Construction method for bridge floor steel beam sections of double-tower double-cable-plane steel-concrete composite beam cable-stayed bridge

Abstract

The invention relates to a double-tower double-cable-plane steel-concrete composite beam cable-stayed bridge deck steel beam section construction method, and belongs to the technical field of cable-stayed bridge construction. Comprising the following steps that S1, a storage platform is erected; s2, a hoisting mechanism is erected; s3, mounting a bracket; s4, assembling a first section of steel beam; s5, lapping a first section of steel beam; s6, bridge deck slabs are erected; s7, a next steel beam section is erected, specifically, the spliced steel beam section in the storage platform is lifted to the top face of the bracket through a lifting station and erected through a suspended splicing crane, and meanwhile corresponding stay cables are hung and tensioned on the steel beam section; s8, the construction steps S6-S7 are repeated, and the bridge deck slab and the steel beam sections are erected through the tower crane and the lifting station; the storage platform is composed of a rod piece storage area, a steel frame splicing area and a vehicle passing area. The problems that when an existing steel-alkali superposed beam cable-stayed bridge is constructed through a single crane and an integrated suspension splicing device, the construction efficiency is low, the construction precision is low, and the construction procedure is complex are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of cable-stayed bridge construction, and in particular relates to a method for constructing bridge deck steel beam segments of a double-tower double-cable-plane steel-concrete composite beam cable-stayed bridge. Background Art

[0002] A cable-stayed bridge is a type of bridge that uses cables to pull the main beam directly onto the bridge tower. It is a structural system that is composed of a compression-bearing bridge tower, a tension-bearing cable, and a bending-bearing beam. Due to the horizontal force of the cables, the beam of a cable-stayed bridge is subjected to large compressive stress. The design often uses a steel-composite beam to give full play to the tensile properties of the steel structure and the compressive properties of the concrete. Steel-composite composite beam cable-stayed bridges are currently developing rapidly at home and abroad.

[0003] The steel beam sections of the steel-alkali composite cable-stayed bridge are hoisted and assembled by a bridge crane installed on the installed steel beam sections. When hoisting and constructing precast concrete panels, the conventional practice is to transport the bridge panels to the site by a flatbed truck and install them on the ground by a crane or by a gantry crane on the bridge deck. If the bridge crosses a river or a canyon, the use of a crane for installation will not be possible and is not universally applicable.

[0004] Moreover, the installation of the cable-stayed bridge and the assembly of the steel beam are carried out alternately, and the bridge has many components, which are easily affected by the environment during installation. When assembling the composite beam segments on site, the assembly process is greatly affected by factors such as temperature, cable-stayed bridges, and bridge deformation. In addition, the installation accuracy is high, the construction process is complicated, and the construction difficulty is relatively high. Therefore, when a single crane and an integrated suspension assembly device are used for construction, the construction efficiency is low, the construction accuracy is low, and the construction is complicated. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a method for constructing bridge deck steel beam segments of a double-tower and double-cable-plane steel-concrete composite beam cable-stayed bridge, which solves the problems of low construction efficiency, low construction accuracy and complex construction procedures when the existing steel-alkali composite beam cable-stayed bridge is constructed using a single crane and an integrated suspension assembly device.

[0006] The purpose of the present invention can be achieved by the following technical solution: A method for constructing a steel beam segment of a double-tower double-cable-plane steel-concrete composite beam cable-stayed bridge, comprising the following steps:

[0007] S1: Set up a storage platform. Set up a steel beam segment storage platform on the side of the 2# side pier under the pedestal of the 1# main tower, and set up a trestle on the side of the storage platform close to the 2# side pier. The storage platform is used to splice each section of the steel beam segment;

[0008] S2: Set up the hoisting mechanism, construct the lower beams of the main tower and side piers and install the embedded parts. When the concrete strength of the lower beams reaches the preset requirements, set up the heavy tower crane and two auxiliary tower cranes at the top of the main tower and side piers;

[0009] S3: Bracket installation: Use a tower crane to hoist the bracket steel components to the embedded parts and complete the installation;

[0010] S4: Assembling the first section of steel beams. The heavy tower crane hoists the steel beam rods to the top surface of the bracket and assembles the first section of steel beams. Then the auxiliary tower crane hoists the lifting station components and completes the installation.

