Bridge ballasting area load set regulation and control technology

Abstract

The invention relates to the technical field of bridges, in particular to a bridge ballasting area load concentration regulation and control technology, a bridge ballasting load concentration regulation and control structure comprises a side span steel box arch and further comprises a hollow sealing body arranged in the side span steel box arch, and the hollow sealing body is arranged close to one end, close to a column pier support, of the side span steel box arch. The at least two hollow sealing bodies are distributed at intervals along the arch axis direction of the side span steel box arch; and the ballasting concrete is filled between the side span steel box arch and the hollow sealing body. The technical problems that in the prior art, box chambers of a side span steel box arch are directly filled with too much ballasting concrete, too large arch foot hogging moment and midspan sagging moment are likely to be caused, and a steel structure is likely to bend out of a plane can be solved; or the problems that the ballasting efficiency of ballasting concrete close to an arch foot is low, and the ballasting effect needs to be accurately regulated and controlled are solved.

Description

Technical Field

[0001] This invention relates to the field of bridge technology, and in particular to a technology for controlling the load intensity in the bridge's ballast zone. Background Technology

[0002] Swallow-shaped arch bridges are thrust-free rigid tied arch bridges, and the rigid tie rods do not require pretensioning. If only steel box arches and steel beam structures are used as their side arch structures, their self-weight cannot provide sufficient thrust at the arch feet. Therefore, the side arches of existing swallow-shaped arch bridges are steel-concrete composite structures. Concrete is filled into the steel box structure to increase the weight of the side arches to balance the thrust required by the arch bridge. The main function of the concrete is to provide ballast and improve the out-of-plane stability of the compression plates. However, this design leads to the following problems: (1) The side span steel box arch and the inner cavity of the steel box arch are too large. Excessive weighted concrete will lead to excessive negative bending moment at the arch foot and positive bending moment at the mid-span, which is not conducive to the overall stress of the flying swallow arch bridge.

[0003] (2) The counterweight concrete filling near the column support has a low counterweight efficiency due to its small lever arm.

[0004] (3) If each box of the side span steel box arch is designed as a sealed box and the counterweight concrete is selectively filled according to the required amount of counterweight, stress concentration and out-of-plane buckling of steel structure plates will occur at the junction of the box filled and unfilled with counterweight concrete, affecting structural safety. At the same time, the design of the sealed box of the steel structure is complicated and the construction is difficult.

[0005] To address the aforementioned issues, provide the required counterweight weight for the bridge structure, and flexibly adjust the counterweight size according to actual counterweight requirements, thereby improving the internal forces at the arch foot and mid-span and resolving the out-of-plane stability of the steel structure, it is necessary to adopt a load intensity control technology for the bridge counterweight zone. Summary of the Invention

[0006] The purpose of this invention is to overcome the technical problems of existing technology, which directly fills the box chambers of the side span steel box arch with counterweight concrete, resulting in low counterweight efficiency of the counterweight concrete, which easily leads to excessive negative bending moment at the arch foot and positive bending moment at the mid-span, and the steel structure is prone to out-of-plane buckling. The invention provides a load intensity control technology for the counterweight zone of bridges.

[0007] In a first aspect, the present invention provides a bridge counterweight load intensity control structure, including a side span steel box arch, and further comprising: Hollow sealing bodies are installed inside the side span steel box arch, with the hollow sealing bodies located near the end of the side span steel box arch that is close to the column support. At least two hollow sealing bodies are distributed at intervals along the arch axis of the side span steel box arch. The counterweight concrete is used to fill the space between the side span steel box arch and the hollow sealing body.

[0008] This solution involves installing a hollow sealing body inside the end of the side span steel box arch near the column pier support. This hollow sealing body creates a cavity inside the side span steel box arch without any counterweight concrete filling. Therefore, by changing the volume and position distribution of the hollow sealing body, the overall weight and center of gravity of the counterweight concrete can be adjusted. Compared to existing technologies, this solution has the following advantages: (1) Compared with the scheme of directly filling the steel box arch of the side span with counterweight concrete, this scheme can accurately adjust the overall weight and center of gravity of the counterweight concrete, thereby reducing the negative bending moment at the arch foot and the positive bending moment at the mid-span, and making the counterweight area uniformly reduce the weight along the direction of structural stress, which is beneficial to the overall stress of the swallow-shaped arch bridge.

