Construction method of high-altitude suspension cable bridge

Abstract

The application discloses a construction method based on a high-altitude suspension cable bridge, and relates to the technical field of building, and comprises the following steps: S10, temporarily reinforcing a stress layer structure of a position where a connecting bridge is installed, so as to ensure the structural strength and stability of the position where the connecting bridge is installed; S20, installing embedded components and a sliding track and temporarily positioning and supporting a bottom of a spliced section; S30, sliding and installing and positioning components of connecting bridge sections at two ends of the connecting bridge by lifting equipment; S40, ground welding, polishing and painting of the components of the connecting bridge middle section are simultaneously performed on the middle double-machine lifting and hoisting part, and temporary fixing lugs are welded; S50, integral lifting work of the connecting bridge middle section is performed by two tower cranes; S60, the connecting bridge middle section is welded with the connecting bridge sections at the two ends of the connecting bridge, so that main body construction is completed; and S70, bridge accessory component installation, specifically comprising: main cable installation and pull rod installation. The application has the beneficial effects of saving construction cost and construction cost.

Description

Technical Field

[0001] This invention relates to the field of building technology, and more specifically, to a construction method for a high-altitude suspension cable bridge. Background Technology

[0002] To improve connectivity and efficiency between buildings, sky bridges are increasingly being incorporated into modern architecture. This not only expands the transition between floors in high-rise buildings but also enhances their aesthetics. While sky bridges are not a new challenge for the construction industry, their designs vary greatly to reflect individuality. Furthermore, there is no universally applicable construction method for high-altitude sky bridges, making their construction one of the techniques that best showcases the professionalism of a construction team.

[0003] Traditional methods for constructing aerial bridges mainly include overall lifting and the erection of temporary supports. Overall lifting is primarily used for short-span, lightweight bridges, but this method requires sophisticated hoisting equipment, presents challenges in positioning, and demands that the ground assembly area be precisely located below the installation position, placing stringent requirements on the site. However, this method is fast and inexpensive. Erecting temporary supports is more common in large or irregularly shaped bridges, effectively ensuring construction safety and precise bridge installation positioning. However, the erection process is time-consuming and labor-intensive, with high requirements for cost and schedule, and requires prolonged occupation of the construction site. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, the present invention provides a construction method based on high-altitude suspension cable bridge, which solves the problems of high cost and construction period requirements of the current construction method, and saves construction time and construction costs.

[0005] The technical solution adopted by this invention to solve its technical problem is: a construction method based on a high-altitude suspension cable bridge, the improvement of which is that the construction method includes the following steps:

[0006] S10, temporarily reinforce the load-bearing structure at the location of the bridge installation to ensure the structural strength and stability of the location of the bridge installation;

[0007] S20, Install embedded components and sliding rails, and temporarily position and support the bottom of the splicing section;

[0008] S30 uses lifting equipment to slide and install the components of the connecting bridge sections at both ends of the connecting bridge;

[0009] S40, in the middle double-machine lifting section, the components of the middle section of the connecting bridge are ground welded, ground polished and painted, and temporary fixing ear plates are welded at the same time;

[0010] S50 uses two tower cranes to lift the middle section of the connecting bridge as a whole.

[0011] S60 involves welding the middle section of the connecting bridge to the connecting bridge sections at both ends to complete the main construction.

[0012] S70, Installation of bridge ancillary components, specifically including: main cable installation and tie rod installation.

[0013] Furthermore, in step S20, the specific construction sequence is as follows:

[0014] S201, install partial sliding rails, cantilever support platforms and sliding platforms to form a temporary transport route for the outer frame cantilever wing;

[0015] S202, Install and weld the corresponding support base on the original structural steel beam. After the support base is installed, install the corresponding support. The support is located at the end of the connecting bridge segment.

[0016] S203, Lay the remaining floor deck, tie the reinforcing bars, embed the sliding track pre-embedded parts and pour concrete;

[0017] S204, after the concrete reaches a certain strength, complete the laying of the remaining sliding track.

[0018] Furthermore, in step S202, before the support is installed and positioned, it is necessary to remeasure and lay out the positioning. The coordinates of the support installation are finely adjusted according to the actual measurement data to eliminate the error caused by the deformation of the main tower and ensure that the installed support is located on the same horizontal straight line. Before welding, temporary welding of steel plates is used to fix the support to prevent welding deformation and deviation. Then, the support is fixed by skip welding of fillet welds to ensure that the support is in a locked state.

