Design and construction method of steel structure bridge temperature span structure
By setting a fracture joint and a mid-span expansion device in the mid-span section of the steel structure bridge, the problem of incoordination between the deformation of the beam and the ballastless track caused by the temperature span of the long-span bridge is solved, the structural stress optimization and investment savings are achieved, and it is suitable for the design and construction of long-span steel structure bridges.
Patent Information
- Application Number
- CN202510765355.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-10
- Publication Date
- 2025-10-17
AI Technical Summary
In existing steel structure bridges with large spans and ballastless tracks, the excessively long temperature span leads to inconsistent deformation between the beam and the ballastless track. This requires expensive rail temperature regulators and places high demands on the alignment, impacting project investment and line selection.
A longitudinal fracture is set in the mid-span section of the beam, and a mid-span expansion device is set at the fracture position to allow the beams on both sides of the fracture to move along the bridge direction. The bending moment and shear force are transmitted through the expansion device, thereby optimizing the structural stress and shortening the temperature span.
By optimizing the structural stress, shortening the temperature span, avoiding the use of rail temperature regulators, ensuring the coordination of beam and ballastless track deformation, saving investment, and improving the line shape, it is suitable for large-span steel structure bridges.
Smart Images
Figure CN120805233A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of bridge structure design, and in particular to a design and construction method of a temperature span structure of a steel structure bridge. Background Art
[0002] With the development of high-speed railways and rail transit, ballastless track bridges are being used more and more, and a large number of large-span ballastless track bridges have been produced. However, ballastless tracks have high requirements for temperature resistance.
[0003] like Figure 1 As shown in the figure, the temperature span of a continuous steel structure or steel-concrete hybrid beam is the length from the fixed support to the beam end, which is L. If this length exceeds the normal temperature span, it is likely to cause deformation disharmony between the beam and the ballastless track, which requires adjustment using a rail temperature regulator. However, rail temperature regulators are not only expensive and increase project investment, but also have high requirements for alignment. In fact, the inability to set the track temperature on long-span bridges can even affect the overall alignment. Summary of the Invention
[0004] The purpose of the present invention is to provide a design and construction method for the temperature span structure of a steel structure bridge based on the above-mentioned shortcomings of the existing technology. By setting a longitudinal fracture in the mid-span section of the beam body, the beam body on both sides of the fracture can move along the bridge direction, and the bending moment and shear force are transmitted through the mid-span expansion device set at the fracture position, thereby optimizing the structural stress, greatly shortening the temperature span of the steel structure bridge, and ensuring the coordination of the deformation of the beam body and the ballastless track.
[0005] The purpose of the present invention is achieved by the following technical solutions: A design and construction method for a temperature span structure of a steel structure bridge comprises a main pier, a side pier and a beam, wherein the beam is supported on the main pier and the side pier, the beam comprises a mid-span section and a side span section, and a ballastless track is arranged above the beam. The method is characterized in that: by providing a fracture in the mid-span section of the beam and providing a mid-span expansion device at the position of the fracture, the beam is simultaneously consolidated with the main pier, so that the beams on both sides of the fracture can freely displace along the bridge direction and the temperature span is from the main pier to the beam end or from the main pier to the mid-span.
[0006] The mid-span telescopic device includes a first telescopic member and a second telescopic member. The first telescopic member is arranged on the adjacent end faces of the beam body on both sides of the fracture. Both of the first telescopic members are provided with bends on the upper and lower sides. The second telescopic member is clamped with the bent parts of the first telescopic members on both sides.
[0007] The bending and shearing strengths of the first telescopic member and the second telescopic member are not less than the structural strength of the beam body.
[0008] During construction, the following steps are included: The main pier is fixed with the beam body, when the beam body is a steel concrete structure, the pier beam is directly poured synchronously, the steel concrete joint section is constructed later, the steel beam closing point is reserved, when the beam body adopts a pure steel structure, the steel beam is wrapped with concrete to achieve the effect of fixation, and the closing point is reserved later; The first expansion component and the second expansion component are correspondingly embedded on the top plate, the bottom plate and the web plate of the beam body, and the first expansion component and the second expansion component at the corresponding positions are clamped.
