A hollow area structure for a concrete hollow continuous rigid frame bridge

Abstract

The present invention discloses a hollow region structure for a concrete hollow continuous rigid frame bridge, comprising an upper chord section and a lower chord section. The upper chord section is arranged horizontally, and the lower chord section is located below the upper chord section. The lower chord section is an arc-shaped structure that arches toward the upper chord section. The lower chord section is arranged obliquely and forms an integral box girder at the junction with the upper chord section. The upper chord section comprises a top plate and an upper chord web, with at least one upper chord web vertically connected below the top plate. The lower chord section comprises a bottom plate and a lower chord web, with the same number of lower chord webs as the upper chord webs, corresponding to the upper chord webs vertically connected above the bottom plate. The upper and lower chord webs are connected at the junction by an arc transition to form an integral structure. The present invention has a simple structure, smooth construction and stress transition, economical cost, convenient construction, and good durability.

Description

Technical Field

[0001] The invention belongs to the technical field of concrete hollow type continuous rigid frame bridge structures, and in particular relates to a hollow area structure used for a concrete hollow type continuous rigid frame bridge. Background Art

[0002] The concrete hollow-web continuous rigid frame bridge, also known as the arch-beam combined continuous rigid frame bridge, is a novel modification of the conventional continuous rigid frame. Its key concept is to increase the height of the box girder at its base and hollow out the web at its base to reduce deadweight, creating a beam-arch combined mechanical effect. This improves structural load-bearing efficiency and enhances the bridge's span capacity. Hollow-web continuous rigid frame bridges share the balanced cantilever construction characteristics of conventional continuous rigid frame bridges, with the advantages of reduced operating and maintenance costs and low construction costs. Their economic span ranges from 220 to 400 meters, potentially bridging the gap between the applicable spans of conventional continuous rigid frame bridges and cable-stayed bridges. As of 2024, approximately ten large-span hollow-web continuous rigid frame bridges have been built or are under construction for highways, railways, urban roads, and rail transit applications, demonstrating significant technical and economic advantages and broad application prospects.

[0003] Concrete hollow-core continuous rigid-frame bridges offer numerous advantages, including relatively light weight, large spans, and aesthetically pleasing appearance. However, in practice, they still face several drawbacks: ① Construction of the upper and lower chord sections in the hollow region is challenging; ② The junction structure is complex, resulting in uneven stress distribution and uneven transitions, making construction difficult and increasing the risk of cracking; and ③ The construction efficiency of the upper and lower chords is low, leading to long construction periods. These factors hinder the widespread application of hollow-core continuous rigid-frame bridge structures. Summary of the Invention

[0004] The object of the present invention is to provide a hollow area structure for a concrete hollow continuous rigid frame bridge which has the advantages of simple structure, smooth construction and stress transition, economical cost, convenient construction and good durability.

[0005] To achieve the above-mentioned object, the present invention provides a hollow area structure for a concrete hollow continuous rigid frame bridge, comprising a shaped upper chord beam segment, a shaped lower chord beam segment, a junction node of the upper and lower chord beam segments, and a connecting column provided between the shaped upper chord beam segment and the shaped lower chord beam segment;

[0006] The upper chord section is composed of an upper chord top plate and at least two upper chord webs, the upper chord top plate is connected to the upper chord webs, and a chamfer transition is provided at the connection;

[0007] The lower chord section is composed of a lower chord bottom plate and at least two lower chord webs, the lower chord bottom plate is connected to the lower chord webs, and a chamfer transition is provided at the connection;

[0008] At least one set of cover plates is connected to the top surface of the lower chord web of the shaped lower chord beam section;

[0009] The number of upper chord webs is the same as that of lower chord webs, and the outer side, inner side or transverse position of the centerline of the upper chord webs and lower chord webs correspond to each other one by one;

[0010] The upper chord beam section and the lower chord beam section are connected at the junction through the upper and lower chord junction nodes to form an integral box beam section, and the upper chord web and the lower chord web are connected one by one through arc transition;

[0011] At least one vertical connecting column is provided between the upper chord beam section and the lower chord beam section. The upper chord beam section is provided with an upper chord transverse diaphragm at the connection of the connecting column, and the lower chord beam section is provided with a lower chord transverse diaphragm at the connection of the connecting column.