[0019] Furthermore, in step S30, the specific construction steps include:

[0020] S301, Cantilever Area Lifting: Before lifting, several lifting lugs are installed on the connecting bridge section. An adjustable chain hoist is installed at the lifting point of the connecting bridge section on the side of the tower crane hook closest to the core tube, while the other lifting point uses a wire rope directly. During lifting, after the connecting bridge section is lifted to near the outer edge beam, the direction of movement is controlled by the traction rope, and the distance of movement is controlled by adjusting the tower crane. Once the connecting bridge section reaches the designated position, it is slowly transferred to the sliding platform. After lifting, the connecting bridge section is first pulled up by adjusting the chain hoist, then temporary support trestles are installed, and finally the connecting bridge section is placed on the support trestles.

[0021] S302, Installation, assembly, welding and correction: Due to insufficient operating space at the end of the connecting bridge segment, it is necessary to first set up support trestles and then set up lifting devices on the support trestles to raise the entire connecting bridge. The method of setting up the support trestles is the same as in step S301. When the entire connecting bridge segment is raised to meet the operating space at the end of the connecting bridge, the bridge segment is temporarily fixed with a plate and then welded.

[0022] Furthermore, in step S302, the connecting bridge segment is divided into two parts. The specific welding steps for the connecting bridge segment are as follows: first, the connecting bridge segment is lifted as a whole by adjusting the chain hoist, then the bottom support trestles are quickly removed, and finally the first part of the connecting bridge segment is placed in the design required position, and the welding of the first part of the connecting bridge segment and the support is completed; after the welding of the first part of the connecting bridge segment is completed, temporary support columns are installed first, and then bridge columns are installed; the second part of the connecting bridge segment is fixed by the mounting plate during installation. After installation, the overall linearity of the bridge deck is adjusted by the lifting device in conjunction with the support trestles. After the linearity adjustment is completed, the whole structure is welded.

[0023] Furthermore, in step S40, the specific construction method for ground welding of the middle section of the connecting bridge is as follows: first, steel connecting bridge assembly measures are set up on the ground. After the assembly measures are set up, the connecting bridge sections are placed on the ground assembly measures and temporarily connected and fixed using mounting plates. After the middle section of the connecting bridge is assembled as a whole, the connecting bridge sections are welded to form a whole.

[0024] Furthermore, in step S50, before installing the middle section of the connecting bridge, the connecting bridge welding operation platform needs to be inserted into the track channel steel of the connecting bridge, and the connecting bridge welding operation platform is moved to the inside by the directional pulleys set at the bottom of the operation platform. Then, the entire middle section of the connecting bridge is lifted to the designated position by a tower crane using two machines. Finally, the weld joint at the top of the bridge body is completed and the connecting bridge welding operation platform is moved to the interface position to complete the overhead welding of the bottom of the connecting bridge.

[0025] Furthermore, in step S70, the specific method of installing the main cable is as follows: one end of the main cable is lifted directly by a tower crane, the other end of the main cable is placed on the bridge deck and pulled by a winch, a traction trolley is placed under the bottom of the main cable, and the height of the tower crane is slowly lowered at the same time until the end of the main cable is moved to the inside of the core tube, until the other side of the main cable is slowly placed on the bridge deck.

[0026] Furthermore, in step S70, the specific method of installing the tie rod is as follows: the main cable is raised to a certain height, and then the tie rod is installed according to the positioning point of the cable clamp on the main cable, and the cable head at the upper end of the suspender is installed so that the suspender is tilted and suspended on the main cable; after the main cable is pulled into place, the fork cable head at the lower end of the suspender is installed, and tensioned symmetrically from both sides to the middle one by one.

[0027] Furthermore, after the tie rods are installed, the vertical acceleration of the bridge deck under environmental and pedestrian excitations needs to be tested, and a TMD (Transmission Modulator) needs to be fabricated based on the test results. After fabrication, the TMD is installed into the box girder, and the natural frequency and vertical acceleration of the connecting bridge are retested. The test data are then compiled and compared with the test data without the TMD, and a test report is finally provided.

[0028] The beneficial effects of this invention are: the connecting bridge is installed in two ways, wherein the core tube and the inner sections of the cantilever are spliced ​​by track sliding, and the middle section is constructed by overall hoisting, without the need for temporary supports, thus saving construction costs and time. Attached Figure Description

[0029] Figure 1 This is a flowchart illustrating a construction method for a high-altitude suspension cable-stayed bridge according to the present invention.

[0030] Figure 2 This is a construction illustration of a construction method for a high-altitude suspension cable-stayed bridge according to the present invention. Figure 1 ;

[0031] Figure 3 This is a construction illustration of a construction method for a high-altitude suspension cable-stayed bridge according to the present invention. Figure 2 ;

[0032] Figure 4 This is a construction illustration of a construction method for a high-altitude suspension cable-stayed bridge according to the present invention. Figure 3 ; Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] The following will clearly and completely describe the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this invention can be combined interactively without contradicting each other.

