Large-span bracket modeling continuous steel structure bridge girder block hoisting construction method

Abstract

The invention relates to a large-span bracket modeling continuous steel structure bridge girder block hoisting construction method. The method comprises the steps of steel structure support construction, wherein a steel structure support is installed on a main pier bearing platform; constructing an underwater steel structure bracket, and constructing a shore steel structure bracket; manufacturing bracket system modeling steel structures with irregular shapes in a blocking manner; dividing the bracket system modeling steel structures into bracket system modeling hoisting units with irregular shapes at non-main nodes; hoisting bracket set modeling steel structure beam bodies with irregular shapes by using a floating crane block by block; welding a plurality of longitudinal and transverse butt joints on a bracket; roof block hoisting comprises bulk stand columns, upper longitudinal beams, ridge beams and ridge cross braces. The large-span and large-dead-load steel structure bridge comprising the roof structure is formed through block hoisting and welding. The method has the effects of efficient construction, high-quality structure, safety, controllability and good benefit.

Description

Technical Field

[0001] The invention relates to a method for constructing a main beam of a steel structure bridge, in particular to a method for hoisting a main beam of a large-span bucket-shaped continuous steel structure bridge including a roof structure in blocks. Background Art

[0002] With the rapid development of construction technology and society, the architectural appearance of bridges is more beautiful and the structural stress is more innovative. The existing construction technology of the three-span continuous collaborative system bridge of "hollow truss + longitudinal and transverse stacked beam" in the shape of "dougong + octagonal gate" is also involved in CN115772847A. There are some problems in the process of stacking and assembling the rods of common steel structure stacked beams: people often pay attention to the assembly of rods and ignore the effective welding of nodes, and the nodes are the main stress nodes. If any node is unstable, it will be damaged first, and the adjacent nodes will be damaged one after another. During the installation process, there is a large cumulative error risk and welding stress from the basic unit to the larger unit and then to the overall unit, and there are no specific measures for the cumulative error and welding stress problems. The present invention provides a block-by-block hoisting construction method for the main beam of a large-span dougong-shaped continuous steel structure bridge including a roof structure, which can effectively solve the above problems. Summary of the invention

[0003] The purpose of the present invention is to provide a method for the block-by-block hoisting construction of a large-span continuous steel structure bridge main beam including a roof structure, so as to solve the problem that the common steel structure stacked beam attaches importance to the assembly of the rods but ignores the effective welding of the nodes during the rod stacking process. It further solves the problem of large cumulative error risks and welding stresses from the basic unit to the larger unit and then to the overall unit during the installation process.

[0004] In order to solve the above technical problems, the technical solutions provided by the present invention are as follows: 1. A method for the block-by-block hoisting construction of a main beam of a large-span continuous steel structure bridge with a bucket-shaped shape, characterized in that it comprises: construction of a steel structure support: installing a steel structure support on a main pier cap; construction of an underwater steel structure support and a shore steel structure support; block-by-block production of a bucket-shaped steel structure with an irregular shape: dividing it into bucket-shaped hoisting units with irregular shapes at non-main nodes; adopting floating hoisting to block-by-block hoisting of a bucket-shaped steel structure beam with an irregular shape: welding a plurality of longitudinal and transverse butt joints on the support; block-by-block hoisting of a roof, including bulk columns, upper longitudinal beams, ridge beams, and ridge cross braces. The specific steps of the hoisting construction method are as follows:

[0005] Step 1: Construction of steel structure support foundation, select pile foundation, existing bridge foundation or expanded foundation according to different address environments;

[0006] Step 2: Install the steel structure support, install the steel pipe columns, install the connecting beams between the steel pipe columns, install the double-layer steel distribution beams, and set the steel pier supports;

[0007] Step 3: Hoist the irregularly shaped steel beam of the bracket, temporarily fix it on the bracket, and then weld the divided beams vertically and horizontally into a whole;

[0008] Step 4: Install the columns and mechanically connect the columns to the short columns reserved for the stacked beams;

[0009] Step 5: Install the upper longitudinal beam, weld the lower end of the column and the reserved short column of the stacked beam. Weld between the columns and the ends of the upper longitudinal beam;

[0010] Step 6: Set up the temporary bracket for the bridge face, hoist the ridge beam in sections and weld them;

[0011] Step 7: Hoist the ridge brace and weld both ends of the ridge brace.

[0012] Furthermore, the steel structure support is used to support the bucket-shaped steel structure beam body that is hoisted in blocks; the setting of the steel structure support is divided into different foundation forms according to the longitudinal and transverse segmentation positions of the hoisted beam body and the geological environment in which it is located; the foundation forms of the steel structure support include steel pipe pile foundation in water areas, using the main pier cap of the bridge as the foundation, and expanding the foundation under the steel pipe column on land.

