CN108425320A - A kind of removing method of bridge deck protecting wall blibbing - Google Patents
A kind of removing method of bridge deck protecting wall blibbing Download PDFInfo
- Publication number
- CN108425320A CN108425320A CN201810500009.7A CN201810500009A CN108425320A CN 108425320 A CN108425320 A CN 108425320A CN 201810500009 A CN201810500009 A CN 201810500009A CN 108425320 A CN108425320 A CN 108425320A
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- China
- Prior art keywords
- model
- concrete
- bridge deck
- protecting wall
- blibbing
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Classifications
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/10—Railings; Protectors against smoke or gases, e.g. of locomotives; Maintenance travellers; Fastening of pipes or cables to bridges
- E01D19/103—Parapets, railings ; Guard barriers or road-bridges
-
- 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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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
It includes step that the present invention, which discloses a kind of removing method of bridge deck protecting wall blibbing,：Bar-mat reinforcement in bridge deck protecting wall model and the model is placed by design requirement；Infusion funnel is arranged above the model, and equipped with the concrete for meeting design requirement in the infusion funnel；Operating ambient temperature is controlled within the scope of 10~35 DEG C；The concrete is perfused into the model and mechanical oscillation and manual cleaning operation are carried out to the concrete in the model；Concrete surface is smoothed out after vibration, pays attention to filling out side fillet；The removing method of bridge deck protecting wall blibbing of the present invention is using artificial clear operation when pouring, manually it is close to the method for the model template and concrete surface movement using the plate in concreting, interior formwork quantity can effectively be controlled, hence it is evident that improve the presentation quality of the bridge deck protecting wall and straight wall.
Description
Technical field
The present invention relates to building engineering fields, and in particular to a kind of removing method of bridge deck protecting wall blibbing.
Background technology
High-speed railway bridge floor system it is attached construction be entire high ferro construction an important component, the quality of quality,
The speed of progress directly affects the related work in later stage.But since it is few with respect to quantities, works size is small, and technology contains
Amount is not high, and is despised by part administrative staff, so that blibbing occur in protecting wall, AB straight walls in the construction of high-speed railway bridge surface system
The problems such as, presentation quality is extremely influenced, or even be difficult to meet acceptance condition, and the secondary repairing after constructing causes economic loss,
It is ineffective after repairing, while the peeling for repairing fragment is easily caused in follow-up high ferro operation and is seriously affected.
Because high-speed railway bridge surface system protecting wall and straight wall are small size concrete structure, but the displaying of its exposed concrete area compared with
Greatly, and its inside configuration reinforcing bar is intensive, when concrete construction, often occurs vibrating insufficient, causes appearance air blister defect, give
Successive projects, which are delivered for a check, causes difficulty；Secondary repairing is taken easily to leave security risk to later stage operation.
The existing Normal practice for eliminating appearance air blister defect, which mostly uses, to be improved concrete performance, improves template release agent matter
Amount, concreting in lifts, reinforcement vibrating spear vibrate, though the generation of exhibiting high surface bubble is inhibited to a certain extent,
It is from the point of view of the present situation of construction site, bubble elimination is not thorough, and does not solve air blister defect problem fundamentally；Simultaneously because of bridge deck
Protecting wall, straight wall are smaller in equal volume, and template face is small and structure reinforcing bars are intensive, cause attached vibrator not install effectively, machine
Tool vibrates difficulty.
In view of drawbacks described above, creator of the present invention obtains the present invention finally by prolonged research and practice.
Invention content
To solve above-mentioned technological deficiency, the technical solution adopted by the present invention is, provides a kind of bridge deck protecting wall surface
The removing method of bubble, including step：
Bar-mat reinforcement in S1, bridge deck protecting wall model and the model is placed by design requirement；The bridge deck protection
All built-in fittings of wall are placed by design requirement, and the model template surface that the built-in fitting is secured to position is closely connected；Described
Model bottom is disposed with vibrating bottom device, and plate vibrator is placed on the model template；
Infusion funnel is arranged above the model S2, and equipped with the concrete for meeting design requirement in the infusion funnel；
S3, control operating ambient temperature is within the scope of 10~35 DEG C；
The concrete is perfused into the model and carries out mechanical oscillation and artificial to the concrete in the model by S4
Cleaning operation；
S5 smoothes out concrete surface after vibration, pays attention to filling out side fillet.
