CN103758023B - Prestressed concrete and steel truss mixed continuous rigid frame bridge and construction method thereof - Google Patents

Prestressed concrete and steel truss mixed continuous rigid frame bridge and construction method thereof Download PDF

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Publication number
CN103758023B
CN103758023B CN201410031894.0A CN201410031894A CN103758023B CN 103758023 B CN103758023 B CN 103758023B CN 201410031894 A CN201410031894 A CN 201410031894A CN 103758023 B CN103758023 B CN 103758023B
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China
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steel truss
concrete
steel
rigid frame
bridge
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CN201410031894.0A
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Chinese (zh)
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CN103758023A (en
Inventor
袁明
詹重娇
曾勇
颜东煌
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长沙理工大学
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Abstract

The invention discloses a prestressed concrete and steel truss mixed continuous rigid frame bridge and a construction method thereof. The rigid frame bridge comprises a main span, a side span and a pier, wherein the middle part of the main span is a steel truss girder, and the remaining parts of the main span and the side span are concrete box girders. The connecting structure of the steel truss girder and the concrete box girders is a steel and concrete joint section. The steel truss girder comprises steel truss rod pieces and concrete bridge deck slabs, each steel truss rod piece comprises an upper chord, a lower chord, a web member, top bracing and lower bracing, the upper chords of steel trusses are connected to the concrete bridge deck slabs through shearing force connecting pieces, and each concrete box girder comprises a top plate, a bottom plate, a web plate and a diaphragm plate. The prestressed concrete and steel truss mixed continuous rigid frame bridge is good in mechanical property, large in span capacity, good in economic performance and suitable for being applied to construction in mountainous areas and other places with inconvenient transportation.

Description

Prestressed concrete-steel truss mixing continuous rigid frame bridge and its construction method
Technical field
The present invention relates to technical field of bridge engineering, it is more particularly to a kind of prestressed concrete-steel truss mixing continuous Rigid frame bridge and its construction method.
Background technology
With the continuous development of modern transportation cause, the span of bridge, quality and economic performance are had increasingly High requirement, is preferably balanced using being often difficult to seek one during homogenous material between the mechanical property and economy of structure Point.
The bridge of traditional single use concrete box girder construction is difficult to greatly the requirement of large span due to bridge deadweight, Build link many, take a substantial amount of time, and concrete performance is unstable, lead to the deformation of bridge later stage and prestressing force to damage Lose.Existing steel reinforced concrete mixing bridge is mainly main span and adopts steel box-girder, and end bay adopts the method for construction of concrete box girder, this side Method effectively increases the span of bridge, improves the stress performance of structure, but economic performance is not very high, and constructs and be subject to traffic Condition and site influence are larger.
Content of the invention
(1) technical problem to be solved
The technical problem to be solved in the present invention be how to increase on the premise of economic performance is good bridge span and to Construction brings convenience.
(2) technical scheme
In order to solve above-mentioned technical problem, the invention provides a kind of prestressed concrete-steel truss mixing continuous rigid frame Bridge, this rigid frame bridge includes: the span centre part of main span, end bay and bridge pier, wherein main span is steel truss girder, main span remainder and side Across for concrete box girder, steel truss girder is steel-concrete joint segment with the attachment structure of concrete box girder;
Described steel truss girder includes steel truss rod member and concrete slab, and wherein steel truss rod member includes top boom, lower edge Bar, web member, top bracing, bottom lateral bracing, top boom is passed through top bracing and is connected with adjacent top boom, and lower boom passes through bottom lateral bracing and phase Adjacent lower boom connects, and lays web member between top boom and lower boom;Described concrete box girder include top board, base plate, web and Diaphragm plate.
Preferably, the steel truss of this rigid frame bridge, its top boom is connected with concrete slab by shear connector.
Preferably, the steel truss of this rigid frame bridge has two kinds of section forms:
(1) web member of steel truss is i shaped cross section, and other rod members of steel truss are box-type section;
(2) bottom lateral bracing of steel truss is i shaped cross section, and other rod members of steel truss are box-type section.
