CN113005874A - Beam-arch combined bridge adopting steel truss-concrete prefabricated combined beam section and construction method - Google Patents
Beam-arch combined bridge adopting steel truss-concrete prefabricated combined beam section and construction method Download PDFInfo
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- CN113005874A CN113005874A CN202110412738.9A CN202110412738A CN113005874A CN 113005874 A CN113005874 A CN 113005874A CN 202110412738 A CN202110412738 A CN 202110412738A CN 113005874 A CN113005874 A CN 113005874A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 183
- 239000010959 steel Substances 0.000 title claims abstract description 183
- 239000004567 concrete Substances 0.000 title claims abstract description 100
- 238000010276 construction Methods 0.000 title claims abstract description 41
- 239000002131 composite material Substances 0.000 claims abstract description 20
- 239000011178 precast concrete Substances 0.000 claims description 42
- 238000003466 welding Methods 0.000 claims description 8
- 238000004873 anchoring Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000005304 joining Methods 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract 1
- 239000000725 suspension Substances 0.000 description 7
- 238000012423 maintenance Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D4/00—Arch-type bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
本发明公开了一种采用钢桁‑砼预制结合梁段的梁拱组合桥及施工方法，其结构包括混凝土梁段、钢桁‑混凝土预制结合梁段和梁段结合区，所述钢桁‑混凝土预制结合梁段由多个顺桥向的预制节段组成，相邻预制节段之间由多重连接结构进行固定，预制节段包括钢桁部和混凝土部；其施工方法，包括以下步骤：工厂内预加工钢桁部；混凝土部与钢桁部结合形成预制节段；现场施工混凝土梁段和梁段结合区；安装预制节段并进行节段连接；张拉预应力钢束；施工拱肋；安装吊杆。本发明中跨部分主梁节段用钢桁—混凝土结合梁替代混凝土主梁，节段重量轻，便于工厂预制和运输，且节段个数少、施工速度快，对跨越对象影响小，并提高了梁拱组合桥的适用跨度和应用范围。
The invention discloses a beam-arch composite bridge adopting steel truss-concrete prefabricated combined beam sections and a construction method. The concrete prefabricated combined beam segment is composed of a plurality of prefabricated segments along the bridge direction, the adjacent prefabricated segments are fixed by multiple connection structures, and the prefabricated segments include a steel truss portion and a concrete portion; the construction method includes the following steps: Prefabricated steel trusses in the factory; concrete and steel trusses are combined to form prefabricated segments; on-site construction of concrete beam segments and beam segment junction areas; installation of prefabricated segments and connection of segments; tensioning of prestressed steel bundles; construction of arches Ribs; install boom. The steel truss-concrete combined beam of the present invention replaces the concrete main beam with the steel truss-concrete combined beam. The applicable span and application range of the beam-arch composite bridge are improved.
Description
Technical Field
The invention belongs to the technical field of bridge structure buildings, and particularly relates to a beam-arch combined bridge with a steel truss-concrete prefabricated combined beam section and a construction method.
Background
The continuous beam-arch composite structure has the characteristics of high structural rigidity, good dynamic performance, high spanning capability, attractive appearance and the like, and is widely applied to the construction of high-speed railway bridges in China. The self weight of the bridge structure is borne by the main beam, and the second-stage constant load and live load in the main span range are borne by the stiffening arch.
Because the bridge type upper structure and the bridge type lower structure are connected by adopting the support, the large-span concrete continuous beam arch combined structure needs to adopt a large-tonnage bridge support, and the support manufacturing and maintenance cost is high; the beam body of the long-span concrete continuous beam-arch combined structure has heavy weight, and when the beam body is applied to a high-intensity seismic region, the seismic response is large, so that the design of piers and foundations is difficult; along with the increase of the span of the main span, the span of the side span main beam needs to be increased due to the balance of the weight of the middle span main beam and the arch, so that the rigidity of the side span main beam is reduced, and the requirement of a beam end corner cannot be met; in order to balance the horizontal thrust of the arch springing, a large amount of prestress is arranged in the concrete main beam, so that the beam body is greatly contracted and slowly changed, the smoothness of a track during the running of a high-speed railway is influenced, and the problem of down-warping exists in a long-term operating span; the span capacity and the application range are limited by the factors, and at present, a continuous beam-arch combined structure is less adopted for the span of more than 200 meters.