Preferably, the manual cleaning operation is specially to use plate contact surface between the model template and concrete
It is inserted into the model, the plate is close to the model template and is moved up and down, and same clear position moves repeatedly 2 to 3
After secondary, move to next clear position until completing the cleaning operation of the model template entirety.
Preferably, the mechanical oscillation include pre- vibration and vibration eventually；The pre- vibration processes are to be mixed in the model
The perfusion for coagulating soil, opens the vibrating bottom device of the model bottom；When bottom shakes power deficiency, from the top of the model to
Vibrating head is inserted into concrete to be vibrated, each vibrating head should be inserted to the model bottom, when vibration the vibrating head
All built-in fittings in the model and the bar-mat reinforcement are not hit；It is vibrated to the concrete surface no longer effervescent, table
Face bleeding and without it is notable sink subject to；The end vibration processes are the plate vibrator in the model template being vertically arranged
Outboard vibrations, to ensure the concrete compaction of corner and the built-in fitting periphery in the model；And by the concrete surface
Catch up with densification real and leveling, cause surface bleeding and without stone it is exposed subject to.
Preferably, the manual cleaning operation setting is after the completion of being in the concreting, and the mechanical oscillation
After, before concrete initial set.
Preferably, the plate includes movable plate and supporting rod, the movable plate is connected with the supporting rod, the movement
Contact surface and joint face is respectively set in plate, and the supporting rod is fixedly connected on the joint face；When the manual cleaning operation,
The mobile plate surface is close to the model template.
Preferably, the movable plate uses prismatic steel plate, the prismatic steel plate length of side to be set as 10cm, thickness is set as
8mm；The supporting rod is set as cylindrical type, and using the plain bar of model Φ 12, length is set as 100cm.
Preferably, the supporting rod includes interior bar and outer bar, the outer bar is set as hollow-core construction, and the outer bar is socketed in
Outside the interior bar, and the interior bar and the outer bar can relatively move, and described outer bar one end is fixed on the movable plate.
Preferably, external screw thread is arranged in the interior rod outer surface, internal thread, the interior bar and institute is arranged in the outer bar inner surface
It states outer bar to connect with the external screw thread by the internal thread, the relative rotation of the interior bar and the outer bar adjusts the interior bar
With the relative position of the outer bar.
Preferably, the interior bar is additionally provided with locating piece, the locating piece is provided with internal thread, and the locating piece and institute
It states interior bar to be connected through a screw thread, the locating piece can act against the port position of the outer bar.
Preferably, the locating piece is set as the nut being arranged in pairs.
Compared with the prior art the beneficial effects of the present invention are：Bridge deck protecting wall blibbing of the present invention disappears
Except method is using artificial clear operation when pouring, the model template is manually close to using the plate in concreting
With the method for concrete surface movement, interior formwork quantity can be effectively controlled, hence it is evident that improve the bridge deck protection
The presentation quality of wall and straight wall.
Description of the drawings
Fig. 1 is the constructing structure figure of the bridge deck protecting wall blibbing removing method；
Fig. 2 is the structure chart of the plate；
Fig. 3 is the structure chart of the supporting rod.
Digital representation in figure：
1- model templates；2- plates；3- concrete；21- movable plates；22- supporting rods；23- interior bars；24- outer bars；25- is fixed
Position part.
Specific implementation mode
Below in conjunction with attached drawing, the forgoing and additional technical features and advantages are described in more detail.