[0035] Reference Figure 1-4 As shown, this invention discloses a construction method for a high-altitude suspension cable-stayed bridge, the construction method comprising the following steps:

[0036] S10, temporarily reinforce the load-bearing structure at the location of the bridge installation to ensure the structural strength and stability of the location of the bridge installation;

[0037] S20, Install the embedded components and sliding rail 3, and temporarily position and support the bottom of the splicing section; the specific construction sequence is as follows:

[0038] S201, install part of the sliding track 3, cantilever support platform 7 and sliding platform to form a temporary transport route for the outer frame cantilever 6;

[0039] S202, before the support is installed, the corresponding support base is welded on the original structural steel beam. After the support base is installed, the corresponding support is installed. The support is set at the end of the connecting bridge segment 4. In addition, before the support is installed and positioned, the positioning must be re-measured and laid out. The support installation coordinates are finely adjusted according to the actual measurement data to eliminate the error caused by the deformation of the main tower and ensure that the installed support is on the same horizontal straight line. Before welding, temporary welding of steel plates is used to fix the support to prevent welding deformation and deviation. Then, the support is fixed by skip welding of fillet welds to ensure that the support is in a locked state. In this embodiment, a total of 8 supports are set between the connecting bridge and the tower structure, including 4 compression supports and 4 tension supports, which are set at the end of the connecting bridge.

[0040] S203, Lay the remaining floor deck, tie the reinforcing bars, pre-embed the sliding track 3 pre-embedded parts and pour concrete;

[0041] S204. After the concrete reaches a certain strength, the remaining sliding track 3 will be laid.

[0042] S30, using lifting equipment to slide and position the components of segment 4 of the connecting bridge at both ends; specific construction steps include:

[0043] S301, Cantilever 6 Area Lifting: Before lifting, 6 lifting lugs are installed on the connecting bridge section 4. Among them, 2 adjusting chain hoists 2 are installed on the lifting point of the connecting bridge section 4 near the core tube 5 on the tower crane hook, and the other 2 lifting points are directly connected by steel wire rope 1. During lifting, after the connecting bridge section 4 is lifted to the vicinity of the outer side beam, the movement direction is controlled by the traction rope and the movement distance of the connecting bridge section 4 is controlled by adjusting the tower crane. After the connecting bridge section 4 is moved to the designated position, it is slowly transferred to the sliding platform. After the lifting is completed, the connecting bridge section 4 is first pulled up by adjusting the chain hoists 2, then the support trestles are temporarily installed, and finally the connecting bridge section 4 is placed on the support trestles.

[0044] S302, Installation, Welding, and Alignment: Because the minimum distance between the butt joint surface of the connecting bridge section and the floor slab is only 380mm, the operating space at the end of connecting bridge section 4 is insufficient, preventing workers from performing on-site welding. Therefore, support supports must be installed first, and a lifting device must be installed on the support supports to raise the entire connecting bridge, ensuring that the minimum distance from the end to the ground is 900mm. The method of setting up the support supports is the same as in step S301. Once connecting bridge section 4 is raised to meet the required operating space at the end of the connecting bridge, temporary fixing plates are used, and welding of connecting bridge section 4 is then performed. The connecting bridge segment 4 is divided into two parts. The specific welding steps for connecting bridge segment 4 are as follows: First, the entire connecting bridge segment is lifted by adjusting the chain hoist 2. Then, the bottom support trestles are quickly removed. Finally, the first part of the connecting bridge segment is placed in the design-required position, and the welding of the first part of the connecting bridge segment and the support is completed. After the welding of the first part of the connecting bridge segment is completed, temporary support columns are installed at 1 / 4 of the bridge column position, and then the bridge column is installed. The second part of the connecting bridge segment is fixed by a clamp plate during installation. After installation, the overall linearity of the bridge deck is adjusted by a lifting device in conjunction with the support trestles. After the linearity adjustment is completed, the entire structure is welded. In this embodiment, the lifting device is a jack.

[0045] S40, in the middle double-machine lifting section, the components of the middle section of the connecting bridge are ground welded, ground polished and painted, and temporary fixing ear plates are welded at the same time; the specific construction method of ground welding of the middle section of the connecting bridge is as follows: first, steel connecting bridge assembly measures are set up on the ground. After the assembly measures are set up, connecting bridge segment 4 is placed on the ground assembly measures and temporarily connected and fixed with clamps. After the middle section of the connecting bridge is fully assembled, connecting bridge segment 4 is welded to form a whole.