[0011] S5: Overlap the first section of steel beam and anchor the assembled first section of steel beam on the lower crossbeam using a heavy tower crane;

[0012] S6: Bridge deck erection: laying the sliding track on the upper chord of the first steel beam, installing the suspension crane on the sliding track, and laying the bridge deck on the top surface of the lower chord;

[0013] S7: erection of the next steel beam segment, lifting the spliced ​​steel beam segment in the storage platform to the top surface of the bracket through the lifting station and erecting it through the suspension crane, and at the same time hanging and tensioning the corresponding inclined cables on the steel beam segment;

[0014] S8: Repeat construction steps S6-S7, and use the tower crane and lifting station to erect the bridge deck and steel beam segments;

[0015] The storage platform consists of a rod storage area, a steel frame assembly area and a vehicle passage area.

[0016] As a preferred technical solution of the present invention, a storage platform is built on the bottom pedestal of the side pier, and the trestle connects the storage platforms of the main tower and the side pier. A gantry crane is provided on the side of the two storage platforms close to the trestle, and the steel beam components are transported from the storage platform under the main tower to the storage platform where the side pier is located through the gantry crane and the trestle.

[0017] As a preferred technical solution of the present invention, in step S3, the first section of the steel beam is assembled in the steel frame assembly area while the bracket is hoisting.

[0018] As a preferred technical solution of the present invention, in step S4, a wind cable is provided when the steel beam is hoisted by a heavy tower crane.

[0019] As a preferred technical solution of the present invention, a slide rail is provided on the top surface of the suspension crane, a rail flat car is provided on the slide rail, and the rail flat car is used to lift the assembled beam section into the working range of the suspension crane.

[0020] As a preferred technical solution of the present invention, the cantilever crane is a double-track detachable crane, which includes two hanging beam trolleys, a transverse track, a machine arm and a telescopic arm. The two hanging beam trolleys are slidably connected to the telescopic end of the telescopic arm, the telescopic arm is slidably arranged at the front end of the machine arm, and the machine arm is slidably arranged on the top surface of the sliding track.

[0021] As a preferred technical solution of the present invention, in step S7, when the suspension crane hoists the steel beam, the center and axis of the steel beam are located at the center of the support and the designed axis by adjusting the vertical and horizontal positions of the machine arm, telescopic arm and two beam trolleys.

[0022] As a preferred technical solution of the present invention, in step S7, the first tensioning of the cable-stayed cables is performed after the steel beams are erected, and the second tensioning of the cable-stayed cables is performed after the bridge deck is installed.

[0023] The beneficial effects of the present invention are as follows: the steel beams are assembled by means of a storage platform, and the bridge deck is hoisted and constructed by means of two auxiliary tower cranes, and the steel beams are constructed by transporting the rods to the side piers through the trestle, so that the main tower and the side piers can be constructed toward the middle at the same time, thereby completing the joint more quickly, thereby improving the construction efficiency, and avoiding the situation in which the installation of the inclined cable and the assembly of the steel beams are carried out alternately and the construction efficiency is low due to the complicated construction process caused by the large number of components, and the bridge deck and steel beams are hoisted and constructed by means of the setting of three tower cranes and a lifting station, and the three tower cranes can construct the steel beams and the bridge deck more easily, thereby reducing the construction difficulty, and solving the problems of low construction efficiency, low construction precision and complicated construction process of the existing steel-alkali composite beam cable-stayed bridge when a single crane and an integrated suspension assembly device are used for construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0025] Figure 1 It is a flow chart of the construction method of the present invention;

