Method for installing steel box girder of overwater vertical lifting movable bridge

Abstract

The invention provides a mounting method for steel box girders of an overwater vertical lifting movable bridge. The mounting method comprises the steps that S1, the steel box girders for the vertical lifting movable bridge are sequentially divided into a plurality of first section steel box girders, a plurality of second section steel box girders and a plurality of third section steel box girders according to construction conditions, transportation requirements, lifting conditions and standard requirements; s2, a plurality of second-section steel box girders are transported to the designated position on site for secondary assembly, and then the second-section steel box girders enter the water and are transported and towed to the designated position in a floating mode; and S3, the first section of steel box girder and the third section of steel box girder are hoisted at the original positions of the site, and the second section of steel box girder is hoisted through first hoisting equipment on the first section of steel box girder and second hoisting equipment on the third section of steel box girder. By means of the method that the steel box girder is subjected to sectional secondary assembly, launching floating transportation towing and lifting, the difficult problem of the large steel box girder in the transportation process is effectively solved, and the difficult problem that a support cannot be erected in a channel during steel box girder construction is effectively solved.

Description

Technical Field

[0001] This application relates to the field of bridges, and particularly to a method for installing steel box girders of a vertical lifting opening bridge on water. Background Art

[0002] An opening bridge refers to a bridge whose superstructure can open and close in ways such as vertical rotation, horizontal rotation, and lifting for navigation needs. When land transportation becomes extremely busy and there are ships navigating on a river while a fixed bridge cannot be built above the navigable clearance, an opening bridge needs to be constructed to solve the water and land transportation problems. When a ship needs to cross the river, the bridge traffic is suspended, the bridge body of the opening bridge is lifted, and after the ship has crossed the river, the bridge body of the opening bridge is lowered to resume the entire bridge traffic.

[0003] To not affect the passage of the original river course and the environmental protection of the river course, and to ensure the normal navigation of the river course and the integrity of the river slope protection, the overall lifting method is generally used to install the steel box girder. When using the overall lifting method to install the steel box girder, the overall steel box girder to be lifted is too large to be transported, and the site in the water is restricted; in addition, to ensure the passage of the waterway, supports cannot be set directly below the lifting points. Summary of the Invention

[0004] This application provides a method for installing steel box girders of a vertical lifting opening bridge on water, aiming to solve the problem that the existing steel box girder transportation method cannot meet the requirements of on-site water installation without blocking the navigation of the waterway.

[0005] The technical solution of this application is as follows:

[0006] A method for installing steel box girders of a vertical lifting opening bridge on water includes the following steps:

[0007] S1. According to the actual construction conditions, transportation requirements, lifting conditions on-site, and the requirements of relevant specifications, the steel box girders of the vertical lifting opening bridge are sequentially divided into multiple first-section steel box girders, multiple second-section steel box girders, and multiple third-section steel box girders.

[0008] S2. Transport multiple of the second-section steel box girders to the designated on-site location for secondary assembly, then launch them into the water and tow them by floating to the designed location.

[0009] S3. Hoist the first-section steel box girders and the third-section steel box girders at their original on-site positions respectively; install a first lifting device on the first-section steel box girder and a second lifting device on the third-section steel box girder; hoist the second-section steel box girder at the designed location by means of the first lifting device and the second lifting device.

[0010] As a technical solution of the present application, in step S1, the steel box girder for the vertical lifting and opening bridge is segmented according to the distance between the steel cofferdams, the cantilever length of the lifting truss on the steel box girder for the vertical lifting and opening bridge, and the length of the steel box girder for the vertical lifting and opening bridge.

[0011] As a technical solution of the present application, in step S2, it includes the following steps:

[0012] S21, transporting the second-section steel box girder to the site in sections for secondary assembly, assembling and welding multiple second-section steel box girders into a whole on the jig for secondary assembly; moving the shipyard trolley to the lower part of the second-section steel box girder after secondary assembly, raising the shipyard trolley, jacking up the second-section steel box girder and detaching it from the jig, and then transporting it as a whole to the docking platform at the launching site in the inland river area;

[0013] S22, moving the inclined ship frame upward to directly below the second-section steel box girder; jacking up the jack until the second-section steel box girder is jacked from the shipyard trolley onto the inclined ship frame, and then withdrawing the shipyard trolley;

[0014] S23, moving the inclined ship frame downward, bringing the second-section steel box girder into the water together until the second-section steel box girder floats after reaching the draft depth;

[0015] S24, using a tugboat to tow the second-section steel box girder in a floating state to the designed position of the opening bridge to be constructed.

