CN102733321A - Suspension bracket system for existing bridge reinforcing and building method of suspension bracket system - Google Patents
Suspension bracket system for existing bridge reinforcing and building method of suspension bracket system Download PDFInfo
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- CN102733321A CN102733321A CN2012102476013A CN201210247601A CN102733321A CN 102733321 A CN102733321 A CN 102733321A CN 2012102476013 A CN2012102476013 A CN 2012102476013A CN 201210247601 A CN201210247601 A CN 201210247601A CN 102733321 A CN102733321 A CN 102733321A
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- 239000000725 suspension Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000003014 reinforcing effect Effects 0.000 title abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 37
- 229910052742 iron Inorganic materials 0.000 claims description 18
- 238000005728 strengthening Methods 0.000 claims description 10
- 239000002023 wood Substances 0.000 claims description 8
- 241000282326 Felis catus Species 0.000 claims description 7
- 210000001699 lower leg Anatomy 0.000 claims description 7
- 239000010426 asphalt Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 11
- 238000012423 maintenance Methods 0.000 description 9
- 238000009434 installation Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
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- 238000004891 communication Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
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Abstract
The invention provides a suspension bracket system for existing bridge reinforcing and a building method of the suspension bracket system. The system comprises a wing plate, a suspension rod (1), a cross beam (2) and a scaffold plate (3), wherein the wing plate passes through an I-shaped beam (9) through a bridge deck (7); one end of the suspension rod is fixedly arranged on the bridge deck (7) and the other end of the suspension rod is suspended below the bridge deck (7); the cross beam (2) is fixedly connected with the other end of the suspension rod (1); and the scaffold plate (3) is paved along the longitudinal direction of the bridge deck (7) in a manner of supporting by using a cross beam (2). The suspension bracket system has a simple structure; and the suspension bracket system does not influence traffic on the bridge deck and below the bridge when the bridge is maintained. The construction method of the suspension bracket system is rapid and convenient and does not cause traffic stop.
Description
Technical field
The present invention relates to a kind of pipe-hanging hook system, the pipe-hanging hook system is used in particularly a kind of existing bridge strengthening.The invention still further relates to the building method of this pipe-hanging hook system.
Background technology
Along with developing rapidly of China's traffic transport industry; The highway bridge construction development is swift and violent; Except that having built in each metropolis a large amount of viaduct and bridge crossing; Also built up high pier stud bridge and cross a river, bridge spanning the sea in remote mountain areas and leap location, river, China has been world's bridge second big country at present.In the wildness of change that faces the developing by leaps and bounds of highway communication flow, bridge design standard and overload limit for tonnage vehicle, existing bridge is faced with heavy maintenance and management task.
Diseases such as downwarp, crack, concrete spalling, corrosion of steel bar can take place at the bottom of its beam, thereby need safeguard and reinforcement the bridge that disease is arranged under action of long-term load in bridge.Before reinforcing at the bottom of to beam, what at first will do is to set up interim operation platform.Yet, be that to set up platform be unusual difficulty for city cross-line, cross a river or the area of crossing over the mountain valley in the bridge bottom.
For the city bridge crossing, general way is to set up support by track under the bridge at present.Yet this can take track under the bridge for a long time, disturbs road traffic under the bridge.
For over strait, stream crossing bridge, general at present employing floating drum or ship are set up support as temporary platform.But this difficulty of construction is big, high, the poor stability of expense, and influences the current of river course.
For the viaduct of crossing over the mountain valley, can build movably interim operation platform by crash bearer usually.But the working area that this platform provides is little, causes long construction period, can't satisfy the purpose of quick reinforcement bridge.
Prior art discloses several kinds of interim operation platforms that are suspended under the bridge, and the use of these platforms does not influence up and down road traffic of bridge, do not influence the transportation in river course.CN201144397Y discloses a kind of suspention working platform that is used for bridge inspection and maintenance, and this platform is the integrated member that is assembled into the steel component truss, and through the wire rope suspensioning of pontic both sides, the constructor stands on the working platform and constructs during use.Though this working platform is simple in structure, cheap, the working area that platform provided is very little, influences speed of application.