In addition, the girder of the large-span concrete continuous beam arch composite structure mostly adopts cantilever pouring construction, and because the height of the concrete girder is higher and the section weight is heavier, the construction is convenient, the number of the divided sections of the concrete girder is more, and the construction progress is influenced.
Disclosure of Invention
The invention aims to provide a beam-arch combined bridge adopting a steel truss-concrete prefabricated combined beam section and a construction method.
The technical scheme of the invention is as follows: a beam-arch combined bridge adopting a steel truss-concrete prefabricated combined beam section comprises a concrete beam section located at an edge span, a steel truss-concrete prefabricated combined beam section located at a middle span and a beam section combining area for connecting the steel truss-concrete prefabricated combined beam section and the beam section, wherein arch ribs and hanging rods are arranged on the steel truss-concrete prefabricated combined beam section, the steel truss-concrete prefabricated combined beam section consists of a plurality of prefabricated sections along the bridge direction, multiple connecting structures are used for fixing the adjacent prefabricated sections, and the prefabricated sections comprise a steel truss portion and a concrete portion.
The steel truss portion is including being located the steel roof on upper portion and the steel bottom plate that is located the lower part, be provided with the diagonal web member of slope between steel roof, the steel bottom plate, still be provided with vertical montant between steel roof, the steel bottom plate.
The oblique web members and the steel bottom plate are enclosed to form an isosceles triangle shape, and the oblique web members, the steel top plate and the vertical rods are enclosed to form a right-angled triangle shape.
The concrete part comprises a precast concrete top plate arranged at the upper end of the steel top plate and a precast concrete bottom plate arranged at the lower end of the steel bottom plate.
And pre-stressed steel beams along the bridge direction are arranged in the precast concrete top plate and the precast concrete bottom plate.
The multi-connection structure comprises splicing plates for fixing the steel top plate and the steel bottom plate between the adjacent prefabricated sections, and the splicing plates are fixed through pre-buried shear nail type bolts.
The embedded shear screw type bolt is embedded into the precast concrete top plate and the precast concrete bottom plate in one section, the embedded section of the embedded shear screw type bolt is provided with a fixing nut, and the fixing nut is welded on the steel top plate or the steel bottom plate and plays roles of an anchoring bolt and a shear screw; the other section of the pre-embedded shear nail type bolt is exposed, and the exposed section is provided with a screw nut which is used for fixing the splice plates during the splicing construction of the prefabricated sections.
The multiple connection structure comprises bolts for fixing the adjacent vertical rods, and the bolts penetrate through the adjacent vertical rods and are fixed by screwing nuts; the multiple connection structure comprises a welding seam for fixing the binding surface of the adjacent vertical rods.
The beam section combining area is internally provided with an embedded anchor bolt which is fixed with a vertical rod on one side of the prefabricated section; and the beam section combining area is also provided with an embedded steel top plate and an embedded steel bottom plate which are fixedly assembled with the adjacent prefabricated sections.
A construction method of a beam-arch combined bridge adopting a steel truss-concrete prefabricated combined beam section comprises the following steps:
i.e. pre-processing the steel truss section
Oblique web members, vertical rods, steel top plates and steel bottom plates are machined in a factory, after machining is completed, the steel truss parts are assembled, and shear connectors are installed on the steel top plates and the steel bottom plates;
ii, combining the concrete part with the steel truss part to form a prefabricated segment
Binding steel bars above the steel top plate and below the steel bottom plate of the steel truss part respectively and pouring concrete to form a precast concrete top plate and a precast concrete bottom plate;
iii, constructing a concrete beam section and beam section combined area
The cast-in-place construction of a concrete beam section and a beam section combination area is completed in advance at a bridge position; and the prefabricated sections are transported to the bridge site by land or water;
iv, installing the prefabricated segment
The steel truss-concrete prefabricated combined beam section is constructed by cantilever assembly, and prefabricated sections are fixed section by section;
v. stretching prestressed steel beam
Tensioning the prestressed steel bundles in the precast concrete top plate and the precast concrete bottom plate, and carrying out hoisting construction on the next precast segment;
vi. construction arch rib
After the main beams are closed, the bridge deck is used as a supporting platform to complete arch rib construction;
mounting hanger rod
And after the closure of the arch rib is finished, installing and tensioning a suspender between the arch rib and the steel truss-concrete prefabricated combination beam section to finish the construction of the main bridge.
