An asymmetric longitudinal slope vertical curve bridge structure and a design method and device thereof

Abstract

The application discloses a vertical curve bridge structure of asymmetric longitudinal slope and a design method and device thereof, and relates to the technical field of bridge design.The design method comprises the following steps: taking any one end point of a tie rod vertical curve as a rotation original point, rotating the other end point by a set angle until the line connecting the two end points is horizontal; determining an arch rib and all hangers according to the rotated tie rod vertical curve to form a whole vertical curve bridge structure; taking any one end point of the tie rod vertical curve as the rotation original point, inversely rotating the whole vertical curve bridge structure by a set angle until the two end points of the tie rod vertical curve respectively coincide with two supporting points. The application further provides a design device for implementing the above design method and a bridge designed by the design method. By rotating the tie rod vertical curve with any one end point as the rotation original point until the symmetry axis of the tie rod vertical curve coincides with the plumb line, the design of the hangers and the arch rib can be performed in a symmetrical design manner, and the design and manufacturing difficulty is greatly simplified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge design, in particular to an asymmetric longitudinal slope vertical curve bridge structure and a design method and device thereof. BACKGROUND

[0002] With the increasing number of contemporary bridge constructions, due to factors such as topographic changes, under-bridge navigation clearance, under-bridge traffic clearance, and surface drainage, it is necessary to set a longitudinal slope of the bridge. However, when designing the overall alignment of the bridge, for important and complex node bridges, it is often difficult to design the girder alignment of the bridge according to the symmetry principle of the longitudinal slope, and the vertex of the longitudinal slope is often difficult to set at the midspan and the longitudinal slopes on the left and right sides of the midspan are difficult to be symmetrically arranged.

[0003] In the prior art, when designing such an important bridge with asymmetric alignment, the usual practice is to design and manufacture according to the actual alignment of the main girder, which results in asymmetric structure design, doubling the workload of drawing design, and in addition, the structure processing and manufacturing are complicated, which increases the investment and the probability of errors, and thus reduces the overall efficiency of design and manufacturing. SUMMARY

[0004] In view of the defects in the prior art, the purpose of the present application is to provide an asymmetric longitudinal slope vertical curve bridge structure and a design method and device thereof to solve the problem of complex design and large structure processing and manufacturing difficulty of the asymmetric longitudinal slope vertical curve bridge in the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the present application is as follows:

[0006] In a first aspect, the present application provides a design method for an asymmetric longitudinal slope vertical curve bridge structure, comprising the following steps:

[0007] Taking any one end point of the tie rod vertical curve as the rotation origin, rotating the other end point by a set angle until the line connecting the two end points is horizontal;

[0008] According to the rotated tie rod vertical curve, determine the arch rib and all the hangers to form the overall vertical curve bridge structure;

[0009] Taking the above any one end point of the tie rod vertical curve as the rotation origin, rotating the above vertical curve bridge structure by a set angle in the opposite direction until the two end points of the tie rod vertical curve respectively coincide with the two support points.

[0010] In some optional embodiments, the tie rod vertical curve is determined according to the longitudinal bridge direction two support points, the set radius and the slope of the two side longitudinal slopes.

[0011] In some optional embodiments, the tie rod vertical curve of the bridge structure is determined according to the longitudinal bridge direction two support points, the set radius and the slope of the two side longitudinal slopes, comprising:

[0012] determine the center of the curve line of the truss according to the slopes of the two branch points and the two side slopes in the longitudinal direction of the bridge;

[0013] determine the vertical curve of the truss according to the center of the vertical curve of the truss and the set radius.

[0014] In some optional embodiments, the center of the vertical curve of the truss is determined according to the slopes of the two branch points and the two side slopes in the longitudinal direction of the bridge, including:

[0015] determine the line connecting the two side slopes according to the slopes of the two branch points and the two side slopes in the longitudinal direction of the bridge;

[0016] determine the bisector of the angle between the two lines according to the line connecting the two side slopes;

[0017] determine the center of the vertical curve of the truss according to the bisector of the angle and the vertical curve of the truss.

[0018] In some optional embodiments, all the hangers are determined according to the vertical curve of the truss after rotation, including:

[0019] take the central axis of the vertical curve of the truss after rotation as the design position of the central hanger;

[0020] set multiple side hangers at equal intervals on both sides of the longitudinal direction of the bridge according to the design position of the central hanger.