[0026] Figure 2 This is a schematic diagram of the construction of steps S1-S2 of the present invention;

[0027] Figure 3 This is a construction diagram of step 3 of the present invention;

[0028] Figure 4 This is a construction diagram of step 4 of the present invention;

[0029] Figure 5 This is a schematic diagram of the construction of steps 5-6 of the present invention;

[0030] Figure 6This is a partial schematic diagram of the construction of step 6 of the present invention;

[0031] Figure 7 This is a schematic diagram of the storage platform structure of the present invention;

[0032] Figure 8 It is a side view of the cantilever crane of the present invention;

[0033] Fig. 9 It is a schematic diagram of the construction process of the suspended crane frame beam of the present invention;

[0034] Main component symbols

[0035] In the figure: 1. Main tower; 2. Storage platform; 21. Rod storage area; 22. Steel frame assembly area; 23. Vehicle traffic area; 3. Side pier; 4. Trestle; 5. Heavy tower crane; 6. Auxiliary tower crane; 7. Bracket; 8. Lifting station; 9. Suspended crane; 91. Beam trolley; 92. Transverse track; 93. Machine arm; 94. Telescopic arm; 10. Gantry crane; 11. Steel beam; 12. Track flat car; 13. Slide rail. DETAILED DESCRIPTION

[0036] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0037] See also Figure 1-Figure 9 This embodiment provides a method for constructing a bridge deck steel beam segment of a double-tower double-cable-plane steel-concrete composite beam cable-stayed bridge, comprising the following steps:

[0038] S1: Set up a storage platform 2. Set up a storage platform 2 for steel beam 11 segments on the side of the 2# side pier 3 under the pedestal of the 1# main tower 1. The storage platform 2 needs to meet the acceptance of 8 segments before hoisting. The 2# side pier 3 is located on the water surface and cannot directly transport the steel beam 11 segments. Therefore, a trestle 4 is set up on the side of the storage platform 2 close to the 2# side pier 3. At the same time, a storage platform 2 is also set up on the side of the 2# side pier 3. The steel beam 11 segments are transported to the storage platform 2 on the side of the 2# side pier 3 through the trestle 4. The storage platform 2 is used to splice the steel beam 11 segments;

[0039] S2: erecting the hoisting mechanism, constructing the lower cross beams of the main tower 1 and the side pier 3 and installing the embedded parts. When the concrete strength of the lower cross beams reaches the preset requirements, erecting the heavy tower crane 5 and two auxiliary tower cranes 6 at the top of the main tower 1 and the side pier 3;

[0040] S3: bracket 7 installation, the bracket 7 steel component is hoisted to the embedded part by a tower crane and the installation is completed, and at the same time, a pre-compression test is performed on the completed bracket 7 to eliminate non-elastic deformation;

[0041] S4: Assemble the first section of the steel beam 11. Use the heavy tower crane 5 between the two bridges to hoist the steel beam 11 to the top surface of the bracket 7 and assemble the first section of the steel beam 11. Then, use the auxiliary tower crane 6 to hoist the lifting station 8 components and complete the installation. Perform a hoisting test to ensure that the hoisting load of the tower crane meets the requirements.

[0042] S5: Overlap the first steel beam 11, and anchor the assembled first steel beam 11 on the lower crossbeam by using the heavy tower crane 5;

[0043] S6: bridge deck erection, laying a sliding track on the upper chord of the first steel beam 11, installing a suspension crane 9 on the sliding track, and laying a bridge deck on the top surface of the lower chord;

[0044] S7: erecting the next steel beam 11 section, lifting the steel beam 11 section spliced ​​in the storage platform 2 to the top surface of the bracket 7 through the lifting station 8 and erecting it through the suspension crane 9, and at the same time hanging and tensioning the corresponding inclined cable on the steel beam 11 section;

[0045] S8: Repeat construction steps S6-S7, and use the tower crane and lifting station 8 to erect the bridge deck and steel beam 11 segments;

[0046] The storage platform 2 is composed of a rod storage area 21 , a steel frame assembly area 22 and a vehicle passage area 23 .