The steel truss-concrete combined beam is used for replacing a concrete main beam for the span part of the main beam section, the section is light in weight, convenient to prefabricate and transport in a factory, small in number, small in field operation amount, high in construction speed and small in influence on crossing objects such as overpasses and rivers.
The main bridge structure has the advantages of small dead weight, small support tonnage, low support manufacturing and maintenance cost and contribution to seismic design, and the bridge type can be popularized and applied to high-intensity seismic areas.
The span part of the invention adopts a combined structure of the steel truss, the precast concrete bridge deck and the bottom plate, the creep after construction is smaller, the smoothness of the track is good, and the safety, the stability and the comfort of the high-speed train can be ensured.
The side span of the invention adopts the concrete beam, thus retaining the advantage of large side span rigidity of the concrete continuous beam-arch composite structure and better controlling the beam section corner; because midspan girder is lighter relative concrete continuous beam arch integrated configuration weight, the side span can further shorten, and the side span is than littleer, can save the material quantity.
The span precast beam section of the invention adopts the steel truss-concrete combination beam, the top plate and the bottom plate both adopt concrete structures, and the side span and the midspan part of the main beam also adopt concrete structures, thereby having more remarkable economic advantages and larger integral rigidity compared with a continuous steel truss beam arch combination structure.
Drawings
FIG. 1 is a schematic view of the overall structure of a V-brace type beam arch of the present invention;
FIG. 2 is a schematic view of the overall structure of the arch of the present invention;
FIG. 3 is a schematic view of the vertical arrangement of the steel truss-concrete precast bonded beam section according to the present invention;
FIG. 4 is a schematic cross-sectional view of I-I and II-II of FIG. 3;
FIG. 5 is a schematic cross-sectional view of III-III of FIG. 3;
FIG. 6 is a schematic view of a joint configuration between adjacent segments in accordance with the present invention;
FIG. 7 is a schematic cross-sectional view of IV-IV in FIG. 6;
FIG. 8 is a schematic view of a connection structure between a beam section joint area and a steel truss-concrete precast combined beam section according to the present invention;
FIG. 9 is a schematic cross-sectional view of V-V in FIG. 8;
wherein:
1 steel truss-concrete prefabricated combined beam section and 2 concrete beam sections
3 Beam segment joining region 4 Arch Ribs
5 boom
1-1 precast concrete top plate 1-2 precast concrete bottom plate
1-3 steel top plate and 1-4 steel bottom plate
1-5 diagonal web member 1-6 vertical bar
1-7 suspender lug plate 1-8 shear connector
1-9 prestressed steel strand
3-1 rear anchor plate 3-2 bearing plate
3-3 pre-embedded anchor bolts 3-4 pre-embedded steel top plate
3-5 embedded steel base plate 3-6 bearing plate shear connector
7-1 pre-embedded shear screw type bolt 7-2 splice plate
7-3 bolt 7-4 weld
7-5 shear key.
Detailed Description
The present invention is described in detail below with reference to the accompanying drawings and examples:
as shown in fig. 1 to 9, a girder-arch composite bridge using a steel truss-concrete prefabricated composite girder segment includes a concrete girder segment 2 located at an edge span, a steel truss-concrete prefabricated composite girder segment 1 located at a mid span, and a girder segment connecting area 3 connecting the two, wherein an arch rib 4 and a hanger rod 5 are provided on the steel truss-concrete prefabricated composite girder segment 1, the steel truss-concrete prefabricated composite girder segment 1 is composed of a plurality of prefabricated segments along a bridge direction, adjacent prefabricated segments are fixed by a multi-connection structure, and the prefabricated segments include a steel truss portion and a concrete portion.
The steel truss part comprises steel top plates 1-3 located on the upper portion and steel bottom plates 1-4 located on the lower portion, inclined web members 1-5 are arranged between the steel top plates 1-3 and the steel bottom plates 1-4, and vertical rods 1-6 are further arranged between the steel top plates 1-3 and the steel bottom plates 1-4.
The inclined web members 1-5 and the steel bottom plates 1-4 are enclosed to form an isosceles triangle shape, and the inclined web members 1-5, the steel top plates 1-3 and the vertical rods 1-6 are enclosed to form a right triangle shape.
