CN206667029U - A kind of hybrid structure of arch and beam formula concrete continuous girder bridge structure - Google Patents

A kind of hybrid structure of arch and beam formula concrete continuous girder bridge structure Download PDF

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Publication number
CN206667029U
CN206667029U CN201720364368.5U CN201720364368U CN206667029U CN 206667029 U CN206667029 U CN 206667029U CN 201720364368 U CN201720364368 U CN 201720364368U CN 206667029 U CN206667029 U CN 206667029U
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girder
arch
pier
box
bridge
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彭元诚
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CCCC Second Highway Consultants Co Ltd
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CCCC Second Highway Consultants Co Ltd
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Abstract

The utility model discloses a kind of hybrid structure of arch and beam formula concrete continuous girder bridge structure,Including multiple main piers,Pier top column and pier top beam section are provided with the top of each main pier,It is connected respectively with two hybrid structure of arch and beam for being arranged on its both sides frameworks,Described hybrid structure of arch and beam framework is by lower edge arch box-girder,The box-girder that winds up forms,The described box-girder that winds up is horizontally disposed from being stretched out to along bridge to the both sides of main pier at pier top beam section both ends,Described lower edge arch box-girder is obliquely installed,Stretched out at from pier top column lower end to along bridge to the both sides of main pier,Described lower edge arch box-girder converges with the box-girder that winds up in main pier both sides,Wind up box-girder tension,Lower edge arch box-girder is pressurized,Lower edge arch box-girder and the box-girder that winds up reach stress balance,And lower edge arch box-girder axis arches up,Moment of flexure caused by partial offset deadweight,As based on compression and the more uniform arch structure of stress distribution.

Description

A kind of hybrid structure of arch and beam formula concrete continuous girder bridge structure
Technical field
It the utility model is related to one kind and be used for civil engineering bridge technology field, be more particularly to a kind of hybrid structure of arch and beam formula and mix Native continuous bridge structure is coagulated, realizes and a kind of possesses bigger span ability and the more preferably new continuous bridge girder construction of economy Form.
Background technology
Bridge is in highway, railway, urban road and road and water conservancy construction, in order to cross over various obstacle (such as rivers Stream or other structures) works.Divided by structure feature, bridge can be divided into beam, arch, rigid frame, hang and combined system. Concrete structure is mainly using beam, arch, rigid frame system.Concrete continuous girder bridge is a kind of basic bridge type of Longspan Bridge, with Unlike continuous rigid frame bridge pier consolidation, superstructure of continuous beam bridge is connected with bridge pier using fixed or movable bearing, therefore Compared with continuous rigid frame bridge, pier shaft height is smaller, although reducing span ability, bearing capacity is greatly improved, and is China or even the world are in a kind of most widely used long span concrete bridge structure of field of traffic.
The Technological Economy of traditional construction with brackets prestressed concrete continuous beam is applicable across footpath about in 20~60m, hangs The Technological Economy of arm method construction large span prestressed concrete continuous bridge is applicable across footpath about in 80~150m, exceedes in across footpath During 150m, easily there is the defects of middle span deflexion, beam body deformation, cracking, had a strong impact on the service life and durability of bridge, limited The span ability of this bridge type is made.At present, there is said structure in the large-span concrete continuous bridge that China has nearly hundred Property defect and endurance issues.On the whole, the main deficiency of traditional prestressed concrete continuous beam is:(1) structure is held It is low to carry efficiency, when across footpath is more than 150m, easy cracking, downwarp problem, technical risk increase, the security and durability of structure Deterioration, the impatient acute deterioration of engineering economy;(2) superstructure causes bridge pier, foundation engineering scale big from great.
So under this background, exploitation is a kind of completely to possess bigger span ability and more preferably economy, newly continuous Girder construction form, has great practical value.
Utility model content
The purpose of this utility model is to be to provide a kind of hybrid structure of arch and beam formula concrete continuous girder bridge structure type, from structure The load-carrying efficiency of bridge structure is improved in terms of system and inherent force-mechanism, is connected well with traditional construction method, is easy to reality Apply.