[0013] Furthermore, the steel tube column is provided with a transverse steel connecting cross brace to increase the stability of the bracket, and a double-layer steel distribution beam is arranged on the top of the steel tube column; the lower layer of steel distribution beam is arranged along the bridge direction, and the upper layer of steel distribution beam is arranged transverse to the bridge direction, and the upper layer of steel distribution beam is installed below the stress node of the irregular-shaped lifting beam body; a steel pier support is arranged above the upper layer of distribution beam, and the steel pier support is arranged at the stress node of the irregular-shaped bracket-shaped lifting beam body, and the steel pier support is a support system that can automatically drop the frame.

[0014] Furthermore, the irregular-shaped bracket-shaped steel structure beam is composed of a large-span and large-constant-load steel structure stacked beam system through longitudinal stacked beams, transverse stacked beams, hidden columns, main longitudinal beams, bridge deck panels, and reserved short columns; after longitudinal, transverse and vertical segmentation, an independent unit that meets the transportation and lifting requirements is formed.

[0015] Furthermore, the irregular-shaped bracket-shaped steel structure beam is composed of multiple layers of longitudinal and transverse stacked beams that gradually decrease in length from bottom to top; the irregular-shaped bracket-shaped steel structure beam is processed and transported on a frame and is separated from the frame during hoisting.

[0016] Furthermore, floating crane is used to lift the irregular-shaped steel structure beams in blocks, and lifting balance is achieved by adjusting the length of the slings and adding or removing U-shaped clamps. First, the center of gravity of the irregular-shaped steel structure beams is calculated, and then plate lifting ears for lifting are set at firm positions on both sides of the center and corresponding stiffening plates are welded. The irregular-shaped steel structure beams installed at the bridge position are temporarily connected and fixed with code plates to ensure their stability.

[0017] Furthermore, the roof is hoisted in blocks by means of loose parts hoisting, and the hoisting equipment is a floating crane or ground lifting equipment; the columns and the reserved short columns of the stacked beams are first mechanically fixed by connecting plates and connecting bolts, and after the upper longitudinal beams and columns are hoisted into place by using upper longitudinal beam yard plates, the columns and stacked beams, and the columns and upper longitudinal beams are welded separately; a bridge temporary bracket is set up to install the ridge beams in sections, and the ridge cross braces are hoisted and connected to the ridge beams and upper longitudinal beams at both ends by using ridge cross brace yard plates for positioning and connection, and then welding is carried out; the lower distribution beam of the ridge bracket is on the main longitudinal beam of the stacked beam, and the two columns and the column cross brace form a vertical bearing structure, and two short steel support ridge beams are arranged above the upper distribution beam, and transverse stabilizing diagonal braces and longitudinal stabilizing supports are arranged to keep the bracket stable.

[0018] Furthermore, the main beam of the large-span bracket-shaped continuous steel structure bridge has a stacked beam system, a frame system and a roof. The steel structures of each component are subjected to stress in a coordinated manner, and each cross node of the rods is a stress node; the entire bridge is divided into many lifting units, and the complex parts are unified into a whole for processing, manufacturing, transportation and installation; the roof structure that is prone to deformation and makes installation difficult is split into individual rods in bulk; the stacked beam body is divided into blocks to take into account the super-height restrictions during water transportation from the steel structure processing plant to the installation site and the lifting capacity restrictions of the floating crane during on-site installation; the longitudinal beams are disconnected in the direction of the bridge, the transverse beams are disconnected in the direction of the bridge, and the vertical columns are disconnected near the roots, and the block cutting lines avoid the main stress nodes of the entire steel structure.

[0019] The beneficial effects of the present invention are:

[0020] The present invention provides a method for lifting the main beam of a large-span continuous steel structure bridge in blocks including a roof structure, which can solve the problems of low installation efficiency, poor installation accuracy and loss of mechanical properties of common steel structure stacked beams.

[0021] The invention provides a method for the block-by-block hoisting construction of a large-span bucket-arch continuous steel structure bridge main beam including a roof structure, which embodies the joint stress characteristics of a continuous cooperative system.