[0016] As a technical solution of the present application, in step S21, both ends of the second-section steel box girder after secondary assembly are welded and sealed with thin steel plates to form a ship-shaped floating structure; a watertightness test is carried out on the welds of the ship-shaped floating structure to detect and repair the water leakage points.

[0017] As a technical solution of the present application, in step S3, a first lifting bracket and a second lifting bracket are respectively erected on both sides of the steel cofferdam. The first segment of the steel box girder is hoisted in place through the first lifting bracket, and the third segment of the steel box girder is hoisted in place through the second lifting bracket; a plurality of the hoisted first segments of the steel box girder are assembled and welded into a whole, and a plurality of the hoisted third segments of the steel box girder are assembled and welded into a whole; a first lifting truss is installed on the integrally welded first segment of the steel box girder, and a second lifting truss is installed on the integrally welded third segment of the steel box girder; a first lifting device is installed on the first lifting truss and debugging and trial lifting operations are carried out on the first lifting device, and a second lifting device is installed on the second lifting truss and debugging and trial lifting operations are carried out on the second lifting device; the second segment of the steel box girder is vertically lifted as a whole through the first lifting device and the second lifting device.

[0018] Advantages of the present application:

[0019] The present application provides a method for installing a steel box girder of a waterborne vertically lifting opening bridge. By means of the method of transporting, hoisting and lifting the steel box girder in segmented sections, the problems in the transportation process of large steel box girders are effectively solved. This method does not affect the passage of the original river course and the environmental protection of the river course, and can also ensure the normal navigation of the river course and the integrity of the river slope protection. Brief Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can also be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic diagram of the transportation of the second segment of the steel box girder provided by the embodiment of the present application;

[0022] Figure 2 It is a schematic diagram of the lifting of the second segment of the steel box girder provided by the embodiment of the present application;

[0023] Figure 3 It is a schematic diagram of the second segment of the steel box girder after lifting and in place provided by the embodiment of the present application.

[0024] Icons: 1 - First - section steel box girder; 2 - Second - section steel box girder; 3 - Third - section steel box girder; 4 - First lifting device; 5 - Second lifting device; 6 - Ship - dock trolley; 7 - Docking platform; 8 - Inclined ship - frame; 9 - First lifting bracket; 10 - Second lifting bracket; 11 - Steel cofferdam; 12 - Steel strand; 13 - First lifting truss; 14 - Second lifting truss. Detailed implementation manners

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0027] Embodiment:

[0028] Please refer to Figure 1 and, with reference to Figures 2 to 3 An installation method for a steel box girder of a water - borne vertical - lifting opening bridge is provided in an embodiment of the present application, including the following steps:

[0029] S1. According to the actual construction conditions, transportation requirements, lifting conditions on - site, and requirements of specifications, the steel box girders of the vertical - lifting opening bridge are sequentially divided into multiple first - section steel box girders 1, multiple second - section steel box girders 2, and multiple third - section steel box girders 3;

[0030] S2. Transport multiple second - section steel box girders 2 to the designated position on - site for secondary assembly, then launch them into the water and tow them by floating to the design position;

[0031] S3. Hoist the first - section steel box girders 1 and the third - section steel box girders 3 at their original positions on - site respectively; install the first lifting device 4 on the first - section steel box girder 1 and the second lifting device 5 on the third - section steel box girder 3; hoist the second - section steel box girder 2 at the design position through the first lifting device 4 and the second lifting device 5.

[0032] In step S1, the steel box girders of the vertical - lifting opening bridge are segmented according to the spacing of the steel cofferdams 11, the overhanging length of the lifting trusses on the steel box girders of the vertical - lifting opening bridge, and the length of the steel box girders of the vertical - lifting opening bridge.

