Variable height large edge span hybrid girder cable-stayed bridge

Abstract

This invention relates to the field of bridge engineering technology, specifically to a variable-height, large-span hybrid beam cable-stayed bridge, comprising bridge towers, piers, main beams, and cables. The piers include side piers and auxiliary piers. The main beam comprises equal-height concrete beams for the side spans, variable-height concrete beams for the side spans, equal-height concrete beams for the tower area, a steel-concrete composite section, and equal-height steel beams for the middle span. The side span beams adopt a variable-height, large-span structural beam structure. This design effectively adapts to complex terrain, reduces the number of auxiliary piers, lowers the water resistance rate, facilitates navigation and flood control, and saves investment. The self-weight of the side spans of the hybrid beam cable-stayed bridge is significantly increased, eliminating the need for side span counterweights on the auxiliary piers to balance the load on the main beam in the middle span. It exhibits high stiffness and small beam end rotation angles, which is beneficial for the smoothness of high-speed train operation. The bridge employs symmetrical cantilever construction using hanging baskets, and is constructed simultaneously with the bridge towers. The cast-in-place support erection area is small, making the construction application wide-ranging, convenient, quick, economical, and significantly shortening the construction period. It also benefits flood control and construction safety during the construction period.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, specifically to a variable-height, large-span hybrid beam cable-stayed bridge. Background Technology

[0002] With the rapid development of high-speed railways in my country, there is an increasing need for long-span bridges to cross large rivers with complex terrain. Hybrid beam cable-stayed bridges offer better adaptability and economy. However, currently, the side spans of hybrid beam cable-stayed bridges generally use beams of equal height and have relatively small spans, as shown in the attached figure. Figure 1 As shown. This type of cable-stayed bridge has the following disadvantages: (1) The overall stiffness of the bridge is relatively small and the beam end rotation angle is relatively large; (2) The side span is small, requiring more auxiliary piers, resulting in a large water resistance rate; (3) The side span uses equal-height beams, which are relatively light in weight and require counterweight measures; (4) The equal-height beams require large-scale scaffolding to be erected and poured on-site, but the erection of scaffolding is often limited by the terrain, resulting in a high risk factor. The erection of large-scale scaffolding affects the flow of water, and the cost of temporary facilities is high, resulting in poor economic efficiency.

[0003] Therefore, a solution is needed to address the problems in the existing technology. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this invention provides a variable-height, large-span hybrid beam cable-stayed bridge with a simple and reasonable structure, high overall stiffness, small beam end rotation angle, no need for side span counterweight, convenient and quick construction, good overall performance, and significant economic benefits.

[0005] To address the aforementioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0006] A variable-height, large-span hybrid beam cable-stayed bridge includes bridge towers, piers, main beams, and cables. The piers include side piers and auxiliary piers. The main beam includes side span equal-height concrete beams, side span variable-height concrete beams, tower area equal-height concrete beams, steel-concrete composite sections, and mid-span equal-height steel beams. The side span beams adopt a variable-height, large-span structural beam structure.

[0007] As a preferred embodiment of the variable-height, large-span hybrid beam cable-stayed bridge described in this invention, the variable-height concrete beam of the side span is formed by symmetrical cantilever casting using a hanging basket.

[0008] As a preferred embodiment of the variable-height, large-span hybrid beam cable-stayed bridge described in this invention, the side-span equal-height concrete beams, the side-span variable-height concrete beams, and the tower area equal-height concrete beams are all made of concrete.

[0009] As a preferred embodiment of the variable-height, large-span hybrid beam cable-stayed bridge described in this invention, the side piers are located at the outer ends of the equal-height concrete beams of the side spans.

[0010] As a preferred embodiment of the variable-height, large-span hybrid beam cable-stayed bridge described in this invention, the auxiliary pier is disposed between the side pier and the bridge tower.

