A temporary reinforcement method for steel truss girder segments
By adopting double-sided or single-sided reinforcement schemes based on the segmentation and stress conditions of the steel truss girder segments, and using flexible lightweight reinforcement components, the stability and economy issues of the steel truss girder segments during transportation and hoisting were solved, achieving a highly efficient reinforcement effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA RAILWAY MAJOR BRIDGE RECONNAISSANCE & DESIGN INSTITUTE CO LTD
- Filing Date
- 2023-07-05
- Publication Date
- 2026-05-26
AI Technical Summary
During transportation and hoisting, steel truss girder segments suffer from weak bending stiffness and poor stability, and existing reinforcement methods are characterized by large workloads and high costs.
Based on the segmentation and stress conditions of the steel truss girder segments, a double-sided or single-sided reinforcement scheme is adopted, flexible and lightweight reinforcement components are selected, an efficient vertical load transfer path is constructed, and flexible reinforcement is achieved by adding reinforcement components.
This improved the economy of steel truss segmental reinforcement, avoided blind reinforcement, made full use of the load-bearing capacity of permanent components, and achieved a reasonable stress state during the construction phase.
Smart Images
Figure CN116732909B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of temporary reinforcement technology for steel truss girder segments, specifically to a temporary reinforcement method for steel truss girder segments. Background Technology
[0002] On the one hand, due to limitations such as transportation conditions, hoisting capacity, and construction costs, steel truss girder segments are often transported and installed as single segments. Because the number of web members in the steel truss girder segments is small and the bending stiffness is relatively weak, the stability of the steel truss girder segments is poor, and they need to be reinforced to prevent excessive stress and deformation during the construction stage.
[0003] On the other hand, for statically indeterminate structures subjected to the same support and external forces, their equilibrium states are not unique. During the design process, different initial values for iterative design (tensile / compression design type of the reinforcement, cross-section of the reinforcement, stress-free length of the reinforcement) will result in different equilibrium states. The stress on the structure under different equilibrium states may vary significantly, and obtaining a reasonable equilibrium state is not a guaranteed occurrence.
[0004] In related technologies, steel truss girder segments are commonly reinforced using welded steel struts. The initial design of these struts often uses welded I-beams with tensile and compressive stiffness, and their stress-free length is typically taken as their corresponding geometric length. When assessing the stress on the segments during transport, the internal forces calculated for the struts are often compressive, thus involving stability issues. This leads to the selection of larger cross-sections for the final struts. Furthermore, due to the low reuse rate of these struts, temporary reinforcement work is often extensive, especially for long-span bridges, resulting in higher costs. Summary of the Invention
[0005] In view of the deficiencies in the existing technology, the purpose of this application is to provide a temporary reinforcement method for steel truss girder segments, which can flexibly reinforce different steel truss girder segments and maximize the economic efficiency of steel truss girder segment reinforcement measures.
[0006] To achieve the above objectives, the technical solution adopted is: a temporary reinforcement method for steel truss girder segments, comprising the following steps:
[0007] S1. Determine the support points for the steel truss girder segments during the construction phase;
[0008] S2. Assess the stress condition of the steel truss segments during the construction phase and determine whether reinforcement of the steel truss segments is required. If the stress and deformation of the steel truss segments meet the design requirements, no reinforcement is required, and proceed to step S7. If either the stress or deformation of the steel truss segments does not meet the design requirements, proceed to step S3.
[0009] S3. Based on the segmentation of the steel truss, select either a double-sided reinforcement scheme or a single-sided reinforcement scheme. If a single-sided reinforcement scheme is selected, proceed to step S41; if a double-sided reinforcement scheme is selected, proceed to step S42.