Embodiment one
The removing method of bridge deck protecting wall blibbing of the present invention includes step：
S1, installation before being perfused：
Bar-mat reinforcement in bridge deck protecting wall model and the model is placed by design requirement；The bridge deck protecting wall
All built-in fittings are placed by design requirement, and the model template surface that must be secured to position is closely connected, is not allow for gap
In the presence of；It is disposed with vibrating bottom device in model bottom, plate vibrator is placed on the model template 1；
Infusion funnel is arranged above the model S2, and equipped with the concrete for meeting design requirement in the infusion funnel
3；
S3, control operating ambient temperature is within the scope of 10~35 DEG C；
The concrete 3 is perfused into the model and carries out mechanical oscillation and people to the concrete 3 in the model by S4
Work cleaning operation；
Step S4 specifically,
Perfusion：The concrete 3 being loaded into the infusion funnel is fed into the model；
The mechanical oscillation include pre- vibration and vibration eventually；
Pre- vibration：It is shaken the bottom of using while perfusion and top auxiliary is shaken the vibratory process of combination, i.e., in the model
The vibrating bottom device of the model bottom is opened in the perfusion of concrete 3；When bottom shakes power deficiency, from the upper of the model
Portion is inserted into vibrating head into concrete 3 and is vibrated, and each vibrating head should be inserted to the model bottom, when vibration described in shake
Dynamic stick not hit all built-in fittings and the bar-mat reinforcement in the model；3 surface of the concrete is vibrated to no longer to steam
Bubble, surface bleeding and without it is notable sink subject to.
Vibration eventually：The plate vibrator is in 1 outboard vibrations of the model template being vertically arranged, to ensure the model
The concrete 3 on interior corner and the built-in fitting periphery is closely knit；And catch up with densification real and leveling on 3 surface of the concrete, cause surface
Bleeding and without stone it is exposed subject to；
As shown in FIG. 1, FIG. 1 is the constructing structure figures of the bridge deck protecting wall blibbing removing method；Manual cleaning：
It is inserted into the model with 3 contact surface of concrete along the model template 1 using plate 2 and is close to the model template 1 and carried out
It moves up and down, same clear position is movable to next clear position until completing the pattern die after moving repeatedly 2 to 3 times
The whole cleaning operation of plate 1；
S5 smoothes out 3 surface of concrete, pays attention to filling out side fillet after vibration.
In the pre- vibration operation, the vibrating head is inserted into once every 0.15~0.25 meter or so, vibrates 26 every time
~35 seconds.
After summer smoothes out 3 surface of concrete, 3 surface of concrete is covered in time, avoids that 3 quick dehydration of concrete is made to make
At dry and cracked.
The bridge deck protecting wall pours completion in the model, places the reinforcing bar in the model and the model
Net after-pouring ensures the structure size and intensity of the bridge deck protecting wall after construction；All built-in fittings are by setting in the model
Meter requires to place correctly, and the model surface that must be secured to position is closely connected, gap presence is not allow for, to reduce
State the generation in built-in fitting and 1 contact surface of the model template bubble or gap in casting process；The vibrating bottom device and institute
Stating the setting of surface vibrator, to ensure that the bridge deck protecting wall concrete 3 is perfused closely knit and smooth.It is operated by manual cleaning
Described in plate 2 movement, destroy concrete 3 blibbing and the model template 1, the concrete 3 cohesive force, to
Realize the discharge of the blibbing.
The appropriate location above the model is arranged in heretofore described infusion funnel, and the general infusion funnel is away from the mould
The height of type is 1m or so；The concrete 3 mixed and stirred by design requirement, should will be described before being packed into the infusion funnel
Infusion funnel is inside and outside to be cleaned out, and the moistening infusion funnel inner wall of spraying water；The concrete 3 is fed into from the infusion funnel
When in the model, staff pays attention to controlling the swing of the infusion funnel, to ensure uniform blanking, and ensures safety, simultaneously
Discharge quantity will appropriateness, the concrete 3 after vibration of being subject to flushes the model top surface.
The present invention control operating ambient temperature within the scope of 10~35 DEG C, be in order to ensure the various performances of concrete 3, with
And quality and technical indicator after the completion of the bridge deck protecting wall.
Manual cleaning operation should be arranged and after mechanical oscillation, being mixed after the completion of the concrete 3 pours
Before 3 initial sets of solidifying soil.
The removing method of bridge deck protecting wall blibbing of the present invention is using artificial clear operation when pouring, mixed
Manually it is close to the method for the model template 1 and concrete surface movement when solidifying soil pours using the plate 2, can effectively controls
Interior formwork quantity processed, hence it is evident that improve the presentation quality of the bridge deck protecting wall and straight wall.
