CN115584679A - Section steel combined bridge - Google Patents

Abstract

The invention provides a section steel combined bridge, which comprises a plurality of H-shaped steels arranged side by side, wherein the distance between two transversely adjacent H-shaped steels is smaller than the load transverse wheel track of a road vehicle, the end part of each H-shaped steel is provided with an end cross beam, the two ends of each end cross beam are respectively connected with two transversely adjacent H-shaped steels, each end cross beam comprises a steel box, first concrete is poured in each steel box, each steel box comprises a web plate and a bottom plate, each web plate is a corrugated plate, the corrugated extending direction of each web plate is vertically arranged, a stiffening structure is not arranged between two longitudinally adjacent end cross beams of the same H-shaped steel, each H-shaped steel is provided with a bridge deck, each bridge deck comprises a plurality of bridge deck bottom plates, the two sides of each bridge deck bottom plate are connected with two adjacent H-shaped steels, each bridge deck bottom plate is a corrugated plate, the corrugated extending direction of each bridge deck bottom plate is arranged along the longitudinal bridge direction, and second concrete is poured on each bridge deck bottom plate. The girder need not to set up the structure of putting more energy into, effectively reduces the cost.

Description

Section steel combined bridge

Technical Field

The invention relates to the technical field of bridges, in particular to a section steel combined bridge.

Background

The steel consumption index of the steel structure girder designed at home and abroad is approximately distributed in the range of 350 to 600kg per square meter; according to the fact that the comprehensive unit price of the existing steel structure reaches 14000 yuan/ton, the construction cost of the steel structure bridge measured according to the indexes of the steel consumption and the comprehensive unit price exceeds 1 time of the concrete girder with the same span.

The steel structure girder processing steps are as follows: the method comprises the following steps of plate blanking, unit element leveling, unit element positioning and assembling, unit element welding, weld joint detection, formed steel structure leveling, steel structure dimension inspection, steel structure coating, coating detection, steel structure delivery and the like. The steel construction processing flow path is long, and the structure of putting more energy into of steel construction kind and quantity is many in addition, and each structure of putting more energy into all need repeat above-mentioned step once, has leaded to the complete processing flow of steel construction loaded down with trivial details to the required welding workman of steel construction processing, high-grade labour such as coating workman are in large quantities.

Based on the two main factors, the large-scale popularization and application of the steel structure bridge are limited, but the steel structure bridge is taken as the mainstream representative of a green low-carbon bridge, the large-scale popularization and construction of the steel structure bridge is the inevitable trend of future development of traffic infrastructure, and the green development concept is also met. At present, there are many expressways to be built in western mountainous areas, the proportion of bridges and tunnels is very high and exceeds 85%, wherein standard span (mainly 30m and 35 m) bridges account for 90% of the total mileage of all bridges, so that a novel steel structure bridge with low material index, simple processing and manufacturing and controllable comprehensive manufacturing cost is urgently sought.

Disclosure of Invention

The invention aims to: the problem of steel girder engineering cost is too high because the structure of putting more energy into is of a great variety and quantity, and steel construction process is loaded down with trivial details, the human cost is high among the prior art is solved, a shaped steel composite bridge is provided.

In order to achieve the purpose, the invention adopts the technical scheme that:

the utility model provides a shaped steel combination bridge, contains the H shaped steel that a plurality of arranged side by side, H shaped steel is integrated into one piece structure, horizontal adjacent two the interval of H shaped steel is less than the cross bridge of highway vehicle load to the wheel base, the tip of H shaped steel is equipped with the end crossbeam, horizontal adjacent two are connected respectively to end crossbeam both ends H shaped steel, the end crossbeam contains the steel case, first concrete has been pour to the steel incasement, the steel case contains web and bottom plate, the web is the ripples board, the vertical setting is followed to the ripples extending direction of web, and is same vertical adjacent two of H shaped steel do not establish stiffening structure between the end crossbeam, be equipped with the decking on the H shaped steel, the decking contains a plurality of bridge floor bottom plate, the both sides of bridge floor bottom plate are connected in adjacent two H shaped steel, the bridge floor bottom plate is the ripples board, the ripples extending direction of bridge floor bottom plate is to setting along the longitudinal bridge, the second concrete has been pour on the bottom plate.