[0010] S41. Add a first or second reinforcement member according to the design of the tie rod, and add a third reinforcement member according to the design of the tension / compression rod, and determine the material, cross-section and stress-free length of each reinforcement member;
[0011] S42. Add a first and a second reinforcement according to the tie rod design, and optionally add a third reinforcement according to the tie rod design, and specify the material, cross-section and stress-free length of each reinforcement;
[0012] S5. Assess the stress condition of the reinforced steel truss segment during the construction phase, and determine whether the stress and deformation of the steel truss segment and each reinforcement component meet the design requirements; if yes, proceed to step S7; if no, proceed to step S6.
[0013] S6. Adjust the cross-sectional area and / or stress-free length of the reinforcement, and then proceed to step S5;
[0014] S7. End of design.
[0015] Based on the above technical solution, the construction stage in step S1 includes a transportation stage and a hoisting stage, and the support points for the steel truss girder segments in the proposed construction stage include:
[0016] Determine the transport support points at the bottom of the steel truss girder segment and the hoisting support points at the top of the steel truss girder segment.
[0017] Based on the above technical solution, each of the reinforcement components in steps S41 and S42 can be arranged in more than two sets in the transverse direction of the steel truss segment, and the reinforcement components can correspond to the upper and lower chords of the steel truss segment in the transverse direction, or correspond to the end of the crossbeam close to the chord.
[0018] Based on the above technical solution, in steps S41 and S42, the reinforcing member designed according to the tie rod can be a wire rope, chain hoist or steel tie rod, and the reinforcing member designed according to the tension and compression rod can be a welded I-beam.
[0019] Based on the above technical solution, the steel truss segment includes an upper chord, complete web members, a lower chord, a first web member to be connected, and a second web member to be connected; during the transportation stage, the combined structure of the upper chord, complete web members, the first web member to be connected, and the second web member to be connected has an upper equivalent center of gravity; during the hoisting stage, the combined structure of the lower chord, complete web members, the first web member to be connected, and the second web member to be connected has a lower equivalent center of gravity.
[0020] In step S42, the first and second reinforcement members are located on the longitudinal sides of the complete web member of the steel truss segment, respectively, and the optional third reinforcement member and the upper equivalent center of gravity are located on the longitudinal sides of the complete web member, respectively.
[0021] In steps S41 and S42, the connection positions of the ends of the first and second reinforcement members with the upper and lower chords are adjacent to the transport support point and the hoisting support point.
[0022] Based on the above technical solution, in step S41, the steel truss segment is provided with a third reinforcement member and a first or second reinforcement member. The two ends of the two reinforcement members are respectively connected to the upper chord and the lower chord. The two reinforcement members and the complete web member are located on the longitudinal sides of the upper equivalent center of gravity.
[0023] The beneficial effects of the technical solution provided in this application include:
[0024] The temporary reinforcement method for steel truss segments in this application selects either a double-sided or single-sided reinforcement scheme based on the segmentation and stress conditions (including gravity distribution characteristics) of the steel truss segments. When adding reinforcement components, flexible and lightweight components are mainly used to construct an efficient vertical load transfer path, thereby rationalizing the stress under different equilibrium states of the steel truss segments during the construction stage. The temporary reinforcement method in this application avoids blindly reinforcing the steel truss segments, fully utilizes the bearing capacity of the permanent components (including complete web members) of the steel truss segments, and can significantly improve the economy of reinforcement measures. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 A flowchart illustrating the temporary reinforcement method provided in the embodiments of this application;
[0027] Figure 2 This application provides a first segmentation scheme for a triangular truss formed by steel truss segments in an embodiment of the present application.
