CN117488648A

CN117488648A - Truss girder-arch combined bridge structure and bridge construction method

Info

Publication number: CN117488648A
Application number: CN202311651841.4A
Authority: CN
Inventors: 孙全利; 谢桂兰; 管广博; 孙秀银; 黄竞锋; 张淑贤; 谭静文
Original assignee: Guangzhou Urban Planning Survey And Design Research Institute Co ltd
Current assignee: Guangzhou Urban Planning Survey And Design Research Institute Co ltd
Priority date: 2023-12-05
Filing date: 2023-12-05
Publication date: 2024-02-02

Abstract

The invention relates to the field of bridge construction, and discloses a truss girder-arch combined bridge structure and a bridge construction method, wherein the truss girder-arch combined bridge structure comprises a main truss, a main arch ring and a suspender; the arch feet at two ends of the main arch ring are fixedly connected with the main truss, and two ends of the suspender are respectively and movably connected with the main arch ring and the main truss; the main truss comprises a plurality of chords, wherein an inclined web member and a vertical web member are arranged between two upper and lower adjacent chords, and a cross beam is arranged between two left and right corresponding chords; the beam is provided with a bearing plate, and the bearing plate and the beam form a bridge deck system to jointly bear the bridge deck load; the arch springing of the main arch ring is directly fixed on the main truss, so that the horizontal thrust of the main arch ring directly acts on the main truss, the whole bridge is changed into a stretch-bending structure from the bent structure of the main truss, the bearing capacity of the bridge is improved, the span of the bridge can be larger, and more vehicles can be borne.

Description

Truss girder-arch combined bridge structure and bridge construction method

Technical Field

The invention relates to the field of bridges, in particular to a truss girder-arch combined bridge structure and a bridge construction method.

Background

Truss girders are a structure widely used in bridges and buildings, and consist of a number of web members. The truss girder is introduced by taking excellent bending resistance and strong deformation coordination capacity as a large-scale supporting structure, and the truss girder is very widely applied in engineering because of simple design, manufacture and installation, wherein the truss girder bridge is generally formed into a space structure by two main trusses, a longitudinal connecting system and a transverse connecting system, but because the span positive bending moment of the truss bridge is in direct proportion to the span, the span is larger, the span positive bending moment of the bridge is also larger, the truss also needs larger structural height to improve the stability and bearing capacity of the truss bridge, and the height of a structural building above the bridge is limited, so that the span of the bridge is reduced, namely the span of the truss bridge belonging to a bent structure is poorer;

the arch bridge is an old bridge type and is also a bridge type frequently used in modern bridge construction, the two end supporting positions of the arch bridge generate horizontal thrust under the action of vertical load, the horizontal thrust is the axial pressure in the arch, the midspan bending moment is greatly reduced, the main arch section material strength of the arch bridge is fully exerted, and the spanning capacity is increased, so that the arch bridge is more applied in bridge engineering construction, particularly in landscape bridge, but the erection of the arch bridge has higher requirements on geological conditions due to the horizontal thrust, and the arch bridge is not suitable for being constructed in geology bad areas.

Disclosure of Invention

The invention aims to solve the technical problems that: how to combine the truss girder bridge and the arch bridge to improve the bearing capacity of the bridge under the condition of ensuring the bridge crossing capacity.

In order to solve the technical problems, the invention provides a truss girder-arch combined bridge structure, which comprises truss units, wherein each truss unit comprises a main truss and two main arch rings erected above the main truss;

the main truss comprises two chord members symmetrically distributed along the width direction, the chord members comprise at least two chord members which are sequentially arranged at intervals from top to bottom, and the chord members extend along the length direction; a bridge deck system is respectively arranged between two corresponding chord rods along the width direction, the bridge deck system comprises a supporting plate and a plurality of cross beams, the cross beams are sequentially arranged at intervals along the length direction, two ends of each cross beam are respectively connected with one chord rod, and the supporting plate is arranged above the cross beams; a plurality of vertical web members extending in the vertical direction are connected between two adjacent chords in the vertical direction at intervals along the length direction, and an inclined web member which is obliquely arranged relative to the vertical direction is arranged between the two adjacent vertical web members along the length direction;

two main arches are arranged above each chord member group in a one-to-one correspondence mode, two ends of each main arch are fixedly connected to two ends of each chord member positioned at the uppermost position of each chord member group respectively, a plurality of hanging rods are connected between each main arch and each chord member connected with each main arch, the hanging rods are sequentially arranged at intervals along the length direction, the upper ends of the hanging rods are hinged with the main arches, and the lower ends of the hanging rods are hinged to the chord members.