[0022] This large-span, high-constant-load bridge has a stacked-beam system, a frame system and a roof. The steel structures of the various components are subjected to stress in a coordinated manner, and the intersection nodes of each member are the main stress nodes. The entire bridge is divided into many lifting units, and the complex parts are unified into a larger whole for processing, manufacturing, transportation and installation. The roof structure, which is prone to deformation and difficult to install, is split into individual members for bulk installation. The stacked-beam body is divided into blocks to take into account the super-height restrictions during water transportation from the steel structure processing plant to the installation site and the lifting capacity restrictions of the floating crane during on-site installation. The blocks are disconnected along the longitudinal beams in the direction of the bridge, the transverse beams in the direction of the bridge, and near the roots of the vertical columns, and the block cutting lines avoid the main stress nodes of the entire steel structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of a large-span bucket-arch-shaped continuous steel structure bridge main beam and steel structure support including the roof structure;

[0024] Figure 2 It is the layout drawing of steel structure support;

[0025] Figure 3 This is a detailed structural diagram of a typical stacked beam block;

[0026] Figure 4 It is a schematic diagram of bulk columns;

[0027] Figure 5 This is the schematic diagram of the upper longitudinal beam installation;

[0028] Figure 6 It is the layout diagram of the ridge beam in bulk and the brackets;

[0029] Figure 7 This is the installation diagram of the ridge beam cross brace. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings. It should be noted that the drawings are all in a very simplified form and use non-precise proportions. They are only a representative part of the present invention and can demonstrate the characteristics of the present invention.

[0031] like Figures 1 to 7As shown, an embodiment of the present invention provides a method for lifting and constructing a main beam of a large-span continuous steel structure bridge with a bracket shape including a roof structure, comprising: constructing a steel structure support 1: installing the steel structure support on the main pier pedestal, constructing the underwater steel structure support, and constructing the onshore steel structure support; making a bracket shape steel structure beam body 2 in blocks: dividing it into bracket shape lifting units with irregular shapes at non-main nodes; lifting the bracket shape steel structure beam body with irregular shapes in blocks by floating lifting: welding multiple longitudinal and transverse butt joints on the support; lifting the roof in blocks, including bulk columns 3, upper longitudinal beams 4, ridge beams 5, and ridge cross braces 6.

[0032] The steel structure support 1 is used to support the bucket-shaped steel structure beam body that is hoisted in blocks; the setting of the steel structure support 1 is divided into different foundation forms according to the longitudinal and transverse segmentation positions of the hoisted beam body and the geological environment in which it is located; the foundation forms of the steel structure support 1 include steel pipe pile foundation in water area, using the main pier cap of the bridge as the foundation, and expanding the foundation under the steel pipe column 11 on land; the steel pipe column 11 is provided with a transverse steel connecting cross brace 12 to increase the stability of the support, and a double-layer steel distribution beam is arranged on the top of the steel pipe column 11; the lower layer of steel distribution beam 13 is arranged along the bridge direction, and the upper layer of steel distribution beam 14 is arranged transverse to the bridge direction, and the upper layer of steel distribution beam is installed below the main force-bearing node of the irregular hoisting beam body; a steel pier support is arranged above the upper layer of distribution beam, the steel pier support 15 is the main force-bearing support, the steel pier support 16 is the secondary force-bearing support, and the steel pier support 17 is only used for stacked beam installation. The steel pier support is arranged at the main stress-bearing nodes of the hoisting beam body corresponding to the irregular-shaped bracket. The steel pier support 16 is a support system that can be automatically dropped.

[0033] The block-made bracket-shaped steel structure beam 2 is composed of a large-span and large-constant-load steel structure stacked beam system, which is composed of longitudinal stacked beams 21, transverse stacked beams 22, hidden columns 23, main longitudinal beams 24, bridge decks 26, and reserved short columns 25; it is an independent unit that meets the requirements of transportation and lifting after longitudinal, transverse and vertical segmentation.

[0034] The irregular-shaped steel structure beam is composed of multiple layers of longitudinal and transverse stacked beams that gradually decrease in length from bottom to top; the irregular-shaped bracket-shaped steel structure beam is processed and transported on a frame and is separated from the frame during hoisting.

[0035] The irregular steel structure beam is hoisted by floating crane, and the hoisting balance is achieved by adjusting the length of the sling and adding or removing U-shaped clamps; the center of gravity of the irregular bucket-arch steel structure beam is obtained by calculation, and plate-type lifting ears 27 for hoisting are set at firm positions on both sides of the center and corresponding stiffening plates are welded; the irregular bucket-arch steel structure beams installed at the bridge position are temporarily connected and fixed with code plates to ensure their stability.