[0028] Figure 3 for Figure 2 One of the temporary reinforcement structures used during the hoisting stage of a steel truss girder segment;
[0029] Figure 4 This is a second segmentation scheme for the triangular truss formed by steel truss segments provided in the embodiments of this application;
[0030] Figure 5 for Figure 4 One of the temporary reinforcement structures used during the hoisting stage of a steel truss girder segment;
[0031] Figure 6This is a third segmentation scheme for the triangular truss formed by steel truss segments provided in the embodiments of this application;
[0032] Figure 7 for Figure 6 One of the temporary reinforcement structures used during the hoisting stage of a steel truss girder segment;
[0033] Figure 8 A segmentation scheme for an N-shaped truss formed by steel truss segments provided in the embodiments of this application;
[0034] Figure 9 for Figure 8 One of the temporary reinforcement structures used during the hoisting stage of a steel truss girder segment;
[0035] Reference numerals: 100, upper chord; 101, complete web member; 102, lower chord; 103, first web member to be connected; 104, second web member to be connected; 1, first reinforcement member; 2, second reinforcement member; 3, third reinforcement member; 10, first intersection point; 11, second intersection point. Detailed Implementation
[0036] To make the objectives, technical solutions, and advantages of this application clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0037] like Figure 1 As shown, a temporary reinforcement method for a steel truss segment includes the following steps:
[0038] S1. Determine the support points for the steel truss girder segments during the construction phase. Specifically, the support points include transportation support points and hoisting support points. The stress on the steel truss girder segments varies depending on the location of the support points; therefore, the support points for the steel truss girder segments must be determined first.
[0039] S2. Assess the stress condition of the steel truss segments during the construction phase to determine whether reinforcement is necessary. If both the stress and deformation of the steel truss segments meet the design requirements, no reinforcement is needed, and proceed to step S7. If either the stress or deformation of the steel truss segments does not meet the design requirements, proceed to step S3. Specifically, the weight, material, and dimensions of each structure of the designed steel truss segments are known. Based on these known conditions, stress analysis can be performed on the steel truss segments during the transportation and hoisting phases. Specifically, each structure of the steel truss segments has its own stress threshold and deformation threshold. If the calculated stress value is less than the stress threshold and the calculated deformation value is less than the deformation threshold, then the stress and deformation of the steel truss segments meet the design requirements; otherwise, they do not meet the design requirements.
[0040] S3. Based on the segmentation of the steel truss, select either a double-sided reinforcement scheme or a single-sided reinforcement scheme. If a single-sided reinforcement scheme is selected, proceed to step S41; if a double-sided reinforcement scheme is selected, proceed to step S42.
[0041] S41. If a single-sided reinforcement scheme is selected, a third reinforcement component 3 shall be added, and either the first reinforcement component 1 or the second reinforcement component 2 may be selected.
[0042] Specifically, a first reinforcement 1 or a second reinforcement 2 is added according to the design of the tie rod, and a third reinforcement 3 is added according to the design of the tension / compression rod. The material, cross-section and stress-free length of each reinforcement are also determined.
[0043] S42. If a double-sided reinforcement scheme is selected, a first reinforcement component 1 and a second reinforcement component 2 are added, and a third reinforcement component 3 may be added optionally.
[0044] Specifically, a first reinforcement 1 and a second reinforcement 2 are added according to the design of the tie rod, and a third reinforcement 3 is optionally added according to the design of the tie rod. The material, cross-section and stress-free length of each reinforcement are determined.
[0045] S5. Assess the stress condition of the reinforced steel truss segment during the construction phase, and determine whether the stress and deformation of the steel truss segment and each reinforcement component meet the design requirements; if yes, proceed to step S7; if no, proceed to step S6.
[0046] S6. Adjust the cross-sectional area and / or stress-free length of the reinforcement, and then proceed to step S5;
[0047] S7. End of design.
[0048] Furthermore, in step S1, the construction phase includes a transportation phase and a hoisting phase, and the support points for the steel truss girder segments to be constructed in the construction phase include:
[0049] Determine the transport support points at the bottom of the steel truss girder segment and the hoisting support points at the top of the steel truss girder segment.
[0050] Preferably, depending on the segmentation of the steel truss girder, a double-sided reinforcement scheme or a single-sided reinforcement scheme is selected, according to the following rules:
[0051] If the intersection of the complete web member 101 with the upper chord member 100 and the lower chord member 102 (for example) Figure 7 If the distance to the side end face of the entire steel truss segment is less than 4m, single-sided stiffening should be used; otherwise, double-sided stiffening should be used.