The concrete part comprises a precast concrete top plate 1-1 arranged at the upper end of a steel top plate 1-3 and a precast concrete bottom plate 1-2 arranged at the lower end of a steel bottom plate 1-4.
Prestressed steel bundles 1-9 along the bridge direction are arranged in the precast concrete top plate 1-1 and the precast concrete bottom plate 1-2.
The multi-connection structure comprises splicing plates 7-2 for fixing steel top plates 1-3 and steel bottom plates 1-4 between adjacent prefabricated sections, and the splicing plates 7-2 are fixed through embedded shear nail type bolts 7-1.
One section of the pre-embedded shear screw type bolt 7-1 is pre-embedded into the precast concrete top plate 1-1 and the precast concrete bottom plate 1-2, a fixing nut is arranged on the pre-embedded section of the pre-embedded shear screw type bolt 7-1 and is welded on the steel top plate 1-3 or the steel bottom plate 1-4, and the functions of an anchoring bolt and a shear screw are played simultaneously; the other section of the pre-embedded shear nail type bolt 7-1 is exposed, and a screwed nut is arranged on the exposed section and used for fixing the splice plate 7-2 during the assembly construction of the prefabricated sections.
The multiple connection structure comprises bolts 7-3 for fixing the adjacent vertical rods 1-6, and the bolts 7-3 penetrate through the adjacent vertical rods 1-6 and are fixed by screwing nuts; the multiple connection structure comprises welding seams 7-4 for fixing the binding surfaces of the adjacent vertical rods 1-6.
The beam section combining area 3 is internally provided with pre-embedded anchor bolts 3-3, and the pre-embedded anchor bolts 3-3 are fixed with vertical rods 1-6 on one side of the prefabricated sections; and the beam section combination area 3 is also provided with embedded steel top plates 3-4 and embedded steel bottom plates 3-5 which are assembled and fixed with the adjacent prefabricated sections.
The beam section combination area 3 comprises a rear anchor plate 3-1, a bearing plate 3-2, pre-embedded anchor bolts 3-3, a pre-embedded steel top plate 3-4, a pre-embedded steel bottom plate 3-5, a bearing plate shear connector 3-6, pre-stressed steel beams 1-9 and outer-wrapped concrete.
One end of the pre-embedded anchor bolt 3-3 is pre-embedded into the web plate concrete of the beam section combination area 3 and is anchored on the rear anchor plate 3-1, and the other end of the pre-embedded anchor bolt passes through the bearing plate 3-2 between the web member 1-6 and the web plate concrete and is used for connecting and fixing the web member 1-6 during segment assembling construction.
Furthermore, the web plates of the web members 1-6 and the bearing plates 3-2 are secondarily connected by welding seams 7-4.
The beam section combining area 3 is provided with a rear anchor plate 3-1, a bearing plate 3-2, pre-embedded anchor bolts 3-3, a pre-embedded steel top plate 3-4 and a pre-embedded steel bottom plate 3-5.
The embedded steel top plate 3-4 and the embedded steel bottom plate 3-5 of the beam section combination area 3 are connected with the steel top plate 3-4 and the steel bottom plate 3-5 of the steel truss-concrete prefabricated combination beam section 1 through embedded shear nail type bolts 7-1 and splicing plates 7-2.
The steel truss-concrete prefabricated combined beam section 1 adopts a triangular truss.
Wherein, the diagonal web members 1-5 are I-shaped or box-shaped sections, the vertical rods 1-6 are C-shaped sections, and the diagonal web members 1-5 and the vertical rods 1-6 are welded with the steel top plate 1-3 and the steel bottom plate 1-4.
The steel top plate 1-3 and the steel bottom plate 1-4 are respectively connected with the precast concrete top plate 1-1 and the precast concrete bottom plate 1-2 through shear connectors 1-8.
Pipelines for the pre-stressed steel beams 1-9 to pass through are reserved in the pre-cast concrete top plate 1-1 and the pre-cast concrete bottom plate 1-2; the steel truss-concrete prefabricated combined beam section 1 is also provided with suspender lugs 1-7, one end of each suspender lug 1-7 is welded with the shear connectors 1-8 into a whole, and the other end is connected with the suspender 5.
