CN110184954B - Bridge prestressed body outer cable dismantling method - Google Patents
Bridge prestressed body outer cable dismantling method Download PDFInfo
- Publication number
- CN110184954B CN110184954B CN201910620200.XA CN201910620200A CN110184954B CN 110184954 B CN110184954 B CN 110184954B CN 201910620200 A CN201910620200 A CN 201910620200A CN 110184954 B CN110184954 B CN 110184954B
- Authority
- CN
- China
- Prior art keywords
- steel strand
- jack
- steel
- dismantling
- prestressed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to a method for dismantling a prestressed external cable of a bridge, which comprises the steps of taking down a clamping piece at a fixed end in the dismantling process, and adopting a mode of pulling and dismantling the clamping piece one by one steel strand after single lengthening to avoid overlarge pulling pressure due to the existence of concrete bond strength, thereby effectively avoiding the occurrence of overlarge pressure on an anchoring area when the whole bundle is pulled out and avoiding the damage to the anchoring area; when the steel strand is pulled out from the tensioning end, a method of stretching a certain length one by one is adopted, so that the steel strand slides to be separated from the bond stress of concrete, and then the whole bundle of steel strands is pulled out together.
Description
Technical Field
The invention relates to the field of bridge prestress, in particular to a bridge prestress body outer cable dismantling method.
Background
The bridge span structure is a bridge constructed by adopting prestressed concrete. The bridge can make the concrete be pre-stressed before loading by using the reaction force of the pretension of the steel bars or steel wires (cables). No tensile stress occurs during the operation stage (called fully prestressed concrete), or there is tensile stress without cracks or cracks within the allowable width are controlled.
The clamping piece anchoring steel strand is a fixed mode of tensioning and fixing the steel strand to an anchorage device by the clamping pieces at two ends of the steel strand, in order to protect a prestress assembly (comprising the steel strand, the anchorage device and the like), after tensioning is completed, concrete can be poured into a cable guide pipe and a sealing cylinder generally, the steel strand and the anchorage device are protected against corrosion, the service life is prolonged, a protective cover can be sleeved on an anchor head, concrete is filled or grease is injected into the protective cover, and the protective effect of corrosion is achieved. Under certain conditions, the external cable on the bridge needs to be replaced, at the moment, the external cable fixed on the bridge needs to be removed firstly, the sealing cylinder and the cable guide pipe are filled with concrete, the steel strand, the sealing cylinder and the cable guide pipe are integrated, if the steel strand is pulled out in a whole bundle pulling-out mode, the whole bundle of tensioning and pulling-out force is larger than the tensioning force of the original external cable due to the existence of the grip force of the concrete, and the local stress of the concrete in an anchoring area is easy to cause cracking in the pulling-out process.
Therefore, a new method for dismantling the prestressed outer cable of the bridge is needed, and the concrete local stress in the anchoring area is not too large to crack due to too large withdrawal force in the dismantling process.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a bridge prestressed body outer cable dismantling method, which reduces the pulling force in the process of pulling out the whole bundle of steel strands and avoids the danger of cracking caused by overlarge local stress of concrete in an anchoring area due to overlarge pulling force.
