Hybrid continuous steel truss girder structure and method of installing same

Abstract

This application relates to a hybrid continuous steel truss girder structure and its installation method, belonging to the technical field of steel truss girder bridges. It includes web members and a lower chord. The hybrid continuous steel truss girder structure comprises a steel-concrete lower chord segment located within a predetermined length. The steel-concrete lower chord segment includes steel gusset plates, a steel truss, and a concrete structure. The steel gusset plates are arranged in pairs at the lower chord nodes. The top of the steel gusset plate is used to connect to the web members, and the bottom protrudes downward relative to the lower chord members outside the steel-concrete lower chord segment. The steel truss is arranged along the longitudinal direction of the bridge and is fixed between multiple pairs of steel gusset plates. The concrete structure surrounds the steel truss and the multiple pairs of steel gusset plates and is cast in place. The hybrid continuous steel truss girder structure and its installation method of this application solve the problems of poor economy, low ballast efficiency, and difficult maintenance after ballasting in existing conventional continuous steel truss girder bridge solutions for eliminating negative reactions at the edge supports. It also reduces costs and solves the problem of low beam end rotational stiffness in railway continuous steel truss girder bridges.

Description

Technical Field

[0001] This invention relates to the field of steel truss bridge technology, specifically to a hybrid continuous steel truss structure and its installation method. Background Technology

[0002] Currently, conventional continuous steel truss bridges are beam structures with strong spanning capacity. When the ratio of the side span to the middle span is small, negative reaction forces will appear at the side supports.

[0003] In related technologies, two technical solutions are generally adopted to solve the problem of negative reaction force. The first solution is to increase the side span and the ratio of side to middle span, thereby eliminating the negative reaction force. The second solution is to apply pressure near the side support point, thereby eliminating the negative reaction force.

[0004] However, increasing the side spans would significantly increase the project cost and make it uneconomical. Applying counterweights between the bottom and top surfaces of the steel truss bridge body would also increase the length of the counterweights and reduce their efficiency due to the limited thickness of the steel truss bridge body. Furthermore, the counterweight structure would occupy the internal maintenance space of the bridge body, making maintenance during operation difficult.

[0005] In addition, for railway continuous steel truss bridges, strict requirements are placed on the beam end rotation angle to ensure smooth train operation. However, the rotation stiffness of the beam ends of conventional continuous steel truss bridges is relatively low, making it difficult to meet the beam end rotation angle requirements of railway continuous steel truss bridges. Therefore, it is often necessary to carry out specific reinforcement on the end truss members and bridge deck of railway continuous steel truss bridges. However, such design greatly increases the amount of steel used and the cost of the bridge. Summary of the Invention

[0006] This application provides a hybrid continuous steel truss structure and its installation method, which solves the problems of poor economy, low ballast efficiency and difficult maintenance after ballasting in existing schemes for eliminating negative reaction forces at the side supports of conventional continuous steel truss bridges. It can also reduce costs and solve the problem of low rotational stiffness at the beam ends of railway continuous steel truss bridges.

[0007] In a first aspect, embodiments of this application provide a hybrid continuous steel truss structure, including web members and a lower chord, wherein the hybrid continuous steel truss structure includes a steel-concrete lower chord segment for serving as a side support load, and the steel-concrete lower chord segment is located within a set length of the side span and adjacent to the side support.

[0008] The steel-concrete lower chord section includes steel node plates, steel trusses, and concrete structures. The steel node plates are arranged in pairs at the lower chord nodes. The steel node plates are arranged along the longitudinal direction of the bridge, and there is a transverse bridge spacing between the two steel node plates in each pair. The top of the steel node plate is used to connect the web members, and the bottom protrudes downward relative to the lower chord members outside the steel-concrete lower chord section.

[0009] The steel truss is arranged along the longitudinal direction of the bridge and is fixed between multiple pairs of steel node plates. The concrete structure surrounds the steel truss and multiple pairs of steel node plates and is cast in place.