Preferably, external prestressing steel bundle is set at the steel truss negative moment of girder of this rigid frame bridge.
Preferably, the steel truss of this rigid frame bridge is dismantled and assembled steel truss.
Preferably, the top board included by the concrete box girder of this rigid frame bridge, base plate and web by top of bridge pier fulcrum to It is gradually reduced at maximum concrete cantilever.
Preferably, the concrete box girder of this rigid frame bridge arranges longitudinal prestressing steel bundle, lateral prestressing tendon, vertically in advance should Power steel bundle.
Preferably, the bridge pier of this rigid frame bridge is armored concrete double thin wall pier.
The invention also discloses a kind of construction method of prestressed concrete-steel truss mixing continuous rigid frame bridge, including with Lower step:
(1) pile foundation and the construction of bridge pier are carried out;
(2) No. 0 block is poured on bridge pier, prestressed strand tensioning is carried out to No. 0 block;
(3) carry out cast-in-place and prestressed strand tensioning, the symmetrical casting concrete box beam in No. 0 block both sides respectively saves on bridge pier Section;
(4) the end bay concrete box girder segment that method pours rigid frame bridge, end bay closure are set up using support, and it is pre- to carry out end bay Stress steel Shu Zhangla;
(5) steel-concrete joint segment relies on Hanging Basket lifting to put in place;
(6) crane barge is adopted to set up method or the steel truss of erection crane erection by protrusion erection main span span centre;
(7) lift the precast concrete floorings of steel truss top of the trellis, pour wet seam;
(8) tensioning rigid frame bridge external prestressing steel bundle;
(9) appurtenant work and the deck paving of described rigid frame bridge are completed.
(3) beneficial effect
The prestressed concrete of the present invention-steel truss mixing continuous rigid frame bridge adopts steel truss girder and concrete box due to main span Structure acquirement some beneficial effect following that beam combines:
(1) compare the bridge of more single steel box-girder, be conducive to reducing sectional dimension of members and save steel, economic performance Improve;
(2) with respect to the bridge of concrete box girder, effectively alleviate bridge deadweight it is achieved that bridge span further Increase, realize more than 300 meters of main span;
(3) steel truss is capable of prefabrication and on-site consolidation, less by transportation condition and site influence, in mountain area and Other ungetable places also can normal construction, and construction method is quick, improves efficiency of construction.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the facade arrangement schematic diagram of prestressed concrete-steel truss mixing continuous rigid frame bridge.
Fig. 2 is the facade of the part steel truss girder that prestressed concrete-steel truss mixing continuous rigid frame bridge adopts section form i Arrangement schematic diagram.
Fig. 3 is the vertical of the part steel truss girder that prestressed concrete-steel truss mixing continuous rigid frame bridge adopts section form ii Schematic diagram is arranged in face.
Fig. 4 is that prestressed concrete-steel truss mixing continuous rigid frame bridge adopts sectional view at the b-b of section form i.
Fig. 5 is that prestressed concrete-steel truss mixing continuous rigid frame bridge adopts sectional view at the b-b of section form ii.
Fig. 6 is sectional view at prestressed concrete-steel truss mixing continuous rigid frame bridge a-a.
Fig. 7 is sectional view at prestressed concrete-steel truss mixing continuous rigid frame bridge c-c.
Fig. 8 is the steel truss rod member box-type section figure of prestressed concrete-steel truss mixing continuous rigid frame bridge.
Fig. 9 is the steel truss rod member i shaped cross section figure of prestressed concrete-steel truss mixing continuous rigid frame bridge.
Marginal data:
1st, bridge pier;2nd, prestressing with bond steel bundle;3rd, external prestressing steel bundle;4th, steel-concrete joint segment;5th, steel truss girder; 6th, concrete box girder;7th, top boom;8th, lower boom;9th, web member;10th, top bracing;11st, bottom lateral bracing;12 concrete slabs;13、 Top board;14、
Base plate;15th, web;16th, diaphragm plate.
Specific embodiment
With reference to the accompanying drawings and examples the present invention is described in further detail.Following examples are used for this is described Bright, but can not be used for limiting the scope of the present invention.
