CN217758300U - Prefabricated combined small box girder structure - Google Patents

Abstract

The utility model relates to the technical field of bridge engineering, in particular to a prefabricated combined small box girder structure, which comprises a cast-in-place bridge deck, a plurality of U-shaped beams and a plurality of diaphragm beams; the cast-in-situ bridge deck is arranged at the upper end of the U-shaped beam; the U-shaped beams comprise bottom plates at the bottoms, two webs positioned at the two ends of the bottom plates and flange plates positioned at the upper edges of the webs, wet joints are arranged between the flange plates of the adjacent U-shaped beams, the wet joints and the diaphragm beam tie rods connect the adjacent U-shaped beams into a whole, and the two ends of the prefabricated combined small box beam structure are provided with the end blocking plates. The beneficial effects of the utility model reside in that: by adopting the structure, the structure size can be reduced, the self weight and the internal force of the structure are reduced, the spanning capability and the tensile capability of the bridge are improved, and the cracking probability of the combined box girder and the structural deformation under the load action are obviously reduced; compared with a steel structure, the steel structure has higher corrosion resistance, fire resistance and erosion resistance, and can improve the safety and durability of the structure.

Description

Prefabricated small combined box girder structure

Technical Field

The utility model relates to a bridge engineering technical field, concretely relates to prefabricated combination trabecula structure.

Background

The ultra-high performance concrete (UHPC for short) is a cement-based composite material with ultrahigh strength, high toughness, high durability and good volume stability, also has extremely low permeability, higher environmental medium erosion resistance and good wear resistance, can adapt to severe environment, and can effectively reduce the dead weight of the structure and improve the crack resistance of a bridge by adopting the UHPC in the structure. However, the difference between the elasticity modulus of the concrete and the elasticity modulus of common concrete is not large, and in order to reduce the self weight of the structure in the design, the structure size smaller than that of the common concrete member is usually adopted, and the undersized structure size easily causes the rigidity of the structure to be lower, so that the structure generates larger deformation.

In order to solve the problems, a prefabricated composite beam structure is provided, and UHPC is used in the structure, so that the structure has lighter self weight, smaller structure size, excellent mechanical property and spanning capability, is convenient for construction and hoisting, and is suitable for various engineering environments; meanwhile, the structure needs to have better durability than a steel structure and a traditional concrete structure so as to reduce the maintenance and repair cost in the middle and later periods of the project.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to solve the technical problems that: the prefabricated combined small box girder structure has the advantages of light self weight, small section size, convenience in construction, high bearing capacity and high rigidity.

In order to solve the technical problem, the utility model discloses a technical scheme be: the prefabricated combined small box girder structure comprises a cast-in-place bridge deck, a plurality of U-shaped girders and a plurality of transverse partition girders;

the cast-in-situ bridge deck is arranged at the upper end of the U-shaped beam; the U-shaped beam comprises a bottom plate at the bottom, two webs positioned at two ends of the bottom plate and a flange plate positioned at the upper edge of each web, steel ribs are arranged in the webs, two ends of each steel rib respectively extend into the flange plate and the bottom plate, and a baffle is arranged on the flange plate, close to the outer side, of the U-shaped beam positioned at the outermost side of the prefabricated combined small box girder structure;

the transverse partition beam comprises an inner transverse partition beam and a transverse partition beam tie rod, the inner transverse partition beam is supported and arranged on the inner side wall of the U-shaped beam, the transverse partition beam tie rod is connected between two adjacent U-shaped beam webs, wet joints are arranged between flange plates of adjacent U-shaped beams, the adjacent U-shaped beams are connected into a whole through the wet joints and the transverse partition beam tie rod, and plug plates are arranged at two ends of the prefabricated combined small box girder structure.

The cast-in-place bridge deck is internally provided with a top plate stirrup, a top plate longitudinal steel bar and a top plate prestressed steel bundle, the bottom plate is internally provided with a bottom plate stirrup, a bottom plate longitudinal steel bar and a bottom plate prestressed steel bundle, the web plate stirrup and the web plate longitudinal steel bar are arranged in the web plate, and the flange plate is internally provided with a flange plate stirrup and a flange plate longitudinal steel bar.

The thickness of the bottom plate is 0.15-0.3 m, the thickness of the web plate is 0.1-0.3 m, the thickness of the flange plate is 0.05-0.15 m, and the bottom plate, the web plate and the flange plate are all made of ultrahigh-performance concrete.