[0010] In conjunction with the first aspect, in one embodiment, the steel truss includes a steel truss top chord, a steel truss bottom chord, and steel truss web members. The steel truss top chord and the steel truss bottom chord are both connected to multiple steel node plates along the longitudinal direction of the bridge. The steel truss top chord and the steel truss bottom chord are arranged vertically at intervals at the bottom of the steel node plates. Outside the steel node plates, the steel truss web members are inclinedly arranged between the steel truss top chord and the steel truss bottom chord.

[0011] In conjunction with the first aspect, in one embodiment, the upper chord and the lower chord of the steel truss are both arranged in pairs, and the steel truss includes two horizontally connected steel trusses that are spaced apart vertically and arranged longitudinally. The horizontally connected steel trusses are horizontally supported and fixed between a pair of upper chords and a pair of lower chords.

[0012] In conjunction with the first aspect, in one embodiment, a hybrid joint is provided on the longitudinal bridge side end face of the steel-concrete lower chord segment away from the side support point, the hybrid joint includes a pressure plate, and the pressure plate is provided with a plurality of prestressed tendon fixing points;

[0013] The hybrid continuous steel truss structure also includes several longitudinal prestressed tendons, which are perpendicular to the bearing plate. The two ends of the longitudinal prestressed tendons are respectively connected to the prestressed tendon fixing point and the end of the side support point of the bearing plate. The ends of the lower chord members outside the steel-concrete lower chord section and the ends of the adjacent bridge deck stiffening ribs are welded to the bearing plate.

[0014] In conjunction with the first aspect, in one embodiment, the hybrid joint is located between two lower chord nodes.

[0015] In conjunction with the first aspect, in one embodiment, each pair of steel node plates is vertically fitted with a number of shear studs and has a number of pre-reserved reinforcing bar holes, which are used to pass through the transverse reinforcing bars of the concrete structure.

[0016] In conjunction with the first aspect, in one embodiment, each of the steel node plates has a plurality of protrusions on its top, and the plurality of protrusions are connected one by one to an equal number of web members.

[0017] Secondly, this application provides an installation method for the above-mentioned hybrid continuous steel truss structure, comprising the following steps:

[0018] Install the steel node plates and steel trusses for the upper chord, web members, and steel-concrete lower chord;

[0019] Install the reinforcing bars, stress tendons, and formwork for the lower chord of the reinforced concrete structure;

[0020] Pouring concrete to form a concrete structure;

[0021] Demolding, tensioning stress tendons, forming the steel-concrete lower chord section.

[0022] In conjunction with the second aspect, in one embodiment, the steel truss includes a top chord, a bottom chord, and web members; installing the steel truss includes:

[0023] The upper chord and lower chord of the steel truss are connected to multiple steel node plates along the longitudinal direction of the bridge. The upper chord and lower chord of the steel truss connect multiple steel node plates that are spaced apart along the longitudinal direction of the bridge. The upper chord and lower chord of the steel truss are spaced apart at the bottom of the steel node plates.

[0024] Outside the steel node plate, the web members of the steel truss are inclinedly set between the upper chord and the lower chord of the steel truss.

[0025] In conjunction with the second aspect, in one embodiment, the upper chord and lower chord of the steel truss are both arranged in pairs. The two upper chords of the pair of steel truss upper chords are spaced apart along the transverse direction on the inner side of the steel node plate, and the two lower chords of the pair of steel truss lower chords are also spaced apart along the transverse direction on the inner side of the steel node plate. The upper chord and lower chord of the steel truss are arranged vertically spaced apart.

[0026] The installation steel truss also includes:

[0027] The horizontal bracing of the steel truss is fixed between a pair of upper chords of the steel truss and between a pair of lower chords of the steel truss.