[0009] (2) Compared with the scheme of designing a complex box structure in the side span steel box arch and selectively filling it with counterweight concrete, this scheme only requires connecting a hollow sealing body in the side span steel box arch, without the need for a complex sealing box structure and corresponding pouring process design. This is conducive to simplifying and speeding up the manufacturing and construction process of the side span steel box arch and reducing manufacturing and construction costs. At the same time, compared with a fixed box structure, the installation position of the hollow sealing body can be adjusted on site, so that when the actual construction situation changes from the design situation, the center of gravity position of the counterweight concrete can be flexibly adjusted according to the site situation, which has higher construction flexibility.

[0010] (3) The hollow sealing body is set close to the column support, which can make the cavity of the ballast concrete closer to the column support, thereby allowing more ballast concrete to move away from the column support and obtain a larger lever arm, which can improve the ballast efficiency of the ballast concrete in this scheme and achieve an equivalent ballast response with less ballast concrete. Preferably, the hollow sealing body is a tubular component, and end caps are provided at both ends of the tubular component.

[0011] This solution provides one specific hollow sealing structure, which is convenient for manufacturing and installation, and also allows for adjustment of the total weight and center of gravity of the counterweight concrete by adjusting the length of the tubular components.

[0012] Preferably, the hollow sealing bodies are divided into two groups along the arch axis of the side span steel box arch. The axial direction of the group of hollow sealing bodies closer to the column pier support is perpendicular to the arch axis of the side span steel box arch, while the axial direction of the group of hollow sealing bodies farther from the column pier support is perpendicular to the horizontal direction.

[0013] To match the stress characteristics of the side span steel box arch, the axial direction of the hollow sealing body should be as perpendicular as possible to the arch axis of the side span steel box arch. However, due to the bridge structure, the existing side span steel box arch has its box chambers continuously distributed horizontally at the end away from the column pier support, and its sidewalls are set vertically. Therefore, this scheme divides the hollow sealing body into two groups. The axial direction of the hollow sealing body near the column pier support is perpendicular to the arch axis of the side span steel box arch to match the stress characteristics of the side span steel box arch as much as possible. The axial direction of the hollow sealing body away from the column pier support is set perpendicular to the horizontal direction to reduce structural interference between the hollow sealing body and the box chamber.

[0014] Preferably, the cross-sectional shape of the tubular component is circular or elliptical.

[0015] This solution enables more uniform force transmission between the tubular component and its surrounding ballast concrete and steel structure, thereby improving and avoiding stress concentration caused by cavities in the ballast concrete.

[0016] Preferably, there is a gap between the outer wall of the hollow seal and the inner wall of the side span steel box arch.

[0017] This scheme allows the hollow sealing body to occupy only the central space of each chamber of the side span steel box arch, resulting in less weakening of the cross-section of the side span steel box arch considering the counterweight concrete. The side span steel box arch and the counterweight concrete can both transmit pressure and serve as out-of-plane supports for the steel plates of the side span steel box arch, thereby avoiding the risk of steel plate instability in the prior art.

[0018] Preferably, the inner wall of the side span steel box arch is connected to a stiffening rib, and the outer wall of the hollow seal body is connected to the side of the stiffening rib facing away from the side span steel box.

[0019] This solution provides one specific method for fixing the hollow seal to the side span steel box arch. This method facilitates the quick fixing of the hollow seal to the side span steel box arch and prevents the outer wall of the hollow seal from fitting against the inner wall of the side span steel box arch by using the width of the stiffening rib (its dimension along the normal direction of the inner wall of the side span steel box arch). This ensures that there is a gap between the outer wall of the hollow seal and the inner wall of the side span steel box arch.

[0020] Preferably, a support column is also connected between the bottom of the hollow sealing body and the inner wall of the side span steel box arch.

[0021] This solution provides one specific method for fixing the hollow seal body to the side span steel box arch. The support column can support the hollow seal body from the bottom up, thereby preventing the hollow seal body from moving downward under the load of gravity and the ballast concrete, which would cause the bottom of the hollow seal body to come into contact with the bottom plate of the side span steel box arch. At the same time, the support column will not completely obstruct the flow of the ballast concrete, thus preventing the formation of concrete cavities at the bottom of the hollow seal body.

