CN114934434A - Prefabricated steel truss concrete small box girder and prefabricated assembled type combined girder bridge comprising same - Google Patents
Prefabricated steel truss concrete small box girder and prefabricated assembled type combined girder bridge comprising same Download PDFInfo
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- CN114934434A CN114934434A CN202210735966.4A CN202210735966A CN114934434A CN 114934434 A CN114934434 A CN 114934434A CN 202210735966 A CN202210735966 A CN 202210735966A CN 114934434 A CN114934434 A CN 114934434A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 151
- 239000010959 steel Substances 0.000 title claims abstract description 151
- 239000004567 concrete Substances 0.000 title claims abstract description 40
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 48
- 239000002131 composite material Substances 0.000 claims abstract description 12
- 230000000712 assembly Effects 0.000 claims description 9
- 238000000429 assembly Methods 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 6
- 238000010276 construction Methods 0.000 description 12
- 238000004132 cross linking Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000009417 prefabrication Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 239000011513 prestressed concrete Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- OFCNXPDARWKPPY-UHFFFAOYSA-N allopurinol Chemical compound OC1=NC=NC2=C1C=NN2 OFCNXPDARWKPPY-UHFFFAOYSA-N 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 239000004576 sand Substances 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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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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
- E01D15/00—Movable or portable bridges; Floating bridges
- E01D15/12—Portable or sectional bridges
- E01D15/133—Portable or sectional bridges built-up from readily separable standardised sections or elements, e.g. Bailey 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
- E01D19/00—Structural or constructional details of bridges
- E01D19/04—Bearings; Hinges
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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
- E01D19/06—Arrangement, construction or bridging of expansion joints
- E01D19/067—Flat continuous joints cast in situ
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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
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for 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
- E01D6/00—Truss-type bridges
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Abstract
The invention discloses a prefabricated steel truss concrete small box girder and a prefabricated assembled composite girder bridge comprising the same, wherein the small box girder comprises a reinforced concrete top plate and a steel truss, the steel truss is arranged between the reinforced concrete top plate and a bridge support, the upper end of the steel truss is fixedly connected with the reinforced concrete top plate, the lower end of the steel truss is arranged on the bridge support, and the load is specially transferred to the bridge support; a prefabricated assembled combined beam bridge comprises a plurality of small box beams which are transversely arranged in parallel, and two adjacent small box beams are fixedly connected through a parallel assembly; the reinforced concrete top plate is supported on the bridge support through the steel truss, so that the self weight is reduced, the steel truss is suitable for larger span, and the anti-seismic performance is good; and a plurality of small box girders are transversely connected in parallel to form a combined bridge, and the load shared by the single small box girder is smaller, so that the bridge structure design is more flexible and efficient.
Description
Technical Field
The invention relates to the technical field of bridges, in particular to a prefabricated steel truss concrete box girder and a prefabricated assembled type combined girder bridge comprising the same.
Background
The steel truss concrete combination beam is a more common bridge structure form, has the advantages of larger spanning capacity and quicker construction progress compared with a prestressed concrete bridge, is generally constructed by adopting a method of forming a steel truss by bulk or hoisting large pieces of rod pieces in a bridge site and then pouring or installing a concrete top plate, has large on-site splicing workload, complicated working procedures, lower assembly degree and higher manufacturing cost, and therefore, the application of the bridge type in municipal administration and highway bridges is limited.
On the other hand, the conventional bridge with the span of about 20-60 m accounts for the vast majority of all bridges.
The prefabricated assembled prestressed concrete combined small box girder bridge and T-shaped girder bridge are most widely applied to conventional bridges due to mature technology, economic manufacturing cost and convenient construction, but have the defect of large self weight of the structure. Because the small box girder arranged longitudinally is not beneficial to earthquake resistance on one hand, the applicability is poor in high earthquake intensity areas; on the other hand, the spanning capability is limited, and the design specification of the existing highway bridge requires that the span of the prefabricated box girder does not exceed 40 m.
Therefore, in the common span range of 40-60 m, the economical and convenient prefabricated assembled box girder bridge is difficult to adopt, and a steel structure or a steel-concrete combined bridge is generally adopted, wherein the steel-concrete combined bridge is commonly used, but the steel-concrete combined bridge commonly used at present is low in industrialization and prefabrication degree, and particularly when the steel-concrete combined bridge is applied to a high pier bridge in a mountainous area, the erection difficulty is high, and the construction cost is obviously increased.
Disclosure of Invention
The invention aims to solve the technical problems that a conventional prefabricated assembled girder bridge is small in applicable span, large in weight and poor in anti-seismic performance, a conventional steel-concrete composite structure bridge is high in manufacturing cost and inconvenient to construct, and aims to provide a prefabricated steel truss concrete small box girder and a prefabricated assembled composite girder bridge comprising the same, which are light in weight, good in anti-seismic performance, large in applicable span, convenient to construct and low in manufacturing cost.
The invention is realized by the following technical scheme:
a precast steel truss concrete box girder, comprising:
a reinforced concrete top plate;
the steel truss is arranged between the reinforced concrete top plate and the bridge support, the upper end of the steel truss is fixedly connected with the reinforced concrete top plate, the lower end of the steel truss is arranged on the bridge support, and the load is transferred to the bridge support;
the steel truss includes:
the steel truss sheets are provided with upper edges and lower edges, and the upper edges of the two steel truss sheets are fixedly connected with the reinforced concrete top plate;
and the steel batten plates are arranged right below the reinforced concrete top plate, and the lower edges of the two steel truss sheets are fixedly connected with the steel batten plates.
Optionally, setting the reinforced concrete top plate to be provided with a first long side and a second long side along the longitudinal direction of the bridge, and further to be provided with a first short side and a second short side along the transverse direction of the bridge;
setting the steel batten plate to be provided with a first long edge and a second long edge along the longitudinal direction of the bridge, and also to be provided with a first short edge and a second short edge along the transverse direction of the bridge;
the two steel truss sheets are arranged on two sides of the center line of the reinforced concrete top plate and the steel batten plate, and the distance between the upper edges of the two steel truss sheets is larger than the distance between the lower edges of the two steel truss sheets.
Specifically, the steel truss sheet includes:
the lower chord is fixedly connected with the steel batten plate;
the upper side surface of the upper chord steel plate is welded with a shear connecting piece, and the upper chord steel plate is attached to and fixedly connected with the lower side surface of the reinforced concrete top plate through the shear connecting piece;
the web member is connected between the lower chord member and the upper chord steel plate and fixedly connected with the upper chord steel plate and the lower chord member;
wherein the steel batten plate is positioned between the two lower chords.
Further, two be provided with a plurality of stiffening ribs between the lower chord, it is a plurality of stiffening rib all with two the lower chord with steel lacing plate fixed connection, it is a plurality of stiffening rib's both ends all with the steel web member intersect in the node fixed connection of lower chord
Optionally, the truss type of the steel truss sheet adopts a pralat type, a Hualun type or a Hualun type with a vertical rod; the shear connector is one or more of a PBL shear key, a cylindrical head welding nail and a section steel connector.
Specifically, the steel truss with be provided with the base between the bridge beam supports, the downside of base with the bridge beam supports is connected, the side of going up of base be provided with the arc wall of lower chord adaptation.
A prefabricated assembled combined beam bridge comprises a plurality of prefabricated steel truss concrete box girders;
the small box girders are transversely arranged in parallel, and two adjacent small box girders are fixedly connected through a parallel assembly;
and the central axis of the small box girder is arranged along the longitudinal direction of the combined girder bridge.
Specifically, the parallel assembly includes:
a top concrete wet joint which is arranged between two adjacent reinforced concrete top plates and connects the two adjacent reinforced concrete top plates;
and the cross connection assembly is arranged between every two adjacent steel trusses and is fixedly connected with the steel trusses and the reinforced concrete top plate.
Optionally, the number of the cross-linking assemblies is multiple, and a connecting line between the multiple cross-linking assemblies is arranged along the longitudinal direction of the composite beam bridge.
Specifically, the cross-linking assembly comprises:
the horizontal connecting horizontal rod is horizontally arranged, and two ends of the horizontal connecting horizontal rod are respectively and fixedly connected with the lower edges of the two adjacent steel truss sheets;
the upper end of the transverse-connection inclined rod is respectively fixedly connected with the lower side surface of the reinforced concrete roof, and the lower end of the transverse-connection inclined rod is fixedly connected with the middle of the transverse-connection horizontal rod.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention can give full play to the material characteristics of steel and concrete, reduce the dead weight compared with the traditional prestressed concrete combined small box girder bridge and T girder bridge, is suitable for larger span, and has the advantages of good earthquake-proof performance, sand consumption saving, economy and environmental protection; compared with the conventional steel-concrete combined beam, the steel consumption is lower, the welding workload is less, the material cost and the welding labor cost of the steel consumption are reduced, the economic advantage is obvious, the factory prefabrication degree is high, the conventional bridging equipment can be adopted for installation, and the construction is more convenient.
The invention also connects a plurality of small box girders in parallel transversely to form an assembled bridge, adopts a combination form of a plurality of prefabricated small box girders which are broken into parts, the load shared by the single small box girder is smaller, steel members can generally adopt section steel, the matching of the member size and the structural stress is more efficient, the welding workload is greatly reduced, and both the steel truss nodes and the steel-concrete nodes are simplified, so the structural design of the bridge is more flexible and efficient.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 is a schematic structural view of a precast steel truss concrete box girder according to the present invention.
Fig. 2 is a schematic cross-sectional view of a prefabricated steel truss concrete box girder according to the present invention.
Figure 3 is another schematic cross-sectional view of a prefabricated steel truss concrete box girder according to the present invention.
Fig. 4 is a schematic cross-sectional view of a prefabricated assembled composite girder bridge according to the present invention.
Reference numerals are as follows: 1-bottom chord steel pipe, 2-steel batten plate, 3-steel web member, 4-top chord steel plate, 5-stiffening rib, 6-shear connector, 7-reinforced concrete top plate, 8-base, 9-horizontal rod, 10-horizontal diagonal rod and 11-top plate concrete wet joint.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the invention.
It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example one
As shown in fig. 1, the prefabricated steel truss concrete box girder comprises a reinforced concrete top plate 7 and a steel truss.
The steel truss is arranged between the reinforced concrete top plate 7 and the bridge support, the upper end of the steel truss is fixedly connected with the reinforced concrete top plate 7, and the lower end of the steel truss is arranged on the bridge support and is used for transferring load to the bridge support.
The steel truss is a steel structure and comprises steel truss sheets and steel batten plates 2.
For convenience of description, the steel truss sheet is set to have an upper side and a lower side.
The reinforced concrete roof 7 is provided with a first long edge and a second long edge along the longitudinal direction of the bridge, and a first short edge and a second short edge along the transverse direction of the bridge.
The setting steel gusset plate 2 has a first long side and a second long side in the longitudinal direction of the bridge, and also has a first short side and a second short side in the transverse direction of the bridge.
That is, the steel truss pieces, the reinforced concrete roof panel 7, and the gusset panel 2 are generally rectangular structures and have a long axis, which is a bridge span length.
The two steel truss sheets are arranged on two sides of the center line of the reinforced concrete top plate (7) and the steel batten plate (2), and the distance between the upper edges of the two steel truss sheets is larger than the distance between the lower edges of the two steel truss sheets.
That is, as shown in fig. 2, the reinforced concrete top plate 7, the steel gusset plate 2 and the two steel truss pieces constitute a quadrangular structure, and a specific structure is defined in order to maintain stability of the constituted small box girder, and a distance between upper edges of the two steel truss pieces is greater than a distance between lower edges of the two steel truss pieces. A trapezoid structure with a wide upper part and a narrow lower part is formed.
Example two
In this embodiment, the structure of the steel truss sheet is briefly described, and as shown in fig. 1, 2 and 3, the steel truss sheet includes a lower chord, an upper chord steel plate 4 and a web member 3.
The lower chord is fixed connection with the steel batten plate 2, and the steel batten plate 2 is located between two lower chords, and the lower chord is used for connecting steel batten plate 2 and steel web member 3.
The upper side surface of the upper chord steel plate 4 is welded with a shear connecting piece 6, the shear connecting piece 6 is attached to and fixedly connected with the lower side surface of the reinforced concrete top plate 7, the attachment tightness needs to be ensured in order to realize better connection, and the shear connecting piece 6 is one or more of a PBL shear key, a cylindrical head welding nail and a section steel connecting piece.
The steel truss sheets are connected between the lower chord and the upper chord steel plate 4 and fixedly connected with the upper chord steel plate 4 and the lower chord; the truss type of the steel truss sheet adopts a Pratt type, a Warren type or a Warren with vertical rods, and the invention provides the Pratt type Pratt truss type.
And, in order to increase the connection stability between the lower chord and the steel gusset plate 2, a plurality of stiffening ribs 5 are provided between the two lower chords, and the plurality of stiffening ribs 5 are all fixedly connected with the two lower chords and the steel gusset plate 2.
The number of the stiffening ribs 5 is multiple, and the arrangement can be carried out by a person skilled in the art according to the stress condition of the small box girder.
EXAMPLE III
In order to enable the two ends of the small box girder to be connected with the bridge support better, a base 8 is arranged between the steel truss and the bridge support, and the lower side surface of the base 8 is connected with the bridge support.
In order to effectively fix the steel truss by the base 8, the plane where the lower horizontal tangent line of the lower chord is located is set to be located below the steel batten plate 2, that is, as shown in fig. 2, an arc-shaped groove matched with the lower chord can be formed in the upper side of the base 8, and the lower half part of the lower chord is placed in the arc-shaped groove to realize positioning.
Example four
As shown in fig. 3, the present embodiment provides a prefabricated assembled composite girder bridge, which includes a plurality of prefabricated steel truss concrete box girders according to the first to third embodiments;
the small box girders are transversely arranged in parallel, two adjacent small box girders are fixedly connected through a parallel assembly, and the central axes of the small box girders are arranged along the longitudinal direction of the combined girder bridge.
The bridge deck width of the combined bridge can be controlled by controlling the number of the small box girders, and the two ends of the small box girders are directly arranged on the bridge lower structure through the bridge supports, so that the longitudinal splicing of a longer combined bridge can be realized.
In this embodiment, as shown in fig. 4, a plurality of box girders are connected in a single body by parallel assemblies.
After the small box girders are connected into a whole, the concrete leveling layer needs to be paved on the upper side surface of the reinforced concrete top plate 7, and then the road surface needs to be paved, so that the reinforced concrete top plate 7 in the first embodiment is generally horizontally arranged, but if the cross slope of the constructed bridge is large, the reinforced concrete top plate 7 can be made into a certain cross slope to adapt to the cross slope of the bridge.
The parallel modules include a roof concrete wet joint 11 and a cross-linking module.
The top plate concrete wet joint 11 is arranged between two adjacent reinforced concrete top plates 7, connects the two adjacent reinforced concrete top plates 7, and is used for being parallel and level to the upper side surfaces of the reinforced concrete top plates 7 and forming a top surface for connecting bridge deck pavement.
The cross connection component is arranged between two adjacent steel trusses and is fixedly connected with the steel trusses and the reinforced concrete top plate 7. The number of the transverse connection assemblies is multiple, and connecting lines among the transverse connection assemblies are arranged along the longitudinal direction of the combined beam bridge. And the two ends of the transverse connection assemblies arranged at intervals are respectively fixedly connected with the two adjacent small box girders, and the two adjacent small box girders are fixedly connected through the transverse connection assemblies.
As shown in fig. 4, the cross-link assembly includes a cross-link horizontal rod 9 and a cross-link diagonal rod 10.
The transverse horizontal rod 9 is horizontally arranged, and two ends of the transverse horizontal rod 9 are respectively and fixedly connected with the lower sides of the two adjacent steel truss sheets; for the stability of the connection, it is possible to arrange the transverse horizontal rods 9 at positions in the transverse direction of the bridge on the same line as the axis of the stiffening ribs 5.
The cross-linked diagonal rods 10 are obliquely arranged, the upper ends of the two cross-linked diagonal rods 10 are fixedly connected with the lower side surfaces of the two adjacent reinforced concrete roofs 7 respectively, and the lower ends of the two cross-linked diagonal rods 10 are fixedly connected with the middle of the cross-linked horizontal rod 9. The two cross-linked diagonal rods 10 form a V-shaped structure, so that the horizontal rod of the cross beam and the reinforced concrete top plate 7 can be conveniently stabilized, and the connection stability between the reinforced concrete top plate 7 of one small box girder and the steel batten plate 2 of the adjacent small box girder can be improved.
The above-mentioned concrete structure of the transverse connection assembly is effective in the actual use of the transverse connection structure capable of reliably connecting a plurality of small box girders into a whole, and the truss type and beam type structures can be selected by those skilled in the art according to the actual conditions.
The lower chord member, the web member 3, the horizontal cross-linking rod 9 and the inclined cross-linking rod 10 of the steel truss can adopt different section types such as round steel tubes, square steel tubes, I-shaped steel, H-shaped steel, welded box-shaped rod members and the like.
Example four
The present embodiment provides the prefabrication and installation method of the above embodiment.
The prefabricated assembled composite beam bridge includes two parts of design and construction.
The design system is based on the concept of the bridge type, bridge span arrangement and main sizes of all parts are planned according to bridge construction conditions, road grades and technical standards, and design and checking calculation are carried out according to the current bridge design specification regulations in China so as to meet the requirements of structural safety and use functions.
Prefabricating a single-piece beam: prefabricating in a factory or a beam making field, wherein the main prefabricating procedures are as follows: preparing prefabricated small box girders, a jig frame, a pedestal, a support and a template → processing and manufacturing each steel member of the steel truss → splicing and installing the steel members on the pedestal and the support splicing and supporting frame [ the jig frame ] to form the steel truss and fixing → installing a reinforced concrete top plate 7 support and the template → installing top plate steel bars → pouring top plate concrete → concrete curing → steel structure coating → completing the prefabrication of the steel truss concrete small box girders → moving the prefabricated small box girders to a girder storage area or transporting the prefabricated small box girders to a bridge site to be installed.
Erection and installation on site: transporting the prefabricated small box girders required by each bridge to a bridge construction site → erecting each small box girder on a bridge support by using a bridge erecting machine or a crane according to the designed position and sequence → carrying out transverse connection between the small box girders in each bridge and bridge floor joint construction, forming the whole bridge-spanning bridge → carrying out structural continuous construction between bridge spans or bridge floor continuous construction → carrying out bridge auxiliary structure and bridge floor paving construction → completing the construction of the upper structure of the prefabricated assembled steel truss concrete combined small box girder bridge in the designed range.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of description and are not intended to limit the scope of the invention. It will be apparent to those skilled in the art that other variations or modifications may be made on the above invention and still be within the scope of the invention.
Claims (10)
1. The utility model provides a little case roof beam of prefabricated steel purlin concrete which characterized in that includes:
a reinforced concrete top plate (7);
the steel truss is arranged between the reinforced concrete top plate (7) and the bridge support, the upper end of the steel truss is fixedly connected with the reinforced concrete top plate (7), and the lower end of the steel truss is arranged on the bridge support and is used for transferring load to the bridge support;
the steel truss comprises:
the steel truss sheets are provided with upper edges and lower edges, and the upper edges of the two steel truss sheets are fixedly connected with the reinforced concrete top plate (7);
and the steel batten plate (2) is arranged right below the reinforced concrete top plate (7), and the lower edges of the two steel truss sheets are fixedly connected with the steel batten plate (2).
2. A prefabricated steel truss concrete box girder according to claim 1, wherein said reinforced concrete roof slab (7) is set to have a first long side and a second long side in a longitudinal direction of the bridge and a first short side and a second short side in a transverse direction of the bridge;
setting the steel batten plate (2) to be provided with a first long edge and a second long edge along the longitudinal direction of the bridge, and also to be provided with a first short edge and a second short edge along the transverse direction of the bridge;
the two steel truss sheets are arranged on two sides of the center line of the reinforced concrete top plate (7) and the steel batten plate (2), and the distance between the upper edges of the two steel truss sheets is larger than the distance between the lower edges of the two steel truss sheets.
3. The precast steel truss concrete box girder of claim 1, wherein the steel truss piece comprises:
the lower chord is fixedly connected with the steel batten plate (2);
the upper side surface of the upper chord steel plate (4) is welded with a shear connecting piece (6), and the upper chord steel plate is attached and fixedly connected with the lower side surface of the reinforced concrete top plate (7) through the shear connecting piece (6);
the steel web member (3) is connected between the lower chord member and the upper chord steel plate (4) and is fixedly connected with the upper chord steel plate (4) and the lower chord member;
wherein the steel batten plate (2) is positioned between the two lower chords.
4. The precast steel truss concrete box girder of claim 3, wherein a plurality of stiffening ribs (5) are arranged between two lower chords, the stiffening ribs (5) are fixedly connected with the two lower chords and the steel gusset plate (2), and both ends of the stiffening ribs (5) are fixedly connected with the steel web members (3) at the joints of the lower chords.
5. The precast steel truss concrete box girder of claim 3, wherein the truss type of the steel truss sheet is of a pralat type, a Hualun type or a Hualun type with a vertical rod; the shear connector (6) is one or more of a PBL shear key, a cylindrical head welding nail and a section steel connector.
6. A prefabricated steel truss concrete box girder according to claim 3, characterized in that a base (8) is arranged between the steel truss and the bridge beam support, the lower side of the base (8) is connected with the bridge beam support, and the upper side of the base (8) is provided with an arc-shaped groove adapted to the lower chord.
7. A prefabricated assembled composite girder bridge comprising a plurality of prefabricated steel truss concrete box girders according to any one of claims 1 to 6;
the small box girders are transversely arranged in parallel, and two adjacent small box girders are fixedly connected through a parallel assembly;
and the central axis of the small box girder is arranged along the longitudinal direction of the combined girder bridge.
8. The precast assembled composite girder bridge according to claim 7, wherein the parallel assembly comprises:
a top concrete wet joint (11) which is arranged between two adjacent reinforced concrete top plates (7) and connects the two adjacent reinforced concrete top plates (7);
and the cross connection assembly is arranged between two adjacent steel trusses and is fixedly connected with the steel trusses and the reinforced concrete top plate (7).
9. The prefabricated assembled composite girder bridge according to claim 8, wherein the number of the cross connection assemblies is plural, and a connecting line between the plural cross connection assemblies is arranged along a longitudinal direction of the composite girder bridge.
10. The precast assembled composite girder bridge according to claim 8, wherein the crosslinkage assembly comprises:
the horizontal connecting horizontal rod (9) is horizontally arranged, and two ends of the horizontal connecting horizontal rod (9) are respectively and fixedly connected with the lower sides of the two adjacent steel truss sheets;
the upper end of the cross-linked diagonal rod (10) is respectively and adjacently connected with two lower side face fixed connections of the reinforced concrete top plate (7), and the lower ends of the cross-linked diagonal rod (10) are fixedly connected with the middle of the cross-linked horizontal rod (9).
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| CN115387537A (en) * | 2022-09-13 | 2022-11-25 | 傅银新 | Frame beam structure |
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