[0021] In some optional embodiments, the arch rib is determined according to the central axis of the vertical curve of the truss and the force requirement.

[0022] In some optional embodiments, the lengths of the multiple side hangers gradually decrease in the direction of the end of the vertical curve of the truss.

[0023] In some optional embodiments, the angle between the hanger and the vertical plane is the set angle.

[0024] In the second aspect, the application further provides a vertical curve bridge structure design device for an asymmetric side slope, which is used to implement any of the above design methods and includes:

[0025] a pre-adjustment module for rotating one end point of the vertical curve of the truss as the rotation origin and rotating the other end point by a set angle until the line connecting the two end points is horizontal;

[0026] a whole structure forming module for determining the arch rib and all the hangers according to the vertical curve of the truss after rotation to form the whole vertical curve bridge structure;

[0027] a whole structure determining module for rotating the whole vertical curve bridge structure in the reverse direction by a set angle with any of the end points of the vertical curve of the truss as the rotation origin until the two end points of the vertical curve of the truss coincide with the two branch points, respectively.

[0028] In a third aspect, the application also provides a vertical curve bridge structure with asymmetric longitudinal slope, which is designed according to any of the above design methods.

[0029] Compared with the prior art, the application has the following advantages:

[0030] By rotating the tie rod vertical curve with any end point as the rotation origin, the symmetry axis of the tie rod vertical curve is made to coincide with the plumb line, so that the design of the hanger and the arch rib can be performed in a symmetrical design manner. In this way, not only the design steps are simplified, but also the structural components such as the tie rods, hangers and arch ribs in the vertical curve bridge structure can be processed in pairs, which facilitates processing and installation, greatly simplifies the design and manufacturing difficulty, significantly reduces the workload of drawing design and processing and manufacturing, avoids complicated and complex work, reduces the error probability and various inputs, improves the overall efficiency, and has significant comprehensive benefits. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0032] Figure 1 The schematic diagram of step S1 of the design method of the vertical curve bridge structure with asymmetric longitudinal slope of the application;

[0033] Figure 2 The schematic diagram of step S2 of the application;

[0034] Figure 3 The schematic diagram of step S3 of the application;

[0035] Figure 4 The structural schematic diagram of the vertical curve bridge structure with asymmetric longitudinal slope of the application.

[0036] In the figure: 1, fulcrum; 2, tie rod vertical curve; 3, hanger; 31, central hanger; 32, side hanger; 4, arch rib. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the application more clear, the technical solutions in the embodiments of the application will be described clearly and completely below in combination with the drawings in the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, not all. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0038] The embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0039] First, the prior art is introduced: as a member of the arch bridge family, the tied arch bridge has the general characteristics of arch bridges and its own unique characteristics. It is a bridge type that combines the advantages of arches and beams. It combines arches and beams together to bear loads, fully utilizes the structural performance of beam bending and arch compression, and uses tie rods to bear the horizontal thrust at the arch end, so that the horizontal thrust at the arch end support is not generated.

[0040] Therefore, the tied arch bridge generally includes tie rods, arch ribs and suspenders, and the arrangement of the tie rods is a key problem in the design of the tied arch. On the one hand, the connection between the tie rods and the arch ribs should be considered to ensure that the tie rods can well bear loads together with the arch ribs; on the other hand, the interaction between the tie rods and the driving lanes should be considered to avoid the destruction of the bridge driving lanes due to the obstruction of the tie rods.

[0041] In order to facilitate the construction connection at the support node, the arch ribs and the tie rods are usually designed to have the same cross-sectional form. The I-shaped cross-section is usually used for small and medium span arch bridges, and the box-shaped cross-section is usually used when the span is large. The suspender is usually a slender member, which is usually considered as an axial force member in design, and the current development trend is to use high-strength steel wire or thick steel bars.

[0042] When designing the asymmetric linear bridge under the condition of asymmetric left and right longitudinal slopes, due to the asymmetry of the bridge structure and the asymmetric vertical curve of the top surface of all tie rods, the tie rods, the arch ribs and the suspenders cannot be designed with the plumb line as the symmetry axis. Especially for the tie rods and the suspenders, they are usually designed based on the plumb direction as the reference, so that the I-shaped cross-section and the length of the assembled body at all parts of the bridge are different, which not only needs to be processed and installed respectively, but also needs to be designed respectively.

