WO2021128161A1

WO2021128161A1 - Method and apparatus for integrated and elevated construction of arched structure

Info

Publication number: WO2021128161A1
Application number: PCT/CN2019/128684
Authority: WO
Inventors: 王龙; 梁湖清; 魏崴; 蓝戊己; 陈臻颖; 温建明; 石开荣; 曹嘉利; 卢德辉
Original assignee: 广州建筑股份有限公司; 上海业升机电控制技术有限公司; 广州五羊建设机械有限公司
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2021-07-01
Also published as: CN113454306A; CN113454306B

Abstract

Disclosed is a method for the integrated and elevated construction of an arched structure, comprising the following steps: dividing an arched structure into an arched elevated structure and a post-assembly member at a support base, providing a jig on the ground, and completing the assembly of the elevated structure on the jig; threading and restraining a prestress dragline at both ends of the elevated structure and applying a temporary prestress force; using a hydraulic synchronized lifting system to lift the elevated structure to the location of a lower support structure to be mounted, mounting the post-assembly member at the support base, and connecting the elevated structure and the lower support structure to from an integrated body. Also disclosed are an assembled tensioning end node and an anchoring end node used for threading and restraining prestress draglines and for tensioning. The present invention can accurately control the deformation of the arched structure during lifting, thus ensuring accurate positioning for structure lifting and ensuring that the structure shape before and after mounting meets design requirements; meanwhile, applying and removing a temporary prestress force for construction are convenient, and the impact on the original structure is low.

Description

Construction method and device for integral lifting of arched structure

Technical field

The invention relates to a construction method for integral lifting, in particular to a device and construction method used for the integral lifting of an arched structure.

Background technique

With the development of my country’s economy and culture, more and more high-rise and complex buildings have appeared in the construction market in my country. There are many hidden dangers in high-altitude operations, long construction periods, difficult construction quality, and high engineering costs. Under the background, the overall construction method is used to transform high-altitude operations into ground operations, which greatly reduces the amount of high-altitude operations, and realizes the assembly and mechanization of structural installation, which greatly improves the construction efficiency, construction quality and construction of this type of structure construction Security of the process.

However, for the overall lifting construction of structures that require precise control of the deformation and shape of the structure, such as arched structures, there is no complete overall lifting construction method. The existing overall lifting construction method is suitable for the lifting construction of conventional structures such as trusses. If the traditional overall lifting construction method is applied to the arched structure, the lifting structure will be greatly deformed during the lifting process, and the structure will be lifted in place. Changes have occurred, making the installation of post-installation rods difficult or even impossible, and the construction quality is difficult to guarantee.

Therefore, there is an urgent need for an overall lifting construction method and device suitable for structures such as arched structures that require precise control of deformation and shape.

Summary of the invention

The purpose of the present invention is to provide a construction method for the overall improvement of the arched structure, which is reliable in quality, safe and economical, and has high construction efficiency.

The overall lifting construction method of the arched structure includes the following steps:

(1) Divide the arched structure into an arched lifting structure and post-installed components at the support, set a tire frame on the ground, and complete the assembling of the lifting structure on the tire frame;

(2) Set up assembled tension end nodes and anchored end nodes at both ends of the lifting structure, which are used to bundle prestressed cables, and apply temporary prestress to the prestressed cables shown, and set them on the lifting structure Lift the lifting point;

(3) Build a lifting frame on the lower support structure, and set up a hydraulic synchronous lifting system on the lifting frame. The hydraulic synchronous lifting system is connected to the lifting point through the lifting steel strand to prepare for the overall lifting of the lifting structure;

(4) Gradually increase the cylinder pressure of the hydraulic lifter until it reaches the required pressure for lifting, start lifting, lift the lifting structure to the lower support structure, and prepare to connect the lifting structure with the lower support structure;

(5) After being lifted into place, install the arched structure at the support base to connect the arched structure and the lower supporting structure to form a whole;

(6) After the installation is completed, unload each lifting point of the hydraulic lifting system in turn, remove the hydraulic lifting system and lifting frame, and remove the temporary prestressed cable, tension end node and anchor end node, so that the load of the arch structure is transferred to the lower part Supporting structure.

