A truss bridge with spatial torsion shape and construction method thereof

Abstract

The present invention discloses a truss bridge with a spatial twisting form and a construction method thereof. The main truss chord structure of a traditional truss bridge which is parallel to each other and extends in a straight line is designed into a mutually staggered curved chord structure with a spatial twisting form, comprising a main truss structure, a plurality of portal frames evenly distributed on the main truss structure along the bridge direction, a bridge deck, piers supporting the entire bridge truss structure, and supports arranged between the piers and the truss structure; the main truss structure comprises a left upper chord, a right upper chord, a left lower chord and a right lower chord, and the portal frame is formed by a crossbeam, a web member, an upper horizontal longitudinal link and a lower horizontal longitudinal link closed along the transverse direction of the bridge; by merging the right lower chord and the right lower chord into a chord, dividing the left lower chord into two, twisting the separated chord into a left upper chord, and twisting the original left upper chord into a right upper chord, there is no need to add excessive building decoration materials, the force requirements of the bridge structure itself are combined with the requirements of architectural modeling, it is more economical and reasonable than conventional methods, and the spanning capacity is greater.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and relates to a truss bridge with a spatial torsion shape and a construction method thereof. Background Art

[0002] For truss bridges, the truss structure is divided into the upper and lower chords of the main truss, web members, crossbeams, horizontal and longitudinal joints, etc. Its main load-bearing components are the upper and lower chords of the main truss composed of parallel and straight-extending steel pipes and steel components, or the left and right chords are respectively on the same plane. The main problem of conventional truss bridges is that the bridge architectural shape has a strong industrial atmosphere and is difficult to match with the urban landscape. It is generally not used in the core area of ​​the city. In order to improve the architectural shape of conventional truss bridges, the current conventional treatment methods have the following problems:

[0003] (1) In order to improve the architectural shape, urban bridges sometimes need to design the trusses into a spatial torsion shape according to the requirements of architectural design. The conventional practice is to design the trusses as decorative components, the load-bearing components as independent main beams, and the decorative components into a spatial torsion shape. In this way, the load-bearing structural main beams and the decorative system are separated. There are many problems, such as: the structure is subjected to large forces, the spanning capacity of the main beam is limited, the cost is not economical, and the construction is cumbersome.

[0004] (2) On the other hand, when urban bridges have higher requirements for stiffness (such as pedestrian overpasses), conventional truss bridges often need to increase stiffness by increasing the truss height, which not only increases the construction cost but also makes it difficult to meet the requirements of architectural landscape. Summary of the invention

[0005] In view of this, in order to solve the problems of cumbersome construction, high cost and difficulty in meeting architectural landscape requirements when conventional truss bridges are used to improve architectural shape and increase rigidity, the present invention provides a truss bridge with a spatial torsion shape and a construction method thereof, aiming to improve the architectural shape of traditional truss bridges and increase the structural rigidity of traditional truss bridges.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A truss bridge with a spatial torsion shape, in which the parallel and straight-extending main truss chord structure of a traditional truss bridge is designed into a staggered curved chord structure, and has a spatial torsion shape, including a main truss structure, a plurality of portal frames evenly distributed on the main truss structure along the bridge direction, a bridge deck, piers supporting the entire bridge truss structure, and supports arranged between the piers and the truss structure; the main truss structure includes a left upper chord, a right upper chord, a left lower chord and a right lower chord, the portal frame is formed by a crossbeam, a web member, an upper horizontal longitudinal link and a lower horizontal longitudinal link being closed along the transverse bridge direction, and the bridge deck is located on the lower horizontal longitudinal link and the crossbeam; the portal frame connects the left upper chord, the right upper chord, the left lower chord and the right lower chord into a whole;

[0008] The points where the left upper chord and the right upper chord start to extend in a curve along the bridge direction are support axis A and support axis B; the right upper chord located at support axis A extends in a curve toward the position of the right lower chord in the direction of support axis B, and merges with the right lower chord to form a chord near support axis B; the left upper chord located at support axis A extends in a curve toward the right upper chord in the direction of support axis B, and becomes the right upper chord near support axis B; the left lower chord located at support axis A is divided into two, and the separated chord extends toward support axis B, and becomes the left upper chord at support axis B.

[0009] The beneficial effects of this basic scheme are as follows: by merging the right lower chord and the right lower chord into one chord, dividing the left lower chord into two, twisting the separated chord into a left upper chord, and twisting the original left upper chord into a right upper chord, the required spatial twisting architectural shape is designed without adding too much architectural decoration materials. The force requirements of the bridge structure itself are combined with the architectural shape requirements. It is more economical and reasonable than conventional methods, has a greater spanning capacity, and solves the problem of incompatibility between truss bridges and urban landscapes.