Preferably, each chord group comprises three chords, correspondingly three deck systems are provided.

Preferably, the included angle between the main arch ring and the bridge deck system is in the range of 60-120 degrees.

Preferably, the side of the support plate facing the cross beam has a plurality of pressing grooves arranged at intervals in the width direction.

Preferably, a plurality of truss units are provided, and the truss units are sequentially provided in the longitudinal direction.

Preferably, the main trusses of two adjacent truss units are welded to each other.

Preferably, the bridge deck systems of two adjacent truss units are connected through bridge deck continuous steel bars, and an expansion joint is reserved between two adjacent main trusses.

Preferably, each component of the main truss and the main arch ring are steel pieces, and each component of the main truss and each main truss and the main arch ring are connected by welding.

Preferably, each component of the main truss and the main arch ring are of reinforced concrete structures or prestressed reinforced concrete structures, and concrete is poured between each component of the main truss and between the main truss and the main arch ring after the reinforced bars are connected.

The invention also provides a bridge construction method based on the truss girder-arch combination bridge structure, which comprises the following steps:

s1, constructing pile foundations, bearing platforms and pier blocks, and forming each sectional structure of a main truss and a main arch ring respectively;

s2, building temporary buttresses, hoisting each segmented structure of the main truss to a pier and the temporary buttresses respectively, and connecting each segmented structure of the main truss into an integral structure;

s3, setting temporary struts on the main truss, hoisting each segmented structure of the main arch ring to the temporary struts, connecting each segmented structure of the main arch ring into an integral structure, and connecting and fixing arch legs at two ends of the main arch ring with the main truss;

and S4, installing a suspender between the main arch ring and the main truss, and removing the temporary buttress and the temporary support.

Compared with the prior art, the truss girder-arch combined bridge structure and the bridge construction method provided by the embodiment of the invention have the beneficial effects that:

in this embodiment, part of the load that the bridge deck receives is transmitted to the main arch ring via the hanger rod, so that the main arch ring generates horizontal thrust, and two ends of the main arch ring are directly fixed on the chords at the uppermost part of the main truss, the horizontal thrust generated by the main arch ring directly acts on two ends of the chords at the uppermost part of the main truss instead of other web members and other structures, so that the tensile force in the length direction is applied to the chords, the tensile capacities of the sections of the chords and the sections of the main arch ring are fully utilized while the load that the bridge deck receives is reduced, the bearing capacity of the bridge is improved, and the span of the bridge can be larger and can bear more vehicles.

Drawings

FIG. 1 is a front view of the present invention;

FIG. 2 is a side view of the present invention;

FIG. 3 is a construction flow chart of the present invention;

fig. 4 is a schematic view of the construction structure of step S1 in the construction flow of the present invention.

Fig. 5 is a schematic view of the construction structure of step S2 in the construction flow of the present invention.

Fig. 6 is a schematic view of the construction structure of step S3 in the construction flow of the present invention.

Fig. 7 is a schematic view of the construction structure of step S4 in the construction flow of the present invention.

In the figure: 1. a main truss; 11. an upper chord; 12. a middle chord; 13. a lower chord; 14. a cross beam; 15. a diagonal web member; 16. vertical web members; 17. a support plate;

2. a main arch ring;

3. a boom; 4. a pier; 5. temporary buttresses; 6. temporary support posts.

Detailed Description

The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.