To achieve these goals, the utility model provides a kind of hybrid structure of arch and beam formula concrete continuous girder bridge structure, bag Multiple main piers are included, pier top column and pier top beam section, the pier top beam section and pier top column are provided with the top of each main pier It is connected with a hybrid structure of arch and beam framework, described hybrid structure of arch and beam framework is made up of lower edge arch box-girder, the box-girder that winds up, described The box-girder that winds up it is horizontally disposed from being stretched out to along bridge to the both sides of main pier at pier top beam section both ends, described lower edge arch case Ellbeam is obliquely installed, from pier top column lower end to along both sides from bridge to main pier stretch out, described lower edge arch box-girder with The box-girder that winds up converges in main pier both sides, box-girder tension of winding up, lower edge arch box-girder be pressurized, lower edge arch box-girder and The box-girder that winds up reaches stress balance, and lower edge arch box-girder axis arches up, and partial offset moment of flexure caused by deadweight, turns into Based on compression and the more uniform arch structure of stress distribution.
Further, it is connected between adjacent hybrid structure of arch and beam framework by Middle span closing beam section, hybrid structure of arch and beam framework and bridge It is connected between platform by end bay closure beam section with abutment pier beam section, forms a whole bridge section.
Further, described pier top beam section is arranged on pier top column upper end, is rigidly connected with pier top column;Described pier Top column is vertically arranged at the top of main pier, is hinged with main pier by bearing.
Further, basis is installed in the bottom of main pier and multiplies platform, described basis instrument is in the following engineering of earth's surface In the suitable ground layer of geology, cushion cap is connected integral on basis with basis top;Described main pier, which is arranged on, to be held On platform, it is rigidly connected with cushion cap, pier height is less than 25m, using the Thin-wall Hollow Pier that rigidity is larger.
Further, described lower edge arch box-girder, from pier top column lower end to along bridge to both sides stretch out, root Just tied with corresponding pier top column, the centroidal axis of lower edge box-girder is bent using the arch parabola or circular arc function tilted upward Line.
Further, the described box-girder that winds up, from pier top beam section both ends to along bridge to both sides stretch out, root and phase The pier top beam section answered just is tied, and the upper limb for the box-girder that winds up is basically identical, more straight with road route longitudinal slope, bears vehicle, people The effect of group.
Further, described lower edge arch box-girder converges with the box-girder that winds up in main pier both sides;Hybrid structure of arch and beam frame The lower edge arch box-girder of frame and the box-girder that winds up are symmetrical with bridge pier center in length and beam body section, mutually put down in weight Weighing apparatus.
Further, described solid web girder section is And of Varying Depth box beam, by hybrid structure of arch and beam frame ends, symmetrically towards Shun Qiao Stretched out to cantilever until span centre.Lower edge uses the parabolic function or circular arc letter unified with hybrid structure of arch and beam framework lower edge arch box beam Number smooth-going change, so that structure stress smoothes out;Upper limb is basically identical, more straight with road route longitudinal slope, bears vehicle, crowd Effect;Solid web girder section, hybrid structure of arch and beam framework and pier top column, pier top beam section are formed relative to main pier symmetrical balance together Single group hybrid structure of arch and beam formula cantilever superstructure.
Further, described abutment pier beam section is located at the top of abutment pier, is connected with abutment pier by bearing, with corresponding arched girder group Box-like cantilever superstructure forms end bay superstructure by end bay closure beam section, connection;Multigroup hybrid structure of arch and beam formula cantilever top Structure connects to form main span top knot by Middle span closing beam section;Main span superstructure, end bay superstructure and corresponding bridge pier, Cushion cap, basis, form and connect with the hybrid structure of arch and beam formula concrete that superstructure is continuous, bridge pier and spanning superstructure bearing are be hinged Continuous beam bridge structure.
The utility model determines suitable hybrid structure of arch and beam knot according to structure stress size, code for structural design prevailing for the time being in force Each scantling of structure framework, steel flanged beam cantilever beam section sectional dimension and prestressing force size;Hybrid structure of arch and beam formula cantilever design group number N> =2, form the continuous girder and arch combination bridge structure of N-1 main span;Hybrid structure of arch and beam formula cantilever design group number N=1, then formed and do not had There is main span, there was only the continuous girder and arch combination bridge structure of end bay.