[0010] Furthermore, four groups of supports are symmetrically arranged, including two groups of end supports located at the end points of the truss structure and another two groups of supports I and II located at support axis A and support axis B; the left lower chord and the right lower chord are placed in parallel and extend in a straight line along the direction of the bridge, the left upper chord and the right upper chord are respectively parallel to the left lower chord and the right lower chord on the end supports and extend in a straight line along the direction of the bridge to the positions of support axis A and support axis B, and the left upper chord and the right upper chord extend along the direction of the bridge along a spatial curve between support I and support II, respectively.

[0011] Furthermore, the left upper chord, the right upper chord, the left lower chord, the right lower chord, the support shaft A, and the support shaft B can also be reversely twisted.

[0012] Furthermore, when the spatial positions of the left upper chord, the right upper chord, the left lower chord and the right lower chord change, the crossbeams, web members, upper horizontal longitudinal links and lower horizontal longitudinal links are still required to be evenly distributed in the transverse direction to form a closed portal frame, connecting the left upper chord, the right upper chord, the left lower chord and the right lower chord into a whole.

[0013] Furthermore, the main truss structure, the portal frame and the main truss structure are connected to form a whole that all adopts a circular steel pipe cross-section.

[0014] Furthermore, tie rods are obliquely connected between the left upper chord, the right upper chord, the left lower chord, the right lower chord, the crossbeam, the web member, the upper horizontal longitudinal joint and the lower horizontal longitudinal joint.

[0015] A method for constructing a truss bridge with a spatial torsion shape comprises the following steps:

[0016] S1: Construction of the substructure piers of the bridge and the bearings on the piers used to support the entire bridge truss structure;

[0017] S2: Two standard sections and one variable section are prefabricated in the factory; the section between the end support and support I and support II is the standard section, and the section between support I and support II is the variable section;

[0018] S3: Weld the two ends of the variable section and the two standard sections to form a whole, and then transport it to the bridge site;

[0019] S4: Temporary piers are set at the connection positions of each segment, and each segment unit is hoisted onto the temporary piers and then welded into a whole;

[0020] S5: Construction of bridge deck and other ancillary facilities.

[0021] The beneficial effects of the present invention are:

[0022] 1. The truss bridge with a spatial torsion shape disclosed in the present invention has a truss structure itself designed into a required spatial torsion architectural shape, without adding too much architectural decoration materials. The force requirements of the bridge structure itself are combined with the architectural shape requirements, which is more economical and reasonable than conventional practices and has a greater spanning capacity.

[0023] 2. The truss bridge with a spatial torsion shape disclosed in the present invention has a main truss chord structure designed as a mutually staggered curved chord structure, which solves the problem of the incompatibility between the truss bridge and the urban landscape.

[0024] 3. The truss bridge with spatial torsion disclosed in the present invention has a greater structural stiffness than a conventional truss bridge with the same truss height and cross-section due to the addition of a chord structure in the torsion section. The structural eigenvalue analysis results show that the natural frequency of the structure is higher under each mode; the structural deformation calculation shows that the displacement control is better. It is suitable for bridge span structures such as pedestrian bridges that require the control of the natural frequency and stiffness of the structure.

[0025] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0027] Figure 1 It is a front view of a truss bridge with a spatial twisting shape according to the present invention;

[0028] Figure 2 It is a three-dimensional schematic diagram of the upper side of the truss bridge with a spatial torsion shape of the present invention;

[0029] Figure 3 It is a three-dimensional side view of a truss bridge with a spatial twisting shape according to the present invention;

[0030] Figure 4 (a) is a schematic cross-sectional view of a standard section of a truss bridge with a spatial torsion shape according to the present invention;

[0031] Figure 4 (b) is a schematic cross-sectional view of a changing section of a truss bridge with a spatial torsion shape according to the present invention;

[0032] Figure 5 It is a schematic diagram of the structural calculation model of the truss bridge with a spatial torsion shape according to the present invention.

[0033] Attached icons: left upper chord 1, right upper chord 2, left lower chord 3, right lower chord 4, cross beam 5, web member 6, upper horizontal longitudinal joint 7, lower horizontal longitudinal joint 8, tie rod 9, bridge deck 10, pier 11, support 12. DETAILED DESCRIPTION

[0034] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0035] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and descriptions in the drawings may be omitted.