The purpose of the invention is realized by the following technical scheme:
a bridge prestressed body outer cable dismantling method is used for dismantling a prestressed body outer cable on a bridge, the prestressed body outer cable comprises a tensioning end and a fixed end, and the bridge prestressed body outer cable dismantling method is characterized by comprising the following steps:
s1, removing the protective covers at the two ends of the external cable, chiseling the concrete wrapped on the anchor heads at the two ends of the external cable, and exposing the anchor heads;
s2, removing the clamping piece at the fixed end:
s21, selecting one of the steel stranded wires with the exposed fixed end, and connecting the tool steel stranded wire with the selected steel stranded wire by using a steel stranded wire connector for lengthening;
s22, penetrating the tool steel strand in the step S21 through a jack for connection and fixation, and erecting a supporting seat, wherein one end of the supporting seat abuts against the end face of the anchor backing plate at the fixed end, and the other end of the supporting seat supports the jack;
s23, starting a jack, pulling a single steel strand by pulling the tool steel strand through the jack, loosening and withdrawing a clamping piece on the steel strand at a fixed end, releasing the steel strand after removing the clamping piece to enable the steel strand to retract to a stress-free state, and removing the tool steel strand and the steel strand connector;
s24, selecting another steel strand of which the clamping piece is not removed at the fixed end, and repeating the steps S21 to S23;
s25, repeating the step S24 until all the clamping pieces on the steel strands at the fixed end are removed;
s3 weakening the bond strength of concrete
S31, selecting one of the steel stranded wires with the exposed tensioning end, and connecting the tool steel stranded wire with the selected steel stranded wire by using a steel stranded wire connector for lengthening;
s32, connecting and fixing the tool steel strand in the step S31 through a jack, and erecting a supporting seat, wherein one end of the supporting seat abuts against the end face of the anchor backing plate at the tensioning end, and the other end of the supporting seat supports the jack;
s33, starting a jack, pulling the single steel strand by pulling the tool steel strand through the jack, pulling out the single steel strand by more than 50cm, weakening the bond stress of concrete on the steel strand, releasing the steel strand to enable the steel strand to retract to a stress-free state, and detaching the tool steel strand and the steel strand connector;
s34, selecting another steel strand which is not pulled out at the tensioning end, and repeating the steps S31 to S33;
s35, repeating the step S34 until all the steel strands are tensioned and pulled out once;
and S4, drawing the whole bundle of steel strands from the tensioning end by using a jack.
Further, after step S4, the sealing cylinders at both ends of the external cable are pulled out, and the concrete in the cable guide pipe is removed.
Preferably, in step S1, the specific method for removing the protective covers at the two ends of the outer cable is to cut open the protective covers by oxygen cutting so as to expose the concrete inside the protective covers.
Preferably, in step S33, the jack used is a 240Q jack, and the pulling force is 5-6T.
Preferably, in step S33, the pull-out length of the single strand is 60-70 cm.
Preferably, in step S4, the jack used for pulling out the whole bundle of steel strands from the tensioning end is a through jack.
Preferably, the steel stranded wire connectors in steps S21 and S31 are both single steel stranded wire connectors.
Preferably, the single steel stranded wire connector comprises a connecting nut, the left end and the right end of the connecting nut are respectively provided with an external thread, the left end and the right end of the connecting nut are respectively in threaded connection with a single-hole anchor plate, the two single-hole anchor plates are arranged in a bilateral symmetry manner, each single-hole anchor plate is internally provided with a taper hole, and a tool clamping piece for clamping a steel stranded wire is arranged in each taper hole.
Preferably, the supporting seat in step S22 has the same structure as the supporting seat in step S32, and the supporting seat includes a plurality of supporting pillars and two backing rings, and two ends of each supporting pillar are respectively connected to the two backing rings.
Preferably, in steps S22 and S32, the supporting base and the jack are directly padded with an anchor plate, and the tool steel strand passes through a through hole in the anchor plate to be connected with the jack.
The invention has the following beneficial effects: the invention relates to a method for dismantling a prestressed external cable of a bridge, which comprises the steps of taking down a clamping piece at a fixed end in the dismantling process, and adopting a mode of pulling and dismantling the clamping piece one by one steel strand after single lengthening to avoid overlarge pulling pressure due to the existence of concrete bond strength, thereby effectively avoiding the occurrence of overlarge pressure on an anchoring area when the whole bundle is pulled out and avoiding the damage to the anchoring area; when the steel strand is pulled out from the tensioning end, a method of stretching a certain length one by one is adopted, so that the steel strand moves to be separated from the bond stress of concrete, and then the whole bundle of steel strands is pulled out together.
Drawings
FIG. 1 is a schematic structural diagram of a prestressed external cable of a bridge to be removed in an embodiment;
FIG. 2 is a schematic view of the construction of the fixing end in the embodiment;
FIG. 3 is a schematic construction diagram of the tension end in the embodiment;
FIG. 4 is a cross-sectional schematic view of a single steel strand connector in an embodiment;
fig. 5 is a schematic structural view of the support seat in the embodiment.