Fig. 1 is the facade cloth of the prestressed concrete-steel truss mixing continuous rigid frame bridge of a preferred embodiment of the present invention Put schematic diagram.This rigid frame bridge includes bridge pier 1 and the concrete box girder 6 being supported by bridge pier and steel truss girder 5.Main span span centre part is adopted With steel truss and concrete bridge deck board combining structure, should across remainder and other across using three dimension prestressing concrete box Beam., up to more than 300m, its main span steel truss beam length is up to 100m for this rigid frame bridge main span.
This rigid frame bridge bridge pier 1 adopts armored concrete double thin wall pier, and Fig. 6 is profile at bridge pier 1a-a;Girder adopts body Interior prestressed strand 2 and external prestressing steel bundle 3 combine.Steel truss girder 5 mainly include top boom 7, lower boom 8, web member 9, on Lateral 10, bottom lateral bracing 11 and concrete slab 12, wherein concrete slab 12 connect top boom 7 by shear connector. Concrete box girder 6 mainly includes top board 13, base plate 14, web 15 and diaphragm plate 16.
In the present embodiment, the top board 13 thickness a of concrete box girder 6 is 0.3m~2m, and wherein, maximum concrete cantilever end cuts Top board 13 thickness a at face is 0.3m, and at top of bridge pier fulcrum section, top board 13 thickness a is 2m;The base plate 14 of concrete box girder 6 is thick Degree b is 0.5m~2.5m, and wherein, the base plate 14 thickness b at maximum concrete cantilever end section is 0.5m, top of bridge pier fulcrum section The base plate thickness b at place is 2.5m, the thickness of the base plate at maximum concrete cantilever end section and between top of bridge pier fulcrum section Change in 1.5 parabola rules;The web 15 thickness c of concrete box girder 6 is 0.5m~1.5m, wherein, maximum concrete suspension Web 15 thickness c at arm end section is 0.5m, and the web thickness c at pier top fulcrum section is 1.5m, maximum concrete cantilever The thickness of the web at end section and between top of bridge pier fulcrum section is in gradual change type;Diaphragm plate 16 thickness of concrete box girder 6 For 0.15m, arrange with end bay end at pier top fulcrum.Concrete box girder adopts longitudinal prestressing, transverse prestress and vertical Prestressing force.
In the present embodiment, the rod member of steel truss girder can adopt two kinds of different section forms of i, ii.
, all using box-type section, edge of a wing height h is 0.9m, web width b for i, the top boom 7a of steel truss girder 5 and lower boom 8a For 0.9m, web thickness tfFor 0.044m, edge of a wing plate thickness twFor 0.044m;The web member 9a of steel truss girder 5 adopts I-shaped cross-section, Edge of a wing height h is 0.63m, and web width b is 0.18m, web thickness tfFor 0.017m, edge of a wing plate thickness twFor 0.022m;Steel truss All using box-type section, edge of a wing height h is 0.9m to the top bracing 10a of beam 5 and bottom lateral bracing 11a, and web width b is 0.9m, web Thickness tfFor 0.037m, edge of a wing plate thickness twFor 0.037m;The thickness d of the concrete slab 12a of steel truss girder 5 is 0.2m.
Ii, the top boom 7b of steel truss girder 5 adopt box-type section, and edge of a wing height h is 0.9m, and web width b is 0.9m, web Thickness tfFor 0.028m, edge of a wing plate thickness twFor 0.036m;The lower boom 8b of steel truss girder 5 adopts box-type section, and edge of a wing height h is 0.9m, web width b is 0.9m, web thickness tfFor 0.028m, edge of a wing plate thickness twFor 0.028m;The web member 9b of steel truss 5 adopts With box-type section, edge of a wing height h is 0.6m, and web width b is 0.8m, web thickness tfFor 0.02m, edge of a wing plate thickness twFor 0.028m;The top bracing 10b of steel truss girder 5 adopts box-type section, and edge of a wing height h is 0.4m, and web width b is 0.35m, and web is thick Degree tfFor 0.018m, edge of a wing plate thickness twFor 0.022m;The bottom lateral bracing 11b of steel truss girder 5 adopts I-shaped cross-section, and edge of a wing height h is 0.4m, web width b is 0.4m, web thickness tfFor 0.013m, edge of a wing plate thickness twFor 0.021m;The concrete bridge of steel truss girder 5 The thickness d of panel 12b is 0.2m.The facade arrangement schematic diagram of section form i, ii of steel truss girder is respectively as shown in Figures 2 and 3.