The steel truss-concrete prefabricated combined beam section 1 is divided into a plurality of same sections along the longitudinal direction of the main bridge, and the steel top plates 1-3 and the steel bottom plates 1-4 of the adjacent sections are connected through embedded shear nail type bolts 7-1 and splicing plates 7-2.
Further, bolts 7-3 and welding seams 7-4 are adopted between the vertical rods 1-6 of the adjacent sections for double connection.
Furthermore, the precast concrete top plates 1-1 and the precast concrete bottom plates 1-2 of the adjacent sections are longitudinally connected by prestressed steel bundles 1-9.
And a shear key 7-5 is arranged at the joint of the concrete parts of the adjacent prefabricated sections, and the shear keys 7-5 are vertically connected.
And uniformly coating the sealing glue for the bridge at the joint between the connected sections.
The splice plates 7-2 are stacked at the lower ends of the adjacent steel top plates 1-3 and the upper ends of the adjacent steel bottom plates 1-4.
One end of the pre-embedded shear nail type bolt 7-1 is pre-embedded into the precast concrete top plate 1-1 or the precast concrete bottom plate 1-2, a fixing nut is arranged at the pre-embedded end and welded on the steel top plate 1-3 or the steel bottom plate 1-4, and meanwhile, the functions of an anchoring bolt and a shear nail are played; one end is exposed, and a screw nut is arranged at the exposed end and is used for connecting and fixing the splice plates 7-2 during segment assembling construction.
Bolt holes for bolts 7-3 to pass through are reserved in the webs of the vertical rods 1-6, after the bolts 7-3 are fastened, the shearing resistance is achieved, the webs of the vertical rods 1-6 between adjacent sections are tightly attached, and no gap is reserved between the webs when welding seams 7-4 are formed, so that the welding quality is guaranteed.
The suspension rod ear plates 1-7 are in a gusset plate form, an anchor plate form or a lifting lug form with a pin hole, and the suspension rod ear plates 1-7 are in a gusset plate form and are used for connecting a rigid suspension rod; the suspension rod ear plates 1-7 are in the form of anchor plates and are used for connecting flexible suspension cables; the suspension rod ear plates 1-7 are in a lifting lug form with pin holes and are used for connecting the suspension rod with the pin shaft.
Preferably, the boom ear plates 1-7 are arranged at the intersection of two diagonal web members 1-5.
The number of the main trusses in the steel truss-concrete prefabricated combined beam section 1 can be two, three or more, and the side main trusses can be perpendicular to the top bottom plate and can also be obliquely crossed with the top bottom plate.
The shear connectors 1-8 can be rigid connectors, such as section steel, PBL shear keys and the like; the shear connectors 1-8 can be flexible connectors, such as studs, bolts, steel bar shear keys, and the like; the shear connectors 1-8 can be frictional connectors, such as high-strength bolt connectors and the like; the shear connectors 1-8 can also be in a composite form of the shear connectors.
The steel truss-concrete prefabricated combined beam section 1, the beam section combining area 3, the arch rib 4 and the suspender 5 are arranged in the mid-span range.
And shear keys 7-5 for fixing are commonly arranged between the concrete beam sections 2 and the segments.
A construction method of a beam-arch combined bridge adopting a steel truss-concrete prefabricated combined beam section comprises the following steps:
i.e. pre-processing the steel truss section
1-5 parts of diagonal web members, 1-6 parts of vertical rods, 1-3 parts of steel top plates and 1-4 parts of steel bottom plates are processed in a factory, the diagonal web members, the vertical rods, the steel top plates and the steel bottom plates are assembled into a steel truss part after the diagonal web members, and 1-8 parts of shear connectors are arranged on the steel top plates 1-3 and the steel bottom plates 1-4;
ii, combining the concrete part with the steel truss part to form a prefabricated segment
Binding reinforcing steel bars above the steel top plate 1-3 and below the steel bottom plate 1-4 of the steel truss part respectively and pouring concrete to form a precast concrete top plate 1-1 and a precast concrete bottom plate 1-2;
iii, constructing a concrete beam section and beam section combined area
The cast-in-place construction of a concrete beam section 2 and a beam section combination area 3 is completed in advance at a bridge position; and the prefabricated sections are transported to the bridge site by land or water;
iv, installing the prefabricated segment
The steel truss-concrete prefabricated combined beam section 1 is constructed by cantilever assembly, and prefabricated sections are fixed section by section;
v. stretching prestressed steel beam
Tensioning the prestressed steel bundles 1-9 in the precast concrete top plate 1-1 and the precast concrete bottom plate 1-2, and carrying out next precast segment hoisting construction;
vi. construction arch rib
After the main beams are closed, the bridge deck is used as a supporting platform to complete the construction of the arch rib 4;
mounting hanger rod
And after the closure of the arch rib 4 is finished, installing and tensioning a suspender 5 between the arch rib 4 and the steel truss-concrete prefabricated combined beam section 1, and finishing the construction of the main bridge.