As shown in fig. 1 and 2, a preferred embodiment of the present invention provides a truss girder-arch combined bridge structure and a bridge construction method, including a truss unit including a main truss 1 and two main arches 2 erected above the main truss 1;

the main truss 1 comprises two chord members symmetrically distributed along the width direction, wherein the chord members comprise at least two chord members which are sequentially arranged at intervals from top to bottom, and the chord members extend along the length direction; a bridge deck system is respectively arranged between two corresponding chord rods along the width direction, the bridge deck system comprises a supporting plate 17 and a plurality of cross beams 14, the cross beams 14 are sequentially arranged at intervals along the length direction, two ends of each cross beam 14 are respectively connected with one chord rod, and the supporting plate 17 is arranged above the cross beams 14; a plurality of vertical web members 16 extending in the vertical direction are connected between two adjacent string members in the vertical direction at intervals along the length direction, and an inclined web member 15 which is obliquely arranged relative to the vertical direction is arranged between two adjacent vertical web members 16 along the length direction;

two main arches 2 are arranged above each chord member group in a one-to-one correspondence manner, two ends of each main arch ring 2 are respectively and fixedly connected with two ends of the chord member positioned at the uppermost of each chord member group, a plurality of suspenders 3 are connected between each main arch ring 2 and the chord member connected with each main arch ring, the suspenders 3 are sequentially arranged at intervals along the length direction, the upper ends of the suspenders 3 are hinged with the main arch rings 2, and the lower ends of the suspenders 3 are hinged with the chord members.

Specifically, in the existing bridge structure combining the arch and the truss, the arch legs at two ends of the arch ring are mostly penetrated through the truss and directly fixed on the ground through concrete blocks, the side surfaces at two ends of the main arch ring 2 are connected with the main truss 1, the thrust generated by the main arch ring 2 under the structure is still borne by the ground or the abutment 4, the horizontal thrust is not applied to the main truss 1 to fully utilize the tensile capacity of the main truss 1 structure, the geological requirements are still higher, the use environment is still limited, the arch legs at two ends of the main arch ring 2 are fixedly connected with the main truss 1, when the bridge deck bears downward load, the load is transmitted to the main arch ring 2 through the suspender 3, the main arch ring 2 bears downward force, and the main arch ring 2 converts the part of the force to the horizontal thrust and applies to the chord bar at the top of the main truss 1, namely, the downward force of the chord bar is converted to the transverse tension capacity directly acting on the chord bar through the main arch ring 2 part, the tensile capacity of the main arch ring 1 is also improved, the cross section of the bridge deck is also improved, the bridge deck is also fully stressed by the bridge deck, and the cross section of the bridge deck is greatly improved, and the load bearing capacity of the bridge deck is also improved, and the bridge deck is greatly stressed by the bridge deck is also is 1; in addition, through setting up a plurality of bearing plates 17 and crossbeam 14 to the truss inside layering so as to set up a plurality of bridge deck systems from top to bottom along the direction of height for the vehicle pedestrian layering is passed, and the bearing capacity of each bridge deck system has been fully utilized, has improved the traffic efficiency of bridge.

In some embodiments, each chord group comprises three chords, correspondingly, three deck systems are provided, a specific chord group comprising, from top to bottom, an upper chord 11, a middle chord 12 and a lower chord 13; the bridge deck system corresponds to the upper chord 11, the middle chord 12 and the lower chord 13 and comprises an upper bridge deck system, a middle bridge deck system and a lower bridge deck system, in the actual running process, different vehicles can be distributed to pass through the different bridge deck systems according to the weight of the vehicles and the stress condition of the upper bridge deck system on the main truss 1, meanwhile, a partition plate is arranged in the middle to separate a left lane and a right lane so as to fully utilize the bearing capacity of the lifted main truss 1, further, the upper bridge deck system is subjected to the tensile force of the main arch ring 2 and the hanger rod 3 and the supporting force of the plurality of vertical web members 16 and the inclined web members 15, the bearing capacity of the upper bridge deck system is higher, the upper bridge deck system is used for passing through heavy trucks, buses and the like, the middle bridge deck system is used for passing through small buses, the lower bridge deck system is mainly subjected to the supporting force of two ends and the downward force exerted by the upper bridge deck system and the middle bridge deck system is weaker than the upper bridge deck system, and the lower bridge deck system can be used for non-motor vehicles and pedestrians; in other embodiments, the left and right lanes may be separated into an upper deck system and a middle deck system, while the lower deck system is used for pedestrian and non-motor traffic.