The removing method of bridge deck protecting wall blibbing of the present invention significantly reduces the corpusculums such as high ferro protecting wall, straight wall
The air blister defect of product concrete, is greatly improved Surface Quality of Concrete；The bridge deck protecting wall of bubble-free defect is conducive to complete
Industry and traffic is tested, while the security risk for avoiding repair layer obscission caused by secondary repairing from being buried to follow-up operation stage.
Embodiment two
As shown in Fig. 2, Fig. 2 is the structure chart of the plate；The plate 2 includes movable plate 21 and supporting rod 22, described
Movable plate 21 and the supporting rod 22 connect, and the movable plate 21 preferably uses prismatic steel plate, the prismatic plate size optional
Select length of side 10cm, thickness 8mm；The supporting rod 22 is preferably arranged to cylindrical type, and the plain bar of model Φ 12, length can be used
100cm may be selected, it also can be determines according to actual conditions.Preferably, contact surface and joint face is respectively set in the movable plate 21, institute
Supporting rod 22 is stated to be fixedly connected on the joint face.
When the manual cleaning operates, the model template 1 is close on 21 surface of the movable plate, i.e., the described contact surface and
1 abutting contact of the model template, when the movable plate 21 moves up and down, the supporting rod 22 is fixed on the joint face
On, the supporting rod 22 forms bulge-structure on the joint face, in 2 moving process of the plate, the movable plate 21
Edge and the bulge-structure are contacted with the concrete 3, and are generated stirring and vibrated effect, to be easy to the concrete
Bubble on 3 surfaces is removed.
22 length of the supporting rod is set according to the bridge deck protecting wall dimensional structure, specifically, the supporting rod 22
Length generally uses 100cm, and convenient for carrying out bubble processing to 3 surface of concrete of small size structure, the supporting rod 22 is long
Easily cause the force difficulty during user's manual cleaning.
The present embodiment carries out bilateral welding using the prismatic steel plate and the round steel, convenient for improving the whole of the plate 2
Body stability.Being provided with conducive to 3 resistance of concrete during the plate 2 moves up and down is reduced for the prismatic steel plate, it is convenient
Long-time operation.Be conducive to reduce between the supporting rod 22 and concrete 3 using round steel connection and bond frictional force, subtracts
Few operation difficulty.The plate 2 is made using the prismatic steel plate and the round steel, easy to operate, the plate 2 makes
Simply, cost-effective.
The plate 2 in the present embodiment is suitable for 3 cast-in-place connection structure of small-size concrete, because of 1 face of the model template
Smaller, the intensive situation of structure reinforcing bars of product can not use the mechanical concrete vibrating mode situation such as installation attached vibrator.
Embodiment three
Embodiment three is further improved on the basis of embodiment two, thes improvement is that, the supporting rod 22 is set
It is set to telescopic rod, by setting the supporting rod 22 to stretching structure, the adjusting to 22 length of the supporting rod is realized, is convenient for
Adjusting of the user to the position in the model of the plate 2.
As shown in figure 3, Fig. 3 is the structure chart of the supporting rod；In the present embodiment, the supporting rod 22 includes 23 He of interior bar
Outer bar 24, the outer bar 24 are set as hollow-core construction, and the outer bar 24 is socketed in outside the interior bar 23, and 23 He of the interior bar
The outer bar 24 can relatively move, and the outer bar 24 is welded on the movable plate 21, by adjusting the interior bar 23 and described
The relative position of outer bar 24, you can adjust the length of the supporting rod 22.
Preferably, external screw thread is arranged in 23 outer surface of the interior bar, internal thread, the interior bar is arranged in 24 inner surface of the outer bar
23 are connected by the internal thread with the external screw thread with the outer bar 24, pass through the opposite of the interior bar 23 and the outer bar 24
Rotation, you can realize the adjusting of the relative position of the interior bar 23 and the outer bar 24.