[0046] S50 involves using two tower cranes to lift the middle section of the connecting bridge as a whole. Before installing the middle section, the welding operation platform of the connecting bridge needs to be inserted into the track channel steel of the connecting bridge. The platform is then moved to the inside using directional pulleys at the bottom. The tower cranes then lift the entire middle section of the connecting bridge to the designated position using two cranes. Finally, the weld joint at the top of the bridge is completed, and the welding operation platform is moved to the joint position to complete the overhead welding of the bottom of the connecting bridge.

[0047] S60, the middle section of the connecting bridge is welded to the connecting bridge segments 4 at both ends of the connecting bridge to complete the main construction;

[0048] S70, Bridge auxiliary component installation, specifically including: main cable 9 installation and tie rod installation; wherein, the main cable 9 is installed as follows: the main cable 9 is 90m long and weighs 6t. One end of the main cable 9 is lifted directly using a tower crane, and the other end of the main cable 9 is placed on the bridge deck and pulled by a winch. A traction trolley 8 is placed under the bottom of the main cable 9, and the tower crane is slowly lowered at the same time until the end of the main cable 9 is moved to the inside of the core tube 5, until the other side of the main cable 9 is slowly placed on the bridge deck; the tie rod is installed as follows: the main cable 9 is raised to a certain height, and then the tie rod is installed according to the positioning points of the cable clamps on the main cable 9, and the cable head at the upper end of the suspender is installed, so that the suspender is tilted and suspended on the main cable 9; after the main cable 9 is pulled into place... Install the lower end of the tie rod and tension the cables one by one symmetrically from both sides towards the middle. In this embodiment, the tensioning construction mainly involves tensioning the back cables, divided into four levels: level one tensioning to 25% of the design preload, level two tensioning to 50% of the design preload, level three tensioning to 75% of the design preload, and level four tensioning to 100% of the design preload, with four back cables tensioned simultaneously at each level. In addition, after the tie rod is installed, the vertical acceleration of the bridge deck under environmental and pedestrian excitation needs to be tested, and a TMD (Transient Dynamic Modulation) needs to be fabricated based on the test results. After fabrication, the TMD is installed into the box girder, and the natural frequency and vertical acceleration of the connecting bridge are retested. The test data are then compiled and compared with the test data without TMD, and a test report is finally provided.

[0049] In this embodiment, the entire bridge construction method is segmented splicing. The bridge segments within the floor slab projection are slid and assembled in sections. First, the segmental components are placed onto the supports using a chain hoist and tower crane, then slid to the designated position. A pre-installed lifting system is then used to lift the components onto temporary supports and position them, followed by welding. The middle section is constructed using a dual-crane hoisting system for overall lifting and assembly. All splicing and painting of the middle section are completed on the ground. After completion, the bridge segment is temporarily stabilized by the dual-crane hoisting system on the end plates before proceeding to the next welding step, continuing until the weld is secure to complete the overall welding of the bridge. This process eliminates the need for temporary supports to support construction workers throughout the construction process, thus saving construction time and costs.

[0050] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A construction method of a high air suspension cable bridge, characterized by, The construction method comprises the following steps: S10, temporarily reinforcing the stress layer structure at the installation position of the connecting bridge to ensure the structural strength and stability of the installation position of the connecting bridge; S20, installing the pre-buried component and the sliding track and temporarily positioning and supporting the bottom of the spliced segment; the specific construction sequence is as follows: S201, installing part of the sliding track, the cantilever support platform and the sliding platform to form the temporary measure transportation route of the outer frame cantilever wing; S202, installing the corresponding support base on the original structure steel beam by welding, and then installing the corresponding support after the support base is installed, wherein the support is arranged at the end position of the connecting bridge segment; S203, laying the remaining floor slab, binding the steel bars, pre-burying the sliding track pre-buried part and pouring the concrete; S204, completing the laying of the remaining sliding track after the concrete reaches a certain strength; S30, sliding and installing and positioning the components of the connecting bridge segments at both ends of the connecting bridge by the lifting equipment; S40, ground welding, polishing and painting the components of the connecting bridge middle segment by using the double-machine lifting part, and welding the temporary fixing lug plate; S50, integrally lifting the connecting bridge middle segment by using two tower cranes; S60, welding the connecting bridge middle segment and the connecting bridge segments at both ends to complete the main body construction; S70, installing the bridge accessory components, specifically including: main cable installation and pull rod installation.