US3708038 discloses a kind of cantilever support, and it comprises: job platform, confession constructor pass in and out the Vertical Channel of platform and are used for after the constructor passes in and out platform, making platform to keep the cantilever of balance.This cantilever support in use; Catch on the suspension apparatus that is fixed on the passage top by full circle crane; Support is hung in the below of bridge; The constructor upwards swings to touch the root edge of bridge i beam platform through certain operation after getting into platform, couples together with the root edge of the pawl on the platform with platform and i beam again, just can carry out the maintenance work of bridge bottom then.This cantilever support uses flexible, and crane is driven to the relevant position that bridge need be safeguarded, the constructor just can get into platform and begin maintenance work.But when the more constructor of needs safeguarded bridge in a big way simultaneously, this cantilever support obviously can't satisfy the demands.
US2001/0037914A1 discloses a kind of braced structures that can working face displaceably be suspended in the bridge bottom.This braced structures comprises: a plurality of clamps at the clip of the i beam root edge of bridge, be installed in the pair of tracks on the clip and a pair of scaffold member below track of dangling.Two root edges that are installed in adjacent two i beams respectively of said pair of tracks.Scaffold member comprises: the guide groove of lengthwise, be arranged on roller in the guide groove, be fixed on guide groove and from guide groove towards the suspender belt that extends below, be connected in the suspension rod of suspender belt and be connected in suspension rod and horizontally extending crossbeam between suspension rod.Working platform is supported on the crossbeam, thereby can be along with the surperficial in orbit rolling of roller along slide.In this application, because track has been carried out special adaptations, so working platform can slide along the root edge of a plurality of continuous i beams reposefully.Although have above-mentioned advantage, the work plane that the working platform that this braced structures supported can provide is smaller, only limits to the zone between the adjacent continuous i beam of two rows.
Therefore the existing operation platform that is used for bridge inspection and maintenance can not satisfy in to maintenance works such as existing bridge strengthenings, uninterrupted traffic again, and many-sided requirement such as can complete fast.
Summary of the invention
The technical problem that the present invention will solve provides a kind of interim operation platform that existing bridge is safeguarded fast of under the situation that does not influence traffic under bridge floor and the bridge, being used on a large scale.
In order to solve the problems of the technologies described above, the present invention provides a kind of existing bridge strengthening to use the pipe-hanging hook system, and this system comprises: suspension rod, and it penetrates the wing plate of i beam from bridge floor, and an end is fixed on said bridge floor, and the other end is suspended in said bridge floor below; Crossbeam, it is fixedly connected with the said other end of said suspension rod; And scaffold floor, it is with the vertical laying along said bridge floor of the mode that supports with said crossbeam.
The present invention also provides the building method of a kind of existing bridge strengthening with the pipe-hanging hook system, and this method may further comprise the steps: remove bridge floor and wait the asphalt surface course in site of holing, and get out the hole of the wing plate that penetrates i beam; Suspension rod is passed said hole, so that the one of which end is fixed on said bridge floor, the other end is suspended in said bridge floor below; Crossbeam is fixedly connected with the said other end of said suspension rod; And with the mode that supports with said crossbeam with the vertical laying of scaffold floor along said bridge floor.
Pipe-hanging hook system of the present invention has advantage of simple structure, and system is mainly born working load and dead load when construction.And, the bang path of load be from the scaffold floor to the crossbeam again to suspension rod, this design before for construction is provided convenience: the load of scaffold floor and crossbeam calculates according to simply supported beam, and the load of suspension rod passes through crossbeam to its reaction force, with the axial tension component computing.
The operation platform that pipe-hanging hook system of the present invention is provided is suspended to the bridge below, therefore when using pipe-hanging hook system of the present invention to carry out bridge inspection and maintenance work, can not influence the traffic under bridge floor and the bridge.