Description of the specific structure: the device comprises a fixed end 1, a tension end 2, a stranded wire 31, an anchor backing plate 32, a cable guide pipe 33, a protective cover 34, a sealing barrel 35, a supporting seat 4, a backing ring 41, a supporting column 42, an anchor plate 5, a jack 6, a stranded wire connector 7, a connecting nut 71, a single-hole anchor plate 72, a taper hole 721, a tool clamping piece 73 and a stranded wire 8.
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are given in the accompanying drawings.
A bridge prestressed body outer cable dismantling method is used for dismantling a prestressed body outer cable on a bridge, the prestressed body outer cable comprises a tensioning end 2 and a fixed end 1, and the bridge prestressed body outer cable dismantling method is characterized by comprising the following steps:
s1, removing the protective covers 34 at the two ends of the external cable, chiseling the concrete wrapped on the anchor heads at the two ends of the external cable, and exposing the anchor heads;
s2, referring to fig. 2, the clip of the fixed end 1 is removed:
s21, selecting one of the steel strands 31 with the exposed fixed end 1, and connecting the tool steel strand 8 with the selected steel strand 31 for lengthening by using a connector of the steel strand 31;
s22, connecting and fixing the tool steel strand 8 in the step S21 through a jack 6, erecting a supporting seat 4, wherein one end of the supporting seat 4 abuts against the end face of the anchor backing plate 32 of the fixed end 1, and the other end supports the jack 6;
s23, starting the jack 6, wherein the jack 6 pulls the single steel strand 31 by pulling the tool steel strand 8 to loosen and withdraw the clamping piece on the steel strand at the fixed end, when the clamping piece is loosened but does not automatically fall off, the clamping piece can be pried out by a screwdriver, after the clamping piece is disassembled, the steel strand 31 is released to enable the steel strand 31 to retract to a non-stress state, and the tool steel strand 8 and the steel strand connector 7 are disassembled; among the jacks 6 selected for tensioning the single steel strands, front-clamping jacks are preferred,
s24, selecting another steel strand 31 of which the clamping piece is not removed at the fixed end 1, and repeating the steps S21 to S23;
s25, repeating the step S24 until all the clamping pieces on the steel strand 31 of the fixed end 1 are removed, and then carrying out the following steps;
s3, referring to FIG. 3, the bond strength of the concrete is weakened
S31, selecting one of the steel stranded wires 31 with the exposed tensioning end, and connecting the tool steel stranded wire 8 with the selected steel stranded wire 31 for lengthening by using the steel stranded wire connector 7;
s32, the tool steel strand 8 in the step S31 penetrates through a jack 6 to be connected and fixed, a supporting seat 4 is erected, one end of the supporting seat 4 abuts against the end face of an anchor backing plate of the tensioning end 2, and the other end supports the jack 6;
s33, starting the jack 6, pulling the single steel strand 31 by the jack 6 through pulling the tool steel strand 8, pulling the single steel strand 31 out by more than 50cm, weakening the bond stress of concrete on the steel strand 31, releasing the steel strand 31 to enable the steel strand to retract to a stress-free state, and detaching the tool steel strand 8 and the steel strand connector 7;
s34, selecting another steel strand which is not pulled out at the tensioning end, and repeating the steps S31 to S33;
s35, repeating the step S34 until all the steel strands are tensioned and pulled out once;
and S4, drawing the whole bundle of steel strands from the tensioning end by using a jack. Preferably, the jack used for pulling out the whole bundle of steel strands from the tensioning end by the jack is a through jack.
Further, after step S4, the sealing cylinders 35 at both ends of the external cable are pulled out, and the concrete in the cable guide 33 is removed.