[0047] During the construction of the cable-stayed bridge, the rod components of the steel beam 11 are stored in the rod storage area 21 in the storage platform 2, and then each section of the steel beam 11 is assembled in the steel frame assembly area 22. At the same time, the rods are transported to the 2# side pier 3 through the trestle 4 through the vehicle traffic area, so that the main tower 1 and the side pier 3 can be constructed at the same time. In addition, during the construction process, the heavy tower crane 5 and the two auxiliary tower cranes 6 can be constructed at the same time to synchronously hoist the materials and the assembled steel beam 11, thereby improving the construction efficiency. In addition, the steel beam 11 is assembled through the storage platform 2, and then the bridge deck is assembled through the two auxiliary tower cranes 6. The bridge deck is hoisted for construction, and the rods are transported to the side pier 3 through the trestle 4 to carry out the construction of the steel beam 11, so that the main tower 1 and the side pier 3 can be constructed towards the middle at the same time, so that the joint can be completed more quickly, thereby improving the construction efficiency and avoiding the situation in which the installation of the inclined cable and the assembly of the steel beam 11 are carried out alternately, resulting in low construction efficiency due to complicated construction procedures due to the large number of components. In addition, the bridge deck and the steel beam 11 are hoisted for construction by the setting of three tower cranes and the lifting station 8. Moreover, the three tower cranes can carry out the construction of the steel beam 11 and the bridge deck more easily, reducing the difficulty of construction.

[0048] In order to better improve the construction efficiency, in this embodiment, a storage platform 2 is set up on the bottom foundation of the side pier 3, and a trestle 4 connects the storage platforms 2 of the main tower 1 and the side pier 3. A gantry crane 10 is provided on the side of the two storage platforms 2 close to the trestle 4. The steel beam 11 components are transported from the storage platform 2 under the main tower 1 to the storage platform 2 where the side pier 3 is located through the gantry crane 10 and the trestle 4. By also setting up a storage platform 2 on one side of the side pier 3, the side pier 3 can be aligned with the main tower 1 during construction, thereby improving the construction progress. In addition, during construction, the gantry crane 10 set on the storage platform 2 can be used to quickly transport materials to the side pier 3 through the trestle 4, so that the rods can be quickly assembled into steel beams 11 to complete the construction.

[0049] In order to shorten the construction time, in one embodiment, in step S3, the first section of steel beam 11 is assembled in the steel frame assembly area 22 while the bracket 7 is being hoisted. When the bracket 7 is being hoisted, the first section of steel beam 11 is being assembled synchronously. In this way, after the construction of the bracket 7 is completed, the steel beam 11 can be synchronously hoisted on the bracket 7 to carry out the construction of the first section of steel beam 11, thereby shortening the time spent on collecting the steel beams 11 on the bracket 7 for assembly, thereby improving construction efficiency.

[0050] In order to ensure safety during the construction process, in one embodiment, in step S4, the steel beam 11 is provided with a wind catch when it is hoisted by the heavy tower crane 5. When the steel beam 11 is hoisted, the wind catch is provided to prevent the steel beam 11 from swinging and colliding with the crane and the installed beam section during the hoisting process, and the lifting slings are checked regularly to ensure hoisting safety.

[0051] In order to improve the speed of moving the steel beam 11 to the splicing area during the construction process, so as to complete the splicing construction of the steel beam 11 section by section, in one embodiment, a slide rail 13 is provided on the top surface of the suspension crane 9, and a rail flat car 12 is provided on the slide rail 13. The rail flat car 12 is used to lift the assembled beam section into the working range of the suspension crane 9, and use the tower crane to put the assembled beam section in place on the bridge deck as a temporary frame for assembling the segmental beam, and assemble the steel beam 11, longitudinal beam, cross beam and small longitudinal beam into the segmental beam in the longitudinal direction of the bridge, and then use two rail flat cars 12 to transport the segmental beam to the working range of the suspension crane 9 to complete the beam feeding. The suspension crane 9 lifts the segmental beam and moves it longitudinally to the rotation station to complete the rotation of the segmental beam, and then the beam section is constructed and installed, so that the splicing construction of the steel beam 11 can be carried out faster.