[0036] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0037] See also Figures 1 to 4 A truss bridge with a spatial torsion shape is shown. A truss bridge with a spatial torsion shape designs the main truss chord structure of a traditional truss bridge that is parallel to each other and extends in a straight line into a staggered curved chord structure with a spatial torsion shape, including a main truss structure, a plurality of portal frames evenly distributed on the main truss structure along the bridge direction, a bridge deck 10, piers 11 supporting the entire bridge truss structure, and supports 12 arranged between the piers 11 and the truss structure; the main truss structure includes a left upper chord 1, a right upper chord 2, a left lower chord 3 and a right lower chord 4, the portal frame is formed by a crossbeam 5, a web member 6, an upper horizontal longitudinal link 7, and a lower horizontal longitudinal link 8 that are closed along the transverse direction of the bridge, and the bridge deck 10 is located on the lower horizontal longitudinal link 8 and the crossbeam 5; the portal frame connects the left upper chord 1, the right upper chord 2, the left lower chord 3, and the right lower chord 4 into a whole. Tie rods 9 are obliquely connected between the left upper chord 1, the right upper chord 2, the left lower chord 3, the right lower chord 4, the cross beam 5, the web member 6, the upper horizontal longitudinal link 7 and the lower horizontal longitudinal link 8. The main truss structure and the whole connected with the portal frame and the main truss structure all adopt a circular steel pipe section.

[0038] The left upper chord 1 and the right upper chord 2 start to extend along the bridge curve at the support axis A and the support axis B; the right upper chord 2 located at the support axis A extends in a curve toward the right lower chord 4 in the direction of the support axis B, and merges with the right lower chord 4 to form a chord near the support axis B; the left upper chord 1 located at the support axis A extends in a curve toward the right upper chord 2 in the direction of the support axis B, and merges with the right lower chord 4 to form a chord near the support axis B; the left lower chord 3 located at the support axis A is divided into two, and the separated part is twisted to form the left upper chord 1 at the support axis B. The left upper chord 1, the right upper chord 2, the left lower chord 3 and the right lower chord 4 and the support axis A and the support axis B can also be twisted in reverse. When the spatial positions of the left upper chord 1, the right upper chord 2, the left lower chord 3 and the right lower chord 4 change, the web members 6, the upper parallel joints 7 and the lower parallel joints 8 are still required to be evenly distributed in the transverse direction of the bridge to form a closed portal frame, and the left upper chord 1, the right upper chord 2, the left lower chord 3 and the right lower chord 4 are connected as a whole. By merging the right lower chord and the right lower chord 4 into a chord, dividing the left lower chord into two parts and twisting them into the left upper chord, and twisting the left upper chord into the right upper chord, the required spatial twisting architectural shape is designed, without adding too much architectural decoration materials, and the force requirements of the bridge structure itself are combined with the architectural shape requirements, which is more economical and reasonable than conventional methods, has a larger spanning capacity, and solves the problem of incompatibility between truss bridges and urban landscapes.

[0039] There are four groups of supports 12 symmetrically arranged, two groups of end supports located at the end points of the truss structure and another two groups of supports I and supports II located at support axis A and support axis B; the left lower chord 3 and the right lower chord 4 are placed in parallel and extend in a straight line along the bridge direction, the left upper chord 1 and the right upper chord 2 are respectively parallel to the left lower chord 3 and the right lower chord 4 on the end supports and extend in a straight line along the bridge direction to the positions of support axis A and support axis B, and the left upper chord 1 and the right upper chord 2 extend in a spatial curve along the bridge direction between support I and support II respectively.

[0040] See also Figure 5 The calculation model of a truss bridge with a spatial torsion shape shown in FIG. 1 needs to adopt a three-dimensional space numerical analysis model. The calculation model requires:

[0041] J1: The main load-bearing members of the truss must form lines with spatial coordinates and be consistent with reality.

[0042] J2: Each component is simulated using a beam element with seven degrees of freedom.

[0043] J3: Apply actual loads to the three-dimensional beam unit, and consider the effects of temperature, support 12 displacement, etc.

[0044] J4: The boundary conditions are simulated in three-dimensional space according to the allowable displacement of the designed support 12.

[0045] A method for constructing a truss bridge with a spatial torsion shape, using the truss bridge structure of this embodiment, comprises the following steps:

[0046] S1: Construction of the substructure piers 11 of the bridge and the supports 12 on the piers 11 for supporting the entire bridge truss structure.