Among them, step (4) also includes

Commissioning inspection: commissioning the hydraulic lifting system, checking whether the lifting structural unit and all temporary measures for hydraulic synchronous lifting meet the construction requirements;

Try to increase: gradually increase the cylinder pressure of the hydraulic lifter, in order of 20%, 40%, 60%, 70%, 80%, 90%, 95%, and up to 100% of the required pressure for lifting;

Formal lifting: After lifting the lifting unit by about 150mm, pause the lifting, fine-tune the elevation of each lifting point of the lifting unit to make it level, let it stand for 4-12 hours, and conduct a comprehensive inspection of the hydraulic lifting equipment system and structural system, and then Then lift the lifting structure to the lower support structure.

Among them, in step (2), computer simulation is used to perform simulation analysis with the goal of no relative displacement at both ends of the lifted structure during the lifting process and no downward deflection of the lifted structure during the lifting process, to confirm that the lifting structure needs to be applied Temporary prestress.

Furthermore, according to the temporary prestress obtained by the computer simulation, the specification of the prestressed cable to be used is determined and the design of the tension end node and the anchor end node are carried out. The tension end node and the anchor end node adopt an assembled design.

In the case where more than one prestressed cable is required, the tension end nodes and anchor end nodes corresponding to the multiple prestressed cables are set.

The tension end nodes applied to multiple prestressed cables include: at least two hydraulic tensioners, each of which is used to tension a bunch of prestressed cables; at least two end supports, each end bearing The member is used to support a hydraulic tensioner, and each of the end supporting members includes an end plate welded together, at least one horizontal stiffening plate and at least one vertical stiffening plate. The end plate is provided with a cable hole, so The horizontal stiffening plate and the vertical stiffening plate are arranged on the end plate around the cable hole, the cable hole is used to pass through the pre-stressed cable, and the end bearing near the lifting structure is supported on and lifted The two sets of shear plates are connected through the bottom string of the structure and are connected as a whole through upper and lower connecting angles.

The anchoring end nodes applied to multiple prestressed stay cables include: at least two bottom anchors for fixing the prestressed stay cables; at least two end supports, each of which is used to support a bottom anchor, The end bearing includes end plates welded together, at least one horizontal stiffening plate and at least one vertical stiffening plate, the end plate is provided with a cable hole, and the horizontal stiffening plate and the vertical stiffening plate surround the A cable hole is provided on the end plate, the cable hole is used to pass through the prestressed cable, and two end supports are supported on two sets of shear plates that are connected through the lower string of the lifting structure, It is connected into a whole through upper and lower connecting angle steel;

The end bearing is provided with tooth grooves matching the shear plate on the vertical stiffening plate close to the lifting structure, and the shear plate is firmly buckled on the shear plate through the tooth grooves.

Each group of shear plates includes at least one shear plate.

When more than two prestressed cables are used, the shear plate also includes a shear plate for reinforcing and connecting two adjacent end bearing members on the same side of the lifting structure.

The tension end node and anchor end node adopt assembly design, which are assembled and assembled on site. The installation and disassembly are flexible and convenient, and have little impact on the original structure and appearance. It avoids the difficulty of conventional methods and has a greater impact on the original structure and appearance. Repair difficult shortcomings.

In the case that the required prestressed cable is a single prestressed cable, a tension end node and an anchor end node corresponding to the single prestressed cable are set.

The tension end node applied to a single prestressed cable includes: a hydraulic tensioner for tensioning the prestressed cable; an end bearing member for supporting the hydraulic tensioner, and the end bearing member It includes an end plate welded together, two clamping plates, two stiffening plates and a non-slip stiffening rib. The end plate is provided with a cable hole, and the clamping plate and the stiffening plate are arranged around the cable hole. On the end plate, the anti-slip stiffening rib is arranged on the end plate and welded to one of the clamping plates, and the cable hole is used to pass through the prestressed cable, and the clamping plate There is a card slot for the lower chord of the lifting truss of the lifting structure; the upper and lower perforations are respectively provided on the upper wing plate and the lower wing plate of the lower chord of the lifting truss of the lifting structure for passing through A single prestressed cable; a limit steering steel rod, arranged on the web of the lower chord, located between the upper and lower perforations, used to adjust the tension direction of the prestressed cable.