The load transverse and bridge-direction wheel track of the road vehicle is determined according to the given size of the road design specification.

By adopting the structural steel combined bridge, the distance between two adjacent main beams is reduced, so that the vehicle load is borne by at least two main beams, the stress of the main beams is reduced as much as possible, the webs of the bridge floor bottom plate and the end cross beams are both corrugated steel plates, the waves of the bridge floor bottom plate are placed along the longitudinal bridge direction, the waves of the webs are placed along the vertical direction, and the strong rigidity sides of the corrugated steel plates perpendicular to the wave direction are fully utilized to respectively form a strong combined structure bridge deck and a strong combined structure end cross beam, so that a strong transverse connection effect is achieved, the stress of the main beams is reduced, the stress performance of the bridge deck is improved, and in addition, the integral forming structure of the main beams is adopted, so that the main beams do not need to be provided with additional stiffening ribs on the side surfaces of the main beams or middle partition plates for connecting the two adjacent main beams, a complex processing flow is omitted, the processing time is saved, the quality is controllable, the cost of the steel main beams is effectively reduced, the structural steel main beams are beneficial to market popularization, the main structure is simple, the weight is light, the installation and the bridge is more convenient to install and erect, especially suitable for standard cross-diameter steel structures, and the bridge has a wide application prospect. This structure directly adopts integrated into one piece's shaped steel structure as the girder, simplifies production technology, practices thrift manual work and cost, still through reasonable structural design, has saved girder and decking's stiffening structure, has cancelled cross slab in the multi-disc, has simplified on-the-spot installation step, and this structural system has promoted the efficiency of construction by a wide margin under the prerequisite that factor of safety satisfies the requirement to reduce the carbon emission, realized intelligence and green low carbon and built the target.

Preferably, the bridge deck further comprises a first stiffening member arranged along the transverse bridge direction, and the first stiffening member is connected to the top surfaces of all the bridge deck bottom plates.

Further preferably, the first stiffening member is a steel member, and the first stiffening member is located across the middle.

Further strengthen the transverse connection performance, contact each piece of H shaped steel, play the effect of internal force secondary average distribution for the stress level of each piece of H shaped steel tends to unanimity, can effectively reduce roof, web, the bottom plate stress peak value of H shaped steel, and the security of middle stiffening structure is not established to further the guarantee girder promotes application scope.

Preferably, the bridge deck further comprises a second stiffening member arranged along the longitudinal bridge direction, and the second stiffening member is connected to the top surface of the outermost H-shaped steel.

The second stiffening member is additionally arranged at the position of the boundary beam, and the boundary beam bears the wet load of the bridge deck slab concrete and the second-stage load weight of guardrails and the like, and is more unfavorable than the stress of the middle beam, so that the local compression stability of the H-shaped steel top plate can be enhanced by the mode, and the local buckling of the top plate is prevented from being prior to the overall damage of the structure.

Preferably, the inner side surface of the web plate is connected with a third stiffening member which is vertically arranged, and the third stiffening member is distributed at intervals along the transverse bridge.

Preferably, the bottom plate is provided with a fourth stiffening member arranged along the transverse bridge direction.

And the deformation of the steel box caused by the pouring of the end cross beam is avoided.

The stress performance of the end cross beam is improved, and the safety of the main beam without the middle stiffening structure is further ensured.

Preferably, a fifth reinforcing member is arranged at the beam end of the outer side of the H-shaped steel on the outermost side.

Preferably, the H-shaped steel on the outermost side and the adjacent H-shaped steel are connected with each other to form a box-shaped structure.

Form the steel case structure in the side span position, all the other H shaped steel still satisfy and are less than the restriction of highway vehicle load cross axle to the wheel base, effectively promote the torsional rigidity of girder, improve operation security and hoist and mount stability, do benefit to and promote the span scope that is suitable for, and the steel case structure adopts two H shaped steel forms, compares in current steel case structure, and the processing of being convenient for, and its connection only has longitudinal connection's linear type welding seam, still can adopt the robot welding, is favorable to reducing engineering cost, reduces the steel construction processing degree of difficulty, reduces steel construction process flow.

Further preferably, the second concrete is steel fiber concrete, and the first concrete and the second concrete are integrally cast.

Further preferably, the web plate includes two unit plates welded to the corresponding H-shaped steel, and the two corresponding unit plates are bolted.