The utility model a kind of system and mechanical characteristics of the structure of hybrid structure of arch and beam formula concrete continuous girder bridge, including:
(1) pier top column cantilever stretch out arched girder frame structure, for box-girder tension of winding up, lower edge arch box-girder by Pressure, homeostatic arch structure;Lower edge compression beam section axis suitably arches up, moment of flexure caused by partial offset deadweight, turn into Based on compression and the more uniform arch structure of stress distribution, the performance of concrete material can be more fully played;
(2) arched girder frame structure, the axial compressive force of inclined lower edge arch box-girder, can be come with the transmission of balanced cantilever structure Shearing, there is powerful shear resistance;The arm of force effect for box-girder pulling force and the lower edge arch box-girder pressure of winding up, Ke Yiping The moment of flexure that the cantilever design that weighs transmission comes, has powerful bending resistance;
(3) the big region of structure stress uses arched girder frame structure, and shearing resistance, bending resistance are greatly enhanced, and structure is held Efficiency is carried to be improved.
The utility model has advantages below relative to prior art:
(1) on the premise of the traditional material (C50~C65 concrete) of holding, traditional cantilever construction technology, the company of raising Continuous 1.5~2 times of beam bridge span ability, makes the across footpath of continuous bridge reach 200~300 meters;
(2) arch, the mechanical characteristics advantage of girder construction are taken full advantage of, the load-carrying efficiency of girder structure is improved, in across footpath In the range of 150~200m, relatively conventional steel flanged beam box-beam structure, arched girder frame structure saves material, has more preferable engineering Economy;
(3) structure bending resistance shear resistance is improved, reduces structure crack risk, there is more preferable durability.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are these Some embodiments of utility model, for those of ordinary skill in the art, on the premise of not paying creative work, also Other accompanying drawings can be obtained according to these accompanying drawings.
Fig. 1 is hybrid structure of arch and beam formula concrete continuous girder bridge structure multispan schematic diagram;
Fig. 2 is the hybrid structure of arch and beam formula concrete continuous girder bridge structural representation of only end bay;
Fig. 3 is single group hybrid structure of arch and beam formula cantilever design schematic diagram;
Fig. 4 is that hybrid structure of arch and beam framework winds up and lower edge box beam sectional schematic diagram;
In figure:1- main spans, 2- end bays, 3- bases, 4- cushion caps, 5- main piers, 6- abutment piers, 7- abutments, 8- bearings, 9- pier tops Column, 10- pier top beam sections, 11- hybrid structure of arch and beam frameworks, 12- solid web girder sections, 13- abutment pier beam sections, 14- Middle span closing beam sections, 15- End bay closure beam section, 16- lower edge arch box-girders, 17- wind up box-girder
Embodiment
It is noted that described further below is all exemplary, it is intended to provides further instruction to the application.It is unless another Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
As background technology is introduced, it is low (1) structural bearing efficiency to be in the prior art present, when across footpath is more than 150m, Easy cracking, downwarp problem, technical risk increase, security and the durability deterioration of structure, the impatient acute deterioration of engineering economy; (2) superstructure is from great, causes bridge pier, the problems such as foundation engineering scale is big, in order to solve technical problem as above, the application Propose a kind of hybrid structure of arch and beam formula concrete continuous girder bridge structure.
Below in conjunction with accompanying drawing, structure of the present utility model is further described.
The utility model provides one kind relative to traditional continuous bridge, and structure stress mechanism and load-carrying efficiency are higher, have Standby bigger span ability, economic performance are superior, field operation amount and a kind of less hybrid structure of arch and beam formula concrete of difficulty of construction Continuous bridge structure, including multiple main piers, pier top column and pier top beam section, the pier top are provided with the top of each main pier Beam section and pier top column are connected with a hybrid structure of arch and beam framework, described hybrid structure of arch and beam framework by lower edge arch box-girder, wind up Box-girder forms, and the described box-girder that winds up is horizontally disposed from being stretched out to along bridge to the both sides of main pier at pier top beam section both ends, Described lower edge arch box-girder is obliquely installed, from pier top column lower end to along both sides from bridge to main pier stretch out, it is described Lower edge arch box-girder converges with the box-girder that winds up in main pier both sides, and box-girder tension of winding up, lower edge arch box-girder are pressurized, Lower edge arch box-girder and the box-girder that winds up reach stress balance, and lower edge arch box-girder axis arches up, partial offset from Moment of flexure caused by weight, turns into based on compression and the more uniform arch structure of stress distribution.