[0009] The midspan expansion device located on the top plate, the midspan expansion device located on the bottom plate and the midspan expansion device located on the web plate are arranged on different elevations on both sides of the midspan section centerline.
[0010] The first expansion component and the second expansion component are embedded in the respective corresponding beam body through the embedded part.
[0011] The steel structure bridge temperature span structure design and construction method according to claim 1, wherein the beam body of the side span section and the side pier below the beam body adopt a movable support in the bridge direction.
[0012] The advantages of the present application are: 1) The structure stress is optimized, and the steel structure bridge temperature span is greatly shortened.
[0013] 2) The shortened temperature span greatly improves the beam rail stress, avoids the use of rail temperature regulators, ensures the deformation coordination of the beam body and the ballastless track, thereby saving investment; due to the influence of not setting the rail temperature regulator, the large-span steel structure bridge alignment is no longer limited, which is more favorable for the route selection of railways and rail transit.
[0014] 3) After the temperature span is shortened, the fixed support of the middle support point is saved, and investment is saved.
[0015] 4) Due to the expansion device in the midspan in the bridge direction, the expansion of the main beam caused by temperature can be eliminated through the expansion device, so that the bending moment of the pier caused by the temperature rise and fall of the main beam is avoided, and the pier beam fixation is not affected by the height of the pier.
[0016] 5) The structure is simple and reasonable, can be embedded in the beam body during prefabrication and construction, is convenient for construction, and is suitable for promotion. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is a temperature span range diagram of a large-span steel structure continuous beam in the prior art; Figure 2 It is a structural diagram of the present application (including a temperature span range); Figure 3 It is a midspan elevation view of the present application; Figure 4 It is a top plate midspan elevation view of the present application; Figure 5 is a cross-sectional view of the base plate of the present application; Figure 6 is a bending moment diagram of a continuous beam of a large-span steel structure in the prior art; Figure 7 is a bending moment diagram of the present application; Figure 8 is a schematic diagram of the temperature span range and the main beam expansion direction of a continuous beam of a large-span steel structure in the prior art; Figure 9 is a schematic diagram of the temperature span range and the main beam expansion direction of the present application. DETAILED DESCRIPTION
[0018] The features of the present application and other related features are further described in detail below with reference to the accompanying drawings, which are provided to assist in the understanding of the present application by those skilled in the art: As shown in Figures 1-9 , the reference numerals 1-22 in the figure represent, respectively: a main pier 1, a beam body 2, a pier-beam consolidation point 3, a bridge-direction movable support 4, a temperature span 5, a mid-span expansion device 6, a top plate 7, a base plate 8, a pavement layer 9, a ballastless track 10, a top plate expansion embedded part 11, a base plate expansion embedded part 12, a top plate expansion member 13, a top plate expansion member 14, a left top plate 15, a right top plate 16, a left base plate 17, a right base plate 18, a base plate expansion member 19, a base plate expansion member 20, a joint 21, and a joint 22.
[0019] Embodiment: As shown in Figures 1 to 9 , the design and construction method of the temperature span structure of the steel structure bridge in this embodiment includes a main pier 1 and a beam body 2, wherein the beam body 2 is supported on the main pier 1 and the side piers. The beam body between the two main piers 1 is a mid-span section, and the beam body between the main pier and the side pier is a side span section. A pavement layer 9 is arranged above the beam body 2, and a ballastless track 10 is arranged on the pavement layer 9.
[0020] As shown in Figure 2 , in this embodiment, the main pier 1 and the beam body 2 are consolidated at the position of the pier-beam consolidation point 3, and the beam body 2 and the side pier adopt a bridge-direction movable support 4. A joint is arranged at the mid-span section, and a mid-span expansion device 6 is arranged at the joint. When the beam body 2 deforms, for example, the beam body 2 elongates or contracts due to temperature deformation caused by temperature rise and fall, the bridge-direction expansion is realized at the mid-span section position through the mid-span expansion device 6, so as to reduce the length of the temperature span 5. By comparing Figure 1 and Figure 2 , it can be seen that the length of the temperature span 5 in this embodiment is significantly smaller than the length L of the temperature span in the prior art.