The anchoring end node applied to a single prestressed cable includes: a connecting plate arranged on the lower wing plate of the lower chord of the lifting truss of the lifting structure; the end of the prestressed cable is provided with a locking clip, and the lock The clamp is connected to the connecting plate through a pin.

When a single prestressed cable is used, the structure of the required tension end node and anchor end node is simpler, which is convenient for on-site installation and disassembly.

Using the arched structure integral lifting construction method according to the present invention can accurately control the deformation of the arched structure during the lifting process, ensure the precise positioning of the structure lifting and the structural form before and after installation to meet the design requirements, and change the traditional arched structure Due to the sudden change in rigidity and large deformation before and after the installation and fixation of the support, the overall situation that the construction is difficult to implement is improved, and a large number of high-altitude operations are converted into ground operations; the temporary prestress application and removal are convenient for construction and have little impact on the original structure. This construction method improves the environmental conditions of manual operations, reduces the source of danger, has a short construction period, high quality, and the construction process is safe and reliable, thereby saving construction time and costs as a whole.

Description of the drawings

Fig. 1 is a schematic diagram of the installation of an arched roof structure according to the first embodiment of the present invention;

Fig. 2 is a schematic diagram of assembling the lifting structure on the ground according to the first embodiment of the present invention;

3 is a schematic diagram of the installation of the lifting structure according to the first embodiment of the present invention after being lifted into place;

Fig. 4 is a schematic diagram of a completed installation of the arched roof structure according to the first embodiment of the present invention;

5 is a schematic diagram of the structure of a double-cable tension end node according to the first embodiment of the present invention;

6 is a schematic diagram of the structure of the middle end bearing member of the double-cable tension end node according to the first embodiment of the present invention;

Fig. 7 is a schematic diagram of the structure of a double-cable anchored end node according to the first embodiment of the present invention;

8 is a schematic diagram of the structure of a single-cable tension end node according to the second embodiment of the present invention;

9 is a cross-sectional view of a single cable tension end node according to the second embodiment of the present invention;

10 is a schematic diagram of the structure of the middle end bearing member of the single-cable tension end node according to the second embodiment of the present invention;

Fig. 11 is a schematic diagram of the structure of a single-cable anchored end node according to the second embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

Example one

As shown in Figure 1, the arched structure that requires overall lifting construction is the arched roof structure 2. The arched roof structure 2 needs to be installed on the lower support structure 1. The arched roof structure 2 includes the arched lifting structure 2-1 And the post-installation component 2-2 at the support. During installation, the lifting structure 2-1 is assembled on the ground, and then lifted to the lower support structure 1, and then the post-installation component 2-2 at the support is installed to lift the structure 2-1 is installed on the lower support structure 1.

As shown in Figures 2 to 4, the following steps are included during the overall lifting construction.

(1) As shown in FIG. 2, a tire frame 4 is set on the ground, and the arched lifting structure 2-1 is assembled on the tire frame 4.

(2) After the assembling is completed, the pre-stressed cables 3 are bundled at both ends of the lifting structure 2-1, and temporary pre-stress is applied. Set up the lifting point 8.

(3) A lifting frame 5 is built on the lower support structure 1, and a hydraulic synchronous lifting system 6 is set on the lifting frame 5. The hydraulic synchronous lifting system 6 is connected to the lifting point 8 through the lifting steel strand 7, which is the lifting structure 2-1 Be prepared for the overall improvement.