2. The construction method of a high air suspension cable-stayed bridge according to claim 1, characterized in that, In step S202, before the support is installed and positioned, the support installation coordinates are first adjusted according to the actual measurement data to eliminate the error caused by the main tower deformation and ensure that the installed support is located on the same horizontal straight line; the support is temporarily welded and fixed by using the measure steel plate before welding to prevent welding deformation and deviation, and the support is fixed by using the angle welding skip welding mode to ensure that the support is in the locked state.

3. The construction method of a high air suspension cable-stayed bridge according to claim 1, characterized in that, In step S30, the specific construction steps include: S301, cantilever wing area hoisting: before hoisting, a plurality of lifting lugs are arranged on the connecting bridge segment, wherein the lifting point of the connecting bridge segment close to the core tube on the tower crane hook is provided with an adjusting drop chain, and the lifting point on the other side directly uses a steel wire rope; during hoisting, after the connecting bridge segment is hoisted to the vicinity of the outer side beam, the moving direction is controlled by using a traction rope and the moving distance of the connecting bridge segment is controlled by adjusting the tower crane, and after the connecting bridge segment is moved to the specified position, the connecting bridge segment is slowly transferred to the sliding platform; after hoisting is completed, the connecting bridge segment is pulled up by adjusting the drop chain, a temporary support stool is installed, and finally the connecting bridge segment is placed on the support stool; S302, installation assembly welding and correction: due to insufficient operation space at the end of the connecting bridge segment, a support stool is first arranged, and a lifting device is arranged on the support stool to raise the connecting bridge as a whole, wherein the support stool is arranged in the same way as in step S301, and when the connecting bridge segment is raised as a whole to meet the operation space at the end of the connecting bridge, the connecting bridge segment is temporarily fixed by using a code plate and welded.

4. The construction method of a high air suspension cable-stayed bridge according to claim 3, characterized in that, In step S302, the bridge section is divided into two parts, and the specific welding steps are as follows: first, the whole bridge section is lifted by adjusting the chain, then the bottom support stool is quickly removed, finally the first part of the bridge section is placed at the designed position, and the welding of the first part of the bridge section and the support is completed; after the welding of the first part of the bridge section is completed, the temporary support column is installed first, and then the bridge column is installed; when the second part of the bridge section is installed, it is fixed by the code plate, after installation, the overall linearity of the bridge deck is adjusted by the lifting device and the support stool, after the linear adjustment is completed, the whole welding is carried out again.

5. The construction method of a high air suspension cable-stayed bridge according to claim 1, characterized in that, In step S40, the ground welding of the middle section of the bridge is carried out as follows: first, set up the steel bridge assembly measures on the ground, after the assembly measures are set up, place the bridge section on the ground assembly measures, temporarily connect and fix with the code plate, after the whole bridge section is assembled, weld the bridge section to form a whole.

6. The construction method of a high air suspension cable-stayed bridge according to claim 5, characterized in that, In step S50, before the middle section of the bridge is installed, the bridge welding operation platform needs to be inserted into the rail groove steel of the bridge, and then moved to the inner side through the directional pulley at the bottom of the operation platform, then the whole bridge middle section is lifted to the specified position by using the tower crane, finally the weld joint of the bridge body top is completed and the bridge welding operation platform is moved to the joint position to complete the weld overhead welding of the bridge bottom.

7. The construction method of a high air suspension cable-stayed bridge according to claim 1, characterized in that, In step S70, the main cable installation is carried out as follows: one end of the main cable is lifted directly by using a tower crane, the other end of the main cable is placed on the bridge deck, and the traction trolley is set at the bottom of the main cable, the height of the tower crane is slowly lowered at the same time, until the end of the main cable is moved to the inside of the core tube, and the other side of the main cable is slowly placed on the bridge deck.

8. The construction method of a high air suspension cable-stayed bridge according to claim 7, characterized in that, In step S70, the installation of the pull rod is carried out as follows: the main cable is lifted to a certain height, then the cable clamp of the pull rod is installed according to the positioning point of the cable clamp on the main cable, and the cable head at the upper end of the boom is installed, so that the boom is inclined and suspended on the main cable; after the main cable is in place, the cable head at the lower end of the boom is installed, and the tension is symmetrically tightened from both sides to the middle.

9. The construction method of a high air suspension cable-stayed bridge according to claim 8, characterized in that, After the installation of the pull rod is completed, the vertical acceleration of the bridge deck under environmental excitation and pedestrian excitation needs to be tested, and TMD is made according to the test results, after the processing and manufacturing are completed, the TMD is installed into the box girder, and the natural frequency and vertical acceleration of the bridge are tested again; The test data is sorted and compared with the test data without TMD, and finally the test report is provided.

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