Vierendeel area structure for concrete vierendeel type continuous rigid frame bridge

Abstract

The invention discloses an open-web area structure for a concrete open-web continuous rigid frame bridge, which comprises an upper chord beam section and a lower chord beam section, the upper chord beam section is horizontally arranged, the lower chord beam section is positioned below the upper chord beam section, and the lower chord beam section is of an arc-shaped structure arched towards the upper chord beam section; the lower chord beam section is obliquely arranged and forms an integral box beam with a convergence node of the upper chord beam section; the upper chord beam section comprises a top plate and at least one upper chord web which is vertically connected below the top plate; the lower chord beam section comprises a bottom plate and lower chord webs, the number of the lower chord webs is the same as that of the upper chord webs, the upper chord webs are vertically connected to the upper portion of the bottom plate correspondingly, and the upper chord webs and the lower chord webs are connected into a whole at a convergence node through arc transition. The structure is simple, construction and stress transition are smooth, the manufacturing cost is low, construction is convenient, and durability is good.

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-type continuous rigid frame bridge, also known as the arch-beam combined continuous rigid frame bridge, is a new modification of the conventional continuous rigid frame. Its main idea is to increase the height of the root of the box girder and hollow out the web at the root of the box girder to reduce the deadweight and form a beam-arch combined mechanical effect, thereby improving the structural load-bearing efficiency and enhancing the bridge's spanning capacity. The hollow-type continuous rigid frame bridge has the advantages of balanced cantilever construction similar to the conventional continuous rigid frame bridge, low operation and maintenance costs, and low engineering cost. Its economic span is 220m to 400m, and it is expected to fill the gap between the applicable span of conventional continuous rigid frame bridges and the applicable span of cable-stayed bridges. As of 2024, there are about 10 large-span hollow-type continuous rigid frame bridges for highways, railways, urban roads, rail transit, etc. that have been built or are under construction, reflecting significant technical and economic advantages and broad application prospects.

[0003] Concrete hollow continuous rigid frame bridge has many advantages such as relatively light weight, large span capacity, beautiful appearance, etc., but in practical application, there are still some shortcomings: ① The construction of the upper and lower chord beam sections in the hollow area is difficult; ② The junction node structure is complex, the stress distribution is uneven, the transition is not smooth, the construction is difficult and the risk of cracking is high; ③ The construction efficiency of the upper and lower chords is low and the construction period is long. These factors also restrict the promotion and application of hollow continuous rigid frame bridge structure. Summary of the invention

[0004] The purpose of the present invention is to provide a hollow area structure for a concrete hollow type 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 object, the present invention provides a hollow area structure for a concrete hollow continuous rigid frame bridge, comprising a Π-shaped upper chord beam section, The Π-shaped lower chord beam section, the upper and lower chord confluence node and the Π-shaped upper chord beam section and A connecting column is provided between the lower chord beam sections;

[0006] The Π-shaped upper chord beam section is composed of an upper chord top plate and at least two upper chord web plates, the upper chord top plate is connected to the upper chord web plates, and a chamfer transition is provided at the connection;

[0007] The lower chord beam section is composed of a lower chord bottom plate and at least two lower chord web plates, the lower chord bottom plate is connected to the lower chord web plate, 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 lateral positions of the upper chord webs, inner sides or center lines of the lower chord webs correspond one to one;

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

[0011] Π-shaped upper chord section and At least one vertical connecting column is provided between the Π-shaped lower chord beam sections, and an upper chord transverse diaphragm is provided at the connection between the connecting columns of the Π-shaped upper chord beam sections. A lower chord cross diaphragm is provided at the connection point of the connecting column in the lower chord beam section.

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

[0013]

[0014]

[0015] 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, t b is the thickness of the bottom plate of the lower chord, h2 and t2 are the height and thickness of the web of the lower chord respectively;

[0016] The dimensional relationship between the spacing b1 of the web of the upper chord at the junction of the upper and lower chords, the spacing b2 of the web of the lower chord, and the spacing b3 of the web of the junction of the upper and lower chords is: b1 = b2 = b3;

[0017] The dimensional relationship between the thickness t1 of the upper chord web connected to the upper and lower chord confluence node, the thickness t2 of the lower chord web and the thickness t3 of the web at the upper and lower chord confluence node is: t1=t2=t3.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The upper chord web and lower chord web structures greatly simplify the construction of the upper chord beam section and the lower chord beam section, making construction easier;

[0020] 2. The webs of the upper chord and the lower chord correspond to each other. The webs of the upper chord and the lower chord are connected at the junction through an arc transition 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;

[0021] 3. The setting of connecting columns can reduce the local stress of the upper chord beam section under the action of vehicle load, which can make the length range of the hollow area larger, so that the hollow continuous rigid frame bridge has a larger spanning capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the hollow area structure of the concrete hollow type continuous rigid frame bridge of the present invention;

[0023] Figure 2 for Figure 1 Schematic diagram of the cross-section structure of the middle and upper chord beam section;

[0024] Figure 3 for Figure 1 Schematic diagram of the cross-section structure of the middle and lower chord beam sections;

[0025] Figure 4 for Figure 1 Schematic diagram of the cross-section structure of the integral box girder;

[0026] Figure 5 It is a schematic elevation view of the hollow area structure of the concrete hollow type continuous rigid frame bridge according to the present invention.