[0033] In step S2, it includes the following steps:

[0034] S21. Transport the multiple second - segment steel box girders 2 to the site in segments for secondary assembly. Assemble and weld the multiple second - segment steel box girders 2 into a whole on the jig for secondary assembly. Move the ship - building trolley 6 to the lower part of the second - segment steel box girder 2 after secondary assembly, raise the ship - building trolley 6, lift the second - segment steel box girder 2 and separate it from the jig, and then transport the whole to the docking platform 7 in the inner - river launching site. Specifically, in step S21, seal the two ends of the whole second - segment steel box girder 2 after secondary assembly with thin steel plates to form a ship - shaped floating structure, and transport this whole steel box girder to directly below the designed lifting position, thus effectively solving the problem of transporting large - sized steel box girders during the transportation process. Conduct a watertight test on the welds of the ship - shaped floating structure to detect and repair the water leakage points.

[0035] S22. Move the inclined ship - frame 8 up to directly below the second - segment steel box girder 2. Jack up the jack until the second - segment steel box girder 2 is lifted from the ship - building trolley 6 onto the inclined ship - frame 8, and then remove the ship - building trolley 6.

[0036] S23. Lower the inclined ship - frame 8, bring the second - segment steel box girder 2 into the water together until the second - segment steel box girder 2 floats up after reaching the draft depth.

[0037] S24. Use a tugboat to tow the second - segment steel box girder 2 in a floating state to the designed position.

[0038] In step S3, a first lifting bracket 9 and a second lifting bracket 10 are respectively erected on both sides of the steel cofferdam 11. The first segment of the steel box girder 1 is hoisted in place through the first lifting bracket 9, and the third segment of the steel box girder 3 is hoisted in place through the second lifting bracket 10. Multiple already-hoisted first segments of the steel box girder 1 are assembled and welded into a whole as a counterweight to resist the overturning moment during lifting, and multiple already-hoisted third segments of the steel box girder 3 are assembled and welded into a whole as a counterweight to resist the overturning moment during lifting, so that during the process of lifting the second segment of the steel box girder 2, the anti-overturning moment is completely provided by the steel box girder itself, solving the problem in the prior art that the concrete main tower participates in the force. A first lifting truss 13 is installed on the first segment of the steel box girder 1 welded into a whole, and a second lifting truss 14 is installed on the third segment of the steel box girder 3 welded into a whole. A first lifting device 4 is installed on the first lifting truss 13 and debugging and trial-lifting operations are carried out on the first lifting device 4. A second lifting device 5 is installed on the second lifting truss 14 and debugging and trial-lifting operations are carried out on the second lifting device 5. The first lifting device 4 and the second lifting device 5 are respectively connected to the lifting lugs on the second segment of the steel box girder 2 through steel strands 12, and the second segment of the steel box girder 2 is vertically lifted integrally through the first lifting device 4 and the second lifting device 5. It vertically lifts the second segment of the steel box girder 2 integrally through the first lifting device 4 on the first segment of the steel box girder 1 and the second lifting device 5 on the third segment of the steel box girder 3, without the need to add additional brackets, solving the problem that brackets cannot be erected below during the installation of the steel box girder across the river channel.

[0039] It should be noted that in this embodiment, both the first lifting device 4 and the second lifting device 5 can adopt the driving mechanisms in the prior art, and their specific structures and working principles will not be elaborated here.

[0040] The above method is applied to the construction of the steel box girder for an actual vertical-lifting opening bridge. Specifically, in this embodiment, the steel box girder for the vertical-lifting opening bridge is successively divided into the first segment of the steel box girder 1 with a total of 16 small segments, the second segment of the steel box girder 2 with a total of 32 small segments, and the third segment of the steel box girder 3 with a total of 16 small segments. Among them, the total length of the steel box girder for the vertical-lifting opening bridge is 104 m and the width is 34 m. Since the net distance between the steel cofferdams 11 is 75 m, if the second segment of the steel box girder 2 is too long as a whole, the bending moments borne by the first lifting truss 13 and the second lifting truss 14 during lifting are small, which will cause the second segment of the steel box girder 2 to be difficult to be in place and easy to collide with the steel cofferdam 11. If the second segment of the steel box girder 2 is too short as a whole, the bending moments borne by the first lifting truss 13 and the second lifting truss 14 during lifting are large, and the second segment of the steel box girder 2 will not collide with the cofferdam when in place. Therefore, after comprehensive consideration, the second segment of the steel box girder 2 is divided into 67.5 m in length.