[0052] Furthermore, in steps S41 and S42, each of the reinforcing members (i.e., the first reinforcing member 1, the second reinforcing member 2, and the third reinforcing member 3) can be arranged in more than two sets in the transverse direction of the steel truss segment. The reinforcing members can correspond to the upper and lower chords of the steel truss segment in the transverse direction, or they can correspond to the end of the crossbeam near the chord. That is, the reinforcing members, the upper chord, and the lower chord can be located in the same plane, or the reinforcing members can be not in the same plane as the upper and lower chords. The two ends of the reinforcing members are connected to the ends of the crossbeam used to connect the chords.
[0053] Figure 2 The left and right directions are vertical. Figure 2 The left view is oriented horizontally.
[0054] Specifically, in steps S41 and S42, the reinforcement components designed for the tie rod can be steel wire rope, chain hoist, steel tie rod or welded I-beam, and the reinforcement components designed for the tension / compression rod can be welded I-beam.
[0055] Specifically, the reinforcement designed as a tie rod participates in the force when under tension, but does not participate in the force when under compression; the reinforcement designed as a tension-compression rod participates in the force when under both tension and compression.
[0056] Furthermore, the steel truss segment includes an upper chord 100, a complete web member 101, a lower chord 102, a first web member to be connected 103, and a second web member to be connected 104. During the transportation phase, the combined structure of the upper chord 100, the complete web member 101, the first web member to be connected 103, and the second web member to be connected 104 has an upper equivalent center of gravity. At this time, the lower chord 102 is supported, and the structure other than the lower chord 102 has an upper equivalent center of gravity.
[0057] During the hoisting phase, the combined structure of the lower chord 102, the complete web member 101, the first web member to be connected 103, and the second web member to be connected 104 has a lower equivalent center of gravity. At this time, the upper chord 100 is suspended, and the structure other than the upper chord 100 has an upper equivalent center of gravity.
[0058] In step S42, the first reinforcement 1 and the second reinforcement 2 are located on the longitudinal sides of the complete web member 101 of the steel truss segment, respectively, and the optional third reinforcement 3 and the upper equivalent center of gravity are located on the longitudinal sides of the complete web member 101, respectively.
[0059] In steps S41 and S42, the connection positions of the ends of the first reinforcing member 1 and the second reinforcing member 2 with the upper chord 100 and the lower chord 102 are adjacent to the transport support point and the hoisting support point, respectively. Specifically, the two ends of the first reinforcing member 1 are connected to the upper chord 100 and the lower chord 102, respectively, at the upper connection position and the lower connection position. The upper connection position is adjacent to the hoisting support point, and the lower connection position is adjacent to the transport support point.
[0060] Furthermore, the upper chord 100, the complete web member 101, and the first web member to be connected 103 intersect at the first intersection point 10, and the lower chord 102, the complete web member 101, and the second web member to be connected 104 intersect at the second intersection point 11.
[0061] Preferably, when the reinforcement is applied on both sides, one end of the third reinforcement member 3 is connected to the first intersection point 10, and the other end is connected to the second web member 104 to be connected; or one end of the third reinforcement member 3 is connected to the second intersection point 11, and the other end is connected to the lower chord member 102.
[0062] When reinforcing on one side, one end of the third reinforcing member 3 is connected to the first intersection 10, and the other end is connected to the lower chord 102; or one end of the third reinforcing member 3 is connected to the second intersection 11, and the other end is connected to the upper chord 100.
[0063] Further, in step S41, a third reinforcement 3 is provided for the steel truss segment, and one of the first reinforcement 1 and the second reinforcement 2 is selected according to the actual segmentation, for a total of two reinforcements. The two ends of the two reinforcements are respectively connected to the upper chord 100 and the lower chord 102, and the two reinforcements and the complete web member 101 are located on both longitudinal sides of the upper equivalent center of gravity.