Preferably, in step S1, the specific method for removing the protective covers at the two ends of the outer cable is to cut open the protective covers by oxygen cutting so as to expose the concrete inside the protective covers. The oxygen cutting equipment is simple, flexible and convenient, is suitable for cutting materials with large thickness, and is suitable for the embodiment.
Preferably, in step S33, the jack used is a 240Q jack, and the pulling force is 5-6T.
Preferably, in step S33, the pull-out length of the single strand is 60-70 cm.
Preferably, in step S4, the jack used for pulling out the whole bundle of steel strands from the tensioning end is a through jack.
Preferably, the steel stranded wire connector 7 in step S21 and step S31 are both single steel stranded wire connectors.
Preferably, the single steel stranded wire connector comprises a connecting nut 71, the left end and the right end of the connecting nut 71 are respectively provided with an external thread, the left end and the right end of the connecting nut 71 are respectively in threaded connection with a single-hole anchor plate 72, the two single-hole anchor plates 72 are arranged in bilateral symmetry, each single-hole anchor plate 72 is internally provided with a tapered hole 721, and a tool clamping piece 73 for clamping a steel stranded wire is arranged in each tapered hole 721. When the tool is used, the connecting nut 71 is detached, the steel strand 31 and the tool steel strand 8 penetrate into the taper holes of the two single-hole anchor plates 72 respectively, the tool clamping pieces 73 are sleeved on the connecting nut 71, the two single-hole anchor plates 72 are connected together by using the connecting nut 71, and the clamping pieces are contracted and clamped by stretching the steel strand 31 and the tool steel strand 8.
Preferably, in step S22, the supporting seat has the same structure as the supporting seat in step S32, and the supporting seat 4 includes a plurality of supporting pillars 42 and two backing rings 41, and two ends of each supporting pillar 42 are respectively connected to the two backing rings 41. Preferably, the material of preparation supporting seat 4 is steel, and this supporting seat 4's simple structure supports intensity height, is applicable to this embodiment.
Preferably, in steps S22 and S32, the supporting base and the jack are directly padded with an anchor plate 5, and the tool steel strand passes through a through hole in the anchor plate to be connected with the jack. Anchor slab 5 is current instrument, and convenient for draw materials is swift, and intensity is high, and the through-hole that originally opens on anchor slab 5 allows instrument steel strand wires to pass just, is applicable to this embodiment.
The above description is only a preferred embodiment of the present invention, but not intended to limit the scope of the invention, and all simple equivalent changes and modifications made in the claims and the description of the invention are within the scope of the invention.
Claims (10)
1. A bridge prestressed body outer cable dismantling method is used for dismantling a prestressed body outer cable on a bridge, the prestressed body outer cable comprises a tensioning end and a fixed end, and the bridge prestressed body outer cable dismantling method is characterized by comprising the following steps:
s1, removing the protective covers at the two ends of the external cable, chiseling the concrete wrapped on the anchor heads at the two ends of the external cable, and exposing the anchor heads;
s2, removing the clamping piece at the fixed end:
s21, selecting one of the steel stranded wires with the exposed fixed end, and connecting the tool steel stranded wire with the selected steel stranded wire by using a steel stranded wire connector for lengthening;
s22, penetrating the tool steel strand in the step S21 through a jack for connection and fixation, and erecting a supporting seat, wherein one end of the supporting seat abuts against the end face of the anchor backing plate at the fixed end, and the other end of the supporting seat supports the jack;
s23, starting a jack, pulling a single steel strand by pulling the tool steel strand through the jack, loosening and withdrawing a clamping piece on the steel strand at a fixed end, releasing the steel strand after removing the clamping piece to enable the steel strand to retract to a stress-free state, and removing the tool steel strand and the steel strand connector;
s24, selecting another steel strand of which the clamping piece is not removed at the fixed end, and repeating the steps S21 to S23;
s25, repeating the step S24 until all the clamping pieces on the steel strands at the fixed end are removed;
s3 weakening the bond strength of concrete
S31, selecting one of the steel stranded wires with the exposed tensioning end, and connecting the tool steel stranded wire with the selected steel stranded wire by using a steel stranded wire connector for lengthening;
s32, connecting and fixing the tool steel strand in the step S31 through a jack, and erecting a supporting seat, wherein one end of the supporting seat abuts against the end face of the anchor backing plate at the tensioning end, and the other end of the supporting seat supports the jack;
s33, starting a jack, pulling the single steel strand by pulling the tool steel strand through the jack, pulling out the single steel strand by more than 50cm, weakening the bond stress of concrete on the steel strand, releasing the steel strand to enable the steel strand to retract to a stress-free state, and detaching the tool steel strand and the steel strand connector;
s34, selecting another steel strand which is not pulled out at the tensioning end, and repeating the steps S31 to S33;
s35, repeating the step S34 until all the steel strands are tensioned and pulled out once;
and S4, drawing the whole bundle of steel strands from the tensioning end by using a jack.
