Urban viaduct main line diversion and confluence widening section combination structure

Abstract

The invention discloses an urban viaduct main line diverging and converging widening section combined structure which comprises a normal bridge section and a widening bridge section which are located on the two sides of a main line road center line respectively. The combined structure comprises a linear end cross beam, a middle cross beam, a steel-concrete combined small box girder and a broken line type end cross beam which are arranged in the extending direction of the center line of the main road, wherein the middle cross beam and the steel-concrete combined small box girder are arranged between the linear end cross beam and the broken line type end cross beam at intervals. The steel box girder is pulled and the concrete bridge deck slab is pressed at the same time, so that the span of the main line flow dividing and converging widening section is further increased, the widening and slope changing adaptability of the main line flow dividing and converging section is improved, and the end cross beam prestress setting and slab staggering phenomena are avoided; the steel box girder is rapid in construction, short in period and small in influence on surrounding traffic and environment.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a main line diverging and merging widening section combination structure of an urban viaduct. Background Art

[0002] The main feature of building interchange hubs and viaducts in cities is that special-shaped bridge structures need to be set up at the junctions and merging locations of the main line bridge and ramp bridge, so that the main line bridge traffic and ramp bridge traffic can be effectively combined. The traditional main line junction and merging widening section adopts cast-in-place large box girders, which have the following problems: 1. The span of the longitudinal reinforced concrete structure is limited, the prestressed design of the end beam of the main line junction and merging widening section is complex, and the construction is difficult; 2. For the main line, double cross slopes are used, and the ramp is set with an ultra-high three-cross slope section, and the bridge deck elevation on both sides of the split span position is prone to misalignment; 3. The full-span support is used for construction, which is complex and has a long construction period. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a combined structure of a main line diverging and merging widening section of an urban viaduct to solve the deficiencies in the prior art.

[0004] In order to achieve the above object, the present invention is achieved through the following technical solutions:

[0005] Provided is a combined structure of a main line diverging and merging widening section of an urban viaduct, wherein the main line diverging and merging widening section of the urban viaduct comprises a normal bridge section and a widened bridge section respectively located on both sides of the center line of the main line road, wherein the combined structure comprises a straight end cross beam, an intermediate cross beam, a steel-concrete composite small box beam and a broken line end cross beam arranged along the extension direction of the center line of the main line road, wherein the intermediate cross beam and the steel-concrete composite small box beam are arranged at intervals between the straight end cross beam and the broken line end cross beam.

[0006] For example, the main line of the urban viaduct has a combined structure with a widening section, wherein the steel-concrete composite small box girder is made of multiple pieces of trough-shaped steel box girders spliced ​​together and a concrete bridge deck is laid on the surface.

[0007] As described in the combined structure of the main line diverging and widening sections of the urban elevated bridge, wherein the middle crossbeam outside the ridge line range of the normal bridge section and the widened bridge section has a first transverse slope, and the middle crossbeam within the ridge line range of the widened bridge section has a second transverse slope and a third transverse slope respectively located on both sides of the ridge line.

[0008] For example, in the combined structure of the main line diverging and merging widening section of the urban viaduct, the concrete bridge deck located between the road ridge line and the center line of the main road adopts a thickened bridge deck.

[0009] The beneficial effects of the technical solution of the present invention are:

[0010] At the same time, the steel box girder is used to bear tension and the concrete bridge deck is used to bear compression, which further increases the span of the main line diverging and widening section, and improves the adaptability of the main line diverging and widening section and slope change, thereby avoiding the setting of prestressed end beams and the phenomenon of misalignment. The steel box girder is fast to construct, with a short period of time and little impact on the surrounding traffic and environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] To further illustrate the above-mentioned objectives, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0012] Figure 1 It is a general plan view of a preferred embodiment of the present invention;

[0013] Figure 2 It is a general elevation view of a preferred embodiment of the present invention;

[0014] Figure 3 for Figure 1 Cross-section along line AA;

[0015] Figure 4 This is a schematic plan view of the cross slope arrangement of a preferred embodiment of the present invention;

[0016] Figure 5 for Figure 4 Cross-section of the bridge deck along line BB;

[0017] Figure 6 for Figure 4 Cross-section of the bridge deck along the CC line;

[0018] In the figure: 1. Center line of main road; 2. Normal bridge section; 3. Widened bridge section; 4. Straight end beam; 5. Middle beam; 6. Steel-concrete composite small box beam; 7. Broken line end beam; 8. Channel steel box beam; 9. Concrete bridge deck; 10. Road ridge line; 11. Center line of ramp road. DETAILED DESCRIPTION

[0019] The terms "invention", "present invention" and "the present invention" used in this specification are intended to refer broadly to all subject matter of this specification and any patent claims below. Statements containing these terms should not be understood to limit the subject matter described herein or to limit the meaning or scope of any patent claim below. In addition, this specification does not attempt to describe or limit the subject matter covered by any claim of any specific component, paragraph, statement or figure of this application. The subject matter should be understood with reference to the entire specification, all drawings and any claims below. The present invention may have other embodiments and be practiced or implemented in other ways. Moreover, it should be understood that the words and terms used herein are for illustrative purposes and should not be considered as limiting.

[0020] The details of the present invention will now be discussed with reference to the accompanying drawings which illustrate the present invention by way of example only. In the accompanying drawings, similar features or components may be marked with the same reference numerals.

[0021] The use of "including," "having," and "comprising" and variations thereof herein is meant to encompass the items listed thereafter and their equivalents and additional items. Although reference may be made to directions such as above, below, upward, downward, rearward, bottom, top, front, rear, etc., in describing the drawings, for convenience, reference is made relative to the drawings. These directions are not intended to literally accept or limit the present invention in any form. In addition, terms such as "first," "second," "third," etc., are used herein for illustrative purposes and are not intended to indicate or imply importance or significance.