In step iv, the specific process for installing the prefabricated segments is as follows:
and before hoisting the segments in place, smearing bridge sealant at joints.
After the segments are hoisted in place, the splicing plates 7-2 and the matched nuts of the pre-embedded shear nail type bolts 7-1 are installed and the bolts are fastened; and (5) mounting and fastening web connecting bolts 7-3 of the web members, and welding connecting seams 7-4 at two sides of the web members.
Step vi, constructing the arch rib, and assembling the arch rib 4 by adopting a full-hall support method for the graph 1; referring to fig. 2, a temporary bracket is erected on the bridge deck to complete the assembly of the arch ribs 4, and a buckling tower and a buckling cable are arranged on the bridge deck with a middle pivot to perform the vertical rotation construction of the arch ribs 4.
The steel truss-concrete combined beam is used for replacing a concrete main beam for the span part of the main beam section, the section is light in weight, convenient to prefabricate and transport in a factory, small in number, small in field operation amount, high in construction speed and small in influence on crossing objects such as overpasses and rivers.
The main bridge structure has the advantages of small dead weight, small support tonnage, low support manufacturing and maintenance cost and contribution to seismic design, and the bridge type can be popularized and applied to high-intensity seismic areas.
The span part of the invention adopts a combined structure of the steel truss, the precast concrete bridge deck and the bottom plate, the creep after construction is smaller, the smoothness of the track is good, and the safety, the stability and the comfort of the high-speed train can be ensured.
The side span of the invention adopts the concrete beam, thus retaining the advantage of large side span rigidity of the concrete continuous beam-arch composite structure and better controlling the beam section corner; because midspan girder is lighter relative concrete continuous beam arch integrated configuration weight, the side span can further shorten, and the side span is than littleer, can save the material quantity.
The span precast beam section of the invention adopts the steel truss-concrete combination beam, the top plate and the bottom plate both adopt concrete structures, and the side span and the midspan part of the main beam also adopt concrete structures, thereby having more remarkable economic advantages and larger integral rigidity compared with a continuous steel truss beam arch combination structure.
Claims (10)
1. The utility model provides an adopt girder arch combination bridge of prefabricated combination beam section of steel purlin-concrete, is including concrete beam section (2) that are located the side span, the prefabricated combination beam section of steel purlin-concrete (1) that are located the midspan and connect beam section joining region (3) of the two, be provided with arch rib (4), jib (5) on the prefabricated combination beam section of steel purlin-concrete (1), its characterized in that: the steel truss-concrete prefabricated combined beam section (1) is composed of a plurality of prefabricated sections along the bridge direction, adjacent prefabricated sections are fixed through a multi-connection structure, and each prefabricated section comprises a steel truss portion and a concrete portion.
2. The beam-arch composite bridge adopting the steel truss-concrete prefabricated combined beam section as claimed in claim 1, wherein: the steel truss part comprises steel top plates (1-3) located on the upper portion and steel bottom plates (1-4) located on the lower portion, inclined web members (1-5) are arranged between the steel top plates (1-3) and the steel bottom plates (1-4), and vertical rods (1-6) are further arranged between the steel top plates (1-3) and the steel bottom plates (1-4).
3. The beam-arch composite bridge adopting the steel truss-concrete prefabricated combined beam section as claimed in claim 2, wherein: the inclined web members (1-5) and the steel bottom plates (1-4) are enclosed to form an isosceles triangle shape, and the inclined web members (1-5), the steel top plates (1-3) and the vertical rods (1-6) are enclosed to form a right triangle shape.