This rigid frame bridge is prestressed concrete-steel truss mixing continuous rigid frame bridge, and concrete slab is passed through with steel truss Shear connector connects common stress, can give full play to the anti-pressure ability of concrete.Concrete slab play simultaneously floorings, Steel truss puts down multiple effects such as vertical connection, being cut of subparticipation steel truss, improves the stressing conditions of steel truss;This coagulation bridge floor Plate is subjected to, transmits bridge floor load, and forms stable space structure with steel truss, makes bridge lateral bending rigidity, resists Turn round rigidity bigger, more suitable for the bigger overbridge of span and curved bridge.
This rigid frame bridge makes steel truss girder couple together with both sides concrete box girder by steel-concrete joint segment, described steel-mixed Solidifying soil adapter section plays the important function of the various internal force between transmission steel truss girder and beams of concrete, and described various internal force include axle Power, moment of flexure, shearing, moment of torsion.Concrete slab is connected by shear connector with the top boom of steel truss, jointly participates in structure Stress.
The construction method of the prestressed concrete of the present embodiment-steel truss mixing continuous rigid frame bridge comprises the following steps:
(1) carry out the construction of pile foundation and bridge pier 1, bridge pier 1 adopts armored concrete double thin wall pier;
(2) in Thin-Wall Piers 1, formwork erection pours No. 0 block, carries out prestressed strand tensioning to No. 0 block;
(3) according to sections cantilever is cast-in-place, the order of prestressed strand 2 tensioning, the symmetrical cantilever in No. 0 block both sides in Thin-Wall Piers Each sections of casting concrete box beam 6;
(4) the end bay concrete box girder segment that method pours rigid frame bridge, end bay closure are set up using support, and it is pre- to carry out end bay Stress steel Shu Zhangla;
(5) steel-concrete joint segment 4 between rigid frame bridge concrete box girder and steel truss girder is relied on Hanging Basket lifting to put in place;
(6) crane barge is adopted to set up method or erection crane erection by protrusion erection span centre steel truss girder 5 according to differently potential condition Steel truss part;
(7) lift the precast concrete floorings 12 at steel truss girder 5 top, and pour wet seam;
(8) rigid frame bridge external prestressing steel bundle 3 is closed in tensioning;
(9) complete appurtenant work and the deck paving of rigid frame bridge, complete to construct.
Steel truss construction can set up method using crane barge or erection crane erection by protrusion sets up.For korneforos bridge opening, when When natural environment satisfaction requires, steel truss can be carried out integral assembling on bank, be allocated and transported with crane barge and whole section of steel truss is installed.And Some depth of waters, stream are anxious, bridge is high, open the navigation or air flight under train-passing through conditions under great He Qiao, and the construction of steel truss preferably adopts erection crane cantilever to spell Dress method sets up.
This rigid frame bridge effectively alleviate bridge deadweight, solve Large Span Prestressed continuous rigid frame bridge because dead-load stress too high And be difficult to improve span ability a difficult problem, be effectively improved because concrete shrinkage and creep large-span structure later stage line style is changed bad Impact;This structure had both increased rigidity and the weight of main span, reduced main span internal force and deformation, and end bay can be reduced or avoided again Negative reaction in end fulcrum;This rigid frame bridge economic performance is good, and main span span centre adopts steel truss and concrete bridge deck board combining structure, Compare common Prestressed Concrete Bridges and in all greatly reduce construction costs across the steel reinforced concrete mixing bridge using steel box-girder, save Save expense;Significantly increase bridge span with respect to the bridge of single use concrete box girder.