[0028] The beneficial effects of the technical solutions provided in this application include at least the following:

[0029] The hybrid continuous steel truss structure of this application differs from traditional continuous steel truss structures by featuring a unique steel-concrete lower chord section. In this section, the bottom of the steel node plate protrudes downward relative to the lower chord members outside the steel-concrete lower chord section. Multiple pairs of steel node plates are then connected longitudinally along the bridge by a steel truss, and a concrete structure is poured to surround the steel truss and the multiple pairs of steel node plates. This hybrid continuous steel truss structure utilizes the large self-weight of the concrete structure to eliminate the negative reaction force at the edge supports, replacing counterweight materials and reducing the amount of steel used, thus significantly reducing the structural cost. Meanwhile, the entire steel-concrete lower chord section adopts a combination of steel and concrete structures, resulting in high ballast efficiency. This solves the problems of poor economy, low ballast efficiency, and difficult maintenance after ballasting in existing schemes for eliminating negative reactions at the edge supports of conventional continuous steel truss bridges. Furthermore, the hybrid continuous steel truss structure of this application can also be used in railway continuous steel truss bridges, significantly improving beam end rotational stiffness and reducing beam end rotation angle. Compared to conventional designs that specifically strengthen the end truss members and bridge deck of railway continuous steel truss bridges, the hybrid continuous steel truss structure of this application reduces costs and solves the problem of low beam end rotational stiffness in railway continuous steel truss bridges.

[0030] The hybrid continuous steel truss structure of this application uses steel trusses for positioning and fixing steel gusset plates, ensuring the connection accuracy between the steel gusset plates and the web members. Before concrete pouring, a stable structure capable of withstanding certain loads is formed. The steel trusses also limit cracks caused by later concrete shrinkage and creep, making the structure safer and more reliable. Attached Figure Description

[0031] 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.

[0032] Figure 1 Elevation view of the bridge structure provided in the embodiments of this application;

[0033] Figure 2 for Figure 1 AA section view in the middle;

[0034] Figure 3 for Figure 1 BB section view in the middle;

[0035] Figure 4 for Figure 3 CC section view in the middle;

[0036] Figure 5 for Figure 2 DD section view in the middle;

[0037] In the diagram: 101, top chord; 102, web member; 103, bottom chord; 104, side support point;

[0038] 1. Steel gusset plate; 2. Steel truss; 21. Upper chord of steel truss; 22. Lower chord of steel truss; 23. Web member of steel truss; 24. Horizontal bracing of steel truss; 3. Hybrid joint; 31. Bearing plate; 32. Longitudinal prestressed tendon; 4. Steel-concrete lower chord; 41. Concrete structure. Detailed Implementation

[0039] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0040] This application provides a hybrid continuous steel truss structure and its installation method, which solves the problems of poor economy, low ballast efficiency and difficult maintenance after ballasting in existing solutions for eliminating negative reaction forces at the side supports.

[0041] like Figures 1 to 5 As shown, this application discloses an embodiment of a hybrid continuous steel truss structure. The continuous steel truss structure includes an upper chord 101, a web member 102, and a lower chord 103. The connection form of the upper chord 101, web member 102, and lower chord 103 is consistent with conventional schemes. The upper chord 101, web member 102, and lower chord 103 are all made of steel structural members.

[0042] The web member 102 and the upper chord member 101 have multiple upper chord nodes, and the web member 102 and the lower chord member 103 have multiple lower chord nodes.

[0043] The hybrid continuous steel truss structure has two end spans and a middle span, and the middle span can have multiple spans.

[0044] The hybrid continuous steel truss structure of this application includes a steel-concrete lower chord segment 4, which acts as a heavy load on the side support 104 to eliminate the negative reaction force of the side support 104.

[0045] The reinforced concrete lower chord segment 4 is located within a predetermined length of the side span and adjacent to the side support 104. The reinforced concrete lower chord segment 4 protrudes downward relative to the lower chord member 103 of the steel structure, occupying space downwards but not occupying the maintenance space of the bridge structure. Specifically, the predetermined length is based on the principle that it will not generate negative reaction force under operating conditions.