In some embodiments, the lower end of the boom 3 is hinged to the vertical web member 16, the middle part of the middle deck system and the middle part of the lower deck system are influenced by dead weight and load, downward force is exerted, the vertical web member 16 is connected with the upper deck system, the middle deck system and the lower deck system, the downward load exerted by the middle deck system and the lower deck system is transferred to the boom 3 through the vertical web member 16 and is converted into transverse thrust through the main arch ring 2 to be exerted on the upper chord member 11, and the hinged arrangement of the boom 3 and the vertical web member 16 enables the forces exerted by the middle deck system and the lower deck system to be well transferred to the main arch ring 2 through the boom 3.

In some embodiments, the primary arch ring 2 is at an angle in the range of 60 ° to 120 ° to the deck system. The inclination angles of the main arch rings 2 are different, the shapes of the main arch rings are also different, and the integral attractive effect of the bridge can be improved.

In some embodiments, the side of the support plate 17 facing the cross beam 14 has a plurality of slots spaced apart in the width direction. On the one hand, the steel materials are fewer, the production cost is lower, and on the other hand, compared with a plane plate, the wave-shaped structural design is better in bearing capacity, so that the load requirement can be met, and concrete and asphalt can be matched to further strengthen the bearing capacity when the bridge deck system is actually constructed.

In some embodiments, a plurality of truss elements are provided, the plurality of truss elements being disposed in sequence along the length. When the distance to be spanned is too long, a bridge can be formed by arranging a plurality of fulcrums and a plurality of truss units, adjacent main trusses 1 can be mutually noninterfered, the adjacent main trusses are respectively erected on the fulcrums to form a multi-span simply supported girder bridge, bridge decks of two adjacent truss units are connected through bridge deck continuous steel bars, expansion joints are reserved between the two adjacent main trusses 1, the construction of the multi-span simply supported girder bridge is simpler, and the production cost is lower; in other embodiments, a plurality of main trusses 1 can be welded and fixed together in sequence to form a continuous girder bridge, and the bearing capacity of the continuous girder bridge is better than that of a multi-span simply supported girder.

In some embodiments, each component in the main truss 1 and the main arch ring 2 is a steel piece, and each component of the main truss 1 and each component of the main arch ring 2 are connected by welding; the whole dead weight of bridge is lighter for the full steel construction, and the construction of bridge is also easier, and in some other embodiments, each component in main truss 1 and the main arch 2 is reinforced concrete structure or prestressing force reinforced concrete structure, pour concrete fixed connection after the reinforcing bar is connected between each component of main truss 1 and between main truss 1 and the main arch 2, each component in main truss 1 and the main arch 2 pours the shaping in advance, then hoist and mount each component and pass through reinforcing bar connection and fix through pouring concrete between each component, the bending resistance of concrete is relatively poor and tensile ability is better, the main arch 2 converts the partial load that main truss 1 received into transverse pulling force, then the cross section material intensity of concrete can be fully utilized, and the cost of reinforced concrete bridge is also lower.

As shown in fig. 3 to 7, the present invention also provides a construction method of a truss girder-arch combined bridge structure, comprising the steps of:

s1, constructing pile foundations, bearing platforms and pier 4, and forming each sectional structure of a main truss 1 and a main arch ring 2 respectively; in the actual construction process, the length of the main truss 1 often exceeds hundred meters, before construction, the main truss 1 and the main arch ring 2 are required to be divided into different sectional structures according to the drawing, and in a factory, the different sectional structures are welded and formed or poured and formed for subsequent hoisting work.