The arched girder frame structure that pier top column cantilever stretches out, it is pressurized, certainly for box-girder tension of winding up, lower edge arch box-girder The arch structure that I balances;Lower edge arch box-girder compression beam section axis suitably arches up, moment of flexure caused by partial offset deadweight, into Based on compression and the more uniform arch structure of stress distribution, can more fully to play the performance of concrete material;
Arched girder frame structure, the axial compressive force of inclined lower edge arch box-girder, it can be come with the transmission of balanced cantilever structure Shearing, has powerful shear resistance;The arm of force for the pulling force of box-girder and the pressure of lower edge arch box-girder of winding up acts on, can be with The moment of flexure that the transmission of balanced cantilever structure comes, has powerful bending resistance;
The big region of overall structure stress uses arched girder frame structure, and shearing resistance, bending resistance are greatly enhanced, and structure is held Efficiency is carried to be improved.
Further, it is connected between adjacent hybrid structure of arch and beam framework by Middle span closing beam section, hybrid structure of arch and beam framework and bridge It is connected between platform by end bay closure beam section with abutment pier beam section, forms a whole bridge section.
Further, described pier top beam section is arranged on pier top column upper end, is rigidly connected with pier top column;Described pier Top column is vertically arranged at the top of main pier, is hinged with main pier by bearing.
Specifically as shown in Figure 1 to 4, a kind of hybrid structure of arch and beam formula concrete continuous girder bridge structure is by basis 3, cushion cap 4, master Bridge pier 5, bearing 8, pier top column 9, pier top beam section 10, hybrid structure of arch and beam framework 11, solid web girder section 12, abutment pier beam section 13, span centre close Imperial beam section 14, end bay closure beam section 15 form.Described hybrid structure of arch and beam framework 11 is by lower edge arch box-girder 16, wind up box-girder 17 compositions.
With reference to shown in Fig. 1, Fig. 2, basis 3 is arranged in the suitable ground layer of the following engineering geology of earth's surface, and cushion cap 4 is located at base On plinth 3 with basis 3 top be connected it is integral.
With reference to shown in Fig. 3, main pier 5 is arranged on cushion cap 4, is rigidly connected with cushion cap 4, and pier height is less than 25m, using firm Spend larger Thin-wall Hollow Pier.The lower end of pier top column 9 is supported on bearing 8, and upper end is rigidly connected with pier top beam section 10.
With reference to shown in Fig. 3, Fig. 4, lower edge arch box-girder 16, from the lower end of pier top column 9 to along bridge to both sides stretch out, root Portion has just been tied with corresponding pier top column 9, the centroidal axis of lower edge arch box-girder 16 using the arch parabola tilted upward or Circular arc function curve.Box-girder 17 wind up from being stretched out to along bridge to both sides at the both ends of pier top beam section 10, root and corresponding pier top Beam section 10 is just tied, the upper limb for the box-girder 17 that winds up is basically identical, more straight with road route longitudinal slope, bears vehicle, crowd Effect.
With reference to shown in Fig. 3, Fig. 4, lower edge arch box-girder 16 converges with the box-girder 17 that winds up, in each shape in the both sides of main pier 5 Into a hybrid structure of arch and beam framework 11;Winding up for hybrid structure of arch and beam framework 11 is symmetrical with bridge pier with lower edge in length and beam body section The heart, mutually balanced in weight.