(4) When lifting, first debug the hydraulic lifting system and check whether the lifting structure unit and all temporary measures for hydraulic synchronous lifting meet the construction requirements. After confirming that it is correct, start to try to increase, the hydraulic lifter cylinder pressure is gradually increased, followed by 20%, 40% of the required pressure, under all normal conditions, continue to load to 60%, 70%, 80%, 90%, 95%, 100%. After the lifting unit is lifted by about 150mm, the lifting is suspended, and the elevation of each lifting point of the lifting unit is fine-tuned to make it level. Let it stand for 4-12 hours, and then conduct a comprehensive inspection of the hydraulic lifting equipment system and structural system; The lifting structure 2-1 is lifted into place, as shown in Figure 3.

(5) As shown in Figure 3, after being lifted into place, the arched structure at the support is installed with the post-installed member 2-2, so that the arched structure and the lower supporting structure 1 are connected to form a whole.

(6) As shown in Figure 4, unload the lifting points of the hydraulic lifting system in turn, remove the hydraulic lifting system 6, the lifting frame 5, and remove the temporary prestressed cable 3 by controlling the prestressed tensioner 9-1, and then remove it The tension end node 9 and the anchor end node 10 transfer the load of the arched structure to the lower supporting structure 1 to reach the design state. So far, the lifting and installation of the arched roof structure 2 is completed.

In step (2), it is necessary to calculate the required temporary prestress to confirm the required prestress cable setting.

In this embodiment, the arch structure span of the arched roof used is 60 meters, the spacing between the main trusses is 6 meters, the section height of the main truss is 2.5 meters, the ratio of rise to span is 1/10, and the upper and lower chords are square tubes. □170×5, the web rod adopts square tube □110×5, the material is Q345B, and the roof panel adopts 50mm thick sandwich color steel plate. Take a truss in the middle of the arched roof structure and perform computer simulation analysis of the overall lifting under the condition of whether temporary prestress is applied or not. The two ends of the lifted structure have no relative displacement during the lifting process and the lifted structure has no bottom during the lifting process. The simulation analysis is carried out for the target, and the comparative analysis results are shown in the table below.

According to the analysis, when the lifting structure 2-1 is directly lifted without taking measures, the rigidity of the lifted structure changes greatly compared with the designed state, resulting in a large mid-span deflection of 374mm, and a relatively large level at both ends of the structure. Deformation, relative elongation of 240mm, the overall lifting is difficult to install accurately in place.

By setting the temporary prestressing cable 3 to apply the prestress, the rigidity of the lifting structure 2-1 can be effectively controlled, and the deformation and shape of the lifting structure 2-1 during the lifting process can be adjusted and controlled. In this embodiment, an initial tension of 239kN is applied to the lifting structure 2-1. When the prestressing is completed, the two ends of the lifting structure 2-1 are relatively contracted by 14mm; the temporary prestressing cable 4 is anchored, and the lifting structure 2- 1 During the overall lifting process, the two ends are relatively elongated by 14mm. When lifting in place, the relative deformation of the two ends of the lifting structure 2-1 is zero, and the mid-span deflection is 25mm, which meets the requirements of installation accuracy and design.

When the initial tension of 267kN is applied to the lifting structure 2-1, when the pre-stress tension is completed, the lifting structure 2-1 just separates from the tire frame, the mid-span deflection during the lifting process is zero, and the two ends of the structure no longer have relative deformation. , The relative shrinkage of the two ends of the lifting structure 2-1 when it is lifted in place is 17mm, which meets the requirements of installation accuracy and design requirements.

According to the calculation and analysis results, 2 sets of temporary prestressed cables should be selected

The high-strength and low-relaxation prestressed steel strands have a stress ratio of 0.47～0.52.

Therefore, in this embodiment, 2 bundles

The high-strength and low-relaxation pre-stressed steel strands are used as temporary pre-stressed cables, and the pre-stressed cables are pierced by the tension end node 9 and the anchor end node 10 of the assembled design.