The building method of pipe-hanging hook system of the present invention has advantage quickly and easily, is the operation of simple and regular like punching, tying up bar, installation crossbeam, laying scaffold floor etc.And, after the maintenance scheme of bridge is confirmed, can required members such as suspension rod, crossbeam be processed by required size in advance, this can accelerate the progress of engineering again greatly.
When utilizing the building method of pipe-hanging hook system of the present invention, if rationally divide the works area, sealing half range bridge floor construction earlier, half range is normally current in addition, treat that suspension rod installs after, exchange enclosed area and FOH, then can realize the not purpose of interruption of bridge deck traffic.
Description of drawings
Fig. 1 schematically shows the sectional drawing of a specific embodiment of pipe-hanging hook system of the present invention along bridge lateral.
Fig. 2 is the flow chart when utilizing the specific embodiment of the building method of pipe-hanging hook system of the present invention to carry out bridge strengthening.
Fig. 3 is when utilizing specific embodiment of building method of pipe-hanging hook system of the present invention, bridge deck traffic is led the sketch map of an instance that changes.
The specific embodiment
In order to understand the present invention better, combine specific embodiment explanation the present invention of the present invention at present.This specific embodiment only is used to technical scheme of the present invention is described, and non-limiting the present invention.
Fig. 1 shows the sectional drawing of a specific embodiment of pipe-hanging hook system of the present invention along bridge lateral.As can be seen from the figure, this pipe-hanging hook system comprises: suspension rod 1, and it penetrates the wing plate of i beam 9 from bridge 7, and an end is fixed on bridge 7, and the other end is suspended in bridge 7 belows; Crossbeam 2, it is fixedly connected with the end that suspension rod 1 is suspended in bridge floor 7 belows; And scaffold floor 3, it is with the vertical laying along bridge floor 7 of the mode that supports with crossbeam 2.Suspension rod 1, crossbeam 2 and the scaffold floor 3 that connects in a manner described just constituted the operation platform that is suspended to the bridge below.
Flow chart when the specific embodiment that Fig. 2 has provided the building method that utilizes pipe-hanging hook system of the present invention is carried out bridge strengthening.In the preparation of construction stage, the constructor can prepare construction machinery, equipment and material, processes each member of building the pipe-hanging hook system on request, for example, goes out screw thread etc. at an end car of suspension rod 1.
In order to build pipe-hanging hook system shown in Figure 1, what at first will do is to get out the hole 6 that supplies suspension rod 1 to pass at bridge 7, should lead the traffic of bridge 7 earlier to change for this reason.Fig. 3 shows to bridge 7 traffic and leads an instance that changes.Specific practice is, along the width of bridge the road surface is divided into works area and driving district.The transition section of 100m is set in the place ahead, works area, and the rear is provided with the transition section of 50m.After in the works area, accomplishing bridge 7 borings and penetrating suspension rod 1, then open works area, and driving district is before become the works area.
For the boring step shown in Fig. 2, particularly be to remove bridge floor 7 to wait the asphalt surface course in site of holing, and get out the hole 6 of the wing plate that penetrates i beam 9.The available core-drilling machine of holing is accomplished.
After treating that boring is accomplished, what next will do is that preprepared suspension rod 1 is passed hole 6.For the end with suspension rod 1 stably is fixed on bridge floor 7, can be after suspension rod 1 pass the wing plate of i beam 9, be screwed in advance on the screw thread that the end car at suspension rod 1 goes out with nut, suspension rod 1 is fixed on bridge floor 7.After treating that all suspension rods 1 all are fixed on bridge floor 7 with nut, with pitch backfill hole 6.