With reference to shown in Fig. 3, Fig. 4, solid web girder section 12 is And of Varying Depth box beam, by the end of hybrid structure of arch and beam framework 11, symmetrically Xiang Shunqiao is stretched out to cantilever until span centre.Lower edge uses the parabola letter unified with the lower edge arch box beam 16 of hybrid structure of arch and beam framework 11 Number or the smooth-going change of circular arc function, so that structure stress smoothes out;Upper limb is basically identical, more straight with road route longitudinal slope, holds Acted on by vehicle, crowd;Solid web girder section 12, hybrid structure of arch and beam framework 11 and pier top column 9, pier top beam section 10 are formed relatively together In the single group hybrid structure of arch and beam formula cantilever superstructure of bridge pier symmetrical balance.
With reference to shown in Fig. 3, Fig. 4, abutment pier beam section 13 is located at the top of abutment pier 6, is connected with abutment pier 6 by bearing 8, encircles with one side Beam combination cantilever structure, the superstructure of end bay 2 is formed by the connection of end bay closure beam section 15;Multigroup hybrid structure of arch and beam formula cantilever knot Structure forms the top of main span 1 by the connection of Middle span closing beam section 14 and tied;The superstructure of main span 1, the superstructure of end bay 2 and corresponding bridge Pier, cushion cap, basis, form with the hybrid structure of arch and beam formula coagulation that superstructure is continuous, bridge pier and spanning superstructure bearing are be hinged Native continuous bridge structure.
With reference to shown in Fig. 1, Fig. 2, suitable arched girder is determined according to structure stress size, code for structural design prevailing for the time being in force Each scantling of combining structure framework, steel flanged beam cantilever beam section sectional dimension and prestressing force size;Hybrid structure of arch and beam formula cantilever design Group number N>=2, form the continuous girder and arch combination bridge structure of N-1 main span 1;Hybrid structure of arch and beam formula cantilever design group number N=1, Then form no main span 1, there was only the continuous girder and arch combination bridge structure of end bay 2.
As can be seen from the above description, the application the above embodiments realize following technique effect:
(1) on the premise of the traditional material (C50~C65 concrete) of holding, traditional cantilever construction technology, the company of raising Continuous 1.5~2 times of beam bridge span ability, makes the across footpath of continuous bridge reach 200~300 meters;
(2) arch, the mechanical characteristics advantage of girder construction are taken full advantage of, the load-carrying efficiency of girder structure is improved, in across footpath In the range of 150~2000m, relatively conventional steel flanged beam box-beam structure, arched girder frame structure saves material, has more preferable engineering Economy;
(3) structure bending resistance shear resistance is improved, reduces structure crack risk, there is more preferable durability.
It is not new to this practicality although above-mentioned specific embodiment of the present utility model is described with reference to accompanying drawing The limitation of type protection domain, one of ordinary skill in the art should be understood that on the basis of the technical solution of the utility model, ability Field technique personnel need not pay the various modifications that creative work can make or deformation still in protection model of the present utility model Within enclosing.

Claims (9)

1. a kind of hybrid structure of arch and beam formula concrete continuous girder bridge structure, it is characterised in that including multiple main piers, in each main pier Top be provided with pier top column and pier top beam section, the pier top beam section and pier top column are connected with a hybrid structure of arch and beam framework, institute The hybrid structure of arch and beam framework stated is made up of lower edge arch box-girder, the box-girder that winds up, and the described box-girder that winds up is horizontally disposed by pier Stretched out at back timber section both ends to along bridge to the both sides of main pier, described lower edge arch box-girder is obliquely installed, by pier top column Stretched out at lower end to along bridge to the both sides of main pier, described lower edge arch box-girder and the box-girder that winds up converge in main pier both sides Closing, box-girder tension of winding up, lower edge arch box-girder are pressurized, lower edge arch box-girder and the box-girder that winds up reach stress balance, And lower edge arch box-girder axis arches up, moment of flexure caused by partial offset deadweight, turn into based on compression and stress distribution compared with Uniform arch structure.
2. hybrid structure of arch and beam formula concrete continuous girder bridge structure as claimed in claim 1, it is characterised in that described pier top beam section Pier top column upper end is arranged on, is rigidly connected with pier top column;Described pier top column is vertically arranged at the top of main pier, with main bridge Pier is hinged by bearing.