[0064] Trusses composed of multiple steel truss segments come in various forms, including triangular trusses and N-shaped trusses.
[0065] In steps S41 and S42, the first reinforcement 1, the second reinforcement 2 and the third reinforcement 3 are selected by combining the upper equivalent center of gravity and the lower equivalent center of gravity.
[0066] like Figure 2 and Figure 3 In the first embodiment, according to the first segmentation scheme of the triangular truss formed by the steel truss segments, the middle vertical segment is selected and the double-sided reinforcement scheme is shown in the figure, which corresponds to S42.
[0067] According to the tie rod design, a first reinforcement 1, a second reinforcement 2, and a third reinforcement 3 are added. The connection points at both ends of the first reinforcement 1 and the second reinforcement 2 are adjacent to the hoisting support point and the transportation support point. One end of the third reinforcement 3 is fixed to the first intersection 10, and the other end is connected to the lower chord 102. The connection point of the third reinforcement 3 and the lower chord 102 coincides with the connection point of the second reinforcement 2 and the lower chord 102.
[0068] During the transportation phase, the lower chord 102 of the steel truss segment is supported, while the complete web member 101 is compressed. When the upper equivalent center of gravity is located to the right of the plumb line of the second intersection point 11, the first reinforcement member 1 is under tension, and the second reinforcement member 2 and the third reinforcement member 3 are under compression and do not participate in the load-bearing. When the upper equivalent center of gravity is located to the left of the plumb line of the second intersection point 11, the second reinforcement member 2 and the third reinforcement member 3 are under tension, and the first reinforcement member 1 does not participate in the load-bearing.
[0069] During the hoisting phase, the upper chord 100 of the steel truss segment is suspended, and the complete web member 101 is under tension. When the lower equivalent center of gravity is located to the right of the plumb line of the first intersection point 10, the second reinforcement member 2 and the third reinforcement member 3 are under tension, and the first reinforcement member 1 is either under auxiliary tension or does not participate in the load. When the upper equivalent center of gravity is located to the left of the plumb line of the first intersection point 10, the first reinforcement member 1 is under tension, and the second reinforcement member 2 and the third reinforcement member 3 are either under auxiliary tension or do not participate in the load.
[0070] Based on the above analysis, a stress analysis was conducted to determine the material, cross-section, and stress-free length of the first reinforcement 1, the second reinforcement 2, and the third reinforcement 3.
[0071] like Figure 4 and Figure 5 In the second embodiment, according to the second segmentation scheme of the triangular truss formed by the steel truss segments, the middle segment is diagonally segmented, and the double-sided reinforcement scheme is selected as shown in the figure, which corresponds to S42.
[0072] Similarly, according to the tie rod design, a first reinforcement 1, a second reinforcement 2, and a third reinforcement 3 are added. The connection points at both ends of the first reinforcement 1 and the second reinforcement 2 are adjacent to the hoisting support point and the transportation support point. One end of the third reinforcement 3 is fixed to the first intersection 10, and the other end is connected to the lower chord 102.
[0073] During the transportation phase, the lower chord 102 of the steel truss segment is supported, while the complete web member 101 is compressed. When the upper equivalent center of gravity is located to the right of the plumb line of the second intersection point 11, the first reinforcement member 1 is under tension, and the second reinforcement member 2 and the third reinforcement member 3 are under compression and do not participate in the load-bearing. When the upper equivalent center of gravity is located to the left of the plumb line of the second intersection point 11, the second reinforcement member 2 and the third reinforcement member 3 are under tension, and the first reinforcement member 1 does not participate in the load-bearing.
[0074] During the hoisting phase, the upper chord 100 of the steel truss segment is suspended, and the complete web member 101 is under tension. When the lower equivalent center of gravity is located to the right of the plumb line of the first intersection point 10, the second reinforcement member 2 and the third reinforcement member 3 are under tension; when the upper equivalent center of gravity is located to the left of the plumb line of the first intersection point 10, the first reinforcement member 1 is under tension.