Preferably, the interior bar 23 is additionally provided with locating piece 25, the locating piece 25 is provided with internal thread, and the positioning
Part 25 and the interior bar 23 are connected through a screw thread, and after the completion of the interior bar 23 and 24 relative position of the outer bar are adjusted, are passed through
The locating piece 25 is rotated, the locating piece 25 is acted against to the port position of the outer bar 24, to realize the outer bar 24
With the fixation of 23 relative position of the interior bar.
Preferably, the locating piece 25 is set as the nut being arranged in pairs, by the setting of the nut, will be close to described
The nut of outer bar 24 acts against the port position of the outer bar 24, and the screw thread that will be far from the outer bar 24 is acted against close to institute
It states on the nut of outer bar 24, by using between frictional force, the nut and the screw thread between two nuts
Frictional force to realize the fixation of 23 relative position of the outer bar 24 and the interior bar.
By the flexible setting of the supporting rod 22, the plate 2 in the present embodiment is applicable to larger concrete 3
Cast-in-place connection structure, addition uses the manual cleaning of the plate 2 on the basis of by the mechanical oscillation, to thoroughly disappear
Except the bubble on 3 surface of concrete.
The foregoing is merely presently preferred embodiments of the present invention, is merely illustrative for the purpose of the present invention, and not restrictive
's.Those skilled in the art understand that in the spirit and scope defined by the claims in the present invention many changes can be carried out to it,
It changes or even equivalent, but falls in protection scope of the present invention.
Claims (10)
1. a kind of removing method of bridge deck protecting wall blibbing, which is characterized in that including step：
Bar-mat reinforcement in S1, bridge deck protecting wall model and the model is placed by design requirement；The bridge deck protecting wall
All built-in fittings are placed by design requirement, and the model template surface that the built-in fitting is secured to position is closely connected；In the model
Bottom is disposed with vibrating bottom device, and plate vibrator is placed on the model template；
Infusion funnel is arranged above the model S2, and equipped with the concrete for meeting design requirement in the infusion funnel；
S3, control operating ambient temperature is within the scope of 10~35 DEG C；
The concrete is perfused into the model and carries out mechanical oscillation and manual cleaning to the concrete in the model by S4
Operation；
S5 smoothes out concrete surface after vibration, pays attention to filling out side fillet.
2. the removing method of bridge deck protecting wall blibbing as described in claim 1, which is characterized in that the manual cleaning
Operation is specially that contact surface is inserted into the model between the model template and concrete using plate, and the plate is close to
The model template moves up and down, and after same clear position moves repeatedly 2 to 3 times, moves straight to next clear position
To the cleaning operation for completing the model template entirety.
3. the removing method of bridge deck protecting wall blibbing as described in claim 1, which is characterized in that the mechanical oscillation
Including vibrating and vibrating eventually in advance；The pre- vibration processes are the perfusion with the model inner concrete, open the model bottom
The vibrating bottom device；When bottom shakes power deficiency, vibrating head is inserted into concrete from the top of the model and is vibrated,
Each vibrating head should be inserted to the model bottom, when vibration the vibrating head not hit it is all pre-buried in the model
Part and the bar-mat reinforcement；Be vibrated to the concrete surface no longer effervescent, surface bleeding and without it is notable sink subject to；The end
Vibration processes be the plate vibrator in the model template outboard vibrations being vertically arranged, to ensure corner in the model
With the concrete compaction on the built-in fitting periphery；And catch up with densification real and leveling the concrete surface, cause surface bleeding and nothing
Subject to stone is exposed.
4. the removing method of bridge deck protecting wall blibbing as described in claim 1, which is characterized in that the manual cleaning
Operation setting is after the completion of being in the concreting, and after the mechanical oscillation, before concrete initial set.
5. the removing method of bridge deck protecting wall blibbing as claimed in claim 2, which is characterized in that the plate includes
Movable plate and supporting rod, the movable plate are connected with the supporting rod, and contact surface and joint face is respectively set in the movable plate, institute
Supporting rod is stated to be fixedly connected on the joint face；When the manual cleaning operation, the mobile plate surface is close to the model
Template.