The processing in the factory is convenient, and the field welding workload is reduced.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the distance between two adjacent main girders is reduced, so that the vehicle load is borne by at least two main girders, the stress of the main girders is reduced as much as possible, the webs of the bridge floor bottom plate and the end cross girders are made of corrugated steel plates, the waves of the bridge floor bottom plate are placed along the longitudinal bridge direction, the waves of the webs are placed along the vertical direction, and strong rigidity sides of the corrugated steel plates perpendicular to the wave direction are fully utilized to form a strong composite structure bridge deck plate and a strong composite structure end cross girder respectively, so that a strong transverse connection effect is achieved, the stress of the main girders is reduced, the stress performance of the bridge deck plate is improved in a matching manner, the transverse bridge direction force transmission range is wider, the stress distribution of all the main girders is more uniform, the integrally formed steel main girders are matched, additional stiffening structures do not need to be arranged on the main girders, stiffening ribs on the sides of the main girders or middle partition plates for connecting the adjacent main girders, tedious processing procedures are omitted, the processing time is saved, the quality is higher, the cost of the steel main girders is effectively reduced, the market popularization is facilitated, the main structure is simple, the weight is lighter, the installation is more convenient, the bridge is particularly suitable for erecting in a standard diameter cross bridge, and the application prospect of a highway bridge is promising.

Drawings

FIG. 1 is a cross-sectional view of a section steel composite bridge according to example 1;

FIG. 2 is a schematic cross-sectional view of a section of a steel composite bridge according to embodiment 1 at a support;

FIG. 3 isbase:Sub>A schematic cross-sectional view A-A of FIG. 2;

FIG. 4 is a schematic cross-sectional view B-B of FIG. 2;

FIG. 5 is a schematic cross-sectional view of C-C of FIG. 2;

FIG. 6 is a longitudinal sectional view of a section steel composite bridge according to embodiment 1;

FIG. 7 is a schematic top view of a section steel composite bridge according to example 1 (bridge deck is not shown)

Fig. 8 is a schematic top view illustrating a stiffening structure of a deck slab of a profile steel composite bridge according to embodiment 1;

fig. 9 is a connection overview of the first stiffener of embodiment 1;

FIG. 10 is a connection overview of the second stiffeners of example 1;

FIG. 11 is a cross sectional view of a section steel composite bridge according to embodiment 2;

FIG. 12 is a schematic sectional view of a section of the bridge girder assembled from section steel according to embodiment 2;

FIG. 13 is a schematic top view of a stiffening structure of a deck plate of the steel composite bridge according to embodiment 2;

fig. 14 is a connection overview of a first stiffener according to example 2;

fig. 15 is a connection overview of a second stiffener according to example 2;

an icon: 1-H section steel; 2-first concrete; 31-a web; 32-a bottom plate; 41-bridge floor, 42-second concrete; 51-a first stiffener; 52-a second stiffener; 53-a third stiffener; 54-a fourth stiffener; 55-fifth stiffener.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.

Example 1

As shown in fig. 1, 2, 6 and 7, the structural steel composite bridge adopted by the invention comprises a plurality of H-shaped steels 1 arranged side by side, the H-shaped steels 1 are of an integrally formed structure, the distance between two transversely adjacent H-shaped steels 1 is smaller than the transverse wheelbase of the load of a road vehicle, an end beam is arranged at the end part of each H-shaped steel 1, two ends of each end beam are respectively connected with two transversely adjacent H-shaped steels 1, each end beam comprises a steel box, first concrete 2 is poured in each steel box, each steel box comprises a web 31 and a bottom plate 32, each web 31 is a corrugated plate, the corrugated extension direction of each web 31 is vertically arranged, a stiffening structure is not arranged between two longitudinally adjacent end beams of the same H-shaped steel 1, a bridge deck is arranged on each H-shaped steel 1, each bridge deck comprises a plurality of bridge deck bottom plates 41, two sides of each bottom plate 41 are connected to two adjacent H-shaped steels 1, each bottom plate 41 is a corrugated plate, the bottom plate 41 is arranged along the longitudinal direction of the bridge, and second concrete 42 is poured on each bottom plate 41.