[0075] Based on the above analysis, a stress analysis was conducted to determine the material, cross-section, and stress-free length of the first reinforcement 1, the second reinforcement 2, and the third reinforcement 3.
[0076] like Figure 6 and Figure 7 In the third embodiment, according to the third segmentation scheme of the triangular truss formed by the steel truss segments, the side is diagonally segmented, and a single-sided reinforcement scheme is selected as shown in the figure, which corresponds to S41.
[0077] A second reinforcement member 2 is added according to the tie rod design, and a third reinforcement member 3 is added according to the tension-compression rod design. The connection points at both ends of the second reinforcement member 2 are adjacent to the hoisting support point and the transportation support point. One end of the third reinforcement member 3 is fixed to the second intersection point 11, and the other end is connected to the upper chord 100.
[0078] During the transportation phase, the lower chord 102 of the steel truss segment is supported, while the complete web member 101 is compressed. When the upper equivalent center of gravity is located to the right of the plumb line of the second intersection 11, the third reinforcement 3 is compressed, and the first reinforcement 1 does not need to participate in the force. When the upper equivalent center of gravity is located to the left of the plumb line of the second intersection 11, both the second reinforcement 2 and the third reinforcement 3 are in tension.
[0079] During the hoisting phase, the upper chord 100 of the steel truss girder segment is suspended, the complete web member 101 is under tension, the lower equivalent center of gravity is located to the right of the plumb line of the first intersection 10, and the second reinforcement 2 and the third reinforcement 3 are both under tension.
[0080] Based on the above analysis, a stress analysis was conducted to determine the material, cross-section, and stress-free length of the first reinforcement 1, the second reinforcement 2, and the third reinforcement 3.
[0081] like Figure 8 and Figure 9 In the fourth embodiment, based on a segmentation scheme of the N-shaped truss formed by the steel truss segments, the middle vertical segment is selected, and a double-sided reinforcement scheme is adopted as shown in the figure, which corresponds to S42.
[0082] The upper and lower equivalent centers of gravity are located exactly on the center line of the complete web member 101. A first reinforcement member 1 and a second reinforcement member 2 are added according to the tie rod design. The connection points at both ends of the first reinforcement member 1 and the second reinforcement member 2 are adjacent to the hoisting support point and the transportation support point.
[0083] During the transportation phase, the lower chord 102 of the steel truss segment is supported, the complete web member 101 is compressed, and the first reinforcement member 1 and the second reinforcement member 2 do not participate in the stress.
[0084] During the hoisting phase, the upper chord 100 of the steel truss segment is suspended, the complete web member 101 is under tension, and the first reinforcement member 1 and the second reinforcement member 2 are under tension.
[0085] Based on the above analysis, a stress analysis was performed to determine the material, cross-section, and stress-free length of the first reinforcement 1 and the second reinforcement 2.
[0086] The temporary reinforcement method for steel truss segments in this application considers the segmentation and stress conditions (including gravity distribution characteristics) of the steel truss segments. It selects either a double-sided or single-sided reinforcement scheme and, when adding reinforcement components, primarily uses flexible and lightweight components to construct an efficient vertical load transfer path. This rationalizes the stress under different equilibrium states during the construction stage of the steel truss segments. The temporary reinforcement method in this application avoids blindly reinforcing the steel truss segments, fully utilizes the bearing capacity of the permanent components (including the complete web members 101) of the steel truss segments, and can significantly improve the economy of reinforcement measures.
[0087] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.
[0088] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0089] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.
