Combined truss type steel arch rib section

Abstract

The utility model relates to a combined truss type steel arch rib section which is an arch rib structure applied to a through type arch bridge, and the arch rib section comprises a transverse dumbbell-shaped chord member section; each transverse dumbbell-shaped chord member section comprises two full-length top plates, two full-length bottom plates, two full-length web plates and two inner-layer transverse plates, and the upper transverse dumbbell-shaped chord member section and the lower transverse dumbbell-shaped chord member section are connected through vertical web members and inclined web members; and the transverse dumbbell-shaped chord members are transversely connected in a reinforced manner through the pi-shaped connecting plates. Compared with the prior art, the utility model has the advantages of smooth stress transmission route, reliable stress and convenience in design and construction.

Description

Technical Field

[0001] The utility model relates to the field of bridge engineering, and in particular to a combined truss type steel arch rib section. Background Technique

[0002] The combined truss arch bridge is composed of a solid web arch and a truss structure system, and has the force characteristics of both the truss and the solid web arch. Each member of the truss part mainly bears axial force and has the force characteristics of a common truss. The force characteristics of the solid web arch: under the action of the dead load, it mainly bears axial pressure; under the action of the live load, it will bear bending moment and become an eccentric compression member. The truss arch combines the favorable factors of the truss and the arch rib, and mainly bears axial force. At the same time, the combination of the truss and the arch rib can give full play to the role of the materials of the entire cross-section. Compared with the beam bridge of the same span, it has strong integrity, saves materials, has a small self-weight, and has good adaptability to soft soil foundations.

[0003] The main chord members of traditional truss arch bridges adopt circular tube sections or open steel sections. The circular tube section adopts the form of filling concrete inside to improve the compressive performance of the cross-section, and can give full play to the performance of the two materials. The disadvantage is that the quality of the concrete inside the steel tube directly affects the stress state of the arch rib. Therefore, the construction quality requirements for the concrete inside the steel tube are very high. At the same time, the intersecting line welding between steel tubes also has relatively high construction requirements and has a greater impact on fatigue performance. The open section members are slender and have poor integrity, which puts relatively high requirements on both construction and transportation. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the defects of poor integrity and great influence by construction existing in the above-mentioned prior art, and to provide a combined truss type steel arch rib section with good integrity, large stiffness, good compressive performance, simple structure, high safety, and little influence by construction.

[0005] The purpose of the utility model can be realized by the following technical solutions:

[0006] The utility model provides a combined truss type steel arch rib section, which is an arch rib structure applied to a middle and lower bearing type arch bridge. The arch rib section includes a transverse dumbbell-shaped chord member section.

[0007] The transverse dumbbell-shaped chord member section includes: two long top plates, bottom plates, webs, and inner layer transverse plates. The upper transverse dumbbell-shaped chord member section and the lower transverse dumbbell-shaped chord member section are connected by vertical web members and diagonal web members; the transverse dumbbell-shaped chord members are strengthened by π-shaped connecting plates for transverse connection. The outer contour dimensions of the steel arch section are unified for the entire arch rib.

[0008] Furthermore, stiffening plates are arranged between two parallel vertical web members and two parallel diagonal web members respectively to strengthen the local stiffness.

[0009] Furthermore, the connection position between the suspension rod and the cross-section of the transverse dumbbell-shaped chord is the suspension point. At the suspension point, the inner plate of the vertical web member and the inner web plate of the dumbbell-shaped chord box are combined into one integral plate and extend out of the arch rib chamber to form the suspension rod ear plate.

[0010] Furthermore, the inner plate of the vertical web member and the inner web plate of the dumbbell-shaped chord box are combined into one integral plate and extend out of the arch rib chamber to form the suspension rod ear plate. It not only undertakes part of the function of the web but also is the main structure of the suspension rod ear plate, avoiding the complex structure of the suspension rod box and simplifying the structure.

[0011] Furthermore, the full length of the arch rib has the same height and width, including the transition section from the crown section to the springing section. The thickness of each plate is determined according to the stress requirements.

[0012] Furthermore, the standard spacing of the arch rib segments is determined according to the overall layout of the bridge and the stress requirements.

[0013] Furthermore, the left and right dumbbell boxes of the transverse dumbbell-shaped chord are locally strengthened by U-shaped diaphragms, and the U-shaped diaphragms are arranged at the positions corresponding to the π-shaped connecting plates.

[0014] Furthermore, the vertical web member is composed of three plate members, namely, the inner plate of the vertical web member, the outer plate of the vertical web member, and the inner and outer connecting plates of the vertical web member, which are welded together. At the position of the suspension rod, the inner plate of the vertical web member is replaced by the suspension rod ear plate.