[0011] To solve the above-mentioned technical problems, according to another aspect of the present invention, the present invention also provides a construction method for a variable-height, large-span hybrid beam cable-stayed bridge, specifically the following technical solution:

[0012] A construction method for a variable-height, large-span hybrid beam cable-stayed bridge includes:

[0013] S1. Construction of side piers, auxiliary piers, and variable-height concrete beams for side spans, with bridge towers constructed simultaneously;

[0014] S2, equal-height concrete beams for construction side spans, equal-height concrete beams for tower areas, and steel-concrete composite sections;

[0015] S3, construction of the steel beams of equal height in the middle span.

[0016] As a preferred embodiment of the construction method for a variable-height, large-span hybrid beam cable-stayed bridge according to the present invention, step S1 specifically includes setting temporary fixed constraints on the upper part of the auxiliary pier, constructing the No. 0 concrete beam block, and then using a hanging basket for symmetrical cantilever construction, while the bridge tower is constructed simultaneously.

[0017] As a preferred embodiment of the construction method for a variable-height, large-span hybrid beam cable-stayed bridge according to the present invention, step S2 specifically includes constructing equal-height concrete beams for the side spans using scaffolding.

[0018] As a preferred embodiment of the construction method for a variable-height, large-span hybrid beam cable-stayed bridge according to the present invention, step S2 specifically includes the construction of the equal-height concrete beams in the tower area and the steel-concrete composite section using tower-side brackets.

[0019] As a preferred embodiment of the construction method for a variable-height, large-span hybrid beam cable-stayed bridge according to the present invention, step S3 specifically includes using a bridge deck crane to lift and hoist the steel beam segments of equal height in the middle span, finely adjusting the segments to their positions and connecting them by bolting and welding, and then installing and tensioning the corresponding cable stays. The above steps are repeated to install the steel beam segments of equal height in the middle span in sequence until the main span is closed.

[0020] The beneficial effects of this invention are as follows:

[0021] (1) The side spans of the hybrid beam cable-stayed bridge adopt a structure with variable height and large span, which can effectively improve the overall stiffness of the bridge, reduce the beam end rotation angle, and facilitate the smoothness of high-speed train operation.

[0022] (2) The side span adopts a variable height and large span structure, which can adapt well to complex terrain, reduce the number of auxiliary piers, reduce water resistance, facilitate navigation and flood control, and save investment.

[0023] (3) The side span adopts a variable height and large span structure, which significantly increases the self-weight of the side span of the hybrid beam cable-stayed bridge. There is no need to use the side span counterweight on the top of the auxiliary pier to balance the load of the main beam in the middle span.

[0024] (4) The side span of the variable height concrete beam with large span adopts the symmetrical cantilever construction with hanging basket and is constructed simultaneously with the bridge tower; the cast-in-place support has a small erection range, a wide range of construction applications, is convenient and fast, economical, significantly shortens the construction period, and is conducive to flood control and construction safety during the construction period. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 This is a structural schematic diagram of a hybrid beam cable-stayed bridge based on existing technology.

[0027] Figure 2 This is a schematic diagram of the cable-stayed bridge structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the construction of the side piers, auxiliary piers, and bridge towers of the cable-stayed bridge of the present invention, as well as the symmetrical cantilever construction of the side span variable height concrete beam using a hanging basket.

[0029] Figure 4 This is a construction schematic diagram of the equal-height concrete beams in the side spans, the equal-height concrete beams in the tower area, and the steel-concrete composite section of the cable-stayed bridge of the present invention.

[0030] Figure 5 This is a schematic diagram of the construction of the equal-height steel beams and stay cables in the mid-span of the cable-stayed bridge of the present invention.

[0031] Explanation of icon numbers:

[0032] 1—Bridge tower, 2-1—Side span equal-height concrete beam, 2-2—Side span variable-height concrete beam, 2-3—Tower area equal-height concrete beam, 2-4—Mid-span equal-height steel beam, 3—Steel-concrete composite section, 4—Side pier, 5—Auxiliary pier, 6—Cable.