[0046] The reinforced concrete lower chord section 4 includes steel node plates 1, steel trusses 2, and concrete structure 41. The steel node plates 1 are arranged in pairs at the lower chord nodes, along the longitudinal direction of the bridge, with a transverse bridge spacing between the two steel node plates 1 in each pair. Multiple pairs of steel node plates 1 form two transversely spaced longitudinal vertical planes. The top of the steel node plates 1 is used to connect to the web members 102, and the bottom protrudes downward relative to the lower chord members 103 outside the reinforced concrete lower chord section 4.

[0047] The steel truss 2 is set along the longitudinal direction of the bridge and is fixed between multiple pairs of steel node plates 1. The concrete structure 41 is formed by casting around the steel truss 2 and multiple pairs of steel node plates 1.

[0048] The hybrid continuous steel truss structure of this application differs from traditional continuous steel truss structures by featuring a unique steel-concrete lower chord section 4. The bottom of the steel node plate 1 in the steel-concrete lower chord section 4 protrudes downward relative to the lower chord members 103 outside the steel-concrete lower chord section 4. Multiple pairs of steel node plates 1 are then connected along the longitudinal direction of the bridge by a steel truss 2. Finally, a concrete structure 41 is poured to surround the steel truss 2 and the multiple pairs of steel node plates 1. The hybrid continuous steel truss structure of this application utilizes the large self-weight of the concrete structure 41 to eliminate the negative reaction force at the edge supports, replacing the counterweight material and reducing the amount of steel used, which can significantly reduce the structural cost. Meanwhile, the entire steel-concrete lower chord section 4 adopts a combination of steel and concrete structures, resulting in high ballast efficiency. This solves the problems of poor economy, low ballast efficiency, and difficult maintenance after ballasting in existing schemes for eliminating negative reactions at the edge supports of conventional continuous steel truss bridges. Furthermore, the hybrid continuous steel truss structure of this application can also be used in railway continuous steel truss bridges, significantly improving beam end rotational stiffness and reducing beam end rotation angle. Compared to conventional designs that specifically strengthen the end truss members and bridge deck of railway continuous steel truss bridges, the hybrid continuous steel truss structure of this application reduces costs and solves the problem of low beam end rotational stiffness in railway continuous steel truss bridges.

[0049] In one embodiment, the steel truss 2 includes a top chord 21, a bottom chord 22, and web members 23. Both the top chord 21 and the bottom chord 22 connect multiple steel node plates 1 along the longitudinal direction of the bridge. The top chord 21 and the bottom chord 22 connect the multiple steel node plates 1 spaced apart along the longitudinal direction of the bridge. The top chord 21 and the bottom chord 22 are fixed vertically and vertically at intervals to the bottom of the steel node plates 1.

[0050] Outside of the steel node plate 1, the web members 23 of the steel truss are inclinedly arranged between the upper chord 21 and the lower chord 22 of the steel truss.

[0051] Preferably, the upper chord 21, the lower chord 22, and the steel node plate 1 of the steel truss are connected by high-strength bolts.

[0052] Furthermore, the upper chord 21 and lower chord 22 of the steel truss are both arranged in pairs. The two upper chords 21 of the pair of steel truss upper chords 21 are arranged at intervals along the transverse direction on the inner side of the steel node plate 1. Similarly, the two lower chords 22 of the pair of steel truss lower chords 22 are also arranged at intervals along the transverse direction on the inner side of the steel node plate 1. The upper chords 21 and lower chords 22 of the steel truss are arranged vertically at intervals.

[0053] The steel truss 2 includes two vertically spaced steel truss horizontal bracing 24 arranged longitudinally. The steel truss horizontal bracing 24 is horizontally supported and fixed between a pair of upper chord members 21 of the steel truss and between a pair of lower chord members 22 of the steel truss.