[0012] As a further solution of the present invention, the geometric dimensions of the bottom chord base plate and the bottom chord web plate need to meet the compressive stability control requirements expressed by the following formula:

[0013] ;

[0014] Among them, E c is the elastic modulus of concrete material, f ck is the standard compressive strength of concrete material, b2 is the spacing of the bottom chord web, t b is the thickness of the bottom chord plate, h2 and t2 are the height and thickness of the bottom chord web respectively;

[0015] The dimensional relationship between the spacing b1 of the upper chord web at the connection with the upper and lower chord confluence node, the spacing b2 of the lower chord web at the connection with the upper and lower chord confluence node 3, and the spacing b3 of the web at the upper and lower chord confluence node is: b1=b2=b3;

[0016] The dimensional relationship between the thickness t1 of the upper chord web at the connection with the upper and lower chord confluence node, the thickness t2 of the lower chord web at the connection with the upper and lower chord confluence node 3, and the thickness t3 of the web at the upper and lower chord confluence node is: t1=t2=t3.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The upper and lower chord web structures greatly simplify the construction of the upper and lower chord beam sections, making construction easier.

[0019] 2. The webs of the upper and lower chords correspond to each other one by one. The upper and lower chord webs are connected by an arc transition at the junction to form a whole. The structural structure and stress transition are smooth, which improves the stress state of the junction of the upper and lower chord beam sections, reduces the risk of cracking, and improves the durability of the structure.

[0020] 3. The setting of connecting columns can reduce the local stress of the upper chord beam section under the action of vehicle loads, which can make the length range of the hollow area larger, and make the hollow continuous rigid frame bridge have a larger spanning capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of the hollow region structure of a concrete hollow continuous rigid frame bridge according to the present invention;

[0022] Figure 2 for Figure 1 Schematic diagram of the cross-section structure of the middle and upper chord beam section;

[0023] Figure 3 for Figure 1 Schematic diagram of the cross-section structure of the middle and lower chord beam sections;

[0024] Figure 4 for Figure 1 Schematic diagram of the cross-section structure of the integral box girder;

[0025] Figure 5 It is a schematic elevation view of the hollow area structure of the concrete hollow continuous rigid frame bridge according to the present invention.

[0026] In the figure: 1, shaped upper chord beam section, 2, shaped lower chord beam section, 3, upper and lower chord junction, 4, upper chord top plate, 5, upper chord web plate, 6, lower chord bottom plate, 7, lower chord web plate, 8, arc transition, 9, connecting column, 10, upper chord transverse diaphragm, 11, lower chord transverse diaphragm, 12, cover plate. DETAILED DESCRIPTION

[0027] The present invention will be further described below by way of examples.

[0028] like Figure 1 and Figure 5 As shown, a hollow area structure for a concrete hollow continuous rigid frame bridge includes a shaped upper chord beam segment 1, a shaped lower chord beam segment 2, an upper and lower chord junction node 3, and a connecting column 9 provided between the shaped upper chord beam segment 1 and the shaped lower chord beam segment 2;

[0029] As a preferred solution, the upper chord beam section 1 and the lower chord beam section 2 are made of high-performance concrete material, and the strength grade of the concrete material is not less than C50;

[0030] As a preferred solution, the upper and lower chord confluence node 3 is made of concrete material, and the strength grade of the concrete material is not lower than the strength grade of the upper chord beam section 1 and the lower chord beam section 2; the concrete of the upper and lower chord confluence node 3 is mixed with fiber to improve the tensile and crack resistance;

[0031] The upper chord beam section 1 is composed of an upper chord top plate 4 and at least two upper chord webs 5. The upper chord top plate 4 is connected to the upper chord webs 5, and a chamfered transition is provided at the connection;

[0032] The lower chord beam section 2 is composed of a lower chord bottom plate 6 and at least two lower chord webs 7. The lower chord bottom plate 6 is connected to the lower chord webs 7, and a chamfered transition is provided at the connection;

[0033] At least one set of cover plates 12 is connected to the top surface of the lower chord web 7 of the lower chord beam section 2, and is preferably arranged at intervals according to the torsional stiffness requirements of the lower chord beam section 2;

[0034] As a preferred solution, the cover plate 12 on the top surface of the lower chord web 7 can be cast in situ or prefabricated and installed;

[0035] The number of the upper chord webs 5 and the lower chord webs 7 is the same, and the outer sides or inner sides or transverse positions of the upper chord webs 5 and the lower chord webs 7 correspond to each other in one-to-one relationship, preferably in one-to-one relationship in the transverse positions of the center lines;

[0036] The upper chord beam section 1 and the lower chord beam section 2 are connected at the junction through the upper and lower chord junction node 3 to form an integral box beam section. The upper chord web 5 and the lower chord web 7 are connected one by one through the arc transition 8.