[0015] Furthermore, the I-shaped diagonal web member is composed of three plate members, namely, the inner plate of the diagonal web member, the outer plate of the diagonal web member, and the inner and outer connecting plates of the diagonal web member, which are welded together.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] (1) Good integrity, high stiffness, and good compressive performance: The utility model utilizes the dumbbell-shaped chord with good integrity and high stiffness. The force transmission from the crown to the springing is adapted by different plate thicknesses, without the need to pour concrete to improve the compressive performance of the cross-section, nor to increase the cross-sectional performance by enlarging the overall cross-sectional size of the arch rib. The entire cross-section of the arch rib has the same height and width. By adjusting the different plate thicknesses of the top and bottom plates and the web of the dumbbell-shaped chord cross-section, it adapts to the stress requirements from the crown to the springing. The combined use of small-sized plate members avoids waste of materials and increases the permeability of the cross-section.

[0018] (2) Simple structure and high safety: The utility model utilizes the inner abdominal wall of the dumbbell-shaped chord, which extends to the outside of the arch rib and combines with the design of the suspension rod ear plate, avoiding the separate setting of the suspension rod box, resulting in intertwined components and a more complex structure; the integrated design enhances the safety of the structure.

[0019] (3) Little influence from construction: The combined truss type steel arch rib section of the present utility model has a coherent and beautiful appearance, reasonable and reliable force, and at the same time solves technical problems for design and construction, and has strong applicability in medium and large arch bridges. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall layout of the arch bridge in Embodiment 1;

[0021] Figure 2 It is a schematic elevation view of the standard section;

[0022] Figure 3 It is a side view of the arch rib section ( Figure 5 A-A in);

[0023] Figure 4 It is a sectional view of the arch rib section ( Figure 5 B-B in);

[0024] Figure 5 It is a standard sectional view ( Figure 4 C-C in);

[0025] Figure 6 It is a sectional view at the position of the non-hanging point web member ( Figure 4 D-D in);

[0026] Figure 7 It is a sectional view at the position of the suspender ( Figure 4 E-E in).

[0027] Figure 8 It is a standard sectional view of the vertical web member (5) and the inclined web member (6)

[0028] Reference numerals: 1 - top plate, 2 - bottom plate, 3 - web member, 4 - inner layer transverse plate, 5a - inner side plate of the vertical web member, 5b - outer side plate of the vertical web member, 5c - inner and outer connecting plate of the vertical web member, 5 - vertical web member, 6a - inner side plate of the inclined web member, 6b - outer side plate of the inclined web member, 6c - inner and outer connecting plate of the inclined web member, 6 - inclined web member, 7 - π-shaped connecting plate, 7a - U-shaped diaphragm, 8 - suspender ear plate, 9 - stiffening plate, 10 - suspender, 11 - truss type arch rib, 12 - solid web type arch leg, A - transverse dumbbell-shaped chord section. Detailed Embodiment

[0029] The present utility model will be described in detail below in conjunction with the drawings and specific embodiments. Features such as component models, material names, connection structures, control methods, algorithms, etc. that are not clearly described in this technical solution are regarded as common technical features disclosed in the prior art.

[0030] Embodiment 1

[0031] This embodiment provides a combined truss type steel arch rib section, asFigure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown in Figure 6 , it is an arch rib structure applied to a mid-lower bearing arch bridge. The arch rib section includes a transverse dumbbell-shaped chord section A;

[0032] The transverse dumbbell-shaped chord section A includes: two full-length top plates 1, bottom plates 2, webs 3, and inner transverse plates 4. The upper transverse dumbbell-shaped chord section A and the lower transverse dumbbell-shaped chord section A are connected by vertical web members 5 and diagonal web members 6; the transverse dumbbell-shaped chords are transversely strengthened by π-shaped connecting plates 7. The outer contour dimensions of the steel arch section are unified for the entire arch rib.

[0033] In the specific implementation, stiffening plates 9 are arranged between the two parallel vertical web members 5 and the two parallel diagonal web members 6 to locally strengthen the stiffness.

[0034] As Figure 7 , Figure 8 shown in Figure 8 , in the specific implementation, the connection position between the suspender 10 and the transverse dumbbell-shaped chord section A is the suspension point position. At the suspension point position, a suspender ear plate 8 is formed by extending through the inner side plate 5a of the vertical web member and the web 3 and out of the arch rib chamber. One flange plate of the web 3 and the inner side plate 5a of the vertical web member extends out of the arch rib chamber to form the suspender ear plate 8. It not only bears part of the function of the web but also is the main structure of the suspender ear plate 8, avoiding the complex suspender box structure and simplifying the structure.

[0035] In the specific implementation, the entire length of the arch rib has the same height and width, including the transition section from the crown section to the springing section. The thickness of each plate is determined according to the force requirements.