In order to facilitate the application and unloading of the temporary prestressing force, the tensioning and anchoring of the temporary prestressing force cable 3 is performed by a hydraulic tensioner. The structure of the tension end node 9 is shown in Fig. 5. The hydraulic tensioner 9-1 used to tension the two prestressed cables 3 is supported on the end support 9-2, and the two end supports 9-2 The upper and lower connecting angles 9-41 and 9-42 are connected as a whole and supported on the shear plate 9-3. The shear plate 9-3 adopts a through-type connection and the lower chord 9- of the lifting structure 2-1 6 Weld and connect together, and the size of shear plate 9-3 is determined by calculation. The two end bearing pieces 9-2 are connected with the upper and lower connecting angle steels 9-41 and 9-42 through high-strength bolts.

The end bearing 9-2 is assembled by welding and assembled end plates 9-21, horizontal stiffening plates 9-22, vertical stiffening plates 9-23 and 9-24, as shown in FIG. 6. Wherein, the end plate 9-21 is provided with a threading hole 9-25, and a connecting bolt hole 9-26 is provided at an appropriate position. The end bearing 9-2 is close to the vertical stiffening plate 9-24 of the lower chord 9-6 of the lifting structure, and a tooth groove matching the shear plate 9-3 is set on the vertical stiffening plate 9-24, which can be firmly buckled and hung on the shear plate. 9-3.

The structure of the anchored end node 10 is shown in Fig. 7, the temporary prestressed cable 3 is anchored and fixed by the bottom anchor 10-1, the bottom anchor 10-1 is supported on the end support 10-2, and the two end supports 10-2 The upper and lower connecting angle steels 10-41 and 10-42 are connected as a whole and supported on the shear plate 10-3. The end bearing 10-2, upper and lower connecting angles 10-41 and 10-42, the specifications and connection mode of the shear plate 10-3 are the same as those of the end bearing 9-2, upper and lower connecting angles 9-41 Same as 9-42, shear plate 9-3.

Example two

(2) After the assembling is completed, the pre-stressed cables 3 are bundled at both ends of the lifting structure 2-1, and temporary pre-stress is applied, and the temporary pre-stressed cables 3 are stretched to the control value, and the lifting structure 2-1 Set up the lifting point 8.

In step (2), calculate the required temporary prestress. If the required temporary prestress is small, only a single prestressed steel strand is required, and then the corresponding tension end node 9'and anchor end node 10' are performed. the design of.

As shown in Figure 8-9, when a single cable is used for pre-stressed tensioning, the upper and lower wing plates of the lower chord 9-6 of the lifting truss of the lifting structure are respectively provided with temporary pre-stressed cables at appropriate positions 3 The upper perforation 9-61 and the lower perforation 9-62 through the bundle, the limited steering steel bars 9'-3 are fixed on the webs on both sides to adjust the tension direction of the temporary prestressed cable 3 and reduce friction , The hydraulic tensioner 9-1 for tensioning the prestressed cable 3 is supported on the end support 9'-2, and the end support 9'-2 is clamped and supported on the lower chord 9-6 of the lifting truss .

The end bearing 9'-2 is assembled by welding of end plates 9'-21, clamping plates 9'-22, 9'-23, stiffening plates 9'-24, and non-slip stiffening ribs 9'-25, such as Shown in Figure 10. The end plate 9'-21 has holes for the temporary auxiliary pre-stressed cable 3 to pass through, and the ends of the clamping plates 9'-22 and 9'-23 are provided to match the lower chord 9-6 of the lifting truss Concave card slot.

The anchoring end node of the single-cable temporary auxiliary prestressed cable 3 is shown in Fig. 11. The temporary auxiliary pre-stressed cable 3 uses the locking clip 10'-1 provided at the end to pass through the pin and the connecting plate 10'-2 provided at the bottom of the lower chord of the lifting truss.