[0036] The roof structure is hoisted in parts, and the hoisting equipment is floating crane or ground lifting equipment; the columns and the reserved short columns of the stacked beams are first mechanically fixed with connecting plates 31 and connecting bolts 32, and the upper longitudinal beams and columns are connected in place with upper longitudinal beam code plates 41, and then the columns 3 and stacked beams 2, and the columns 3 and upper longitudinal beams 4 are respectively welded; the bridge face temporary bracket is set up to install the ridge beam 5 in sections, and the ridge cross brace 6 is hoisted and the ridge beams 5 and upper longitudinal beams 4 at both ends are first positioned and connected with the ridge cross brace code plates 61, and then welded. The lower distribution beam 51 of the ridge bracket is manufactured on the stacked beam main longitudinal beam 24, and two columns 52 and column cross braces 53 form a vertical bearing structure. Two short steels are set above the upper distribution beam 54 to support the ridge beam 5, and horizontal stable diagonal braces 55 and longitudinal stable supports 56 are set to keep the bracket stable.

[0037] The invention provides a method for the block-by-block hoisting construction of a large-span bucket-arch continuous steel structure bridge main beam including a roof structure, which embodies the joint stress characteristics of a continuous cooperative system.

[0038] This large-span, high-constant-load bridge has a stacked-beam system, a frame system and a roof. The steel structures of the various components are subjected to stress in a coordinated manner, and the intersection nodes of each member are the main stress nodes. The entire bridge is divided into many lifting units, and the complex parts are unified into a larger whole for processing, manufacturing, transportation and installation. The roof structure, which is prone to deformation and difficult to install, is split into individual members for bulk installation. The stacked-beam body is divided into blocks to take into account the super-height restrictions during water transportation from the steel structure processing plant to the installation site and the lifting capacity restrictions of the floating crane during on-site installation. The blocks are disconnected along the longitudinal beams in the direction of the bridge, the transverse beams in the direction of the bridge, and near the roots of the vertical columns, and the block cutting lines avoid the main stress nodes of the entire steel structure.

[0039] An embodiment of the present invention provides a method for hoisting a main beam of a large-span continuous steel structure bridge with a bracket shape including a roof structure in sections, and the specific steps are as follows:

[0040] Step 1: Construction of support foundation, select pile foundation, existing bridge foundation or expanded foundation according to different address environments;

[0041] Step 2: Install the bracket, install the steel pipe column, install the connecting beam between the steel pipe columns, install the double-layer steel distribution beam, and set the steel pier support;

[0042] Step 3: Hoist the irregular steel structure beam, temporarily fix it on the bracket, and then weld the divided beams vertically and horizontally into a whole;

[0043] Step 4: Install the columns and mechanically connect the columns to the short columns reserved for the stacked beams;

[0044] Step 5: Install the upper longitudinal beam, weld the lower end of the column and the reserved short column of the stacked beam. Weld between the columns and the ends of the upper longitudinal beam;

[0045] Step 6: Set up the temporary bracket for the bridge face, hoist the ridge beam in sections and weld them;

[0046] Step 7: Hoist the ridge brace and weld both ends of the ridge brace.

Claims

1. A method for the block-by-block hoisting construction of a large-span bucket-arch continuous steel structure bridge main beam, characterized in that: include: Steel structure support construction: install steel structure support on the main pier cap; construct underwater steel structure support and onshore steel structure support; The irregular-shaped bucket-arch steel structure is made in blocks: it is divided into irregular-shaped bucket-arch hoisting units at non-main nodes; the irregular-shaped bucket-arch steel structure beam is hoisted in blocks by floating hoisting: multiple longitudinal and transverse butt joints are welded on the bracket; the roof is hoisted in blocks, including bulk columns, upper longitudinal beams, ridge beams, and ridge cross braces. The specific steps of this hoisting construction method are as follows: Step 1: Construction of steel structure support foundation, select pile foundation, existing bridge foundation or expanded foundation according to different address environments; Step 2: Install the steel structure support, install the steel pipe columns, install the connecting beams between the steel pipe columns, install the double-layer steel distribution beams, and set the steel pier supports; Step 3: Hoist the irregularly shaped steel beam of the bracket, temporarily fix it on the bracket, and then weld the divided beams vertically and horizontally into a whole; Step 4: Install the columns and mechanically connect the columns to the short columns reserved for the stacked beams; Step 5: Install the upper longitudinal beam, weld the lower end of the column and the reserved short column of the stacked beam. Weld between the columns and the ends of the upper longitudinal beam; Step 6: Set up the temporary bracket for the bridge face, hoist the ridge beam in sections and weld them; Step 7: Hoist the ridge brace and weld both ends of the ridge brace.

