Internal bolt assembly for a steel tube concrete arch bridge joint arch rib

By setting an array of shear studs in a ring on the inner wall of the upper and lower chords of the arch rib, the strength weakening problem caused by the conflict of longitudinal prestressed steel strands in the arch rib structure was solved, and the stability and strength of the structure were improved.

CN224943003UActive Publication Date: 2026-11-06SHANDONG TRAFFIC PLANNING DESIGN INST +2
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Patent Information

Application Number
CN202620009961.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2026-01-06
Publication Date
2026-11-06
Estimated Expiration
2036-01-06

AI Technical Summary

Technical Problem

The arch rib structure of a multi-span, under-deck steel-concrete composite arch bridge is weakened due to the conflict between the longitudinal prestressed steel strands in the beam and the arch rib.

Method used

A ring array of shear studs is installed on the inner wall of the upper and lower chords of the arch rib, corresponding to the connection area of ​​the web members and the parallel bracing. The included angle is 30° to 40°, the diameter is 22mm to 24mm, the length is 2m to 2.2m, and the number is 8 to 10. They are welded to the inner wall of the upper and lower chords to enhance the bond between the steel pipe and the concrete.

Benefits of technology

It effectively enhances the strength of the arch rib structure, simplifies reinforcement measures, reduces costs, and improves the stability of the structure through the array design of shear studs.

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Abstract

This utility model discloses an internal stud assembly for the arch rib of a steel-concrete composite arch bridge. The arch rib includes two parallel upper chords, two parallel lower chords, and several web member assemblies. The web member assemblies are used to connect the upper and lower chords. Each web member assembly includes vertically arranged straight web members and inclined web members. The two upper chords and the two lower chords are horizontally connected in the corresponding connection areas of the web member assemblies by parallel bracing. Shear studs are provided on the inner walls of the upper and lower chords in the common areas corresponding to the connection areas of the web member assemblies and parallel bracing. The shear studs are arranged in a ring array. This utility model has the characteristics of low cost, simple operation, and significantly enhanced arch rib structural strength.
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Description

Technical Field

[0001] This utility model belongs to the technical field of steel-concrete composite joint construction, specifically relating to an internal stud assembly for the arch rib of a steel-concrete composite arch bridge joint. Background Technology

[0002] In multi-span, under-deck steel-concrete composite arch bridges, the connection between the arch rib and the tie beam at the arch foot is mainly that the arch rib is directly inserted into the tie beam. However, due to the large number of longitudinal prestressed steel strands in the tie beam, the longitudinal prestressed steel strands conflict with the arch rib, resulting in a weakening of the arch rib structure strength. Utility Model Content

[0003] The present invention aims to provide an internal stud assembly for the arch rib of a steel-concrete composite arch bridge node, which enhances the structural strength of the arch rib and solves the problem of the conflict between the longitudinal prestressed steel strands in the tie beam and the arch rib, resulting in a weakening of the arch rib structural strength.

[0004] Therefore, the technical solution adopted by this utility model is as follows: an internal stud assembly for the arch rib of a steel-concrete composite arch bridge node. The arch rib includes two upper chords arranged side by side, two lower chords arranged side by side, and several web member assemblies. The web member assemblies are used to connect the upper chords and lower chords. The web member assemblies include vertically arranged straight web members and inclined web members. The two upper chords and the two lower chords are horizontally connected by parallel bracing in the corresponding connection areas of the web member assemblies. Shear studs are provided in the common connection areas of the upper chords and lower chords corresponding to the web member assemblies and parallel bracing, and the shear studs are arranged in a ring array.

[0005] As a preferred embodiment of the above scheme, the included angle between adjacent shear studs in the circumferential direction is 30° to 40° to ensure the number of shear studs and guarantee the stability of the reinforced structure.

[0006] More preferably, the diameter φ of the shear stud is 22mm to 24mm, which is a reasonable size.

[0007] More preferably, the shear stud array area has a length of 2m to 2.2m, which is a reasonable length and includes the area where the upper chord, lower chord, web members, and horizontal couplings intersect.

[0008] Further preferably, the connection point between the flat brace and the upper and lower chords is located at the center of the shear stud array area to ensure structural stability.

[0009] A further preferred embodiment is that the number of shear studs is 8 to 10, which is a reasonable number and ensures structural strength.

[0010] More preferably, the shear studs are welded to the inner walls of the upper chord and the lower chord, ensuring a stable connection.