[0037] At least one vertical connecting column 9 is provided between the upper chord beam section 1 and the lower chord beam section 2. The upper chord beam section 1 is provided with an upper chord transverse diaphragm 10 at the connection of the connecting column 9, and the lower chord beam section 2 is provided with a lower chord transverse diaphragm 11 at the connection of the connecting column 9.

[0038] Further, such as Figures 2 to 4 As shown, the geometric dimensions of the lower chord bottom plate 6 and the lower chord web 7 need to meet the compressive stability control requirements expressed by the following formula:

[0039] ;

[0040] Among them, E c is the elastic modulus of concrete material, f ck is the standard compressive strength of concrete material, b2 is the spacing of the lower chord web 7, t b is the thickness of the bottom chord plate 6, h2 and t2 are the height and thickness of the bottom chord web 7 respectively;

[0041] The dimensional relationship between the spacing b1 of the upper chord web 5 at the connection with the upper and lower chord confluence node 3, the spacing b2 of the lower chord web 7 at the connection with the upper and lower chord confluence node 3, and the spacing b3 of the webs at the upper and lower chord confluence node 3 is: b1=b2=b3;

[0042] The dimensional relationship among the thickness t1 of the upper chord web 5 connected to the upper and lower chord confluence nodes 3, the thickness t2 of the lower chord web 7 connected to the upper and lower chord confluence nodes 3, and the thickness t3 of the web of the upper and lower chord confluence nodes 3 is: t1=t2=t3.

Claims

1. A hollow area structure for a concrete hollow continuous rigid frame bridge, characterized in that: It comprises a shaped upper chord beam section (1), a shaped lower chord beam section (2), an upper and lower chord junction node (3), and a connecting column (9) provided between the shaped upper chord beam section (1) and the shaped lower chord beam section (2); The upper chord beam section (1) is composed of an upper chord top plate (4) and at least two upper chord web plates (5), the upper chord top plate (4) is connected to the upper chord web plates (5), and a chamfered transition is provided at the connection; The lower chord beam section (2) is composed of a lower chord bottom plate (6) and at least two lower chord webs (7), the lower chord bottom plate (6) is connected to the lower chord webs (7), and a chamfered transition is provided at the connection; The top surface of the lower chord web (7) of the shaped lower chord beam section (2) is connected to at least one set of cover plates (12); The number of the upper chord webs (5) and the lower chord webs (7) is the same, and the outer sides, inner sides or transverse positions of the upper chord webs (5) and the lower chord webs (7) correspond to each other; The upper chord beam section (1) and the lower chord beam section (2) are connected at the junction through the upper and lower chord junction nodes (3) to form an integral box beam section, and the upper chord web (5) and the lower chord web (7) are connected one by one through the arc transition (8); At least one vertical connecting column (9) is provided between the upper chord beam section (1) and the lower chord beam section (2); the upper chord beam section (1) is provided with an upper chord transverse diaphragm (10) at the connection with the connecting column (9); and the lower chord beam section (2) is provided with a lower chord transverse diaphragm (11) at the connection with the connecting column (9).

2. The hollow area structure for a concrete hollow continuous rigid frame bridge according to claim 1, characterized in that: The geometric dimensions of the lower chord base plate (6) and the lower chord web plate (7) need to meet the compressive stability control requirements expressed by the following formula: ； Among them, E c is the elastic modulus of concrete material, f ck is the standard compressive strength of concrete material, b2 is the spacing of the lower chord web (7), t b is the thickness of the bottom chord plate (6), h2 and t2 are the height and thickness of the bottom chord web plate (7) respectively; The dimensional relationship between the spacing b1 of the upper chord web (5) at the connection with the upper and lower chord confluence nodes (3), the spacing b2 of the lower chord web (7) at the connection with the upper and lower chord confluence nodes (3), and the spacing b3 of the web at the upper and lower chord confluence nodes (3) is: b1=b2=b3; The dimensional relationship between the thickness t1 of the upper chord web (5) at the connection with the upper and lower chord confluence node (3), the thickness t2 of the lower chord web (7) at the connection with the upper and lower chord confluence node (3), and the thickness t3 of the web at the upper and lower chord confluence node (3) is: t1=t2=t3.

Images