[0054] The upper chord 21, lower chord 22, horizontal bracing 24, and web members 23 of the steel truss form a stable steel structure for the steel truss 2.

[0055] The hybrid continuous steel truss structure of this application uses steel truss 2 for positioning and fixing steel node plate 1 to ensure the connection accuracy between steel node plate 1 and web member 102; before pouring concrete, a stable structure capable of withstanding a certain load is formed; steel truss 2 can also limit cracks caused by later concrete shrinkage and creep, making the structure safer and more reliable.

[0056] like Figure 2 and Figure 5 As shown, in one embodiment, a hybrid joint 3 is provided on the longitudinal bridge side end face of the steel-concrete lower chord segment 4 away from the side support point 104. The hybrid joint 3 includes a pressure plate 31, and the pressure plate 31 is provided with several prestressed tendon fixing points.

[0057] The hybrid continuous steel truss structure also includes several longitudinal prestressed tendons 32, which are perpendicular to the bearing plate 31. The two ends of the longitudinal prestressed tendons are respectively connected to the prestressed tendon fixing point and the end of the side support 104 of the bearing plate 31. The ends of the lower chord members 103 outside the steel-concrete lower chord section 4 and the ends of the adjacent bridge deck stiffening ribs are welded to the bearing plate 31.

[0058] Specifically, the longitudinal prestressed tendons 32 not only ensure that the joint surfaces do not separate, but also eliminate the tensile stress borne by the concrete structure 41, making the transition position safe and reliable.

[0059] Preferably, the hybrid joint 3 is located between two lower chord nodes. Specifically, the hybrid joint 3 is located between a lower chord node inside a reinforced concrete lower chord segment 4 and a lower chord node outside the reinforced concrete lower chord segment 4. The hybrid joint 3 avoids the lower chord nodes, making the connection more stable.

[0060] In one embodiment, each pair of steel gusset plates 1 is vertically perforated with several shear studs and pre-drilled holes for reinforcing bars, which are used to pass through the transverse reinforcing bars of the concrete structure 41. Each transverse reinforcing bar passes through both steel gusset plates 1 of a pair. The transverse reinforcing bars and shear studs further enhance the stability of the steel and concrete structures.

[0061] Specifically, each steel node plate 1 has several protrusions at its top, and each of the protrusions is connected to an equal number of web members 102.

[0062] This application discloses an installation method for the above-mentioned hybrid continuous steel truss structure, comprising the following steps:

[0063] Install the upper chord 101, web member 102, and steel node plate 1 and steel truss 2 for the steel-concrete lower chord section 4;

[0064] Install the reinforcing bars, stress tendons, and formwork for the lower chord section 4 of the steel-concrete composite structure;

[0065] Pour concrete to form a concrete structure 41;

[0066] Demolding, tensioning stress tendons, forming the steel-concrete lower chord segment 4.

[0067] Regarding the installation method, in one embodiment, the steel truss 2 includes a steel truss upper chord 21, a steel truss lower chord 22, and a steel truss web member 23. Both the upper chord 21 and the lower chord 22 are connected to multiple steel node plates 1 along the longitudinal direction of the bridge. The upper chord 21 and the lower chord 22 connect the multiple steel node plates 1 spaced apart along the longitudinal direction. The upper chord 21 and the lower chord 22 are fixed vertically and vertically at intervals to the bottom of the steel node plates 1. Outside the steel node plates 1, the steel truss web member 23 is inclinedly arranged between the upper chord 21 and the lower chord 22. Preferably, the upper chord 21, the lower chord 22, and the steel node plates 1 are connected by high-strength bolts.

[0068] The installed steel truss 2 includes:

[0069] The upper chord 21 and the lower chord 22 of the steel truss are connected to multiple steel node plates 1 along the longitudinal direction of the bridge. The upper chord 21 and the lower chord 22 of the steel truss are arranged at intervals at the bottom of the steel node plates 1.