Step S2, setting up temporary buttresses 5, hoisting each segmented structure of the main truss 1 onto a pier 4 and the temporary buttresses 5 respectively, and connecting each segmented structure of the main truss 1 into an integral structure; arranging a plurality of temporary buttresses 5 between two piers 4 according to the positions of each sectional structure and the total length of the main truss 1, hoisting each sectional structure of the main truss 1 to the temporary buttresses 5 for fixation, and then sequentially welding and fixing each sectional structure of the main truss 1 or connecting each sectional structure by steel bars and then pouring concrete for connection and fixation to form a complete main truss 1 structure; wherein the upper end of the temporary abutment 5 is connected to a vertical web member 16.

Step S3, setting temporary support posts 6 on the main truss 1, hoisting each sectional structure of the main arch ring 2 to the temporary support posts 6, connecting each sectional structure of the main arch ring 2 into an integral structure, and connecting and fixing arch feet at two ends of the main arch ring 2 with the main truss 1; the temporary support columns 6 for supporting the main arch ring 2 are arranged at the positions, corresponding to the temporary buttresses 5, of the upper part of the main truss 1, so that the stress condition of the main truss 1 is better in the installation process of the main arch ring 2, the gravity of the main arch ring 2 is transmitted to the temporary buttresses 5 through the temporary support columns 6 and the vertical web members 16, and the gravity of the main arch ring 2 cannot be borne by the upper chord members 11 or the lower chord members 13 of the main truss 1, so that the safety of the structure of the main truss 1 in the installation process is protected; after each sectional structure of the main arch ring 2 is welded or poured and fixed into a complete main arch ring 2 structure, the arch springs of the main arch ring 2 and the upper chord 11 of the main truss 1 are welded or poured and fixed together.

S4, installing a suspender 3 between the main arch ring 2 and the main truss 1, and dismantling the temporary buttress 5 and the temporary strut 6; the temporary support columns 6 are required to be removed at intervals to give up space for the installation of the suspender 3 when the suspender 3 is installed, meanwhile, before the suspender 3 is completely installed, the temporary support columns 6 need to be reserved to stably support the main arch ring 2, when the suspender 3 is completely installed, the whole stress is formed between the main truss 1 and the main arch ring 2, all the temporary support columns 6 can be removed, and then the temporary buttress 5 is removed.

After the temporary piers 5 and temporary struts 6 are completely removed, a deck system paving work and an auxiliary work can be performed, and the support plates 17 are laid on the cross members 14, and concrete and asphalt are poured to form a deck.

The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.

Claims

1. The truss girder-arch combined bridge structure is characterized by comprising truss units, wherein each truss unit comprises a main truss and two main arches erected above the main truss;

2. The truss girder-arch combined bridge structure according to claim 1, wherein each chord group comprises three chords, and correspondingly, three deck systems are provided.

3. The truss girder-arch combination bridge structure of claim 1, wherein an included angle between the main arch ring and the deck system ranges from 60 ° to 120 °.

4. The truss girder-arch combined bridge construction according to claim 1, wherein the side of the support plate facing the cross beam has a plurality of pressing grooves arranged at intervals in the width direction.

5. The truss girder-arch combined bridge structure according to claim 1, wherein a plurality of the truss units are provided, the plurality of truss units being sequentially provided in a length direction.

6. The truss girder-arch combined bridge construction of claim 5, wherein main trusses of two adjacent truss units are welded to each other.

7. The truss girder-arch combined bridge structure according to claim 5, wherein bridge deck systems of two adjacent truss units are connected by bridge deck continuous steel bars, and an expansion joint is left between two adjacent main trusses.

8. The truss girder-arch combined bridge structure of claim 1, wherein each member of the main truss and the main arch are steel members, and each member of the main truss and each main truss and the main arch are connected by welding.

9. The truss girder-arch combined bridge structure according to claim 1, wherein each member of the main truss and the main arch are of reinforced concrete structure or prestressed reinforced concrete structure, and concrete is poured between each member of the main truss and between the main truss and the main arch after the reinforced bars are connected.

10. The bridge construction method of the truss girder-arch combination is characterized by comprising the following steps of:

s3, setting temporary struts on the main truss, hoisting each segmented structure of the main arch ring to the temporary struts, connecting each segmented structure of the main arch ring into an integral structure, and fixedly connecting two ends of the main arch ring with the main truss;