[0052] During the construction process, it is also necessary to ensure the splicing accuracy of the steel beam 11, so as to improve the construction quality and avoid the situation where the construction accuracy is affected by the cumulative error generated during the splicing process. In one embodiment, the suspension crane 9 is a double-track detachable crane, and the suspension crane 9 includes two beam trolleys 91, a transverse track 92, a machine arm 93 and a telescopic arm 94. The two beam trolleys 91 are both slidably connected to the telescopic end of the telescopic arm 94, and the telescopic arm 94 is slidably arranged at the front end of the machine arm 93, and the machine arm 93 is slidably arranged on the top surface of the sliding track. When the steel beam 11 is fed by the track flat car 12, during the construction of the suspension crane 9, the steel beam 11 is placed on the beam transport vehicle, and the front end of the beam trolley 91 lowers the hanger and places the beam hoisting rope. After the beam hoisting rope is installed in place, the beam body is lifted 710cm away from the beam transport bracket. Then the beam hoisting trolley 91 moves forward synchronously with the main beam transport vehicle, and when the rear end of the beam body is sent to the bottom of the rear beam hoisting trolley 91, the beam is tied and hoisted. The rear beam hoisting trolley 91 lifts the beam and keeps the beam horizontal, so that the beam body is in a fully suspended state, and then the two beam hoisting trolleys 91 are started at the same time to make the beam move longitudinally smoothly. After the beam moves longitudinally into place and the beam body is stable, the two beam hoisting trolleys 91 drop the beam at the same time.

[0053] In order to further improve the accuracy of the steel beam 11 during the process of hoisting and splicing, in step S7, when the suspension crane 9 hoists the steel beam 11, the machine arm 93, the telescopic arm 94 and the two beam trolleys 91 are adjusted in the vertical and horizontal positions so that the center and axis of the steel beam 11 are located at the center of the support and the position of the designed axis. When the beam body is about 30 mm away from the top surface of the support cushion stone, the beam is stopped, and then the elevation of the transverse track 92 is adjusted, and the bridge erection machine is moved horizontally to the waiting position. The machine arm 93 and the telescopic arm 94 are adjusted to align with the center position of the support and the designed axis. The elevation is adjusted and the support anchor mortar is poured. After the strength of the anchor mortar reaches 20Mp, the hoist rope can be removed, thereby ensuring that a high-precision construction process can be guaranteed during the construction and splicing of the steel beam 11, and reducing the occurrence of poor construction quality due to accumulated errors in the splicing construction of each steel beam 11.

[0054] In order to ensure that the cables of the cable-stayed bridge can reach the preset standards during the construction process, thereby ensuring the construction quality of the cables, in one embodiment, in step S7, the cables are tensioned for the first time after the steel beam 11 is erected, and the cables are tensioned for the second time after the bridge deck is installed. By tensioning the cables twice, the stability of the steel beam 11 can be ensured during the construction of the steel beam 11. At the same time, when the bridge deck is installed, the cables are tensioned again to ensure that the bridge deck can remain on the preset bridge linearity after the construction is completed, thereby ensuring the quality of the construction.