[0041] In summary, the present application provides a method for installing a steel box girder of a water vertical lifting opening bridge. By means of transporting, hoisting, and lifting the steel box girder in segmented sections, the problems of large steel box girders during transportation are effectively solved. This method does not affect the passage of the original river course and the environmental protection of the river course, and can also ensure the normal navigation of the river course and the integrity of the river slope protection.

[0042] The foregoing is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A method for installing a steel box girder of a waterborne vertical lifting and opening bridge, characterized in that It includes the following steps: S1. According to the actual on-site construction conditions, transportation requirements, lifting conditions and specification requirements, the steel box girders of the vertical lifting opening bridge are successively divided into multiple first-section steel box girders, multiple second-section steel box girders and multiple third-section steel box girders; S2. Transport multiple of the second-section steel box girders to the designated on-site position for secondary assembly, then launch them into the water and tow them by floating to the design position; S3. Hoist the first-section steel box girders and the third-section steel box girders at their original on-site positions respectively; Install a first lifting device on the first-section steel box girder and a second lifting device on the third-section steel box girder; Hoist the second-section steel box girder at the design position by means of the first lifting device and the second lifting device.

2. The installation method of the steel box girder of the waterborne vertical lifting and opening bridge according to claim 1, characterized in that In step S1, the steel box girders of the vertical lifting opening bridge are segmented according to the distance between the steel cofferdams, the overhanging length of the lifting truss on the steel box girders of the vertical lifting opening bridge, and the length of the steel box girders of the vertical lifting opening bridge.

3. The installation method of the steel box girder of the waterborne vertical lifting and opening bridge according to claim 1, characterized in that, In step S2, it includes the following steps: S21. Transport the second-section steel box girders to the site in sections for secondary assembly. Assemble and weld multiple of the second-section steel box girders into a whole on the secondary assembly jig; Drive the shipyard trolley to the lower part of the second-section steel box girders after secondary assembly, raise the shipyard trolley, lift the second-section steel box girders and separate them from the jig, and then transport them as a whole to the docking platform of the inner river water area launching site; S22. Move the inclined ship frame up to the directly below of the second-section steel box girder; Jack up the jack until the second-section steel box girder is jacked from the shipyard trolley onto the inclined ship frame, and then withdraw the shipyard trolley; S23. Lower the inclined ship frame, bring the second-section steel box girder into the water together until the second-section steel box girder floats up after reaching the draft depth; S24. Use a tugboat to tow the floating second-section steel box girder to the designated position of the to-be-constructed opening bridge.

4. The method for installing the steel box girder of the waterborne vertical lifting and opening bridge according to claim 3, characterized in that, In step S21, seal the two ends of the whole second-section steel box girder after secondary assembly by welding with thin steel plates to form a ship-shaped floating structure; Conduct a watertight test on the welds of the ship-shaped floating structure to detect and repair the water leakage points.

5. The installation method of the steel box girder of the water vertical lifting and opening bridge according to claim 1, characterized in that, In step S3, erect a first lifting support and a second lifting support on both sides of the steel cofferdam respectively. Hoist the first-section steel box girder in situ by means of the first lifting support, and hoist the third-section steel box girder in situ by means of the second lifting support; Assemble and weld multiple of the hoisted first-section steel box girders into a whole, and assemble and weld multiple of the hoisted third-section steel box girders into a whole; Install a first lifting truss on the first-section steel box girder welded into a whole, and install a second lifting truss on the third-section steel box girder welded into a whole; Install the first lifting device on the first lifting truss and conduct commissioning and trial lifting operations on the first lifting device, and install the second lifting device on the second lifting truss and conduct commissioning and trial lifting operations on the second lifting device; The second segment steel box girder is integrally vertically lifted by the first lifting device and the second lifting device.

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