Specifically, for example, the span is 30m, the width of a single bridge is 13m, and 3 lanes are set, according to the existing specifications, such as JTG D60-2015, a general highway bridge design specification, and 4.3.1 regulations, the wheel span of the vehicle load transverse bridge is 1.8m, the specific distance is comprehensively determined according to actual conditions, design requirements, cost and the like, if the number of the main beams is determined by the minimum number of the main beams with the distance of the H-shaped steel 1 being less than 1.8m, 8 pieces of H-shaped steel 1 can be adopted and arranged at equal distance of 1.76m, and the parameters of the H-shaped steel 1 are determined according to the design requirements. The end beam is located at the end of the H-beam 1, for example, at the beam end 40-50cm, the web 31 of the end beam comprises two unit plates welded to the corresponding H-beam 1, and the corresponding two unit plates are bolted, as shown in FIG. 2. The bottom plate 32 of the end beam is welded on the top surface of the lower flange plate of the H-shaped steel, and has certain lap joint length. The thickness of the end beam is set according to the actual design requirement, the width of the bottom plate 32 of the end beam is larger than the thickness of the end beam, and stiffening plates can be additionally arranged on the front side and the rear side of the support on the bottom surface of the H-shaped steel at the position of the end beam as shown in figures 4-5. In order to avoid deformation of the steel box during pouring, the inner side face of the web plate 31 can be welded with a third stiffening member 53 which is vertically arranged, and a fourth stiffening member 54 which is arranged along the transverse bridge direction can be welded on the bottom plate 32, the third stiffening member 53 is distributed along the transverse bridge direction at intervals, the third stiffening member 53 can be a steel bar member, and the fourth stiffening member 54 can be a steel plate member, as shown in fig. 3-5. For the convenience of connection and the guarantee of connection performance, the web 31 and the deck bottom 41 both use a wave folding plate having a planar shape like a trapezoidal wave, so as to have a sufficient connection surface with the H-shaped steel or the third stiffener 53. The fifth stiffening member 55 is arranged at the beam end of the outer side of the H-shaped steel 1 at the outermost side, common stiffening rib plates in the prior art can be adopted, and the specific number and size are set according to actual needs.

In order to ensure the connection performance of the main beam and the bridge deck, the top surface of the H-shaped steel 1 serving as the main beam adopts a shear nail structure commonly used in the prior art to ensure the connection with the second concrete 42, and side plates are arranged on the side surfaces of the shear nail structure and used for sealing the side surfaces of the bridge deck bottom plate 41. The bridge floor bottom plate 41 is disconnected at the beam end, so that the first concrete 2 and the second concrete 42 are integrally poured, the bridge floor bottom plate 41 is provided with a steel bar net piece which is bound well, and the steel fiber concrete is poured to form the high-toughness combined bridge deck.

As shown in fig. 8-10, besides the steel bar structure itself, a first stiffening member 51 disposed along the transverse direction and a second stiffening member 52 disposed along the longitudinal direction are embedded in the deck slab, the first stiffening member 51 is connected to the top surfaces of all the deck bottom plates 41, if an angle steel member is used, and is located in the middle of the bridge deck, the specific number, size, spacing, section form, and the like are determined according to actual needs, the transverse connection performance is effectively enhanced, and the stress level of each H-shaped steel 1 tends to be consistent, so that the stress peak values of the top plate, web plate, and bottom plate of the H-shaped steel 1 can be effectively reduced, the safety of the girder without the intermediate stiffening structure is further ensured, and the application range of the structure is improved; the second stiffening member 52 is connected in the H shaped steel 1 top surface of outermost side, and the optional reinforcing bar component of second stiffening member 52 strengthens boundary beam roof part compression stability, prevents that the roof part buckling under compression is earlier than the structure whole destruction. Although the bridge deck is provided with the stiffening structure, the stiffening structure is not processed by a steel structure, but is equivalent to a steel bar welding process, if fillet welds arranged on a single surface are adopted, the welds are distributed at intervals, so that special steel structure processing personnel and a complex steel structure processing flow are not needed, the field construction flow is effectively simplified, and the stress performance of the bridge deck can be ensured.