[0011] The beneficial effects of this utility model are as follows: Compared with the weakening of the arch rib structure strength due to the longitudinal prestressed steel strands in the beam, this solution uses shear studs arranged in a ring array in the common area of ​​the connection between the web members and the parallel bracing on the inner wall of the upper chord and the inner wall of the lower chord. This effectively strengthens the bond between the steel pipe and the concrete, and enhances the strength of the arch rib structure. Compared with other complex strengthening measures, simply adding array-type shear studs is low in cost, simple to operate, novel in concept, and ingenious in design. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 for Figure 1 A schematic diagram of the structure in the direction of the arrow. Detailed Implementation

[0014] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0015] Combination Figure 1 — Figure 2 As shown, an internal stud assembly for the arch rib of a steel-concrete composite arch bridge node is provided. The arch rib consists of two upper chords 1 arranged side by side, two lower chords 2 arranged side by side, and several web member assemblies 3.

[0016] The web member assembly 3 is used to connect the upper chord 1 and the lower chord 2.

[0017] The web member assembly 3 consists of a vertically arranged straight web member 31 and an inclined web member 32.

[0018] The two upper chord members 1 and the two lower chord members 2 are horizontally connected in the corresponding connection area of ​​the web member assembly 3 by the horizontal bracing 4.

[0019] Shear studs 5 are provided in the common area where the inner walls of the upper chord 1 and the lower chord 2 connect to the web member assembly 3 and the parallel bracing 4.

[0020] The shear studs 5 are arranged in a ring array.

[0021] The included angle between adjacent circumferential shear studs is preferably 30° to 40°.

[0022] The diameter φ of the shear stud 5 is preferably 22mm to 24mm.

[0023] The preferred length of the shear stud array area is 2m to 2.2m.

[0024] The number of rings in the shear stud is preferably 8 to 10.

[0025] Shear studs 5 are welded to the inner wall of the upper chord 1 and the inner wall of the lower chord 2.

[0026] The connection point between the horizontal bracing 4 and the upper chord 1 and lower chord 2 is located at the center of the shear stud 5 array area.

[0027] In multi-span, under-deck steel-concrete composite arch bridges, the connection between the arch ribs and the tie beams at the arch foot is mainly that the arch ribs are directly inserted into the tie beams.

[0028] However, due to the large number of longitudinal prestressed steel strands in the tie beam, the longitudinal prestressed steel strands conflict with the arch rib, resulting in a weakening of the arch rib structure strength.

[0029] The web member assembly 3 and the horizontal bracing 4 are welded together on the corresponding upper chord 1 and lower chord 2. The inner walls of the upper chord and lower chord are welded with shear studs in the common area connecting the web member assembly and the horizontal bracing.

[0030] When the arch rib is inserted into the arch foot, the concrete directly enters the pipes of the upper chord 1 and lower chord 2, and includes the shear studs, thereby effectively strengthening the bond between the steel pipe and the concrete and enhancing the structural strength of the arch rib.

Claims

1. An internal stud assembly for an arch rib of a steel-concrete composite arch bridge node, the arch rib comprising two parallel upper chords (1), two parallel lower chords (2), and several web member assemblies (3), wherein the web member assemblies (3) are used to connect the upper chords (1) and the lower chords (2), and the web member assemblies (3) include vertically arranged straight web members (31) and inclined web members (32), wherein the two upper chords (1) and the two lower chords (2) are horizontally connected in the corresponding connection areas of the web member assemblies (3) by horizontal bracing (4), characterized in that: The inner wall of the upper chord (1) and the inner wall of the lower chord (2) are provided with shear studs (5) in the common area connecting the web member assembly (3) and the parallel link (4), and the shear studs (5) are arranged in a ring array.

2. The inner stud assembly for a joint rib of a concrete-filled steel tube arch bridge according to claim 1, wherein: The included angle between adjacent shear studs in the circumferential direction is 30° to 40°.

3. The inner stud assembly for a node arch rib of a CFST arch bridge according to claim 1, wherein: The diameter φ of the shear stud (5) is 22mm to 24mm.

4. The inner stud assembly for a node arch rib of a CFST arch bridge according to claim 1, wherein: The length of the shear nail (5) array area is 2m to 2.2m.

5. The internal stud assembly for the arch rib of a steel-concrete composite arch bridge node according to claim 1, characterized in that: The connection point between the flat brace (4) and the upper chord (1) and lower chord (2) is located at the center of the shear stud (5) array area.

6. The inner tendon assembly for a joint rib of a concrete-filled steel tube arch bridge according to claim 1, wherein: The shear stud (5) has 8 to 10 rings.

7. The inner tendon assembly for a jointed arch rib of a concrete-filled steel tubular arch bridge according to claim 1, wherein: The shear studs (5) are welded to the inner wall of the upper chord (1) and the inner wall of the lower chord (2).