After all suspension rods 1 all installed, an end that crossbeam 2 and suspension rod 1 is suspended in bridge floor 7 belows was fixed together.Crossbeam 2 can be used bolt with suspension rod 1, should bore the hole in the appropriate location of crossbeam 2 for this reason.Treat all crossbeams 2 all after laterally the installing of bridge floor 7, can be along bridge floor 7 vertically on crossbeam 2, lay scaffold floor 3.In order to obtain more firm operation platform, when laying scaffold floor 3, load-bearing lumps of wood (not shown) can be set below scaffold floor 3, should overlap between the load-bearing lumps of wood and the scaffold floor 3, both should be not less than certain value, for example 50mm at the length of overlap joint.In addition, scaffold floor 3 should have certain thickness, and 50mm for example is can bear enough working load.According to " building operations reckoner ", the desirable 2.0kN/mm of working load
2
Through after the above-mentioned boring shown in Fig. 2, penetrating suspension rod, installation crossbeam and lay the step of scaffold floor, just formed the operation platform that is suspended to the bridge below.
It can also be seen that from Fig. 1 the pipe-hanging hook system of this specific embodiment also comprises the i iron 4 of encorbelmenting of the side bar 8 that is installed in bridge.The mode that the i iron 4 of encorbelmenting is installed at side bar 8 does not limit especially, for example can on side bar 8, hole, and the fastening means of using always with bolt, rivet etc. the again i iron 4 of will encorbelmenting is fixed on the side bar 8.The encorbelment purpose of i iron 4 of installation is in order to enlarge the above-mentioned width that is suspended to the operation platform of bridge below.Specific practice is: second suspension rod 1 ' is installed in the i iron 4 of encorbelmenting, so that an end of second suspension rod 1 ' is fixed on the i iron 4 of encorbelmenting, the other end is suspended in the below of side bar 8; An end that second crossbeam 2 ' and second suspension rod 1 ' is suspended in side bar 8 belows is fixed; Lay crus secunda palm 3 ' along vertically going up of bridge floor 7 at second crossbeam 2 '.After the operation platform that is suspended to bridge below is widened, not only increase working area, and can make things convenient under the constructor Xiang Qiao on the bridge and transport material, also can make things convenient for the constructor under the bridge to receive the material on the bridge.
It can also be seen that from Fig. 1 the pipe-hanging hook system of this specific embodiment also comprises the cat ladder 5 that is installed in the i iron 4 of encorbelmenting, an end of cat ladder 5 is fixed on the i iron 4 of encorbelmenting, and the other end is positioned at side bar 8 belows.The further convenient construction personnel of the installation of cat ladder 5 pass in and out on the bridge with bridge under.
As shown in Figure 2, after the pipe-hanging hook system that completion one is striden is built, just can begin next as stated and stride building of pipe-hanging hook system.Certainly, if the restriction of the number of not constructed also can be carried out building of multispan pipe-hanging hook system simultaneously.Respectively striding after the pipe-hanging hook system all builds completion, just can with the pairing operation platform that is suspended to below the bridge of whole bridge floor area on begin bridge such as is reinforced at maintenance work.Reinforcement is carried out according to " highway bridge strengthening construction technical specification " JTG/TJ23-2008 and relevant criterion.
Need to prove,, the invention is not restricted to this specific embodiment although the above use specific embodiment has been explained the present invention.Those skilled in the art can carry out various modifications, replacement or improvement to the present invention within the spirit and scope of the present invention.Protection scope of the present invention is as the criterion with claims.
Claims (10)
1. the pipe-hanging hook system is used in an existing bridge strengthening, and it comprises:
Suspension rod (1), it penetrates the wing plate of i beam (9) from bridge floor (7), and an end is fixed on said bridge floor (7), and the other end is suspended in said bridge floor (7) below;
Crossbeam (2), its said other end with said suspension rod (1) is fixedly connected; And
Scaffold floor (3), it is with the vertical laying along said bridge floor (7) of the mode that supports with said crossbeam (2).
2. pipe-hanging hook system according to claim 1 is characterized in that, the below of said scaffold floor (3) is provided with the load-bearing lumps of wood with its overlap joint.
