basket (5);
Described crossing frame also comprises the block device for block operation.
2. crossing frame according to claim 1, it is characterized in that, described block device comprises load stay cord (7), monolithic coaster (8) and guide rope (9), the quantity of described load stay cord (7) is two, the suspension of described monolithic coaster (8) is arranged at the two ends of described crossing frame head (1), and one end of two described load stay cords (7) is all connected with guide rope (9) by monolithic coaster (8).
3. crossing frame according to claim 2, it is characterized in that, described block device also comprises pull rope (10), guide rope (9) described in every root is provided with two pull ropes (10), described in every root, one end of pull rope (10) is all connected with guide rope (9), and its other end is all fixedly installed on arm head platform (2).
4. crossing frame according to any one of claim 1 to 3, it is characterized in that, described first car body (17) and the second car body (18) are also provided with safety device, when described safety device starts, except the lifting action of hanging basket (5) on described first car body (17) and the second car body (18), all the other actions all stop.
5. crossing frame according to claim 4, it is characterized in that, described safety device is installed in the control cabinl pulpit of described first car body (17) and the second car body (18), and controlling start and stop by the control switch in control cabinl pulpit, the lifting action of hanging basket (5) is preferential action with the remote controller operation that the operating personnel taking hanging basket (5) carries.
6. crossing frame according to any one of claim 1 to 3, it is characterized in that, described first car body (17) and the second car body (18) are provided with the bracing or strutting arrangement for preventing jib (3) posture from changing, described support is arranged between turntable (13) and jib (3).
7. crossing frame according to claim 6, it is characterized in that, described bracing or strutting arrangement comprises length-adjustable arm-tie (14), described arm-tie (14) one end is fixedly installed on turntable (13) afterbody, and its other end is fixedly installed on jib (3) afterbody.
8. crossing frame according to claim 1, is characterized in that, when the height of described leap thing (19) is less than 36 meters, described crossing frame head (1) does not arrange bracing wire link; Or, when the height of described leap thing (19) is more than or equal to 36 meters, described crossing frame head (1) is provided with bracing wire link.
9. crossing frame according to claim 3, it is characterized in that, load stay cord (7) described in every root hangs equally spacedly and is provided with multiple U-shaped ring (11), each described U-shaped ring (11) lower end is linked with insulating rod (12), and the operating personnel on the second car body (18) guides insulating rod (12) into the second car body (18) from the first car body (17) by pull rope (10).
10. a crossing frame construction method, is characterized in that, comprises the following steps:
First car body (17) and the second car body (18) stop the both sides to crossing over thing (19) respectively, support vehicle frame (4), the tire of the first car body (17) and the second car body (18) all departs from ground;
Jib (3), by jib lubbing mechanism and slew gear, is played width and returns back to the position being applicable to assembling arm head platform (2) and crossing frame head (1) by operating personnel;
Crossing frame head (1) and arm head platform (2) are assembled to jib (3) head, after completing, manipulation jib (3) plays width, operate hoisting mechanism (6) makes suspension hook drop down onto ground simultaneously, hanging basket (5) is sling, continue width to arm head platform (2) in horizontal level, handle slew gear to direction will be crossed over, extend jib (3) to will spanning height, after confirming correct position, hanging basket (5) is put on ground or vehicle frame (4);
Operating personnel takes hanging basket (5) and rises to crossing frame head (1) position and carry out block operation.
11. crossing frame construction methods according to claim 10, is characterized in that, described block operation comprises the following steps:
Adopt unmanned vehicle or propeller-parachuting by guide rope (9) traction on the first car body (17) to the second car body (18), guide rope (9) is received by the operating personnel on the second car body (18), by the monolithic coaster (8) of crossing frame head (1), extend to the ground of opposite side, land until load stay cord (7) is guided to the second car body (18), after controlling load stay cord (7) sag, then fix with Lever Blocks;
While operating personnel receives guide rope (9), pull rope (10) is pulled to and is fixed on the second car body (18);
After the block end of job, regulate the tension force of load stay cord (7).
12. crossing frame construction methods according to claim 10, is characterized in that, described operating personnel takes hanging basket (5) and rises to crossing frame head (1) position to carry out block operation further comprising the steps of:
Operating personnel carries Digiplex and enters in hanging basket (5), handle hoisting mechanism (6) by Digiplex and then realize the lift work of hanging basket (5), now, except the lifting action of hanging basket (5) on first car body (17) and the second car body (18), all the other actions all stop.
13. crossing frame construction methods according to claim 10, is characterized in that, further comprising the steps of before described block operation:
If cross over thing (19) be highly more than or equal to 36 meters, the cubic bracing wire connected is fixed on ground in advance on embedding good earth anchor;
If cross over thing (19) be highly less than 36 meters, this step is omitted.
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| CN201510687603.8A CN105226560B (en) | 2015-10-21 | 2015-10-21 | A kind of crossing frame and its construction method |
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| CN201510687603.8A CN105226560B (en) | 2015-10-21 | 2015-10-21 | A kind of crossing frame and its construction method |
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| CN105226560A true CN105226560A (en) | 2016-01-06 |
| CN105226560B CN105226560B (en) | 2018-05-22 |
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| CN106159793A (en) * | 2016-07-21 | 2016-11-23 | 安徽华电工程咨询设计有限公司 | A kind of quickly transition assembled is from lifting crossing frame |
| CN106451200A (en) * | 2016-07-01 | 2017-02-22 | 浙江浙电经济技术研究院 | London tower bridge type non-powercut spanning system and spanning method of power transmission line |
| CN109038364A (en) * | 2018-08-08 | 2018-12-18 | 安徽送变电工程有限公司 | A kind of fast reserve crossover device for transmission line of electricity crossing construction |
| CN109494621A (en) * | 2018-12-29 | 2019-03-19 | 国家电网有限公司 | Transmission line of electricity block device |
| CN110282509A (en) * | 2019-07-23 | 2019-09-27 | 广东电网有限责任公司 | A kind of electric power network leap wiring winding integrated apparatus |
| CN110492391A (en) * | 2019-09-16 | 2019-11-22 | 杨平 | Jacking type full protection crossing frame and its building method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106451200A (en) * | 2016-07-01 | 2017-02-22 | 浙江浙电经济技术研究院 | London tower bridge type non-powercut spanning system and spanning method of power transmission line |
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| CN109038364A (en) * | 2018-08-08 | 2018-12-18 | 安徽送变电工程有限公司 | A kind of fast reserve crossover device for transmission line of electricity crossing construction |
| CN109494621A (en) * | 2018-12-29 | 2019-03-19 | 国家电网有限公司 | Transmission line of electricity block device |
| CN109494621B (en) * | 2018-12-29 | 2020-05-15 | 国家电网有限公司 | Power transmission line blocking device |
| CN110282509A (en) * | 2019-07-23 | 2019-09-27 | 广东电网有限责任公司 | A kind of electric power network leap wiring winding integrated apparatus |
| CN110492391A (en) * | 2019-09-16 | 2019-11-22 | 杨平 | Jacking type full protection crossing frame and its building method |
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| CN105226560B (en) | 2018-05-22 |
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