6. the removing method of bridge deck protecting wall blibbing as claimed in claim 5, which is characterized in that the movable plate is adopted
With prismatic steel plate, the prismatic steel plate length of side is set as 10cm, and thickness is set as 8mm；The supporting rod is set as cylindrical type, adopts
With the plain bar of model Φ 12, length is set as 100cm.
7. the removing method of bridge deck protecting wall blibbing as claimed in claim 5, which is characterized in that the supporting rod packet
Interior bar and outer bar are included, the outer bar is set as hollow-core construction, and the outer bar is socketed in outside the interior bar, and the interior bar and institute
Stating outer bar can relatively move, and described outer bar one end is fixed on the movable plate.
8. the removing method of bridge deck protecting wall blibbing as claimed in claim 7, which is characterized in that the interior bar appearance
Face is arranged external screw thread, and the outer bar inner surface is arranged internal thread, the interior bar and the outer bar and passes through the internal thread and described
External screw thread connects, and the relative rotation of the interior bar and the outer bar adjusts the relative position of the interior bar and the outer bar.
9. the removing method of bridge deck protecting wall blibbing as claimed in claim 8, which is characterized in that the interior bar is also set
It is equipped with locating piece, the locating piece is provided with internal thread, and the locating piece and the interior bar are connected through a screw thread, the positioning
Part can act against the port position of the outer bar.
10. the removing method of bridge deck protecting wall blibbing as claimed in claim 9, which is characterized in that the locating piece
It is set as the nut being arranged in pairs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810500009.7A CN108425320A (en) | 2018-05-23 | 2018-05-23 | A kind of removing method of bridge deck protecting wall blibbing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810500009.7A CN108425320A (en) | 2018-05-23 | 2018-05-23 | A kind of removing method of bridge deck protecting wall blibbing |
Publications (1)
| Publication Number | Publication Date |
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| CN108425320A true CN108425320A (en) | 2018-08-21 |
Family
ID=63163958
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| CN201810500009.7A Pending CN108425320A (en) | 2018-05-23 | 2018-05-23 | A kind of removing method of bridge deck protecting wall blibbing |
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| CN204139611U (en) * | 2014-10-10 | 2015-02-04 | 中天西北建设投资集团有限公司 | The construction work instrument eliminating concrete bubble |
| CN104947939A (en) * | 2015-05-05 | 2015-09-30 | 中国铁建大桥工程局集团有限公司 | High-frequency concrete vibration system and high-frequency vibration control device |
| CN107090777A (en) * | 2017-06-02 | 2017-08-25 | 国家电网公司 | A kind of T beam manufacture methods for reducing blibbing |
| CN107604818A (en) * | 2017-08-01 | 2018-01-19 | 傅国锋 | One kind, which has, vacuumizes function bridge concrete formwork for placing |
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2018
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2004339809A (en) * | 2003-05-16 | 2004-12-02 | Noboru Iwasaki | Mounting form for concrete structure |
| CN204139611U (en) * | 2014-10-10 | 2015-02-04 | 中天西北建设投资集团有限公司 | The construction work instrument eliminating concrete bubble |
| CN104947939A (en) * | 2015-05-05 | 2015-09-30 | 中国铁建大桥工程局集团有限公司 | High-frequency concrete vibration system and high-frequency vibration control device |
| CN107090777A (en) * | 2017-06-02 | 2017-08-25 | 国家电网公司 | A kind of T beam manufacture methods for reducing blibbing |
| CN107604818A (en) * | 2017-08-01 | 2018-01-19 | 傅国锋 | One kind, which has, vacuumizes function bridge concrete formwork for placing |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20190412 Address after: 230031 No. 20 Tianda Road, Hefei High-tech Zone, Anhui Province Applicant after: China Railway Beijing Engineering Bureau Group Urban Rail Transit Engineering Co., Ltd. Applicant after: Beijing Railway Engineering Bureau Group Co., Ltd. Address before: 230088 No. 20 Tianda Road, Hefei High-tech Zone, Anhui Province Applicant before: China Railway Beijing Engineering Bureau Group Urban Rail Transit Engineering Co., Ltd. |
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Application publication date: 20180821 |
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