[0022] Preferably, the number of hollow sealing bodies is at least four, and the hollow sealing bodies are distributed at intervals along the arch axis direction and the transverse direction of the side span steel box arch.

[0023] This scheme further breaks down the hollow sealing body into smaller parts, distributing them not only at intervals along the arch axis of the side span steel box arch, but also at intervals along the transverse direction of the bridge. On the one hand, this reduces the volume of a single hollow sealing body, thereby reducing the difficulty and cost of manufacturing and transporting the hollow sealing body. On the other hand, it also adds more control dimensions to the position adjustment of the hollow sealing body, thereby further improving the accuracy of this scheme in adjusting the center of gravity position of the counterweight concrete.

[0024] Preferably, the hollow sealing body is a steel component.

[0025] This solution ensures that the hollow seal has sufficient strength, preventing it from collapsing under the weight of the ballast concrete during pouring, and allowing it to work together with the ballast concrete to transfer loads after the ballast concrete is poured.

[0026] In a second aspect, the present invention provides a method for regulating the intensity of bridge ballast load, applied to a bridge ballast load intensity regulation structure of the present invention, comprising the following steps: S1. Based on the negative bending moment at the arch foot and the positive bending moment at mid-span, calculate the required weight and location distribution of the counterweight in the steel-concrete composite section; based on the weight and distribution of the counterweight, calculate the cavity volume and location distribution required when the concrete is fully distributed. S2. Install a hollow sealing body inside the side span steel box arch, and match the volume and position distribution of the hollow sealing body with the cavity volume and position distribution in step S1. S3. Pour counterweight concrete inside the steel box arch of the side span.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention provides a bridge counterweight load intensity control structure. By using a hollow sealing body to form a cavity within the counterweight concrete, the overall weight and center of gravity of the counterweight concrete can be precisely adjusted by changing the volume and position distribution of the hollow sealing body. Compared with the prior art, this invention can reduce the negative bending moment at the arch foot and the positive bending moment at mid-span, avoid the complex design of the sealed box structure and the corresponding pouring process, and improve construction flexibility and the counterweight efficiency of the counterweight concrete.

[0028] 2. This invention provides a method for controlling the intensity of bridge ballast load, which can be used to construct the bridge ballast load intensity control structure of this invention. Compared with the prior art, this invention has higher construction flexibility and can ensure with higher precision that the negative bending moment at the arch foot and the positive bending moment at mid-span meet the design requirements. Attached Figure Description

[0029] Figure 1 This is a side sectional view of a bridge load intensity control structure according to the present invention. Figure 1 ; Figure 2 This is a side sectional view of a bridge load intensity control structure according to the present invention. Figure 2 ; Figure 3 This is a partial top-view cross-sectional structural schematic diagram of a bridge ballast load intensity control structure according to the present invention. Figure 4 This is a side view of a hollow sealed body for adjusting the intensity of bridge ballast load according to the present invention. Figure 5 This is a schematic diagram of the cross-sectional structure of a hollow sealing body for bridge load intensity control according to the present invention at section AA. icon: 1-Side span steel box arch; 11-Stiffening rib; 2-Side span main beam; 3-Hollow sealed body; 4-Compressed concrete. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0031] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0032] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but that it can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0033] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0034] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as 2, 3, 4, 5, 6, 7, 8, or 9, and can even exceed nine.

[0035] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0036] Example 1 like Figures 1 to 5 As shown, a bridge counterweight load intensity control structure includes a side span steel box arch 1 and a side span main beam 2. The side span steel box arch 1 is the main component of the side arch under pressure. The side span main beam 2 is set above the side span steel box arch 1. Both the side span steel box arch 1 and the side span main beam 2 are filled with counterweight concrete 4 to balance the horizontal thrust of the arch foot. A hollow sealing body 3 is set inside the side span steel box arch 1. The hollow sealing body 3 is set near the end of the side span steel box arch 1 near the column support. At least two hollow sealing bodies 3 are distributed at intervals along the arch axis of the side span steel box arch 1. The hollow sealing body 3 is not filled with counterweight concrete 4.