[0070] Outside of the steel node plate 1, the web members 23 of the steel truss are inclinedly arranged between the upper chord 21 and the lower chord 22 of the steel truss.

[0071] Regarding the installation method, in one embodiment, the upper chord 21 and lower chord 22 of the steel truss are both arranged in pairs. The two upper chords 21 of the pair of steel truss upper chords 21 are arranged at intervals along the transverse direction on the inner side of the steel node plate 1. Similarly, the two lower chords 22 of the pair of steel truss lower chords 22 are also arranged at intervals along the transverse direction on the inner side of the steel node plate 1. The upper chords 21 and lower chords 22 of the steel truss are arranged vertically at intervals.

[0072] The steel truss 2 includes two vertically spaced steel truss horizontal bracing 24 arranged longitudinally. The steel truss horizontal bracing 24 is horizontally supported and fixed between a pair of upper chord members 21 of the steel truss and between a pair of lower chord members 22 of the steel truss.

[0073] The upper chord 21, lower chord 22, horizontal bracing 24, and web members 23 of the steel truss 2 form a stable steel structure. The installation of the steel truss 2 also includes:

[0074] The horizontal bracing 24 of the steel truss is fixed between a pair of upper chord members 21 of the steel truss and between a pair of lower chord members 22 of the steel truss.

[0075] In one embodiment, a hybrid joint 3 is provided on the longitudinal bridge side end face of the steel-concrete lower chord segment 4 away from the side support 104. The hybrid joint 3 includes a bearing plate 31, and the bearing plate 31 is provided with several prestressed tendon fixing points.

[0076] The hybrid continuous steel truss structure also includes several longitudinal prestressed tendons 32, which are perpendicular to the bearing plate 31. The two ends of the longitudinal prestressed tendons are respectively connected to the prestressed tendon fixing point and the end of the side support 104 of the bearing plate 31. The ends of the lower chord members 103 outside the steel-concrete lower chord section 4 and the ends of the adjacent bridge deck stiffening ribs are welded to the bearing plate 31.

[0077] Specifically, the longitudinal prestressed tendons 32 not only ensure that the joint surfaces do not separate, but also eliminate the tensile stress borne by the concrete structure 41, making the transition position safe and reliable.

[0078] Preferably, the hybrid joint 3 is located between two lower chord nodes. Specifically, the hybrid joint 3 is located between a lower chord node of a reinforced concrete lower chord segment 4 and a lower chord node outside the reinforced concrete lower chord segment 4. The hybrid joint 3 avoids the lower chord nodes, making the connection more stable.

[0079] 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.

[0080] 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.

[0081] 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 hybrid continuous steel truss structure, comprising web members (102) and a bottom chord (103), characterized in that: The hybrid continuous steel truss structure includes a steel-concrete lower chord segment (4) that serves as a load-bearing element for the side support (104), the steel-concrete lower chord segment (4) being located within a predetermined length of the side span and adjacent to the side support (104); The steel-concrete lower chord section (4) includes steel node plates (1), steel trusses (2) and concrete structures (41). The steel node plates (1) are arranged in pairs at the lower chord nodes. The steel node plates (1) are arranged along the longitudinal direction of the bridge, and there is a transverse bridge spacing between the two steel node plates (1) of each pair. The top of the steel node plate (1) is used to connect the web members (102), and the bottom protrudes downward relative to the lower chord members (103) outside the steel-concrete lower chord section (4). The steel truss (2) is set along the longitudinal direction of the bridge and is fixed between multiple pairs of steel node plates (1). The concrete structure (41) surrounds the steel truss (2) and multiple pairs of steel node plates (1) and is cast in shape.