[0021] As shown in Figure 3As shown, the beam body 2 includes a top plate 7, a bottom plate 8 and a web (not shown as it is an elevation view), and the mid-span expansion device 6 is arranged on the top plate 7, the bottom plate 8 and the web, and the mid-span expansion device 6 includes the top plate expansion embedded part 11, the bottom plate expansion embedded part 12 and the web expansion embedded part, so as to ensure that the beam body 2 can be expanded in the bridge direction.
[0022] As shown in the drawing, the top plate 7 of the beam body 2 is divided into the left top plate 15 and the right top plate 16 by the set joint 22. Figure 4 The top plate expansion embedded part 11 at the position of the set joint 22 includes the top plate expansion member 14 as the first expansion member and the top plate expansion member 13 as the second expansion member, and the top plate expansion member 14 is arranged at the beam body end face on both sides of the set joint 22, and the top plate expansion member 14 on both sides has the hook formed by bending on the upper side and the lower side. The top plate expansion member 13 has the buckle matched with the top plate expansion member 14; the top plate expansion member 13 is used to buckle the top plate expansion member 14 on both sides, so as to transmit the shear force and the bending moment, and ensure the free displacement of the expansion member and the top plate 7 in the bridge direction.
[0023] As shown in the drawing, the bottom plate 8 is also divided into the left bottom plate 17 and the right bottom plate 18 by the set joint 21, and the bottom plate expansion member 19 and the bottom plate expansion member 20 are arranged at the position of the set joint 21, and the bending moment and the shear force are transmitted by the mutual buckling of the bottom plate expansion member 19 and the bottom plate expansion member 20, so as to ensure the free displacement of the expansion member and the beam body bottom plate in the bridge direction. Figure 5 Similarly, the same mid-span expansion device 6 as the bottom plate 8 and the top plate 7 is arranged at the web position of the beam body 2, so as to ensure the free displacement of the expansion member and the beam body in the bridge direction.
[0024] As shown in the drawing, the mid-span expansion device 6 arranged on the bottom plate 8 and the top plate 7 is arranged on different elevations on both sides of the mid-span section center line of the beam body 2, so that the stress points of the beam body joints on both sides of the set joint are in different planes, and the structural performance of the beam body 2 is ensured, and there is no weak point. Similarly, the mid-span expansion device 6 arranged at the web position of the beam body is also arranged on different elevations.
[0025] Figure 3 As shown in the drawing, the fixed support between the main pier 1 and the beam body 2 is cancelled in the embodiment, and after consolidation, since the mid-span section of the beam body 2 can move in the bridge direction, the main pier 1 will not generate the bending moment due to the deformation of the beam body 2, so the height of the pier beam consolidation point 3 to the main pier 1 is not required, which is convenient for design and construction.
[0026] As shown in the drawing, the fixed support between the main pier 1 and the beam body 2 is cancelled in the embodiment, and after consolidation, since the mid-span section of the beam body 2 can move in the bridge direction, the main pier 1 will not generate the bending moment due to the deformation of the beam body 2, so the height of the pier beam consolidation point 3 to the main pier 1 is not required, which is convenient for design and construction. Figure 6 Figure 7 As shown in the drawing, the fixed support between the main pier 1 and the beam body 2 is cancelled in the embodiment, and after consolidation, since the mid-span section of the beam body 2 can move in the bridge direction, the main pier 1 will not generate the bending moment due to the deformation of the beam body 2, so the height of the pier beam consolidation point 3 to the main pier 1 is not required, which is convenient for design and construction.