[0033] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions described below in conjunction with the embodiments will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0037] This invention provides a variable-height, large-span hybrid beam cable-stayed bridge and its construction method, which can improve the overall stiffness of the beam, shorten the construction period, and save investment. The variable-height, large-span structure of the side spans can adapt well to complex terrain, reduce the number of auxiliary piers, reduce the water resistance rate, facilitate navigation and flood control, and save investment. The variable-height, large-span structure of the side spans significantly increases the self-weight of the side spans of the hybrid beam cable-stayed bridge, eliminating the need for side span counterweights on the top of auxiliary piers to balance the load of the main beam in the middle span. The variable-height, large-span side spans are constructed using symmetrical cantilever construction with hanging baskets, and are constructed simultaneously with the bridge towers. The cast-in-place support has a small erection range, a wide range of application, is convenient and quick, economical, significantly shortens the construction period, and is beneficial to flood control and construction safety during the construction period.

[0038] like Figure 2-5As shown, in one embodiment of the present invention, the variable-height, large-span hybrid beam cable-stayed bridge has a span arrangement of (96+96+384+96+96) m, specifically including bridge towers 1, piers, main beams, and cables 6. The piers include side piers 4 and auxiliary piers 5. The main beam includes side span equal-height concrete beams 2-1, side span variable-height concrete beams 2-2, tower area equal-height concrete beams 2-3, mid-span equal-height steel beams 2-4, and a steel-concrete composite section 3. The side span variable-height concrete beams 2-2 adopt a variable-height, large-span structural beam. In this embodiment, the side span variable-height concrete beams 2-2 are formed by symmetrical cantilever casting using a hanging basket. In this embodiment, the auxiliary piers 5 are located between the side piers 4 and the bridge towers 1.

[0039] The variable-height, large-span hybrid beam cable-stayed bridge of this embodiment can be completed through the following steps:

[0040] A construction method for a variable-height, large-span hybrid beam cable-stayed bridge includes:

[0041] S1, construction of side pier 4, auxiliary pier 5 and side span variable height concrete beam 2-2, and simultaneous construction of bridge tower 1; specifically, temporary fixed constraints are set on the upper part of auxiliary pier 5, concrete beam No. 0 is constructed, and then symmetrical suspended pouring is carried out using hanging baskets, while bridge tower 1 is constructed simultaneously.

[0042] S2, construction of equal-height concrete beams 2-1 on the side span, equal-height concrete beams 2-3 in the tower area, and steel-concrete composite section 3; specifically, the construction of equal-height concrete beams 2-1 on the side span is carried out using scaffolding, and the construction of equal-height concrete beams 2-3 in the tower area and steel-concrete composite section 3 is carried out using tower-side brackets.

[0043] Construction of S3 and the middle-span equal-height steel beams 2-4: Specifically, the middle-span equal-height steel beam segments are lifted and hoisted using a bridge deck crane. After the segments are precisely adjusted and connected by bolting and welding, the corresponding stay cables 6 are tensioned. The above steps are repeated to install the middle-span equal-height steel beams 2-4 in sequence until the main span is closed.

[0044] like Figure 2-5 As shown, another embodiment of the variable-height, large-span hybrid beam cable-stayed bridge of the present invention has a span arrangement of (96+96+384+96+96)m, specifically including bridge towers 1, piers, main beams, and cables 6. The piers include side piers 4 and auxiliary piers 5. The main beam includes side span equal-height concrete beams 2-1, side span variable-height concrete beams 2-2, tower area equal-height concrete beams 2-3, mid-span equal-height steel beams 2-4, and a steel-concrete composite section 3. The side span variable-height concrete beams 2-2 adopt a variable-height, large-span structural beam. In this embodiment, the side span variable-height concrete beams 2-2 are formed by symmetrical cantilever casting using a hanging basket. In this embodiment, the auxiliary piers 5 are located between the side piers 4 and the bridge towers 1; in this embodiment, the side span equal-height concrete beams 2-1 and the tower area equal-height concrete beams 2-3 are both concrete beams.