2. The hybrid continuous steel truss structure as described in claim 1, characterized in that: The steel truss (2) includes a steel truss upper chord (21), a steel truss lower chord (22), and a steel truss web member (23). The steel truss upper chord (21) and the steel truss lower chord (22) are connected to multiple steel node plates (1) along the longitudinal direction of the bridge. The steel truss upper chord (21) and the steel truss lower chord (22) are arranged vertically at intervals at the bottom of the steel node plates (1). Outside the steel node plates (1), the steel truss web member (23) is inclinedly arranged between the steel truss upper chord (21) and the steel truss lower chord (22).

3. A hybrid continuous steel truss structure as described in claim 2, characterized in that: The upper chord (21) and lower chord (22) of the steel truss are both arranged in pairs. The steel truss (2) includes two steel truss horizontal bracing (24) that are spaced apart vertically and arranged longitudinally. The steel truss horizontal bracing (24) is horizontally supported and fixed between a pair of upper chords (21) and a pair of lower chords (22).

4. A hybrid continuous steel truss structure as described in claim 1, characterized in that: The steel-concrete lower chord section (4) is provided with a hybrid joint (3) on the longitudinal bridge side end face away from the side support (104). The hybrid joint (3) includes a pressure plate (31) and the pressure plate (31) is provided with several prestressed tendon fixing points. The hybrid continuous steel truss structure also includes several longitudinal prestressed tendons (32), which are perpendicular to the bearing plate (31). The two ends of the longitudinal prestressed tendons (32) are respectively connected to the prestressed tendon fixing point and the end of the side support (104) of the bearing plate (31). The ends of the lower chord members (103) outside the steel-concrete lower chord section (4) and the ends of the adjacent bridge deck stiffening ribs are welded to the bearing plate (31).

5. A hybrid continuous steel truss structure as described in claim 4, characterized in that: The hybrid joint (3) is located between the two lower chord nodes.

6. A hybrid continuous steel truss structure as described in claim 1, characterized in that: Each pair of steel node plates (1) is vertically fitted with several shear studs and has several reserved reinforcing bar holes, which are used to pass through the transverse reinforcing bars of the concrete structure (41).

7. A hybrid continuous steel truss structure as described in claim 1, characterized in that: Each of the steel node plates (1) has a number of protrusions at its top, and the number of protrusions are connected one by one to an equal number of web members (102).

8. An installation method for a hybrid continuous steel truss structure as described in claim 1, comprising the following steps: Install the steel node plate (1) and steel truss (2) for the upper chord (101), web members (102) and steel-concrete lower chord (4); Install the reinforcing bars, stress tendons and formwork for the steel-concrete lower chord section (4); Pour concrete to form a concrete structure (41); Demolding, tensioning stress tendons, forming the steel-concrete lower chord segment (4).

9. The installation method as described in claim 8, characterized in that, The steel truss (2) includes a steel truss upper chord (21), a steel truss lower chord (22), and a steel truss web member (23). Installing the steel truss (2) includes: The upper chord (21) and lower chord (22) of the steel truss are connected to multiple steel node plates (1) along the longitudinal direction of the bridge. The upper chord (21) and lower chord (22) of the steel truss connect the multiple steel node plates (1) that are spaced apart along the longitudinal direction of the bridge. The upper chord (21) and lower chord (22) of the steel truss are spaced apart at the bottom of the steel node plates (1). Outside the steel node plate (1), the web members (23) of the steel truss are inclinedly arranged between the upper chord (21) and the lower chord (22) of the steel truss.

10. The installation method as described in claim 9, characterized in that, The upper chord (21) and lower chord (22) of the steel truss are both set in pairs. The two upper chords (21) of the pair of steel truss upper chords (21) are set at intervals along the transverse direction on the inner side of the steel node plate (1). The two lower chords (22) of the pair of steel truss lower chords (22) are also set at intervals along the transverse direction on the inner side of the steel node plate (1). The upper chords (21) and lower chords (22) of the steel truss are set at intervals above and below. The installed steel truss (2) also includes: The horizontal bracing (24) of the steel truss is fixed between a pair of upper chords (21) of the steel truss and between a pair of lower chords (22) of the steel truss.

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