2. The method for dismantling the prestressed external cable of the bridge according to claim 1, wherein: after step S4, the sealing cylinders at both ends of the external cable are pulled out, and the concrete in the cable guide pipe is removed.
3. The method for dismantling the prestressed external cable of the bridge according to claim 1, wherein: in step S1, the specific method of removing the protective covers at both ends of the outer cable is to cut open the protective covers by oxygen cutting so as to expose the concrete inside the protective covers.
4. The method for dismantling the prestressed external cable of the bridge according to claim 1, wherein: in step S33, the jack used is a 240Q jack, and the drawing force is 5-6T.
5. The method for dismantling the prestressed external cable of the bridge according to claim 4, wherein: in step S33, the pull-out length of the single steel strand is 60-70 cm.
6. The method for dismantling the prestressed external cable of the bridge according to claim 1, wherein: in step S4, the jack used for pulling out the entire bundle of steel strands from the tensioning end is a through jack.
7. The method for dismantling the prestressed external cable of the bridge according to claim 1, wherein: the steel stranded wire connectors in the steps S21 and S31 are both single steel stranded wire connectors.
8. The method for dismantling the prestressed external cable of the bridge according to claim 7, wherein: the single steel strand connector comprises a connecting nut, wherein external threads are respectively arranged at the left end and the right end of the connecting nut, the left end and the right end of the connecting nut are respectively in threaded connection with a single-hole anchor plate, the two single-hole anchor plates are arranged in a bilateral symmetry mode, each single-hole anchor plate is internally provided with a taper hole, and a tool clamping piece used for clamping a steel strand is arranged in each taper hole.
9. The method for dismantling the prestressed external cable of the bridge according to claim 1, wherein: step S22 is the same as the supporting seat in step S32, the supporting seat includes a plurality of supporting pillars and two backing rings, and two ends of each supporting pillar are respectively connected to the two backing rings.
10. The method for dismantling the prestressed external cable of the bridge according to claim 9, wherein: in steps S22 and S32, an anchor plate directly pads the supporting base and the jack, and the tool steel strand passes through a through hole in the anchor plate to be connected with the jack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910620200.XA CN110184954B (en) | 2019-07-10 | 2019-07-10 | Bridge prestressed body outer cable dismantling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910620200.XA CN110184954B (en) | 2019-07-10 | 2019-07-10 | Bridge prestressed body outer cable dismantling method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110184954A CN110184954A (en) | 2019-08-30 |
| CN110184954B true CN110184954B (en) | 2020-10-02 |
Family
ID=67725673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910620200.XA Active CN110184954B (en) | 2019-07-10 | 2019-07-10 | Bridge prestressed body outer cable dismantling method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110184954B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111188286B (en) * | 2020-01-13 | 2021-04-30 | 上海悍马建筑科技有限公司 | Method for disassembling bonded prestressed carbon fiber plate |
| CN114960482A (en) * | 2022-06-20 | 2022-08-30 | 保利长大工程有限公司 | Method for safely and efficiently removing external prestress |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008095400A (en) * | 2006-10-12 | 2008-04-24 | Zenitaka Corp | Diagonal cable removal method |
| CN104372738B (en) * | 2014-10-30 | 2016-06-01 | 柳州欧维姆机械股份有限公司 | Rope constructional method is changed in a kind of single replaceable anchor heavy stone used as an anchor prestress anchoraging device and installation thereof |