The transverse partition beam tie bars are rectangular in cross section, the length of the cross section is 0.3-0.4 m, the width of the cross section is 0.2-0.3 m, the transverse partition beams are arranged at support points at two ends of the U-shaped beam and are uniformly arranged at intervals of 10-20 m along the length direction of the U-shaped beam, the thickness of the plug plate is 0.08-0.2 m, the width of the wet joint is 0.45-0.9 m, and the transverse partition beam tie bars, the plug plate and the wet joint are all made of ultra-high performance concrete.

And the transverse partition beam tie bar is internally provided with a transverse partition beam tie bar stirrup, a transverse partition beam tie bar longitudinal steel bar and a transverse partition beam tie bar steel rib.

The thickness of the steel rib of the tie bar of the diaphragm beam is 0.02m-0.05m, and the tie bar is made of Q345b steel.

Wherein the thickness of the cast-in-place bridge deck is 0.1m-0.3m, and the material is common concrete.

The beneficial effects of the utility model reside in that: the prefabricated combined small box girder structure provided by the utility model can reduce the structure size, the structure dead weight and the structure internal force, improve the crossing capability and the tensile capability of a bridge and obviously reduce the cracking probability of the combined box girder and the structural deformation under the load action; compared with a steel structure, the steel structure has higher corrosion resistance, fire resistance and erosion resistance, and the safety and durability of the structure can be improved; both steel and UHPC are high-performance materials, and an SUHPC structure formed by combining the steel and the UHPC also has higher bearing capacity; all parts can be prefabricated in a factory and then transported to a site for hoisting, so that the site construction efficiency is greatly improved; because the structure dead weight is lighter, in the city construction environment that can't adopt large-scale hoisting equipment, also can adopt small-size hoisting equipment to carry out hoist and mount work.

Drawings

Fig. 1 is a schematic structural view of a prefabricated combined small box girder according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along line I-I of the side rail of FIG. 1;

FIG. 3 is a cross-sectional view taken along line I-I of the center sill of FIG. 1;

FIG. 4 is a cross-sectional reinforcement diagram of the side beam of the prefabricated combination box girder according to the embodiment of the present invention;

fig. 5 is a cross-sectional reinforcement diagram of the middle beam of the prefabricated small box girder according to the embodiment of the utility model;

FIG. 6 is a schematic structural view of a diaphragm beam of the prefabricated combined small box girder according to the embodiment of the present invention;

FIG. 7 is a schematic cross-sectional view of a tie bar of a prefabricated composite box girder according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a plug plate of a prefabricated combined small box girder according to an embodiment of the utility model;

FIG. 9 is a schematic view of a wet seam structure of a prefabricated composite box girder according to an embodiment of the present invention;

description of reference numerals:

1. casting a bridge deck in place; 11. a roof stirrup; 12. longitudinal steel bars of the top plate; 13. a top plate prestressed steel strand;

2. steel skeleton;

3. a U-shaped beam; 31. a base plate; 311. a base plate stirrup; 312. longitudinal reinforcing steel bars of the bottom plate; 313. a base plate prestress steel bundle; 32. a web; 321. web stirrups; 322. web longitudinal steel bars; 33. a flange plate; 331. a flange plate stirrup; 332. longitudinal steel bars of the flange plate; 34. a baffle plate;

4. a diaphragm beam; 41. an inner diaphragm beam; 42. a diaphragm beam tie bar; 421. a tie bar stirrup of a diaphragm beam; 422. longitudinal steel bars of the transverse beam tie bar; 423. the tie bar steel rib of the diaphragm beam;

5. a blanking plate; 51. steel bars of the plug board;

6. wet seaming; 61. wet joint rebar.

Detailed Description

In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.

Referring to fig. 1 to 9, a prefabricated combined small box girder structure includes a cast-in-place bridge deck 1, a plurality of U-shaped beams 3 and a plurality of transverse partition beams 4;

the cast-in-place bridge deck 1 is arranged at the upper end of the U-shaped beam 3, the cast-in-place bridge deck 1 can be used as a bridge deck pavement layer of a bridge, a top plate stirrup 11 and a top plate longitudinal steel bar 12 are arranged in the cast-in-place bridge deck, a top plate prestress steel beam 13 is required to be arranged only when the bridge forming system of the bridge is a continuous system, and the existing top plate prestress steel beam 13 is not arranged if the bridge forming system of the bridge is a simple support system;

the U-shaped beam 3 comprises a bottom plate 31 at the bottom, two webs 32 positioned at two ends of the bottom plate 31 and a flange plate 33 positioned at the upper edge of each web 32, steel ribs 2 are arranged in the webs 32, two ends of each steel rib 2 respectively extend into the flange plates 33 and the bottom plate 31, and a baffle plate 34 is arranged on the flange plate 33, close to the outer side, of the U-shaped beam 3 positioned at the outermost side of the prefabricated combined small box girder structure;

the bottom plate 31 is internally provided with a bottom plate stirrup 311, a bottom plate longitudinal steel bar 312 and a bottom plate prestressed steel beam 313, the web plate 32 is internally provided with a web plate stirrup 321 and a web plate longitudinal steel bar 322, and the flange plate 33 is internally provided with a flange plate stirrup 331 and a flange plate longitudinal steel bar 332. The bottom plate 31, the web plate 32 and the flange plate are all made of ultra-high performance concrete.

The diaphragm beams 4 comprise inner diaphragm beams 31 and diaphragm beam tie rods 42, the inner diaphragm beams 31 are supported and arranged on the inner side walls of the U-shaped beams 3, and the diaphragm beam tie rods 42 are connected between the webs of two adjacent U-shaped beams 3.

The transverse partition beam 4 is of a cast-in-place structure, is arranged at supporting points at two ends of the U-shaped beam 3, and a plurality of the rest transverse partition beams are uniformly arranged between the two webs 32 along the length direction of the U-shaped beam 3, and comprises an inner transverse partition beam 41 arranged inside the small box girder and transverse partition beam tie bars 42 arranged outside the small box girder, wherein the number of the transverse partition beam tie bars 42 is 3, and transverse partition beam tie bar stirrups 421, transverse partition beam tie bar longitudinal steel bars 422 and transverse partition beam tie bar steel ribs 423 are arranged in the transverse partition beam tie bars 42;

and wet joints 6 are arranged between flange plates of adjacent U-shaped beams 3, the adjacent U-shaped beams 3 are connected into a whole by the wet joints 6 and the transverse beam tie rods 42, and plug plates 5 are arranged at two ends of the prefabricated combined small box beam structure. Plug plates 5 are arranged near the fulcrums at the two ends of the prefabricated combined small box girder structure, and the small box girders are connected into a whole through wet joints 6 and transverse partition beams 4 in the transverse bridge direction; the plug plate 5 is of a prefabricated structure, and plug plate steel bars 51 are arranged in the plug plate; the wet joint 6 is a cast-in-place structure and is internally provided with wet joint reinforcing steel bars 61.

As can be seen from the above description, the integrity of the main girder of the bridge can be improved by connecting the prefabricated small box girders together through the diaphragm girders 4 and the wet joints 6, so that the main girders can participate in the stress well.

The flange plate, close to the outer side, of the U-shaped beam 3 positioned on the outermost side of the prefabricated small box girder structure is provided with a baffle 34, and the U-shaped beam is an edge beam; the other U-shaped beams are middle beams, the baffle 34 does not need to be arranged, and hoisting reserved holes are formed in web plates of the U-shaped beams. The two flange plates 33 and the baffle plates 34 of the U-shaped beam can be used as construction templates of the cast-in-place bridge deck 1 and the wet joint 6;

according to the description, one part of the prefabricated combined small box girder is used as a template, and the cast-in-place bridge deck slab 1 is used as a bridge deck pavement layer of a bridge, so that the construction steps are simplified, the materials are saved, and the construction cost and the construction period are reduced.

Further, in the prefabricated combined small box girder structure, the steel rib 2 is arranged in two webs 32 of the U-shaped girder 3, holes are formed in the contact positions of the steel rib 2 and the flange plate stirrups 331 and the web plate stirrups 321, a PBL (PBL) connection mode is adopted, the contact positions of the steel rib 2 and the bottom plate stirrups 331 are welded, and the steel rib 2 and the bottom plate stirrups 331 are fixed in the two modes to form an integral framework.

As can be seen from the above description, holes are formed at the contact positions of the steel rib and the flange plate stirrups 331 and the web plate stirrups 321, a PBL connection form is adopted, and welding is performed at the contact positions of the steel rib 2 and the bottom plate stirrups 331, so that the flange plate stirrups 331, the web plate stirrups 321 and the bottom plate stirrups 331 can be conveniently fixed, and the top plate steel bars 12, the web plate longitudinal steel bars 322 and the bottom plate longitudinal steel bars 312 can be conveniently bound; from the point of stress and structure, the slippage between the steel rib and the concrete material is prevented, so that the steel rib can take part in the bearing more fully,

further, in the above prefabricated small combined box girder structure, the thickness of the bottom plate 31 is 0.15m to 0.3m, the thickness of the single-side web plate 32 is 0.1m to 0.3m, the thickness of the single flange plate 33 is 0.05m to 0.15m, and the bottom plate 31, the web plate 32 and the flange plate 33 are all made of ultra-high performance concrete.

Furthermore, in the prefabricated combined small box girder structure, the diaphragm beam tie rod 42 has a rectangular cross section, the length of the cross section is 0.3m to 0.4m, the height of the cross section is 0.2m to 0.3m, the diaphragm beam 4 must be arranged at the supporting points of two sides of the U-shaped beam 3, the rest of the cross section is uniformly arranged along the length direction of the U-shaped beam 3 at intervals of 10m to 20m, the thickness of the plug plate 5 is 0.08m to 0.2m, the width of the wet joint 6 is 0.45m to 0.9m, and the materials of the diaphragm beam 4, the plug plate 5 and the wet joint 6 are all ultrahigh-performance concrete;

further, in the prefabricated combined small box girder structure, the thickness of the cast-in-place bridge deck 1 is 0.1m-0.3m, and the material is common concrete;

further, in the prefabricated combined small box girder structure, the thickness of the steel rib 2 is 0.02m-0.05m, and the steel rib is made of Q345b type steel;

furthermore, in the prefabricated combined small box girder structure, the thickness of the tie bar steel rib 423 of the transverse beam is 0.02m to 0.05m, and the tie bar steel rib is made of Q345b type steel.

The construction method for the prefabricated combined small box girder structure comprises the following steps:

the method comprises the following steps: determining the span of the bridge and a bridge system, and determining the specific size of each part according to the span.

Step two: connecting the steel ribs 2 at the contact parts of the steel ribs 2 and the flange plate stirrups 331 and the web plate stirrups 321 in a PBL mode by taking 2-5m as a segment, and welding the steel ribs 2 at the contact parts of the steel ribs 2 and the bottom plate stirrups 311; then, all the segments are connected by welding, and the web longitudinal steel bar 322, the bottom plate longitudinal steel bar 312 and the flange plate longitudinal steel bar 332 are bound to form an integral steel rib and steel bar framework; at the same time, the plugging plate 5 is prefabricated in advance;

step three: pouring a bottom plate 31, two web plates 32, a flange plate 33, baffles 34 on the boundary beams and an inner transverse partition beam 41 of the U-shaped beam 3; after the material reaches the strength value specified by the specification, tensioning the prestressed steel beam 313 of the bottom plate;

step four: hoisting the structure to the designed main beam position by using hoisting equipment, pouring the inner transverse partition beams 41 and the wet joints 6, installing the prefabricated plug plates 5, connecting all the small box beams into a whole, and then beginning to pour the cast-in-place bridge deck 1; if the bridge forming system of the bridge is a continuous system, a top plate prestressed steel strand 13 is required to be arranged, and the top plate prestressed steel strand 13 is tensioned after the material reaches the strength value specified by the specification; if the bridge forming system of the bridge is a simple support system, the prestressed steel bundles 13 of the tensioning top plate are not required to be arranged.

Example one

Referring to fig. 1 to 9, a prefabricated combination box girder structure includes a cast-in-place bridge deck 1, a plurality of U-shaped beams 3 and a plurality of diaphragm beams 4;

the prefabricated combined small box girder structure is provided with plug plates 5 near fulcrums at two sides of the girder, and the U-shaped girders 3 are connected into a whole through wet joints 6 and transverse clapboards 4 in the transverse bridge direction;