[0047] S2: Two standard sections and one variable section are prefabricated in the factory; the section between the end supports and supports I and II is the standard section, and the section between supports I and II is the variable section, wherein the spatial curve variable section of the chord should be divided into multiple prefabricated segment units along the web member 6 spacing, so that the spatial variation curve of the chord is divided into several sections.

[0048] S3: Assemble the steel structure components of each prefabricated segment unit, connect the rods through welds, weld the two ends of the variable segment to the two standard segments to form a whole, and then transport it to the bridge site.

[0049] S4: Temporary piers are set up at the connection positions of each segment, and each segment unit is hoisted onto the temporary piers and then welded into a whole.

[0050] S5: Construction of bridge deck 10 and other ancillary facilities.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A truss bridge with a spatial torsion shape, characterized in that: A truss bridge with a spatial torsion shape, in which the parallel and straight-extending main truss chord structures of a traditional truss bridge are designed into interlaced curved chord structures, and has a spatial torsion shape, including a main truss structure, a plurality of portal frames evenly distributed on the main truss structure along the bridge direction, a bridge deck, piers supporting the entire bridge truss structure, and supports arranged between the piers and the truss structure; The main truss structure includes a left upper chord, a right upper chord, a left lower chord and a right lower chord; the portal frame is formed by a crossbeam, a web member, an upper horizontal longitudinal link and a lower horizontal longitudinal link closed in a transverse direction of the bridge; the bridge deck is located on the lower horizontal longitudinal link and the crossbeam; the portal frame connects the left upper chord, the right upper chord, the left lower chord and the right lower chord into a whole; The left upper chord and the right upper chord start to extend along the bridge at the support axis A and the support axis B; the right upper chord located at the support axis A extends in a curve toward the right lower chord in the direction of the support axis B, and merges with the right lower chord to form a chord in the range close to the support axis B; The left upper chord rod located at the support axis A extends in a curve toward the right upper chord rod in the direction of the support axis B, and becomes the right upper chord rod near the support axis B. The left lower chord located at the A support axis is divided into two, and the separated chord extends toward the B support axis to become the left upper chord at the B support axis.

2. The truss bridge with a spatial torsion shape according to claim 1, characterized in that: The supports are symmetrically arranged in four groups, two groups of end supports located at the end points of the truss structure and another two groups of supports I and supports II located at support axis A and support axis B; the left lower chord and the right lower chord are placed in parallel and extend in a straight line along the bridge direction, the left upper chord and the right upper chord are respectively parallel to the left lower chord and the right lower chord on the end supports and extend in a straight line along the bridge direction to the positions of support axis A and support axis B, and the left upper chord and the right upper chord extend in a spatial curve between support I and support II respectively.

3. The truss bridge with a spatial torsion shape according to claim 2, characterized in that: The left upper chord, the right upper chord, the left lower chord, the right lower chord, the support shaft A and the support shaft B can also be reversely twisted.

4. The truss bridge with a spatial torsion shape according to claim 2, characterized in that: When the spatial positions of the left upper chord, the right upper chord, the left lower chord and the right lower chord change, the cross beams, the web members, the upper horizontal longitudinal links and the lower horizontal longitudinal links are still required to be evenly distributed in the transverse direction to form a closed portal frame, connecting the left upper chord, the right upper chord, the left lower chord and the right lower chord into a whole.

5. The truss bridge with a spatial torsion shape according to claim 4, characterized in that: The main truss structure, the portal frame and the main truss structure are connected to form a whole body that all adopts a circular steel pipe cross-section.

6. The truss bridge with a spatial torsion shape as claimed in claim 2, characterized in that: Tie rods are obliquely connected between the left upper chord, the right upper chord, the left lower chord, the right lower chord, the cross beam, the web member, the upper horizontal longitudinal joint and the lower horizontal longitudinal joint.

7. A construction method for a truss bridge with a spatial torsion shape according to any one of claims 2 to 6, characterized in that: The following steps are involved: S1: Construction of the substructure piers of the bridge and the bearings on the piers used to support the entire bridge truss structure; S2: Two standard sections and one variable section are prefabricated in the factory; the section between the end support and support I and support II is the standard section, and the section between support I and support II is the variable section; S3: Weld the two ends of the variable section and the two standard sections to form a whole, and then transport it to the bridge site; S4: Temporary piers are set at the connection positions of each segment, and each segment unit is hoisted onto the temporary piers and then welded into a whole; S5: Construction of bridge deck and other ancillary facilities.

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