[0027] In the figure: 1. Π-shaped upper chord beam section, 2. shaped lower chord beam section, 3. upper and lower chord junction node, 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 diaphragm, 11. lower chord diaphragm, 12. cover plate. DETAILED DESCRIPTION

[0028] The present invention will be further described below by way of examples.

[0029] like Figure 1 and Figure 5 As shown, a hollow area structure for a concrete hollow continuous rigid frame bridge comprises a Π-shaped upper chord beam segment 1, The Π-shaped lower chord beam segment 2, the upper and lower chord confluence node 3 and the Π-shaped upper chord beam segment 1 and A connecting column 9 is provided between the lower chord beam sections 2;

[0030] As a preferred solution, the Π-shaped upper chord beam segment 1 and The lower chord beam section 2 is made of high-performance concrete material, and the strength grade of the concrete material is not less than C50;

[0031] 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 that of the Π-shaped upper chord beam segment 1 and the The strength grade of the lower chord beam section 2 is formed; the concrete at the upper and lower chord junction 3 is mixed with fibers to improve the tensile and crack resistance;

[0032] The Π-shaped 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 chamfer transition is provided at the connection;

[0033] The lower chord beam section 2 is composed of a lower chord bottom plate 6 and at least two lower chord web plates 7. The lower chord bottom plate 6 is connected to the lower chord web plates 7, and a chamfer transition is provided at the connection;

[0034] At least one set of cover plates 12 is connected to the top surface of the lower chord web plate 7 of the lower chord beam section 2, and is preferably arranged at intervals according to the torsional rigidity requirements of the lower chord beam section 2;

[0035] 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;

[0036] The number of the upper chord webs 5 and the lower chord webs 7 is the same, and the lateral positions of the upper chord webs 5 and the lower chord webs 7 on the outer side or the inner side or the center line correspond one to one, preferably the lateral positions of the center line correspond one to one;

[0037] Π-shaped upper chord beam segment 1 and The lower chord beam section 2 is connected at the confluence through the upper and lower chord confluence node 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;

[0038] Π-shaped upper chord beam segment 1 and At least one vertical connecting column 9 is provided between the Π-shaped lower chord beam sections 2, and an upper chord transverse diaphragm 10 is provided at the connection between the connecting columns 9 of the Π-shaped upper chord beam section 1. The lower chord beam section 2 is provided with a lower chord transverse diaphragm 11 at the connection position of the connecting column 9.

[0039] 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:

[0040]

[0041]

[0042] 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 plate 6 of the lower chord, h2 and t2 are the height and thickness of the web plate 7 of the lower chord respectively;

[0043] The size relationship between the spacing b1 of the upper chord web 5 at the connection with the upper and lower chord converging nodes 3, the spacing b2 of the lower chord web 7 and the spacing b3 of the web at the upper and lower chord converging nodes 3 is: b1 = b2 = b3;

[0044] The dimensional relationship among the thickness t1 of the upper chord web 5 connected to the upper and lower chord converging nodes 3, the thickness t2 of the lower chord web 7 and the thickness t3 of the web of the upper and lower chord converging 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 Π-shaped upper chord beam section (1), The Π-shaped lower chord beam section (2), the upper and lower chord junction node (3) and the Π-shaped upper chord beam section (1) and A connecting column (9) is arranged between the lower chord beam sections (2); The Π-shaped 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 chamfer 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 web plates (7), the lower chord bottom plate (6) is connected to the lower chord web plate (7), and a chamfer transition is provided at the connection; The top surface of the lower chord web plate (7) of the 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 lateral positions of the outer sides or inner sides or center lines of the upper chord webs (5) and the lower chord webs (7) correspond one to one; The Π-shaped upper chord beam section (1) and The lower chord beam section (2) is connected at the junction through the upper and lower chord junction node (3) to form an integral box beam section, and the upper chord web plate (5) and the lower chord web plate (7) are connected one by one through a circular arc transition (8); The Π-shaped upper chord beam section (1) and At least one vertical connecting column (9) is provided between the Π-shaped lower chord beam sections (2); an upper chord transverse diaphragm (10) is provided at the connection between the connecting columns (9) of the Π-shaped upper chord beam sections (1); A lower chord beam section (2) is provided with a lower chord transverse partition (11) at the connection position of 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 geometrical dimensions of the lower chord bottom plate (6) and the lower chord web plate (7) need to satisfy 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 plate (6) of the lower chord, h2 and t2 are the height and thickness of the web plate (7) of the lower chord respectively; The dimensional relationship between the spacing b1 of the upper chord web (5) at the connection with the upper and lower chord converging nodes (3), the spacing b2 of the lower chord web (7) and the spacing b3 of the web at the upper and lower chord converging nodes (3) is: b1 = b2 = b3; The dimensional relationship between the thickness t1 of the upper chord web (5) connected to the upper and lower chord converging nodes (3), the thickness t2 of the lower chord web (7) and the thickness t3 of the web of the upper and lower chord converging nodes (3) is: t1=t2=t3.

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