Claims
1. A method of temporary reinforcement of a steel truss girder segment, characterized by, Includes the following steps: S1. Determine the support points for the steel truss girder segments during the construction phase; S2. Assess the stress condition of the steel truss segments during the construction phase and determine whether reinforcement of the steel truss segments is required. If the stress and deformation of the steel truss segments meet the design requirements, no reinforcement is required, and proceed to step S7. If either the stress or deformation of the steel truss segments does not meet the design requirements, proceed to step S3. S3. Based on the segmentation of the steel truss, select either a double-sided reinforcement scheme or a single-sided reinforcement scheme. If a single-sided reinforcement scheme is selected, proceed to step S41; if a double-sided reinforcement scheme is selected, proceed to step S42. S41. Add a first reinforcement (1) or a second reinforcement (2) according to the design of the tie rod, and add a third reinforcement (3) according to the design of the tension and compression rod, and determine the material, cross section and stress-free length of each reinforcement; S42. Add a first reinforcement (1) and a second reinforcement (2) according to the design of the tie rod, or add a first reinforcement (1), a second reinforcement (2) and a third reinforcement (3) according to the design of the tie rod, and determine the material, cross section and stress-free length of each reinforcement; S5. Assess the stress condition of the reinforced steel truss segment during the construction phase, and determine whether the stress and deformation of the steel truss segment and each reinforcement component meet the design requirements; if yes, proceed to step S7; if no, proceed to step S6. S6. Adjust the cross-sectional area and / or stress-free length of the reinforcement, and then proceed to step S5; S7. End of design; In steps S41 and S42, the reinforcement designed as a tie rod uses steel wire rope, chain hoist or steel tie rod, and the reinforcement designed as a tension / compression rod uses welded I-beam.
2. The temporary reinforcement method for a steel truss segment as described in claim 1, characterized in that, The construction phase described in step S1 includes a transportation phase and a hoisting phase. The support points for the steel truss girder segments to be constructed in the proposed construction phase include: Determine the transport support points at the bottom of the steel truss girder segment and the hoisting support points at the top of the steel truss girder segment.
3. The temporary reinforcement method for a steel truss segment as described in claim 1, characterized in that, In steps S41 and S42, each of the reinforcing members is arranged in two or more sets in the transverse direction of the steel truss segment, and the reinforcing members correspond to the upper and lower chords of the steel truss segment in the transverse direction, or the reinforcing members correspond to the ends of the crossbeams near the chords in the transverse direction.
4. The temporary reinforcement method for a steel truss segment as described in claim 2, characterized in that: The steel truss segment includes an upper chord (100), a complete web member (101), a lower chord (102), a first web member to be connected (103), and a second web member to be connected (104). During the transportation phase, the combined structure of the upper chord (100), the complete web member (101), the first web member to be connected (103), and the second web member to be connected (104) has an upper equivalent center of gravity. During the hoisting phase, the combined structure of the lower chord (102), the complete web member (101), the first web member to be connected (103), and the second web member to be connected (104) has a lower equivalent center of gravity. In step S42, when the first reinforcement (1) and the second reinforcement (2) are added according to the tie rod design, the first reinforcement (1) and the second reinforcement (2) are located on both sides of the longitudinal direction of the complete web member (101) of the steel truss segment; or when the first reinforcement (1), the second reinforcement (2) and the third reinforcement (3) are added according to the tie rod design, the first reinforcement (1) and the second reinforcement (2) are located on both sides of the longitudinal direction of the complete web member (101) of the steel truss segment, and the third reinforcement (3) and the upper equivalent center of gravity are located on both sides of the longitudinal direction of the complete web member (101); In steps S41 and S42, the connection positions of the ends of the first reinforcement member (1) and the second reinforcement member (2) with the upper chord (100) and the lower chord (102) are adjacent to the transport support point and the hoisting support point.
5. The temporary reinforcement method for a steel truss segment as described in claim 4, characterized in that: In step S41, the steel truss segment is provided with a third reinforcement member (3) and a first reinforcement member (1) or a second reinforcement member (2). The two ends of the two reinforcement members are respectively connected to the upper chord (100) and the lower chord (102). The two reinforcement members and the complete web member (101) are located on the longitudinal sides of the upper equivalent center of gravity.