Steel truss can using trussmember factory be processed with pre-splicing, break after arrived using component mode packed and transported Bridge location, again component assembly is become purlin piece or purlin section at end of the bridge two ends and purlin section or the peace of purlin piece carried out by certain form of construction work Dress scheme of architecture, thus the construction of this bridge type affected by transportation condition and construction site less, in mountain area and other traffic not Just place also can normal construction, and construction method is quick, rapid, advantageously ensures that the duration, improves efficiency of construction.
Embodiment of above is merely to illustrate the present invention, rather than limitation of the present invention.Although with reference to embodiment to this Bright be described in detail, it will be understood by those within the art that, technical scheme is carried out various combinations, Modification or equivalent, without departure from the spirit and scope of technical solution of the present invention, the right that all should cover in the present invention will Ask in the middle of scope.

Claims (7)

1. a kind of prestressed concrete-steel truss mixing continuous rigid frame bridge is it is characterised in that described rigid frame bridge includes: main span, side Across and bridge pier, the wherein span centre part of main span is steel truss girder, and main span remainder and end bay are concrete box girder, steel truss girder with The attachment structure of concrete box girder is steel-concrete joint segment;
Described steel truss girder includes steel truss rod member and concrete slab, and wherein steel truss rod member includes top boom, lower boom, abdomen Bar, top bracing, bottom lateral bracing, top boom passes through top bracing and adjacent top boom and connects, lower boom by bottom lateral bracing with adjacent Lower boom connects, and lays web member between top boom and lower boom;Described concrete box girder includes top board, base plate, web and tabula Plate;
In a vertical plane, for each top boom at non-two ends, each top boom at described non-two ends passes through two abdomens Bar connects two nearest with it lower boom respectively;
Described steel truss rod member has two kinds of section forms:
(1) web member of steel truss rod member is i shaped cross section, and other rod members of steel truss rod member are box-type section;
(2) bottom lateral bracing of steel truss rod member is i shaped cross section, and other rod members of steel truss rod member are box-type section;
Girder is combined using prestressing with bond steel bundle and external prestressing steel bundle;External prestressing is set at steel truss negative moment of girder Steel bundle.
2. rigid frame bridge according to claim 1, the top boom of described steel truss rod member passes through shear connector and concrete Floorings connect.
3. rigid frame bridge according to claim 1, described steel truss rod member is dismantled and assembled steel truss rod member.
4. rigid frame bridge according to claim 1, the thickness of the top board of described concrete box girder, the thickness of base plate and web Thickness be gradually reduced at maximum concrete cantilever by top of bridge pier fulcrum.
5. rigid frame bridge according to claim 1, described concrete box girder setting longitudinal prestressing steel bundle, transverse prestress steel Bundle, vertical prestressing steel bundle.
6. rigid frame bridge according to claim 1, described bridge pier is armored concrete double thin wall pier.
7. the construction party of the prestressed concrete as described in a kind of any one as claim 1 to 6-steel truss mixing continuous rigid frame bridge Method is it is characterised in that comprise the following steps:
(1) pile foundation and the construction of bridge pier are carried out;
(2) No. 0 block is poured on bridge pier, prestressed strand tensioning is carried out to No. 0 block;
(3) carry out cast-in-place and prestressed strand tensioning, each sections of the symmetrical casting concrete box beam in No. 0 block both sides on bridge pier;
(4) the end bay concrete box girder segment that method pours rigid frame bridge, end bay closure are set up using support, and carry out end bay prestressing force Steel Shu Zhangla;
(5) steel-concrete joint segment relies on Hanging Basket lifting to put in place;
(6) crane barge is adopted to set up method or the steel truss rod member of erection crane erection by protrusion erection main span span centre;
(7) lift the precast concrete floorings at steel truss girder top, pour wet seam;
(8) tensioning rigid frame bridge external prestressing steel bundle;
(9) appurtenant work and the deck paving of described rigid frame bridge are completed.
CN201410031894.0A 2014-01-23 2014-01-23 Prestressed concrete and steel truss mixed continuous rigid frame bridge and construction method thereof CN103758023B (en)

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