4. The bridge-arch composite bridge adopting the steel truss-concrete prefabricated combined beam section as claimed in claim 3, wherein: the concrete part comprises a precast concrete top plate (1-1) arranged at the upper end of the steel top plate (1-3) and a precast concrete bottom plate (1-2) arranged at the lower end of the steel bottom plate (1-4).
5. The bridge-arch composite bridge adopting the steel truss-concrete prefabricated combined beam section as claimed in claim 4, wherein: prestressed steel bundles (1-9) along the bridge direction are arranged in the precast concrete top plate (1-1) and the precast concrete bottom plate (1-2).
6. The beam-arch composite bridge adopting the steel truss-concrete prefabricated combined beam section as claimed in claim 2, wherein: the multi-connection structure comprises splicing plates (7-2) for fixing steel top plates (1-3) and steel bottom plates (1-4) between adjacent prefabricated sections, and the splicing plates (7-2) are fixed through embedded shear nail type bolts (7-1).
7. The bridge-arch composite bridge adopting the steel truss-concrete prefabricated combined beam section as claimed in claim 5, wherein: one section of the pre-embedded shear nail type bolt (7-1) is pre-embedded into the precast concrete top plate (1-1) and the precast concrete bottom plate (1-2), the pre-embedded section of the pre-embedded shear nail type bolt (7-1) is provided with a fixing nut, the fixing nut is welded on the steel top plate (1-3) or the steel bottom plate (1-4), and the functions of an anchoring bolt and a shear nail are exerted; the other section of the pre-embedded shear nail type bolt (7-1) is exposed, and a screwed nut is arranged on the exposed section and is used for fixing the splice plate (7-2) during the splicing construction of the prefabricated sections.
8. The bridge-arch composite bridge adopting the steel truss-concrete prefabricated combined beam section as claimed in claim 6, wherein: the multi-connection structure comprises bolts (7-3) for fixing adjacent vertical rods (1-6), and the bolts (7-3) penetrate through the adjacent vertical rods (1-6) and are fixed by screwing nuts; the multi-connection structure comprises welding seams (7-4) for fixing the binding surfaces of the adjacent vertical rods (1-6).
9. The bridge-arch composite bridge adopting the steel truss-concrete prefabricated combined beam section as claimed in claim 8, wherein: the beam section combining area (3) is internally provided with pre-buried anchor bolts (3-3), and the pre-buried anchor bolts (3-3) are fixed with vertical rods (1-6) on one side of the prefabricated sections; and the beam section combining area (3) is also provided with pre-embedded steel top plates (3-4) and pre-embedded steel bottom plates (3-5) which are assembled and fixed with the adjacent prefabricated sections.
10. A construction method of a beam-arch combined bridge adopting a steel truss-concrete prefabricated combined beam section is characterized in that: the method comprises the following steps:
preprocessing the steel truss part
Oblique web members (1-5), vertical rods (1-6), steel top plates (1-3) and steel bottom plates (1-4) are machined in a factory, steel truss parts are assembled after machining is finished, and shear connectors (1-8) are installed on the steel top plates (1-3) and the steel bottom plates (1-4);
(ii) the concrete section and steel truss section combine to form a prefabricated segment
Binding steel bars above the steel top plate (1-3) and below the steel bottom plate (1-4) of the steel truss part respectively and pouring concrete to form a precast concrete top plate (1-1) and a precast concrete bottom plate (1-2);
(iii) construction of concrete Beam section and Beam section Joint area
The cast-in-place construction of a concrete beam section (2) and a beam section combination area (3) is completed in advance at the bridge position; and the prefabricated sections are transported to the bridge site by land or water;
(iv) installing the prefabricated segments
The steel truss-concrete prefabricated combined beam section (1) is constructed by cantilever assembly, and prefabricated sections are fixed section by section;
(v) tensioning the prestressed steel strands
Tensioning the prestressed steel bundles (1-9) in the precast concrete top plate (1-1) and the precast concrete bottom plate (1-2) and carrying out hoisting construction on the next precast segment;
(vi) construction of arch Ribs
After the main beams are closed, the bridge deck is used as a supporting platform to complete the construction of the arch rib (4);
(vii) mounting hanger
After the closure of the arch rib (4) is finished, a suspender (5) is installed and tensioned between the arch rib (4) and the steel truss-concrete prefabricated combined beam section (1), and the construction of the main bridge is finished.
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