[0036] In the specific implementation, the vertical web member 5 is welded by three plate members: the inner side plate 5a of the vertical web member, the outer side plate 5b of the vertical web member, and the inner and outer connecting plates 5c of the vertical web member. At the position of the suspender 10, the inner side plate 5a of the vertical web member is replaced by the suspender ear plate 8.

[0037] In the specific implementation, the I-shaped diagonal web member 6 is welded by three plate members: the inner side plate 6a of the diagonal web member, the outer side plate 6b of the diagonal web member, and the inner and outer connecting plates 6c of the diagonal web member.

[0038] As Figure 2 shown in Figure 2 , in the specific implementation, the standard segment spacing of the arch rib is 7.5 m.

[0039] In the specific implementation, the left and right dumbbell boxes of the transverse dumbbell-shaped chord are locally strengthened by U-shaped transverse diaphragms 7a, and the U-shaped transverse diaphragms 7a are arranged at positions corresponding to the π-shaped connecting plates 7.

[0040] In the specific embodiment, the arch bridge is a three-span half-through tied arch bridge. The projected span of the middle arch rib is 157.8 m, the width of the arch rib is 2 m, and the height is 3.8 m. The height and width of the upper and lower chord members are both 0.6 m.

[0041] In the specific embodiment, the thickness of each part of the chord member plate is adjusted in segments from 35 mm at the crown of the truss arch rib 11 to 45 mm at the position of the solid web arch leg 12, and the thickness of other connecting plates is the standard plate thickness.

[0042] In the specific embodiment, the projected span of the side arch rib is 79.8 m, the width of the side arch rib is 2 m, and the height is 3.5 m. The dimensions of the upper and lower chord members are the same as those of the middle arch rib, which are 0.6 m × 0.6 m. The design principle of the plate thickness is the same as that of the middle arch rib, and it varies from 24 mm to 30 mm in segments.

[0043] The components not described in detail in this embodiment are all existing components that can be purchased through public channels.

[0044] The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and use the utility model. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present utility model is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present utility model according to the disclosure of the present utility model should be within the protection scope of the present utility model.

Claims

1. A combined truss steel arch rib section, characterized in that: It is an arch rib structure used in mid-through arch bridges. The arch rib section includes a transverse dumbbell-shaped chord section (A); The transverse dumbbell-shaped chord section (A) comprises: a top plate (1), a bottom plate (2), a web plate (3), and an inner transverse plate (4); the upper transverse dumbbell-shaped chord section (A) and the lower transverse dumbbell-shaped chord section (A) are connected via a vertical web member (5) and an oblique web member (6); the transverse dumbbell-shaped chord is strengthened in transverse connection via a π-shaped connecting plate (7).

2. A combined truss steel arch rib section according to claim 1, characterized in that: Stiffening plates (9) are arranged between two parallel vertical web members (5) and two parallel oblique web members (6) to enhance local rigidity.

3. The combined truss steel arch rib section according to claim 1, characterized in that: The connection position of the suspension rod (10) and the transverse dumbbell-shaped chord section (A) is the suspension point position. At the suspension point position, the vertical web inner plate (5a) and the web plate (3) on the inner side of the dumbbell-shaped chord box are combined into a whole plate and extend out of the arch rib box chamber to form a suspension rod ear plate (8).

4. A combined truss steel arch rib section according to claim 3, characterized in that: The inner side plate (5a) of the vertical web member and the web plate (3) on the inner side of the dumbbell-shaped chord box are combined into a whole plate and extend out of the arch rib box chamber to form a suspension rod ear plate (8).

5. The combined truss steel arch rib section according to claim 1, characterized in that: The arch rib has equal height and width over its entire length, including the transition section from the arch top section to the arch bottom section.

6. The combined truss steel arch rib section according to claim 1, characterized in that: The left and right dumbbell boxes of the transverse dumbbell-shaped chord rod are partially reinforced by using U-shaped transverse partitions (7a), and the U-shaped transverse partitions (7a) are arranged at positions corresponding to the π-shaped connecting plates (7).

7. The combined truss steel arch rib section according to claim 1, characterized in that: The vertical web member (5) is formed by welding three plates, namely, a vertical web member inner plate (5a), a vertical web member outer plate (5b), and a vertical web member inner and outer connecting plate (5c). At the position of the suspension rod (10), the vertical web member inner plate (5a) is replaced by a suspension rod ear plate (8).

8. The combined truss steel arch rib section according to claim 1, characterized in that: The I-shaped oblique web member (6) is formed by welding three plates, namely, an oblique web member inner plate (6a), an oblique web member outer plate (6b), and an oblique web member inner and outer connecting plates (6c).

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