[0027] As shown in the drawing, the fixed support between the main pier 1 and the beam body 2 is cancelled in the embodiment, and after consolidation, since the mid-span section of the beam body 2 can move in the bridge direction, the main pier 1 will not generate the bending moment due to the deformation of the beam body 2, so the height of the pier beam consolidation point 3 to the main pier 1 is not required, which is convenient for design and construction. Figure 8 Figure 9 As shown, the fixing position of the prior art large-span steel structure continuous beam is extended from the fixing support position to both sides, and the temperature span length is from the fixing support to the beam end. In the embodiment, the beam body 2 can be extended from the main pier 1 to both sides, and because the mid-span expansion device 6 is arranged in the mid-span section, the temperature span is divided into from the main pier 1 to the beam end or from the main pier 1 to the mid-span. In this way, the length of the temperature span is greatly shortened, and the effect is more significant for a multi-span continuous beam.
[0028] In the design and construction of the embodiment, the following steps are included: 1) According to the structure stress calculation, the size of the first expansion member and the second expansion member of the mid-span expansion device 6 is confirmed to ensure that the self bending and shearing strength of the first expansion member and the second expansion member is not less than the original structure strength, and there is no weak point in the member position.
[0029] 2) The beam body 2 and the main pier 1 are fixed at the pier beam fixing point 3 position, and the steel concrete structure can be directly poured simultaneously, and the steel concrete combination section is constructed later, and the steel beam closing point is reserved. When the beam body adopts a pure steel structure, the steel beam is wrapped with concrete to achieve the effect of fixation, and the closing point is reserved later.
[0030] 3) The first expansion member or the second expansion member of the mid-span expansion device 6 is embedded on the top plate 7, the bottom plate 8 and the web of the beam body 2, and the two are clamped.
[0031] 4) The additional expansion member is constructed, and finally the effect of transmitting bending moment and shear force and moving in the bridge direction can be achieved.
[0032] Although the above embodiment has made a detailed description of the concept and embodiment of the purpose of the present application with reference to the drawings, those skilled in the art can realize that various improvements and changes can be made to the present application without departing from the scope defined by the claims, and therefore are not described here.
Claims
1. A design and construction method for a temperature span structure of a steel bridge, comprising a main pier, a side pier, and a beam, wherein the beam is supported on the main pier and the side pier, the beam comprising a mid-span section and a side span section, and a ballastless track is disposed above the beam, characterized in that: The method provides a fracture in the mid-span section of the beam and a mid-span telescopic device at the position of the fracture, while consolidating the beam and the main pier, so that the beams on both sides of the fracture can freely move along the bridge direction and the temperature span is from the main pier to the beam end or from the main pier to the mid-span; the mid-span telescopic device includes a first telescopic member and a second telescopic member, the first telescopic members are provided at the adjacent end faces of the beam on both sides of the fracture, the two first telescopic members are both provided with bends on the upper and lower sides, and the second telescopic member is snap-connected with the bends of the first telescopic members on both sides.
2. The design and construction method of a temperature span structure for a steel bridge according to claim 1 is characterized by: The bending and shearing strengths of the first telescopic member and the second telescopic member are not less than the structural strength of the beam body.
3. The design and construction method of a temperature span structure for a steel bridge according to claim 1 is characterized by: During construction, the following steps are included: Consolidate the main pier and the beam. When the beam is a steel-concrete structure, the pier and beam are cast simultaneously, and then the steel-concrete joint section is constructed, and the closing point of the steel beam is reserved. When the beam adopts a pure steel structure, the steel beam is wrapped with concrete to achieve the consolidation effect, and the closing point is reserved later. The first telescopic member and the second telescopic member are correspondingly embedded in the top plate, the bottom plate and the web of the beam body, and the first telescopic member and the second telescopic member at corresponding positions are clamped together.
4. The design and construction method of a temperature span structure for a steel bridge according to claim 3 is characterized by: The mid-span telescopic device located on the top plate, the mid-span telescopic device located on the bottom plate and the mid-span telescopic device located on the web are arranged on different facades on both sides of the midline of the mid-span section.
5. The design and construction method of a temperature span structure for a steel bridge according to claim 3 is characterized by: The first telescopic member and the second telescopic member are embedded in their respective corresponding beam bodies through embedded parts.
6. The design and construction method of a temperature span structure for a steel bridge according to claim 1 is characterized by: A support that can move along the direction of the bridge is used between the beam body of the side span section and the side pier below it.