[0055] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for constructing a steel beam segment of a double-tower double-cable-plane steel-concrete composite cable-stayed bridge, characterized in that: The following steps are involved: S1: Set up a storage platform. Set up a steel beam segment storage platform on the side of the 2# side pier under the pedestal of the 1# main tower, and set up a trestle on the side of the storage platform close to the 2# side pier. The storage platform is used to splice each section of the steel beam segment; S2: Set up the hoisting mechanism, construct the lower beams of the main tower and side piers and install the embedded parts. When the concrete strength of the lower beams reaches the preset requirements, set up the heavy tower crane and two auxiliary tower cranes at the top of the main tower and side piers; S3: Bracket installation: Use a tower crane to hoist the bracket steel components to the embedded parts and complete the installation; S4: Assembling the first section of steel beams. The heavy tower crane hoists the steel beam rods to the top surface of the bracket and assembles the first section of steel beams. Then the auxiliary tower crane hoists the lifting station components and completes the installation. S5: Overlap the first section of steel beam and anchor the assembled first section of steel beam on the lower crossbeam using a heavy tower crane; S6: Bridge deck erection: laying the sliding track on the upper chord of the first steel beam, installing the suspension crane on the sliding track, and laying the bridge deck on the top surface of the lower chord; S7: erection of the next steel beam segment, lifting the spliced ​​steel beam segment in the storage platform to the top surface of the bracket through the lifting station and erecting it through the suspension crane, and at the same time hanging and tensioning the corresponding inclined cables on the steel beam segment; S8: Repeat construction steps S6-S7, and use the tower crane and lifting station to erect the bridge deck and steel beam segments; The storage platform consists of a rod storage area, a steel frame assembly area and a vehicle passage area.

2. The method for constructing bridge deck steel beam segments of a double-tower double-cable-plane steel-concrete composite beam cable-stayed bridge according to claim 1, characterized in that: A storage platform is built on the bottom supporting platform of the side pier, and the trestle connects the storage platforms of the main tower and the side pier. A gantry crane is provided on the side of the two storage platforms close to the trestle. The steel beam components are transported from the storage platform under the main tower to the storage platform where the side pier is located through the gantry crane and the trestle.

3. The method for constructing bridge deck steel beam segments of a double-tower double-cable-plane steel-concrete composite cable-stayed bridge according to claim 1, characterized in that: In step S3, the first section of the steel beam is assembled in the steel frame assembly area while the bracket is being hoisted.

4. The method for constructing bridge deck steel beam segments of a double-tower double-cable-plane steel-concrete composite beam cable-stayed bridge according to claim 1, characterized in that: In step S4, the steel beam is installed by a heavy tower crane with a wind cable.

5. The method for constructing bridge deck steel beam segments of a double-tower double-cable-plane steel-concrete composite beam cable-stayed bridge according to claim 1, characterized in that: A slide rail is provided on the top surface of the suspension crane, and a rail flat car is provided on the slide rail. The rail flat car is used to lift the assembled beam section into the working range of the suspension crane.

6. The method for constructing bridge deck steel beam segments of a double-tower double-cable-plane steel-concrete composite beam cable-stayed bridge according to claim 5, characterized in that: The cantilever crane is a double-track detachable crane, which includes two hanging beam trolleys, a transverse track, a machine arm and a telescopic arm. The two hanging beam trolleys are slidably connected to the telescopic end of the telescopic arm, the telescopic arm is slidably arranged at the front end of the machine arm, and the machine arm is slidably arranged on the top surface of the sliding track.

7. The method for constructing bridge deck steel beam segments of a double-tower double-cable-plane steel-concrete composite beam cable-stayed bridge according to claim 6, characterized in that: In step S7, when the suspension crane is hoisting the steel beam, the machine arm, telescopic arm and two beam hoisting trolleys are adjusted in the vertical and horizontal directions so that the center and axis of the steel beam are located at the center of the support and the position of the designed axis.

8. The method for constructing bridge deck steel beam segments of a double-tower double-cable-plane steel-concrete composite beam cable-stayed bridge according to claim 1, characterized in that: In step S7, after the steel beam is erected, the first stay cable is tensioned, and after the bridge deck is installed, the second stay cable is tensioned.

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