2. The method for hoisting the main beam of a large-span continuous steel structure bridge with bracket shape according to claim 1 is characterized in that: The steel structure support is used to support the bucket-shaped steel structure beams that are hoisted in blocks; the setting of the steel structure support is divided into different foundation forms according to the longitudinal and transverse segmentation positions of the hoisted beams and the geological environment; the foundation forms of the steel structure support include steel pipe pile foundation in water areas, using the main pier cap of the bridge as the foundation, and expanding the foundation under the steel pipe column on land.

3. The method for hoisting the main beam of a large-span continuous steel structure bridge with bracket shape according to claim 2 is characterized in that: The steel tube column is provided with a transverse steel connecting cross brace to increase the stability of the bracket, and a double-layer steel distribution beam is arranged on the top of the steel tube column; the lower layer of steel distribution beam is arranged along the bridge direction, and the upper layer of steel distribution beam is arranged transverse to the bridge direction, and the upper layer of steel distribution beam is installed below the stress node of the irregular-shaped hoisting beam body; a steel pier support is arranged above the upper layer of distribution beam, and the steel pier support is arranged at the stress node of the irregular-shaped bucket arch hoisting beam body, and the steel pier support is a support system that can automatically drop the frame.

4. The method for hoisting the main beam of a large-span continuous steel structure bridge with bracket shape according to claim 1 is characterized in that: The irregular-shaped bracket-shaped steel structure beam is composed of a large-span, large-constant-load steel structure stacked beam system, which is composed of longitudinal stacked beams, transverse stacked beams, hidden columns, main longitudinal beams, bridge deck panels, and reserved short columns. After longitudinal, transverse and vertical segmentation, it forms an independent unit that meets the requirements of transportation and lifting.

5. The method for hoisting the main beam of a large-span continuous steel structure bridge with bracket shape according to claim 1 is characterized in that: The irregular-shaped bucket-arch steel structure beam is composed of multiple layers of longitudinal and transverse stacked beams that gradually decrease in length from bottom to top; the irregular-shaped bucket-arch steel structure beam is processed and transported on a frame and is separated from the frame during hoisting.

6. The method for hoisting the main beam of a large-span continuous steel structure bridge with bracket shape according to claim 1 is characterized in that: The irregular-shaped bucket-arch steel structure beams are hoisted in blocks using floating cranes, and the lifting balance is achieved by adjusting the length of the slings and adding or removing U-shaped clamps. First, the center of gravity of the irregular-shaped bucket-arch steel structure beams is calculated, and then plate lifting ears for lifting are set at firm positions on both sides of the center and corresponding stiffening plates are welded. The irregular-shaped bucket-arch steel structure beams installed at the bridge position are temporarily connected and fixed with code plates to ensure their stability.

7. The method for hoisting the main beam of a large-span continuous steel structure bridge with bracket shape according to claim 1 is characterized by: The roof is hoisted in blocks by means of loose parts hoisting, and the hoisting equipment is floating crane or ground lifting equipment; the columns and the reserved short columns of the stacked beams are first mechanically fixed with connecting plates and connecting bolts, and the upper longitudinal beams and columns are connected in place with upper longitudinal beam stock plates before welding the columns and stacked beams, and the columns and upper longitudinal beams are welded separately; a bridge temporary bracket is set up to install the ridge beams in sections, and the ridge cross braces are hoisted and connected to the ridge beams and upper longitudinal beams at both ends by ridge cross brace stock plates before welding; the lower distribution beam of the ridge bracket is on the main longitudinal beam of the stacked beam, and the two columns and the column cross brace form a vertical bearing structure, and two short steel support ridge beams are arranged above the upper distribution beam, and horizontal stabilizing diagonal braces and longitudinal stabilizing supports are arranged to keep the bracket stable.

8. The method for hoisting the main beam of a large-span continuous steel structure bridge with bracket shape according to claim 1 is characterized in that: The main beam of this large-span bracket-shaped continuous steel structure bridge has a stacked beam system, a frame system and a roof. The steel structures of each component are subjected to stress in a coordinated manner, and each cross node of the rods is a stress node. The entire bridge is divided into many lifting units, and the complex parts are unified into a whole for processing, manufacturing, transportation and installation. The roof structure, which is prone to deformation and difficult to install, is split into individual rods for bulk installation. The stacked beam body is divided into blocks to take into account the super-height restrictions during water transportation from the steel structure processing plant to the installation site and the lifting capacity restrictions of the floating crane during on-site installation; the longitudinal beams are disconnected in the direction of the bridge, the transverse beams are disconnected in the direction of the bridge, and the vertical columns are disconnected near the roots. The block cutting lines avoid the main stress nodes of the entire steel structure.

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