the cast-in-place bridge deck 1 can be used as a bridge deck pavement layer of a bridge, a top plate stirrup 11, a top plate longitudinal steel bar 12 and a top plate prestressed steel strand 13 are arranged in the cast-in-place bridge deck, the top plate prestressed steel strand 13 is required to be arranged only when the bridge forming system of the bridge is a continuous system, and the existing top plate prestressed steel strand 13 is not arranged if the bridge forming system of the bridge is a simply supported system;

the U-shaped beam 3 consists of a bottom plate 31 at the bottom, two webs 32 and two flange plates 33, a bottom plate stirrup 311, a bottom plate longitudinal steel bar 312 and a bottom plate prestressed steel beam 313 are arranged in the bottom plate 31, the two webs 32 are both provided with the web stirrup 321 and the web longitudinal steel bar 322, and the two flange plates 33 are both provided with the flange plate stirrup 331 and the top plate longitudinal steel bar 12; for the boundary beam, a baffle 34 is arranged on the flange plate 33 at one end close to the outer side of the boundary beam, and for the middle beam, the baffle 34 is not required; a hoisting preformed hole is formed in the web 32;

the two flange plates 33 and the baffle plates 34 of the U-shaped beam 3 can be used as construction templates of the cast-in-place bridge deck 1 and the wet joint 6;

the steel ribs 2 are arranged in two webs 32 of the U-shaped beam 3, holes are formed in the contact positions of the steel ribs 2 and the flange plate stirrups 331 and the web plate stirrups 321, a PBL (Poly-p-phenyleneb) connection mode is adopted, the contact positions of the steel ribs 2 and the bottom plate stirrups 331 are welded, and the steel ribs 2 are fixed in the two modes to form an integral framework;

the diaphragm beams 4 are of a cast-in-place structure, are arranged at supporting points at two sides of the U-shaped beam 3, are provided with a plurality of other supporting points and are uniformly arranged between the two webs 32 along the length direction of the U-shaped beam 3, and comprise inner diaphragm beams 41 arranged inside the small box girder and diaphragm beam tie bars 42 arranged outside the small box girder, the number of the diaphragm beam tie bars 42 is 3, and diaphragm beam tie bar stirrups 421, diaphragm beam tie bar longitudinal steel bars 422 and diaphragm beam tie bar steel ribs 423 are arranged in the diaphragm beam tie bars 42;

the plug plate 5 is of a prefabricated structure, and plug plate steel bars 51 are arranged in the plug plate;

the wet joint 6 is of a cast-in-place structure and is internally provided with wet joint steel bars 61.

Further, the thickness of the bottom plate 31 is 0.15m-0.3m, the thickness of the single-side web plate 32 is 0.1m-0.3m, the thickness of the single flange plate 33 is 0.05m-0.15m, and the bottom plate 31, the web plate 32 and the flange plate 33 are all made of ultra-high performance concrete.

Further, the diaphragm beam tie rod 42 has a rectangular cross section, the length of the cross section is 0.3m to 0.4m, the height of the cross section is 0.2m to 0.3m, the diaphragm plate 4 must be arranged at the supporting points at two sides of the U-shaped beam 3, the rest parts are uniformly arranged along the length direction of the U-shaped beam 3 at intervals of 20m, the thickness of the plug plate 5 is 0.08m to 0.2m, the width of the wet joint 6 is 0.45m to 0.9m, and the materials of the diaphragm beam 4, the plug plate 5 and the wet joint 6 are all ultra-high performance concrete;

further, the thickness of the cast-in-place bridge deck 1 is 0.1m-0.3m, and the material is common concrete;

further, the thickness of the steel rib 2 is 0.02m-0.05m, and the steel rib is made of Q345b steel;

furthermore, the thickness of the steel rib 423 of the transverse diaphragm beam tie rod is 0.02m-0.05m, and the steel rib is made of Q345b steel.

Further, the transverse beam 4 is uniformly arranged at intervals of 20m along the length direction of the U-shaped beam.

In summary, the prefabricated small box girders are connected together through the diaphragm girders 4 and the wet joints 6, so that the integrity of the main girders of the bridge can be improved, and the main girders can participate in stress well.

A part of the prefabricated combined small box girder is used as a template, and the cast-in-place bridge deck slab 1 is used as a bridge deck pavement layer of the bridge, so that the construction steps are simplified, the materials are saved, and the construction cost and the construction period are reduced.