[0043] In order to reduce the design and construction cost and the processing and installation difficulty of the asymmetric tied arch bridge, in the first aspect, the present application provides a vertical curve bridge structure design method for asymmetric longitudinal slopes, comprising the following steps:

[0044] S1: taking any one end point of the tie rod vertical curve 2 as the rotation origin, rotating the other end point by a set angle until the line connecting the two end points is horizontal.

[0045] It can be understood that, due to the different slopes of the two longitudinal slopes, the two end points of the tie rod vertical curve 2 are different in height, so in the initial design, the tie rod vertical curve 2 needs to be rotated to make the two end points on the same horizontal line, and the asymmetric tie rod vertical curve is changed into a symmetric structure with the plumb surface as the symmetry axis, so as to provide a symmetric structure basis for the subsequent design of the arch ribs and the suspenders.

[0046] In Figure 1 , the two end points of the tie rod vertical curve 2 are the two support points 1# and 2#, which are also the two support points of the final vertical curve bridge structure as a whole.

[0047] In some optional embodiments, the tie rod vertical curve 2 is determined according to the longitudinal bridge direction two support points 1, the radius and the slope of the two side longitudinal slopes.

[0048] Specifically, according to the longitudinal bridge direction two support points 1, the radius and the slope of the two side longitudinal slopes, the tie rod vertical curve 2 of the bridge structure is determined, comprising:

[0049] According to the longitudinal bridge direction two support points 1 and the slope of the two side longitudinal slopes, the center of the tie rod vertical curve 2 is determined; according to the center of the tie rod vertical curve 2, the tie rod vertical curve 2 is determined in combination with the above-mentioned set radius.

[0050] In this example, first, according to the longitudinal bridge direction two support points 1 and the slope of the two side longitudinal slopes, the connecting line of the two longitudinal slopes is determined. That is, taking the longitudinal bridge direction two support points 1# and 2# as the starting point, and combining the longitudinal slope slopes i1 and i2 corresponding to the two support points 1# and 2#, the connecting lines are drawn respectively, so that the two connecting lines intersect.

[0051] Then, according to the connecting line of the two longitudinal slopes, the bisector of the included angle of the two connecting lines is determined. Since the tie rod vertical curve is a non-symmetrical structure at this time, the bisector of the included angle of the two connecting lines and the plumb line form an included angle.

[0052] Finally, according to the above-mentioned included angle bisector and the above-mentioned set radius, the center of the tie rod vertical curve 2 is determined.

[0053] After the center of the tie rod vertical curve is determined, the above-mentioned two support points 1# and 2# are taken as the two end points of the tie rod vertical curve 2 and are made into an arc, and the curve obtained is the tie rod vertical curve.

[0054] Here, the tie rod vertical curve is the curve formed by all the tie rod top surfaces. The determination of the tie rod vertical curve lays the foundation for the arrangement and structure of the tie rod, and also facilitates the manufacturing of the beam body in the later stage.

[0055] After the line type of the tie rod vertical curve is determined, the design of the arch rib and the sling can be carried out based on the tie rod vertical curve.

[0056] Taking the figure as an example, taking the 1# support point as the rotation origin, rotating the 2# support point counterclockwise by an angle of α2, so that the 1# support point and the 2# support point are located on the same horizontal line Z2. At this time, the bisector of the included angle of the two longitudinal slope connecting lines coincides with the plumb line, and at the same time, the central axis of the tie rod vertical curve also coincides with the plumb line.

[0057] S2: According to the rotated tie rod vertical curve 2, the arch rib 4 and all the slings 3 are determined to form the vertical curve bridge structure as a whole.

[0058] by Figure 3 For example, after the tie rod vertical curve 2 is rotated, its central axis coincides with the vertical line. Therefore, the design of the arch rib and each suspension cable can be started with the central axis of the rotated tie rod vertical curve 2 as the axis of symmetry. The tie rod, arch rib, suspension cable, etc. are all designed with the central axis of the tie rod vertical curve 2 as the axis of symmetry, which simplifies the design steps and the processing difficulty of each structural component.

[0059] Specifically, when designing each sling 3, the central axis of the vertical curve 2 of the tie rod after rotation is taken as the design position of the central sling 31; based on the design position of the central sling 31, multiple side slings 32 are set at equal intervals on both sides of the longitudinal bridge.

[0060] In other words, first determine the design position of the central sling 31, which coincides with the central axis of the vertical curve 2 of the tie rod. Then, determine the length of the central sling 31 in combination with the stress requirements.