3. pipe-hanging hook system according to claim 1; It is characterized in that; The i iron of encorbelmenting (4) that also comprises the side bar (8) that is installed in bridge; The said i iron of encorbelmenting (4) is equipped with second suspension rod (1 '), and an end of said second suspension rod (1 ') is fixed on the said i iron of encorbelmenting (4), and the other end is suspended in the below of said side bar (8); The said other end of said second suspension rod (1 ') is fixedly connected with second crossbeam (2 '), is equipped with on said second crossbeam (2 ') along the crus secunda palm (3 ') of the longitudinal extension of said bridge floor (7).
4. pipe-hanging hook system according to claim 3 is characterized in that, the said i iron of encorbelmenting (4) also is equipped with cat ladder (5), and an end of said cat ladder (5) is fixed on the said i iron of encorbelmenting (4), and the other end is positioned at the below of said side bar (8).
5. according to claim 3 or 4 described pipe-hanging hook systems, it is characterized in that the below of said crus secunda palm (3 ') is provided with the second load-bearing lumps of wood with its overlap joint.
6. an existing bridge strengthening is with the building method of pipe-hanging hook system, and it may further comprise the steps:
Remove bridge floor (7) and wait the asphalt surface course in site of holing, and get out the hole (6) of the wing plate that penetrates i beam (9);
Suspension rod (1) is passed said hole (6), so that the one of which end is fixed on said bridge floor (7), the other end is suspended in said bridge floor (7) below;
The said other end of crossbeam (2) with said suspension rod (1) is fixedly connected; And
With the mode that supports with said crossbeam (2) with the vertical laying of scaffold floor (3) along said bridge floor (7).
7. the building method of pipe-hanging hook system according to claim 6; It is characterized in that; Also comprise the steps: when laying said scaffold floor (3), the load-bearing lumps of wood to be set, and make said scaffold floor (3) and said load-bearing lumps of wood overlap joint in the below of said scaffold floor (3).
8. the building method of pipe-hanging hook system according to claim 6 is characterized in that, also comprises the steps:
Side bar (8) at bridge is installed the i iron (4) of encorbelmenting;
Second suspension rod (1 ') is installed to the said i iron of encorbelmenting (4), so that an end of said second suspension rod (1 ') is fixed on the said i iron of encorbelmenting (4), the other end is suspended in the below of said side bar (8);
The said other end of second crossbeam (2 ') with said second suspension rod (1 ') is fixedly connected; And
With the mode that supports with said second crossbeam (2 ') with the vertical laying of crus secunda palm (3 ') along said bridge floor (7).
9. the building method of pipe-hanging hook system according to claim 8; It is characterized in that; Also comprise the steps: cat ladder (5) is installed to the said i iron of encorbelmenting (4); So that an end of said cat ladder (5) is fixed on the said i iron of encorbelmenting (4), the other end is positioned at the below of said side bar (8).