Holes are formed at the contact positions of the steel ribs and the flange plate stirrups 331 and the web plate stirrups 321, a PBL connection mode is adopted, and welding is carried out at the contact positions of the steel ribs 2 and the bottom plate stirrups 331, so that the flange plate stirrups 331, the web plate stirrups 321 and the bottom plate stirrups 331 can be conveniently fixed, and the flange plate longitudinal steel bars 332, the web plate longitudinal steel bars 322 and the bottom plate longitudinal steel bars 312 can be conveniently bound; from the perspective of stress and structure, the slippage between the steel rib and the concrete material is also prevented, so that the steel rib can be more fully involved in bearing.

By adopting the structure, the prefabricated combined small box girder can reduce the structure size, reduce the self weight and the internal force of the structure, improve the spanning capability and the tensile capability of a bridge, and remarkably reduce the cracking probability of the combined box girder and the structural deformation under the load action; compared with a steel structure, the steel structure has higher corrosion resistance, fire resistance and erosion resistance, and the safety and durability of the structure can be improved; both the steel and the UHPC are high-performance materials, and an SUHPC structure formed by combining the steel and the UHPC also has higher bearing capacity; all parts can be prefabricated in a factory and then transported to a site for hoisting, so that the site construction efficiency is greatly improved; because the dead weight of the structure is light, the hoisting operation can be carried out by adopting small hoisting equipment in the urban construction environment where large hoisting equipment cannot be adopted.

The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.

Claims (7)

1. A prefabricated combined small box girder structure is characterized by comprising a cast-in-place bridge deck, a plurality of U-shaped girders and a plurality of diaphragm girders;

the cast-in-situ bridge deck is arranged at the upper end of the U-shaped beam; the U-shaped beam comprises a bottom plate at the bottom, two webs positioned at two ends of the bottom plate and a flange plate positioned at the upper edge of each web, steel ribs are arranged in the webs, two ends of each steel rib respectively extend into the flange plate and the bottom plate, and a baffle is arranged on the flange plate, close to the outer side, of the U-shaped beam positioned at the outermost side of the prefabricated combined small box girder structure;

the transverse partition beam comprises an inner transverse partition beam and a transverse partition beam tie rod, the inner transverse partition beam is supported and arranged on the inner side wall of the U-shaped beam, the transverse partition beam tie rod is connected between two adjacent U-shaped beam webs, wet joints are arranged between flange plates of adjacent U-shaped beams, the adjacent U-shaped beams are connected into a whole through the wet joints and the transverse partition beam tie rod, and plug plates are arranged at two ends of the prefabricated combined small box girder structure.

2. The prefabricated composite small box girder structure of claim 1, wherein a top plate stirrup, a top plate longitudinal reinforcement and a top plate prestressed reinforcement are arranged in the cast-in-place bridge deck slab, a bottom plate stirrup, a bottom plate longitudinal reinforcement and a bottom plate prestressed reinforcement are arranged in the bottom plate, a web plate stirrup and a web plate longitudinal reinforcement are arranged in the web plate, and a flange plate stirrup and a flange plate longitudinal reinforcement are arranged in the flange plate.

3. The prefabricated composite box girder structure according to claim 1, wherein the bottom slab has a thickness of 0.15m to 0.3m, the web slab has a thickness of 0.1m to 0.3m, the flange slabs have a thickness of 0.05m to 0.15m, and the bottom slab, the web slab and the flange slab are made of ultra high performance concrete.

4. The prefabricated composite box girder structure according to claim 1, wherein the diaphragm beam tie bars have a rectangular cross section, a length of 0.3m to 0.4m and a width of 0.2m to 0.3m, the thickness of the bulkhead plate is 0.08m to 0.2m, the width of the wet joint is 0.45m to 0.9m, and the materials of the diaphragm beam tie bars, the bulkhead plate and the wet joint are all ultra-high performance concrete.

5. The prefabricated small box girder structure of claim 1, wherein the tie bars of the transverse partition beams are internally provided with tie bars of the transverse partition beams, longitudinal reinforcements of the tie bars of the transverse partition beams and steel ribs of the tie bars of the transverse partition beams.

6. The prefabricated small box girder structure of claim 5, wherein the thickness of the steel ribs of the tie bars of the beam is 0.02m to 0.05m, and the tie bars are made of Q345b steel.

7. The precast composite small box girder structure according to claim 1, wherein the cast-in-place bridge deck has a thickness of 0.1m to 0.3m and is made of ordinary concrete.

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