[0022] See also Figure 1 , Figure 2 As shown, the main line diverging and merging widening section of the urban viaduct includes a normal bridge section 2 and a widened bridge section 3 respectively located on both sides of the center line 1 of the main line road. In a preferred embodiment, the combined structure of the main line diverging and merging widening section of the urban viaduct of the present invention includes a straight end cross beam 4, an intermediate cross beam 5, a steel-concrete composite small box beam 6 and a broken line end cross beam 7 arranged along the extension direction of the center line 1 of the main line road, and the intermediate cross beam 5 and the steel-concrete composite small box beam 6 are arranged at intervals between the straight end cross beam 4 and the broken line end cross beam 7.

[0023] See also Figure 3 As shown, the steel-concrete composite small box girder 6 is made of multiple trough steel box girders 8 spliced ​​together and a concrete bridge deck 9 is laid on the surface. By using multiple composite small box girders, the skew angle and structural line type of each steel box girder can be adjusted according to the widening range and line type, so as to better adapt to the widening range of the bridge deck.

[0024] See also Figure 4 , Figure 5 and Figure 6 As shown, the normal bridge section 2 and the middle cross beam 5 located outside the ridge line 10 of the widened bridge section 3 have a first transverse slope i1, and the middle cross beam 5 located within the ridge line 10 of the widened bridge section 3 has a second transverse slope i2 and a third transverse slope i3 located on both sides of the ridge line 10 respectively.

[0025] Furthermore, the concrete bridge deck 9 between the road ridge line 10 and the main road center line 1 is a thickened bridge deck. In the figure, reference numeral 11 indicates the ramp road center line.

[0026] Specifically, the double transverse slopes of the middle beam 5 within the ridgeline 10 should be calculated according to the actual bridge deck elevation, and the bridge deck top elevation should be calculated according to the bridge deck elevation of the ridgeline at the corresponding position. Taking a certain elevated main line diverging and merging section as an example, calculate the transverse slope of the middle beam 5 and the thickness of the bridge deck:

[0027] (1) Parameter description

[0028] Assume that the elevation of the outermost bridge deck is Q0, the elevation of the bridge deck at the center line 1 of the main road is Q1, the elevation of the top of the bridge deck is T, the elevation of the bottom of the bridge deck is B (i.e. the top elevation of the middle cross beam 5), the standard thickness of the concrete bridge deck 9 is H1, the thickness of the concrete bridge deck 9 at the ridge line 10 is H2, the cross slope of the middle cross beam 5 outside the ridge line 10 is i1, the cross slopes of the middle cross beam 5 within the ridge line 10 are i2 and i3, the length of the widened bridge section of the middle cross beam 5 is L1, and the distance between the ridge line 10 and the center 1 of the main road is L2.

[0029] (2) Calculation process

[0030] ①Outside the ridgeline

[0031] Slope i1, thickness of concrete bridge deck 9 H1 = 0.25m.

[0032] ②Within the ridgeline

[0033] Because the ridge line 10 is located in accordance with Figure 6 On the left side of the road in the forward direction, the slope i2 on the right side of the ridge line 10 is the same as that outside the ridge line 10, and the slope i3 on the left side of the ridge line 10 and the thickness of the bridge deck on the right side of the ridge line 10 are as follows:

[0034] i3=(Q1-Q0) / L1×100%

[0035] H2=T-(B-L2×i2)

[0036] Due to the adoption of the above structure, the present invention has the following characteristics:

[0037] 1. The main line diverging and merging section adopts a steel-concrete composite small box girder. The upper edge of the mid-span control section is compressed with a concrete bridge deck, and the lower edge is tensile with a steel box girder, which further increases the span of the main line diverging and merging widening section;

[0038] 2. The steel box girder adopts multiple composite small box girders, which can adapt to structural lines such as circular curves and broken lines, so as to better adapt to various bridge deck widening forms;

[0039] 3. For the slope change of the main line diverging and merging sections, the middle cross beam within the ridge line of this structure is set as a double cross slope, and the upper edge concrete bridge deck adopts a thickened bridge deck to achieve a three-cross slope bridge deck.

[0040] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A main line diverging and merging widening section combination structure of an urban viaduct, wherein the main line diverging and merging widening section of the urban viaduct comprises a normal bridge section and a widening bridge section respectively located on both sides of the center line of the main line road, characterized in that: It includes a straight end cross beam, an intermediate cross beam, a steel-concrete composite small box beam and a broken line end cross beam arranged along the extension direction of the center line of the main road, and the intermediate cross beam and the steel-concrete composite small box beam are arranged at intervals between the straight end cross beam and the broken line end cross beam.

2. The main line diverging and converging widening section combined structure of the urban viaduct as claimed in claim 1 is characterized in that: The steel-concrete composite small box girder is made of multiple grooved steel box girders that are spliced ​​together and a concrete bridge deck is laid on the surface.

3. The main line diverging and converging widening section combined structure of the urban viaduct as claimed in claim 2 is characterized in that: The middle cross beam outside the ridgeline range of the normal bridge section and the widened bridge section has a first transverse slope, and the middle cross beam within the ridgeline range of the widened bridge section has a second transverse slope and a third transverse slope respectively located on both sides of the ridgeline.

4. The main line branching and converging widening section combined structure of the urban viaduct as claimed in claim 3 is characterized in that: The concrete bridge deck located between the road ridge line and the center line of the main road adopts a thickened bridge deck.

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