3. hybrid structure of arch and beam formula concrete continuous girder bridge structure as claimed in claim 1, it is characterised in that in host bridge pier Bottom is provided with basis and multiplies platform, and in the suitable ground layer of the following engineering geology of earth's surface, cushion cap is located at described basis instrument On basis with basis at the top of be connected it is integral;Described main pier is arranged on cushion cap, is rigidly connected with cushion cap.
4. hybrid structure of arch and beam formula concrete continuous girder bridge structure as claimed in claim 1, it is characterised in that described lower edge arch Box-girder, from pier top column lower end to along bridge to both sides stretch out, root just tied with corresponding pier top column, lower edge box-girder Centroidal axis using the arch parabola or circular arc function curve that tilt upward.
5. hybrid structure of arch and beam formula concrete continuous girder bridge structure as claimed in claim 1, it is characterised in that described box-shaped of winding up Beam, from pier top beam section both ends to along bridge to both sides stretch out, root just tied with corresponding pier top column, the box-girder that winds up it is upper Edge is basically identical, more straight with road route longitudinal slope, bears the effect of vehicle, crowd.
6. hybrid structure of arch and beam formula concrete continuous girder bridge structure as claimed in claim 1, it is characterised in that described lower edge arch Box-girder converges with the box-girder that winds up in pier top framework both sides;The lower edge arch box-girder of hybrid structure of arch and beam framework and the box-girder that winds up Bridge pier center is symmetrical with length and beam body section, is mutually balanced in weight.
7. hybrid structure of arch and beam formula concrete continuous girder bridge structure as claimed in claim 1, it is characterised in that adjacent hybrid structure of arch and beam It is connected between framework by solid web girder section, passes through end bay closure beam section and abutment pier beam section phase between hybrid structure of arch and beam framework and abutment Even, a whole bridge section is formed.
8. hybrid structure of arch and beam formula concrete continuous girder bridge structure as claimed in claim 7, it is characterised in that described solid web girder section For And of Varying Depth box beam, stretched out from hybrid structure of arch and beam frame ends to along bridge to cantilever until span centre, its lower edge use and arched girder group The unified parabolic function of framework lower edge arch box beam or the smooth-going change of circular arc function are closed, so that structure stress smoothes out;Upper limb with Road route longitudinal slope is basically identical;Solid web girder section, hybrid structure of arch and beam framework and pier top beam section, pier top column are formed relative to bridge together The single group hybrid structure of arch and beam formula cantilever superstructure of pier symmetrical balance.
9. hybrid structure of arch and beam formula concrete continuous girder bridge structure as claimed in claim 8, it is characterised in that described abutment pier beam section At the top of abutment pier, it is connected by bearing with abutment pier, with corresponding hybrid structure of arch and beam formula cantilever design by end bay closure beam section, is connected Connect to form end bay superstructure;Multigroup hybrid structure of arch and beam formula cantilever design connects to form main span top knot by Middle span closing beam section; Main span superstructure, end bay superstructure and corresponding bridge pier, cushion cap, basis, forming has continuous superstructure, bridge pier and bridge Step up the be hinged hybrid structure of arch and beam formula concrete continuous girder bridge structure of portion's structural bearings.
CN201720364368.5U 2017-04-07 2017-04-07 A kind of hybrid structure of arch and beam formula concrete continuous girder bridge structure Active CN206667029U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106988202A (en) * 2017-04-07 2017-07-28 中交第二公路勘察设计研究院有限公司 A kind of hybrid structure of arch and beam formula concrete continuous girder bridge structure
CN109487705A (en) * 2018-10-11 2019-03-19 中国铁道科学研究院集团有限公司电子计算技术研究所 The continuous beam section elevation method for early warning of railway cantilever construction and device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106988202A (en) * 2017-04-07 2017-07-28 中交第二公路勘察设计研究院有限公司 A kind of hybrid structure of arch and beam formula concrete continuous girder bridge structure
CN109487705A (en) * 2018-10-11 2019-03-19 中国铁道科学研究院集团有限公司电子计算技术研究所 The continuous beam section elevation method for early warning of railway cantilever construction and device
CN109487705B (en) * 2018-10-11 2020-08-25 中国铁道科学研究院集团有限公司电子计算技术研究所 Railway cantilever construction continuous beam section elevation early warning method and device

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