[0037] exist Figures 1 to 5The design also uses a spatial rectangular coordinate system to mark each direction, where the X-axis represents the longitudinal direction of the bridge, the Y-axis represents the transverse direction of the bridge, and the Z-axis represents the height direction; the arch axis of the side span steel box arch 1 is located in the plane determined by the X-axis and Y-axis, and extends approximately along the X-axis direction; Figure 2 In order to more clearly identify the stiffening ribs 11 and other structures, the counterweight concrete 4 was concealed.

[0038] In optional embodiments, the specific structure of the hollow sealing body 3 includes, but is not limited to, a rectangular box structure, a wavy box structure, a column structure, or a tubular structure, as long as it can generate a concrete cavity without the filling of the counterweight concrete 4 in the side span steel box arch 1.

[0039] In an optional embodiment, the hollow sealing body 3 is a tubular component with end caps at both ends; the cross-sectional shape of the tubular component includes, but is not limited to, circular, elliptical or polygonal; the connection method between the end caps and the tubular component includes, but is not limited to, threaded connection, flange connection or welding connection, as long as the sealing inside the tubular component can be guaranteed.

[0040] In the above embodiments, the cross-sectional shape of the tubular component is circular or elliptical to improve stress concentration.

[0041] In the above embodiments, the tubular component is specifically a cylindrical steel pipe with a diameter of 800 mm and a thickness of 6 mm. The steel pipe is made of Q355C or higher grade steel to ensure that the tubular component has sufficient strength.

[0042] In an optional embodiment, the hollow sealing body 3 is divided into two groups along the arch axis of the side span steel box arch 1. The axial direction of the group of hollow sealing bodies 3 closer to the column support is perpendicular to the arch axis of the side span steel box arch 1, while the axial direction of the group of hollow sealing bodies 3 farther from the column support is perpendicular to the horizontal direction. For example Figure 2 As shown, Figure 2 The axial direction of the hollow sealed body 3 near the upper side is perpendicular to the arch axis of the side span steel box arch 1, and also perpendicular to the Y-axis; while Figure 2 The axial direction of the hollow sealing body 3 near the lower side is parallel to the Z-axis direction.

[0043] In an optional embodiment, the number of hollow sealing bodies 3 is at least four, and the hollow sealing bodies 3 are distributed at intervals along the arch axis direction and transverse direction of the side span steel box arch 1. For example Figure 3 As shown, multiple rows of hollow sealing bodies 3 are spaced apart along the arch axis of the side span steel box arch 1, and each row of hollow sealing bodies 3 includes at least two hollow sealing bodies 3 spaced apart along the transverse bridge direction.

[0044] In an optional embodiment, there is a gap between the outer wall of the hollow sealing body 3 and the inner wall of the side span steel box arch 1. For example, if the hollow sealing body 3 is a hexahedron, none of its six surfaces directly contact the inner wall of the side span steel box arch 1; if the hollow sealing body 3 is a cylinder, its cylindrical surface and two end faces do not directly contact the inner wall of the side span steel box arch 1.

[0045] In the above embodiments, the distance between the outer wall of the hollow sealing body 3 and the inner wall of the side span steel box arch 1 is greater than or equal to 15cm. This can both avoid reducing the weakening effect of the hollow sealing body 3 on the cross section of the side span steel box arch 1 considering the counterweight concrete 4, and ensure that the concrete can properly fill the area between the outer wall of the hollow sealing body 3 and the inner wall of the side span steel box arch 1.

[0046] In an optional embodiment, a stiffening rib 11 is connected to the inner wall of the side span steel box arch 1, and the outer wall of the hollow sealing body 3 is connected to the side of the stiffening rib 11 facing away from the side span steel box. For example Figure 2 As shown, longitudinal stiffening ribs 11 are provided along the arch axis of the side span steel box arch 1, and at least two stiffening ribs 11 are distributed at intervals along the height direction of the side span steel box arch 1. The hollow sealing body 3 is welded to the side of the stiffening rib 11 near the center of the side span steel box arch 1. At this time, the width of the stiffening rib 11 is the distance between the outer wall of the hollow sealing body 3 and the inner wall of the side span steel box arch 1.