[0061] With the central suspension cable 31 as the reference, side suspension cables 32 are designed at intervals on both sides of the longitudinal direction of the bridge. At this time, all the side suspension cables on the left side of the central suspension cable 31 and all the side suspension cables on the right side of the central suspension cable 31 are set symmetrically with the central suspension cable 31 as the axis.

[0062] Understandably, the length of the side suspension cable 32 is set according to the force requirements, and the length of the side suspension cable gradually decreases as it approaches the two side support points 1.

[0063] When designing arch rib 4, the central axis of the vertical curve 2 of the tie rod is used as the axis of symmetry, and the shape of arch rib 4 is determined in combination with the stress requirements.

[0064] In other words, the arch rib 4 is also designed with the central axis of the vertical curve 2 of the tie rod as the axis of symmetry.

[0065] It should be noted that the arch ribs can be designed first and then the suspension cables can be designed, or the suspension cables can be determined first and then the arch ribs can be designed. Those skilled in the art can make the appropriate choice according to the stress requirements and design requirements, and no specific restrictions are imposed here.

[0066] S3: Using either of the above-mentioned endpoints of the tie rod vertical curve 2 as the origin of rotation, rotate the above-mentioned vertical curve bridge structure in the opposite direction by the set angle until the two endpoints of the tie rod vertical curve 2 coincide with the two support points 1 respectively.

[0067] It is understandable that once the overall vertical curve bridge structure is designed and completed, the aforementioned set angle is reversed to bring it back to the completed bridge state.

[0068] by Figure 4For example, still taking the 1# fulcrum as the rotation origin, the 2# fulcrum is rotated clockwise by an angle of α2, so that the two end points of the tie rod vertical curve 2 coincide with the 1# and 2# fulcrums respectively, and at this time, the vertical curve bridge structure in the bridge state is obtained.

[0069] At this time, the angle between the sling 3 and the plumb line is the set angle.

[0070] Therefore, the tie rod vertical curve 2 is rotated with any end point as the rotation origin, so that the symmetry axis coincides with the plumb line, and thus the design of the sling and the arch rib can be performed in a symmetrical design manner. In this way, the design steps are simplified, and meanwhile, the structural components such as the tie rods, slings and arch ribs in the vertical curve bridge structure can be processed in pairs, which facilitates the processing and installation.

[0071] It should be noted that although the lengths, cross-sectional shapes and installation positions of the arch rib, tie rods and slings are different from those designed in the asymmetric state, the difference will not affect the overall stability and stress performance of the bridge structure.

[0072] In a second aspect, the application further provides a vertical curve bridge structure design device for an asymmetric longitudinal slope, which is used to implement any of the above design methods and includes a pre-adjustment module, an overall structure forming module and an overall structure determining module.

[0073] Specifically, the pre-adjustment module is used to rotate the other end point by a set angle with any end point of the tie rod vertical curve 2 as the rotation origin until the line connecting the two end points is horizontal; the overall structure forming module is used to determine the arch rib 4 and all slings 3 according to the rotated tie rod vertical curve 2 to form the overall vertical curve bridge structure; and the overall structure determining module is used to rotate the overall vertical curve bridge structure by a set angle in the reverse direction with any end point of the tie rod vertical curve 2 as the rotation origin until the two end points of the tie rod vertical curve 2 coincide with the two fulcrums 1 respectively.

[0074] It can be understood that by inputting the line type of the tie rod vertical curve 2 into the pre-adjustment module, the tie rod vertical curve 2 can be taken as the design reference, the tie rod vertical curve 2 is rotated so that the symmetry axis coincides with the plumb line, then the arch rib and the sling are designed according to the symmetry axis of the rotated tie rod vertical curve as the symmetry axis of the overall vertical curve bridge structure by the overall structure forming module, and finally the overall vertical curve bridge structure is rotated by a set angle to the bridge state by the overall structure determining module, so that the processing and installation of each structure can be performed according to the bridge state.

[0075] In a third aspect, the application further provides a vertical curve bridge structure for an asymmetric longitudinal slope, which is designed according to any of the above design methods.

[0076] It can be understood that the vertical curve bridge structure designed by the design method of the application has certain differences with the bridge structure directly designed in an asymmetric manner, but the overall stability, deformation and stress performance of the completed bridge structure are not affected through numerical simulation stress analysis and the like.