[0045] The variable-height, large-span hybrid beam cable-stayed bridge of this embodiment can be completed through the following steps:

[0046] A construction method for a variable-height, large-span hybrid beam cable-stayed bridge includes:

[0047] S1, construction of side pier 4, auxiliary pier 5 and side span variable height concrete beam 2-2, and simultaneous construction of bridge tower 1; specifically, temporary fixed constraints are set on the upper part of auxiliary pier 5, concrete beam No. 0 is constructed, and then symmetrical suspended pouring is carried out using hanging baskets, while bridge tower 1 is constructed simultaneously.

[0048] S2, construction of equal-height concrete beams 2-1 on the side span, equal-height concrete beams 2-3 in the tower area, and steel-concrete composite section 3; specifically, the construction of equal-height concrete beams 2-1 on the side span is carried out using scaffolding, and the construction of equal-height concrete beams 2-3 in the tower area and steel-concrete composite section 3 is carried out using tower-side brackets.

[0049] Construction of S3 and the middle-span equal-height steel beams 2-4: Specifically, the middle-span equal-height steel beam segments are lifted and hoisted using a bridge deck crane. After the segments are precisely adjusted and connected by bolting and welding, the corresponding stay cables 6 are tensioned. The above steps are repeated to install the middle-span equal-height steel beams 2-4 in sequence until the main span is closed.

[0050] like Figure 2-5 As shown, another embodiment of the variable-height, large-span hybrid beam cable-stayed bridge of the present invention has a span arrangement of (96+96+384+96+96)m, specifically including bridge towers 1, piers, main beams, and cables 6. The piers include side piers 4 and auxiliary piers 5. The main beam includes side span equal-height concrete beams 2-1, side span variable-height concrete beams 2-2, tower area equal-height concrete beams 2-3, mid-span equal-height steel beams 2-4, and a steel-concrete composite section 3. The side span variable-height concrete beams 2-2 adopt a variable-height, large-span structural beam. In this embodiment, the side span variable-height concrete beams 2-2 are formed by symmetrical cantilever casting using hanging baskets. In this embodiment, the auxiliary pier 5 is located between the side pier 4 and the bridge tower 1; in this embodiment, both the side span equal-height concrete beam 2-1 and the tower area equal-height concrete beam 2-3 are concrete beams; in this embodiment, the side pier 4 is located at the outer end of the side span equal-height concrete beam 2-1; the variable-height large side span hybrid beam cable-stayed bridge of this embodiment can be completed through the following steps:

[0051] A construction method for a variable-height, large-span hybrid beam cable-stayed bridge includes:

[0052] S1, construction of side pier 4, auxiliary pier 5 and side span variable height concrete beam 2-2, and simultaneous construction of bridge tower 1; specifically, temporary fixed constraints are set on the upper part of auxiliary pier 5, concrete beam No. 0 is constructed, and then symmetrical suspended pouring is carried out using hanging baskets, while bridge tower 1 is constructed simultaneously.

[0053] S2, construction of equal-height concrete beams 2-1 on the side span, equal-height concrete beams 2-3 in the tower area, and steel-concrete composite section 3; specifically, the construction of equal-height concrete beams 2-1 on the side span is carried out using scaffolding, and the construction of equal-height concrete beams 2-3 in the tower area and steel-concrete composite section 3 is carried out using tower-side brackets.

[0054] Construction of S3 and the middle-span equal-height steel beams 2-4: Specifically, the middle-span equal-height steel beam segments are lifted and hoisted using a bridge deck crane. After the segments are precisely adjusted and connected by bolting and welding, the corresponding stay cables 6 are tensioned. The above steps are repeated to install the middle-span equal-height steel beams 2-4 in sequence until the main span is closed.