[0047] In an optional embodiment, a support column is also connected between the bottom of the hollow sealing body 3 and the inner wall of the side span steel box arch 1. The specific structure of the support column includes, but is not limited to, steel bars, adjustable screw legs or diagonal bracing legs.

[0048] In an optional embodiment, the counterweight concrete 4 is C25 concrete.

[0049] Example 2 A method for controlling the intensity of bridge ballast load, applied to a bridge ballast load intensity control structure in Example 1, includes the following steps: S1. Based on the negative bending moment at the arch foot and the positive bending moment at mid-span, calculate the required weight and location distribution of the counterweight in the steel-concrete composite section; based on the weight and distribution of the counterweight, calculate the cavity volume and location distribution required when the concrete is fully distributed.

[0050] S2. Install a hollow sealing body 3 inside the side span steel box arch 1. The volume and position distribution of the hollow sealing body 3 match the cavity volume and position distribution in step S1.

[0051] S3. Pour counterweight concrete 4 inside the steel box arch 1 of the side span.

[0052] In an optional implementation, when the actual construction conditions differ from the design conditions, the installation position of the hollow sealing body 3 can be adjusted in step S2 according to the site conditions to ensure that the center of gravity of the counterweight concrete 4 meets the actual stress requirements of the swallow-shaped arch bridge.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bridge counterweight load intensity control structure, comprising a side span steel box arch (1), characterized in that, Also includes: Hollow sealing bodies (3) are installed inside the side span steel box arch (1). The hollow sealing bodies (3) are installed near the end of the side span steel box arch (1) near the column support. At least two hollow sealing bodies (3) are distributed at intervals along the arch axis of the side span steel box arch (1). The counterweight concrete (4) is filled between the side span steel box arch (1) and the hollow sealing body (3).

2. The bridge counterweight load intensity control structure according to claim 1, characterized in that, The hollow sealing body (3) is a tubular component, and end caps are provided at both ends of the tubular component.

3. The bridge counterweight load intensity control structure according to claim 2, characterized in that, The hollow sealing body (3) is divided into two groups along the arch axis of the side span steel box arch (1). The axial direction of the hollow sealing body (3) closer to the column support is perpendicular to the arch axis of the side span steel box arch (1), and the axial direction of the hollow sealing body (3) further away from the column support is perpendicular to the horizontal direction.

4. The bridge counterweight load intensity control structure according to claim 2, characterized in that, The cross-sectional shape of the tubular component is circular or elliptical.

5. A bridge counterweight load intensity control structure according to any one of claims 1 to 4, characterized in that, There is a gap between the outer wall of the hollow sealing body (3) and the inner wall of the side span steel box arch (1).

6. The bridge counterweight load intensity control structure according to claim 5, characterized in that, The inner wall of the side span steel box arch (1) is connected to a stiffening rib plate (11), and the outer wall of the hollow sealing body (3) is connected to the side of the stiffening rib plate (11) that is away from the side span steel box.

7. A bridge counterweight load intensity control structure according to claim 5, characterized in that, A support column is also connected between the bottom of the hollow sealing body (3) and the inner wall of the side span steel box arch (1).

8. A bridge counterweight load intensity control structure according to any one of claims 1 to 4, characterized in that, The number of hollow sealing bodies (3) is at least four, and the hollow sealing bodies (3) are distributed at intervals along the arch axis and transverse direction of the side span steel box arch (1).

9. A bridge counterweight load intensity control structure according to any one of claims 1 to 4, characterized in that, The hollow sealing body (3) is a steel component.

10. A method for controlling the intensity of bridge counterweight load, characterized in that, The bridge counterweight load intensity control structure according to any one of claims 1 to 9 includes the following steps: S1. Based on the negative bending moment at the arch foot and the positive bending moment at mid-span, calculate the required weight and location distribution of the counterweight in the steel-concrete composite section; based on the weight and distribution of the counterweight, calculate the cavity volume and location distribution required when the concrete is fully distributed. S2. Install a hollow sealing body (3) inside the side span steel box arch (1), wherein the volume and position distribution of the hollow sealing body (3) match the volume and position distribution of the cavity in step S1. S3. Pour counterweight concrete (4) inside the side span steel box arch (1).

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