[0077] The vertical curve bridge structure of the asymmetric longitudinal slope and the design method and design device thereof can rotate the tie rod vertical curve 2 with any end point as the rotation origin, so that the symmetry axis coincides with the plumb line, and the design of the sling and the arch rib can be performed in a symmetric design manner. In this way, not only the design steps are simplified, but also the various structural components such as tie rods, slings and arch ribs in the vertical curve bridge structure can be processed in pairs, which facilitates processing and installation, greatly simplifies the design and manufacturing difficulty, significantly reduces the workload of drawing design and processing and manufacturing, avoids complicated and complex work, reduces the error probability and various inputs, improves the overall efficiency, and the comprehensive benefits are significant.

[0078] In the description of the application, it should be noted that the terms "upper", "lower", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. Unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be weldedly connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0079] It should be noted that in the present application, relational terms such as "first" and "second" and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0080] The foregoing detailed description of the application has been presented for purposes of illustration and description. Various modifications and changes can be made to these embodiments without departing from the spirit and scope of the application. It is intended that the scope of the application should not be limited by the particular representative embodiments described above.

Claims

1. A method for designing a vertical curve bridge structure of asymmetric longitudinal slope, characterized in that, The method comprises the following steps: rotating one end point of the tie rod vertical curve (2) as the rotation origin to the other end point by a set angle until the line connecting the two end points is horizontal; determining the arch rib (4) and all the suspender (3) according to the rotated tie rod vertical curve (2) to form the whole vertical curve bridge structure; reversely rotating the whole vertical curve bridge structure by the set angle with the said any end point of the tie rod vertical curve (2) as the rotation origin until the two end points of the tie rod vertical curve (2) respectively coincide with the two support points (1).

2. The design method of claim 1, wherein, The tie rod vertical curve (2) is determined according to the two support points (1) in the longitudinal direction of the bridge, the set radius and the slope of the two side longitudinal slopes.

3. The design method of claim 2, wherein, The tie rod vertical curve (2) of the bridge structure is determined according to the two support points (1) in the longitudinal direction of the bridge, the set radius and the slope of the two side longitudinal slopes, comprising: determining the center of the tie rod vertical curve (2) according to the two support points (1) in the longitudinal direction of the bridge and the slope of the two side longitudinal slopes; determining the tie rod vertical curve (2) according to the center of the tie rod vertical curve (2) and the set radius.

4. The design method of claim 3, wherein, The center of the tie rod vertical curve (2) is determined according to the two support points (1) in the longitudinal direction of the bridge and the slope of the two side longitudinal slopes, comprising: determining the line connecting the two longitudinal slopes according to the two support points (1) in the longitudinal direction of the bridge and the slope of the two side longitudinal slopes; determining the bisector of the included angle between the two lines according to the line connecting the two longitudinal slopes; determining the center of the tie rod vertical curve (2) according to the bisector of the included angle and the tie rod vertical curve.

5. The design method of claim 1, wherein, Determining all the suspender (3) according to the rotated tie rod vertical curve (2) comprises: taking the central axis of the rotated tie rod vertical curve (2) as the design position of the central suspender (31); arranging multiple side suspenders (32) at equal intervals on both sides of the central suspender (31) according to the design position of the central suspender (31).

6. The design method of claim 1, wherein, Determining the arch rib (4) with the central axis of the tie rod vertical curve (2) as the axis of symmetry and in combination with the stress requirement.

7. The design method of claim 5, wherein, The lengths of the multiple side suspenders (32) gradually decrease towards the end of the tie rod vertical curve (2).

8. The design method of claim 1, wherein, The included angle between the suspender (3) and the plumb line is the set angle.

9. A design device for a vertical curve bridge structure with an asymmetric longitudinal slope, characterized in that, The method comprises: a pre-adjustment module for rotating one end point of the tie rod vertical curve (2) as the rotation origin to the other end point by a set angle until the line connecting the two end points is horizontal; a whole structure forming module for determining the arch rib (4) and all the suspender (3) according to the rotated tie rod vertical curve (2) to form the whole vertical curve bridge structure; a whole structure determining module for reversely rotating the whole vertical curve bridge structure by the set angle with the said any end point of the tie rod vertical curve (2) as the rotation origin until the two end points of the tie rod vertical curve (2) respectively coincide with the two support points (1).

10. A vertical curve bridge structure of asymmetric longitudinal slope, characterized by, The method is designed according to any one of claims 1-8.

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