10. according to Claim 8 or the building method of 9 described pipe-hanging hook systems; It is characterized in that; Also comprise the steps: when laying said crus secunda palm (3 '); The second load-bearing lumps of wood is set in the below of said crus secunda palm (3 '), and makes said crus secunda palm (3 ') and said second load-bearing lumps of wood overlap joint.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210247601.3A CN102733321B (en) | 2012-07-17 | 2012-07-17 | Suspension bracket system for existing bridge reinforcing and building method of suspension bracket system |
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| CN201210247601.3A CN102733321B (en) | 2012-07-17 | 2012-07-17 | Suspension bracket system for existing bridge reinforcing and building method of suspension bracket system |
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| CN102733321B CN102733321B (en) | 2014-11-19 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103726449A (en) * | 2013-12-19 | 2014-04-16 | 柳州欧维姆机械股份有限公司 | Automatic beam placement platform device and construction method of replacing railway beams thereby |
| CN104088225A (en) * | 2014-06-30 | 2014-10-08 | 葛洲坝集团电力有限责任公司 | Large-span steel structure hanging basket for bridge and installation method thereof |
| CN106436589A (en) * | 2016-11-01 | 2017-02-22 | 宁波市交通规划设计研究院有限公司 | Reinforced structure and method for controlling deformation compatibility of mountainous area suspension type bridge |
| CN109722996A (en) * | 2019-03-05 | 2019-05-07 | 代营伟 | For reinforcing the suspension apparatus of highway bridge and the building method of the suspension apparatus |
| CN111877191A (en) * | 2020-08-19 | 2020-11-03 | 保利长大工程有限公司 | Method for reinforcing enlarged section of double-arch bridge |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20010037914A1 (en) * | 1999-07-15 | 2001-11-08 | Preusser Mark A. | Support structure for suspending a work surface below a girder |
| JP2004360302A (en) * | 2003-06-05 | 2004-12-24 | Geo Frontier Kk | Suspending device for suspending scaffold for bridge and assembling construction method using this device |
| JP2008050811A (en) * | 2006-08-23 | 2008-03-06 | Ihi Corp | Movable suspended scaffolding apparatus |
| CN201144397Y (en) * | 2008-01-03 | 2008-11-05 | 肖松南 | Suspension work platform for bridge maintenance |
| CN202064292U (en) * | 2011-05-23 | 2011-12-07 | 湖南中铁五新钢模有限责任公司 | Distribution type hanging basket front hanging device |
-
2012
- 2012-07-17 CN CN201210247601.3A patent/CN102733321B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010037914A1 (en) * | 1999-07-15 | 2001-11-08 | Preusser Mark A. | Support structure for suspending a work surface below a girder |
| JP2004360302A (en) * | 2003-06-05 | 2004-12-24 | Geo Frontier Kk | Suspending device for suspending scaffold for bridge and assembling construction method using this device |
| JP2008050811A (en) * | 2006-08-23 | 2008-03-06 | Ihi Corp | Movable suspended scaffolding apparatus |
| CN201144397Y (en) * | 2008-01-03 | 2008-11-05 | 肖松南 | Suspension work platform for bridge maintenance |
| CN202064292U (en) * | 2011-05-23 | 2011-12-07 | 湖南中铁五新钢模有限责任公司 | Distribution type hanging basket front hanging device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103726449A (en) * | 2013-12-19 | 2014-04-16 | 柳州欧维姆机械股份有限公司 | Automatic beam placement platform device and construction method of replacing railway beams thereby |
| CN104088225A (en) * | 2014-06-30 | 2014-10-08 | 葛洲坝集团电力有限责任公司 | Large-span steel structure hanging basket for bridge and installation method thereof |
| CN104088225B (en) * | 2014-06-30 | 2016-06-15 | 葛洲坝集团电力有限责任公司 | Bridge large-span steel hanging basket and installation method thereof |
| CN106436589A (en) * | 2016-11-01 | 2017-02-22 | 宁波市交通规划设计研究院有限公司 | Reinforced structure and method for controlling deformation compatibility of mountainous area suspension type bridge |
| CN109722996A (en) * | 2019-03-05 | 2019-05-07 | 代营伟 | For reinforcing the suspension apparatus of highway bridge and the building method of the suspension apparatus |
| CN111877191A (en) * | 2020-08-19 | 2020-11-03 | 保利长大工程有限公司 | Method for reinforcing enlarged section of double-arch bridge |
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| Publication number | Publication date |
|---|---|
| CN102733321B (en) | 2014-11-19 |
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Effective date of registration: 20170616 Address after: 100068 Fengtai District South Fourth Ring Road, Beijing, No. 163 Patentee after: Beijing municipal administration road and bridge limited company Address before: 100068 Fengtai District South Fourth Ring Road, Beijing, No. 163 Patentee before: Beijing Road and Bridge Construction Co., Ltd. |
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