| CN104746442B (en) * | 2015-04-17 | 2016-08-24 | 柳州欧维姆工程有限公司 | For changing the withdrawing steel wire of the old suspension rod of arched bridge pre-stressed boom and hole cleaning device assembly and the method removed for old suspension rod thereof |
| CN108166491B (en) * | 2017-12-06 | 2020-08-04 | 苏州市能工基础工程有限责任公司 | Method for dismantling steel strand in anchor cable |
| CN109736213B (en) * | 2018-12-29 | 2024-04-05 | 柳州欧维姆机械股份有限公司 | Tool for quickly replacing clamping piece group anchor type steel strand inhaul cable and dismantling construction method thereof |
-
2019
- 2019-07-10 CN CN201910620200.XA patent/CN110184954B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110184954A (en) | 2019-08-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109736213B (en) | Tool for quickly replacing clamping piece group anchor type steel strand inhaul cable and dismantling construction method thereof | |
| CN110184954B (en) | Bridge prestressed body outer cable dismantling method | |
| JP2010261150A (en) | Method for stretching tendon | |
| JP5597443B2 (en) | Construction method of PC structure | |
| JP4847805B2 (en) | Cable laying method | |
| JP7355644B2 (en) | How to adjust the tension of PC steel materials | |
| KR200209297Y1 (en) | Retensioning device of prestressed structure | |
| CN215104614U (en) | Improved type easy-to-unload anchor clamping piece device for prestressed steel strand temporary stay cable | |
| CN111962509B (en) | Prestress monitoring anchor rod structure and tensioning method | |
| CN113235441A (en) | Strand penetrating device and method for prestressed steel strand | |
| CN112392041A (en) | Tensioning device for insufficient reserved length of steel strand and application method thereof | |
| CN108168870B (en) | Device and method suitable for testing fatigue performance of anchor connector | |
| KR20010054810A (en) | Apparatus to restrain prestress structure | |
| CN214061603U (en) | Tensioning device for insufficient reserved length of steel strand | |
| CN220117196U (en) | Anchor device capable of being quickly removed when large tensioning locking force is applied | |
| CN219033795U (en) | Anchor backing device for prestress tension releasing | |
| CN219080304U (en) | Hook clamping piece type anchorage device for anchor cable repair tensioning extension | |
| CN210820172U (en) | Tool cable for pre-tensioning method | |
| CN219343166U (en) | External thread stop anchorage device for anchor cable repair and stretch extension | |
| CN213951976U (en) | Quick installation device of prestressing force clamping piece | |
| CN114197337B (en) | Anchoring structure capable of replacing tie rod and connector of anchorage anchoring system and construction method | |
| CN114934451B (en) | Dismantling method of steel strand stay cable with steering cable saddle | |
| CN114592695B (en) | The upper end of the steel strand bundle Anchor installation method | |
| CN116717031A (en) | Novel prestress steel strand Zhang Tuimao releasing device and using method thereof | |
| CN219410846U (en) | Internal thread stop anchorage device for anchor cable repair and stretch extension |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Fang Jianhai Inventor after: Guo Zemian Inventor after: Li Ying Inventor after: Liu Zihui Inventor before: Fang Jianhai Inventor before: Guo Zemian Inventor before: Li Ying Inventor before: Liu Zihui |
|
| CB03 | Change of inventor or designer information | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 510080 20th floor, JIAYE building, 318 Dongfeng Middle Road, Yuexiu District, Guangzhou City, Guangdong Province Patentee after: Guangzhou Beihuan Intelligent Transportation Technology Co.,Ltd. Address before: 510080 20th floor, JIAYE building, 318 Dongfeng Middle Road, Yuexiu District, Guangzhou City, Guangdong Province Patentee before: GUANGZHOU NORTH RING SUPER HIGHWAY Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |