Segmented pushing and sliding construction method for large-span hyperbolic steel connecting bridge crossing urban main road

Abstract

The invention discloses a segmented pushing and sliding construction method for a large-span hyperbolic steel connecting bridge crossing an urban main road, and the method comprises the steps: installing a plurality of supporting columns on the ground, and enabling the supporting columns to be arranged on the two opposite sides of the urban main road; a large-span operation platform is arranged on the multiple supporting columns; the large-span hyperbolic steel connecting bridge is divided into two side span sections and a middle span section in the length direction; a sliding rail arranged in the length direction of the large-span operation platform is laid on the large-span operation platform; a plurality of subsection units of the middle section of one span are sequentially spliced at one end of the large-span operation platform, and after each subsection unit is spliced, the subsection units are pushed and slide to the construction positions corresponding to the subsection units through the sliding rails; after the middle section of the first span is in place, a side span section is assembled on the large-span operation platform; and connecting the side span section to the end part of the middle span section and the main body structure. According to the construction method, the problems that safety accidents are likely to happen and traffic jams are caused by a conventional method for constructing the steel connecting bridge on the urban main road are solved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a segmented pushing and sliding construction method for a large-span hyperbolic steel bridge across a city main road. Background Art

[0002] When constructing a super-long span hyperbolic steel bridge over a city's main roads and subway stations, the conventional approach is to close the city's main roads, then erect a temporary frame over the main roads for loose assembly, or use a large crawler crane for overall hoisting. During the construction of the steel bridge, the motor vehicle lane on the city's main roads needs to be occupied, which is prone to safety accidents and traffic congestion. Summary of the invention

[0003] In order to overcome the defects of the existing technology, a segmented jacking and sliding construction method for a large-span hyperbolic steel bridge across a city's main road is provided to solve the problem that the conventional practice of constructing steel bridges on city's main roads is prone to safety accidents and traffic congestion.

[0004] To achieve the above object, a segmented top-pushing and sliding construction method for a large-span hyperbolic steel bridge across a city trunk road is provided, comprising the following steps:

[0005] Installing a plurality of support columns on the ground below the construction location of the large-span hyperbolic steel bridge, wherein the plurality of support columns are arranged on opposite sides of the main urban road;

[0006] Installing Bailey frames on the plurality of support columns to form a large-span operating platform across the main urban road;

[0007] Dividing the long-span hyperbolic steel bridge into two side spans and a mid-span section along the length direction, wherein the mid-span section includes a plurality of segment units arranged along the length direction of the long-span hyperbolic steel bridge;

[0008] Laying a slide rail on the large-span operating platform along the length direction of the large-span operating platform;

[0009] At one end of the large-span operation platform, a plurality of segment units of the middle section of the span are sequentially assembled, and after each segment unit is assembled, the segment units are pushed and slid to the construction position corresponding to the segment unit by the slide rail, and after the plurality of segment units are slid into place, they are sequentially connected to the previous segment unit to form the middle section of the span;

[0010] After the middle section of the span is in place, assembling the side span sections on the large-span operating platform;

[0011] The side span section is connected to the end of the middle section of the first span and the main structure to form a long-span hyperbolic steel bridge.

[0012] Furthermore, the distance between the large-span operating platform and the ground is greater than 3m.

[0013] The beneficial effect of the present invention is that the segmented top-pushing and sliding construction method of the large-span hyperbolic steel bridge across the main urban road does not occupy the motor vehicle lane on the main urban road during the construction of the steel bridge, otherwise it is easy to cause safety accidents and traffic congestion. The Bailey frame operation platform is set up in a limited space, and the steel bridge is slid into place by using a hydraulic synchronous sliding construction process. The impact on the already operating subway, urban main roads and underground municipal pipelines is minimal, and the construction requirements of the subway special protection area are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0015] Figures 1 to 5 The present invention is a schematic diagram of the steps of a segmented jacking and sliding construction method for a large-span hyperbolic steel bridge across a city trunk road according to an embodiment of the present invention. DETAILED DESCRIPTION

[0016] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0017] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0018] Reference Figures 1 to 5 As shown, the present invention provides a segmented pushing and sliding construction method for a large-span hyperbolic steel bridge across a city main road, comprising the following steps:

[0019] S1. See Figure 1 A plurality of support columns 2 are installed on the ground below the construction position of the large-span hyperbolic steel bridge 1 , and the plurality of support columns 2 are arranged on opposite sides of the main urban road 5 .

[0020] S2. Continue reading Figure 1 A Bailey frame is installed on multiple supporting columns 2 to form a large-span operating platform 3 across the main urban road 5.

[0021] In this embodiment, the distance between the large-span operation platform 3 and the ground is greater than 3 m. The large-span operation platform formed by the Bailey frame will not affect the main roads of the city, ensuring the traffic on the main roads of the city.

[0022] S3. Divide the long-span hyperbolic steel bridge 1 into two side spans 11 (segment 1 and segment 6) and a span middle section 12 along the length direction. The span middle section 12 includes a plurality of segment units 121 arranged along the length direction of the long-span hyperbolic steel bridge 1.

[0023] S4. Lay a slide rail on the large-span operating platform 3 along the length direction of the large-span operating platform 3 .

[0024] S5. See Figures 2 to 4 At one end of the large-span operating platform 3, multiple segment units 121 (2 segments, 3 segments and 5 segments) of a mid-span section 12 are assembled in sequence, and after each segment unit 121 is assembled, it is pushed and slid to the corresponding construction position of the segment unit 121 through the slide rail. After the multiple segment units 121 slide into place, they are connected to the previous segment unit 121 in sequence to form a mid-span section.

[0025] S6. See Figure 5 After the middle section 12 of a span is in place, the side span section 11 is assembled on the large-span operating platform 3.

[0026] S7. Continue reading Figure 5 , the side span section 11 is connected to the end of the middle section of a span and the main structure 4 to form a long-span hyperbolic steel bridge 1.

[0027] The segmented top-pushing and sliding construction method of the large-span hyperbolic steel bridge across the main urban road of the present invention does not occupy the motor vehicle lane on the main urban road during the construction of the steel bridge, otherwise it is easy to cause safety accidents and traffic congestion. A Bailey frame operating platform is set up in a limited space, and the steel bridge is assembled on site by adopting a hydraulic synchronous sliding construction process to slide the steel bridge into place cumulatively. The impact on the already operating subway, urban main roads and underground municipal pipelines is minimal, and the construction requirements of the subway special protection area are met.

[0028] In this embodiment, the steel bridge spans the main urban road, and the subway station is located below the main urban road. The width of the main urban road is 40 meters, with 8 lanes in both directions and a span of 72.5 meters. The highest installation elevation of the steel bridge is 19.4 meters, and the net height below the steel bridge is 12.495 meters. The horizontal and vertical surfaces of the steel bridge are curved surfaces. The columns of the steel bridge are Y-shaped columns. Below the steel bridge are subway stations and bus stations, with high-voltage cables such as 220KV on the east side and 110KV on the west side. Temporary foundations are set up in the limited space on the east and west sides of the steel bridge, temporary support columns are erected, and a 3-meter-high super-large Bailey frame is set up as an operating platform. The "hydraulic synchronous sliding construction technology" is used to slide it into place cumulatively, solve the problem of not closing the road, and reduce the reinforcement of the complex pipelines of Dongxin Road and the stress load above the subway station caused by the steel bridge construction.

[0029] The segmented pushing and sliding construction method of the large-span hyperbolic steel bridge across the main urban road of the present invention is to comprehensively consider the on-site construction plane, the cross-sectional form of the steel bridge and the connection nodes, divide the steel bridge into 5 sections, set up temporary foundations in the limited space on the east and west sides of the bridge, erect temporary columns, and set up a 3-meter-high super-large Bailey frame as an operating platform. Sections 2, 3 and 5 are assembled in sections on the operating platform. After the sections are assembled, they are accumulated and slid into place using "hydraulic synchronous sliding construction technology".

[0030] The segmented top-pushing and sliding construction method of the large-span hyperbolic steel bridge across the main urban road of the present invention changes the traditional construction method of closing the main urban road, setting up a temporary tire frame above the main road for scattered assembly, or using a large crawler crane for overall lifting, reducing the impact of the construction of super-long and long-span hyperbolic steel bridge on the safety of urban public transportation. At the same time, it can also ensure the safety and controllability of on-site construction, saving construction time and costs.

[0031] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A segmented pushing and sliding construction method for a large-span hyperbolic steel bridge across a city main road, characterized in that: The following steps are involved: Installing a plurality of support columns on the ground below the construction location of the large-span hyperbolic steel bridge, wherein the plurality of support columns are arranged on opposite sides of the main urban road; Installing Bailey frames on the plurality of support columns to form a large-span operating platform across the main urban road; Dividing the long-span hyperbolic steel bridge into two side spans and a mid-span section along the length direction, wherein the mid-span section includes a plurality of segment units arranged along the length direction of the long-span hyperbolic steel bridge; Laying a slide rail on the large-span operating platform and arranged along the length direction of the large-span operating platform; At one end of the large-span operation platform, a plurality of segment units of the middle section of the span are sequentially assembled, and after each segment unit is assembled, the segment units are pushed and slid to the construction position corresponding to the segment unit by the slide rail, and after the plurality of segment units are slid into place, they are sequentially connected to the previous segment unit to form the middle section of the span; After the middle section of the span is in place, assembling the side span sections on the large-span operating platform; The side span section is connected to the end of the middle section of the first span and the main structure to form a long-span hyperbolic steel bridge.

2. The segmented pushing and sliding construction method for a large-span hyperbolic steel bridge across a city trunk road according to claim 1 is characterized in that: The distance between the large-span operating platform and the ground is greater than 3m.

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