This structure directly adopts integrated into one piece's shaped steel structure as the girder, simplifies production technology, practices thrift manual work and cost, still through reasonable structure design, has saved girder and decking's stiffening structure, has cancelled cross slab in the multi-disc, has simplified on-the-spot installation step, and this structural system has promoted the efficiency of construction by a wide margin under the prerequisite that factor of safety satisfies the requirement to reduced the carbon emission and can reach 45%, realized intelligence and green low carbon construction target.

Example 2

As shown in fig. 11 to 12, on the basis of embodiment 1, if the same girder height is adopted but the bridge span is further increased, the outermost H-section steel 1 and the adjacent H-section steel 1 are connected with each other to form a box-type structure, that is, a steel box structure is formed at the side span position, and the rest H-section steel still satisfies the limitation smaller than the wheel span of the road vehicle load transverse bridge, and if the single width of the bridge according to embodiment 1 is not changed, when the span adopts 35m, 10H-section steel 1 pieces can be designed, the flange plates corresponding to two H-section steel 1 at the side beam position are welded with each other to form a box shape, and the distance between the rest H-section steel 1 pieces is arranged according to 1.5657 m. The longitudinal and transverse bending rigidity and torsional rigidity of the structure can be increased by forming the steel box girder, the operation safety and the hoisting stability are improved, the welding process of the two H-shaped steel 1 is compared with the existing steel box structure, a steel structure machining flow is not required to be adopted, the processing is convenient, the engineering cost is favorably reduced, the steel structure machining difficulty is reduced, and the steel structure machining flow is reduced.

The first stiffener 51 in the deck slab may be an i-beam member and still be in a mid-span position and the second stiffener 52 still be outside the top surface of the outermost H-section 1 as shown in figures 13-15.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a shaped steel combination bridge, its characterized in that contains H shaped steel (1) that a plurality of arranged side by side, H shaped steel (1) is integrated into one piece structure, horizontal adjacent two the interval of H shaped steel (1) is less than highway vehicle load cross bridge to wheel base, the tip of H shaped steel (1) is equipped with the end crossbeam, horizontal adjacent two is connected respectively to end crossbeam both ends H shaped steel (1), the end crossbeam contains the steel case, first concrete (2) have been pour to the steel incasement, the steel case contains web (31) and bottom plate (32), web (31) are the corrugated board, the corrugated board extending direction of web (31) is along vertical setting, and is same the bridge floor (41) vertically adjacent two do not establish stiffening structure between the end crossbeam, be equipped with the decking on H shaped steel (1), the decking contains a plurality of bottom plate (41), the both sides of bottom plate (41) are connected in adjacent two bridge floor (1), bottom plate (41) are the corrugated board, the corrugated board extending direction of bridge floor (41) sets up along second concrete bridge (42) to pour on the bridge floor.

2. A profile steel composite bridge according to claim 1, wherein said deck slab further comprises first stiffening members (51) arranged in the transverse direction, said first stiffening members (51) being connected to the top surface of all said deck floors (41).

3. A profile steel composite bridge according to claim 2, wherein said first stiffener (51) is a profile steel member, said first stiffener (51) being located mid-span.

4. The profile steel composite bridge according to claim 1, wherein the bridge deck further comprises a second stiffening member (52) arranged along the longitudinal bridge direction, and the second stiffening member (52) is connected to the top surface of the outermost H-shaped steel (1).

5. A profiled bar composite bridge girder according to claim 1, characterized in that the inner side of the web (31) is connected with a vertically arranged third stiffening member (53), and the third stiffening members (53) are distributed at intervals along the transverse bridge direction.

6. A profile steel composite bridge according to claim 1, characterised in that the bottom plate (32) is provided with fourth stiffeners (54) arranged in the cross bridge direction.

7. A profile steel composite bridge according to claim 1, characterized in that the outer side of the outermost H-shaped steel (1) is provided with a fifth reinforcing member (55) at the beam end.

8. A section steel composite bridge according to any one of claims 1 to 7, characterized in that the outermost H-shaped steel (1) and the adjacent H-shaped steel (1) are connected with each other to form a box-shaped structure.

9. A profile steel composite bridge according to claim 8, wherein said second concrete (42) is steel fiber concrete, and said first concrete (2) and said second concrete (42) are integrally cast.

10. A section steel composite bridge according to claim 8, characterized in that the web (31) comprises two unit plates welded to the corresponding H-shaped steel (1), and the corresponding two unit plates are bolted.

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