[0055] This invention discloses a variable-height, large-span hybrid beam cable-stayed bridge. It replaces the current equal-height, small-span concrete beams with variable-height, large-span side spans, overcoming the problems associated with equal-height, small-span concrete beams in terms of structural performance, construction support range, weight distribution, pier placement, and economic benefits. The variable-height, large-span structure of the side spans adapts well to complex terrain, reduces the number of auxiliary piers, lowers the water resistance rate, facilitates navigation and flood control, and saves investment. The variable-height, large-span structure significantly increases the self-weight of the side spans, eliminating the need for weight distribution on the auxiliary piers to balance the load on the main beam in the middle span. The variable-height, large-span side spans are constructed using symmetrical cantilever construction with hanging baskets, and are constructed simultaneously with the bridge towers. The cast-in-place support has a small erection range, a wide range of applicability, is convenient and quick, economical, and significantly shortens the construction period. It also benefits flood control and construction safety during the construction period, achieving significant economic and social benefits.

[0056] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A variable-height, large-span hybrid beam cable-stayed bridge, characterized in that, The bridge includes towers, piers, main beams, and cables. The piers include side piers and auxiliary piers. The main beam, from the outside in, includes, in sequence, side span equal-height concrete beams, side span variable-height concrete beams, tower area equal-height concrete beams, steel-concrete composite sections, and mid-span equal-height steel beams. The auxiliary piers are located between the side piers and the towers. The side span beams adopt variable-height, large-span structural beams, which can improve the overall stiffness of the bridge, reduce beam end rotation angles, and facilitate the smoothness of high-speed train operation. It can adapt to complex terrain, reduce the number of auxiliary piers, reduce water resistance, facilitate navigation and flood control, and save investment. The self-weight of the side spans of the hybrid beam cable-stayed bridge is significantly increased, eliminating the need to use side span counterweights on the top of the auxiliary piers to balance the load of the mid-span main beam.

2. The variable-height, large-span hybrid beam cable-stayed bridge according to claim 1, characterized in that, The side span variable height concrete beams were formed by symmetrical cantilever casting using hanging baskets.

3. A variable-height, large-span hybrid beam cable-stayed bridge according to claim 1, characterized in that, The side span equal-height concrete beams, side span variable-height concrete beams, and tower area equal-height concrete beams are all made of concrete.

4. A variable-height, large-span hybrid beam cable-stayed bridge according to claim 1, characterized in that, The side piers are located at the outer ends of the concrete beams of equal height in the side spans.

5. A construction method for a variable-height, large-span hybrid beam cable-stayed bridge as described in any one of claims 1-4, characterized in that, include: S1. Construction of side piers, auxiliary piers, and variable-height concrete beams for side spans, with bridge towers constructed simultaneously; S2, equal-height concrete beams for construction side spans, equal-height concrete beams for tower areas, and steel-concrete composite sections; S3, construction of the steel beams of equal height in the middle span.

6. The construction method for a variable-height, large-span hybrid beam cable-stayed bridge according to claim 5, characterized in that, Step S1 specifically includes setting temporary fixed constraints on the upper part of the auxiliary pier, constructing the No. 0 concrete beam, and then using a hanging basket for symmetrical suspended pouring, while the bridge tower is constructed simultaneously.

7. The construction method for a variable-height, large-span hybrid beam cable-stayed bridge according to claim 5, characterized in that, Step S2 specifically includes constructing equal-height concrete beams for the side spans using scaffolding.

8. The construction method for a variable-height, large-span hybrid beam cable-stayed bridge according to claim 7, characterized in that, Step S2 specifically includes the construction of the tower area's equal-height concrete beams and steel-concrete composite sections using tower-side brackets.

9. The construction method for a variable-height, large-span hybrid beam cable-stayed bridge according to claim 5, characterized in that, Step S3 specifically includes using a bridge deck crane to lift and hoist the mid-span equal-height steel beam segments, finely adjusting the segments to their positions and bolting and welding them together, then installing and tensioning the corresponding stay cables. The above steps are repeated to install the mid-span equal-height steel beam segments in sequence until the main span is closed.

Images