Based on the disclosure and teaching of the foregoing specification, those skilled in the art to which the present invention pertains can also make changes and modifications to the foregoing embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

An overall lifting construction method for an arched structure includes the following steps:

(1) Divide the arched structure into an arched lifting structure and post-installed components at the support, set a tire frame on the ground, and complete the assembling of the lifting structure on the tire frame;

(2) At both ends of the lifting structure, a tension end node and an anchor end node are respectively set to pass through the prestressed cables, and temporarily prestress is applied to the prestressed cables, and a lifting point is set on the lifting structure ；

(3) Build a lifting frame on the lower support structure, and set up a hydraulic synchronous lifting system on the lifting frame. The hydraulic synchronous lifting system is connected to the lifting point through the lifting steel strand to prepare for the overall lifting of the lifting structure;

(4) Gradually increase the cylinder pressure of the hydraulic lifter until it reaches the required pressure for lifting, start lifting, lift the lifting structure to the lower support structure, and prepare to connect the lifting structure with the lower support structure;

(5) After being lifted into place, install the arched structure at the support base to connect the arched structure and the lower supporting structure to form a whole;

(6) After the installation is completed, unload each lifting point of the hydraulic lifting system in turn, remove the hydraulic lifting system and lifting frame, and remove the temporary prestressed cable, tension end node and anchor end node, so that the load of the arch structure is transferred to the lower part Supporting structure.
The overall lifting construction method of an arched structure according to claim 1, wherein the step (4) comprises:

Debug the hydraulic lifting system and check whether the lifting structural unit and all temporary measures for hydraulic synchronous lifting meet the construction requirements;

Gradually increase the cylinder extension pressure of the hydraulic lifter, successively 20%, 40%, 60%, 70%, 80%, 90%, 95%, and up to 100% of the required pressure for lifting;

After lifting the lifting unit by about 150mm, pause the lifting, fine-tune the elevation of each lifting point of the lifting unit to make it level, let it stand for 4-12 hours, and conduct a comprehensive inspection of the hydraulic lifting equipment system and structural system, and then lift it The structure is lifted to the lower supporting structure, ready to connect the lifting structure with the lower supporting structure.
The overall lifting construction method of the arched structure according to claim 1, characterized in that, in the step (2), computer simulation is used to respectively make the two ends of the lifted structure have no relative displacement during the lifting process and the two ends of the lifted structure are lifted during the lifting process. The simulation analysis is carried out with the goal of no deflection of the structure to confirm the temporary prestress that needs to be applied to the lifting structure.
The overall lifting construction method of the arch structure according to claim 3, characterized in that the specifications of the prestressed cable and the design of the tension end node and the anchor end node are confirmed according to the temporary prestress.
The overall lifting construction method of the arched structure according to claim 4, wherein the pre-stressed cables are two bundles of pre-stressed cables.
The overall lifting construction method of the arch structure according to claim 5, wherein the tension end node comprises:

At least two hydraulic tensioners for tensioning pre-stressed cables;

At least two end supports, each of which is used to support a hydraulic tensioner, and the end supports include end plates connected by welding, at least one horizontal stiffening plate, and at least one vertical stiffening plate. A cable hole is opened on the end plate, the horizontal stiffening plate and the vertical stiffening plate are arranged on the end plate around the cable hole, and the cable hole is used to pass through the prestressed cable, two Each end bearing is connected into a whole through upper and lower connecting angle steel;

At least two sets of shear plates, the shear plates are used to connect the end bearing closest to the lifting structure with the lifting structure;

The shear plate and the lower chord of the lifting structure are fixed by a through-core connection.
The overall lifting construction method of the arched structure according to claim 5, wherein the anchoring end node comprises:

At least two bottom anchors for fixing the prestressed cable;

At least two end supports, each end support is used to support a bottom anchor, the end support includes an end plate welded together, at least one horizontal stiffening plate and at least one vertical stiffening plate, the end plate A cable hole is opened, the horizontal stiffening plate and the vertical stiffening plate are arranged on the end plate around the cable hole, and the cable hole is used to pass through the prestressed cable, and the end bearing The parts are connected into a whole through upper and lower connecting angle steel;

At least two sets of shear plates, the shear plates are used to connect the end bearing closest to the lifting structure with the lifting structure;

The shear plate and the lower chord of the lifting structure are fixed by a through-core connection.
The overall lifting construction method of the arched structure according to claim 5 or 6, characterized in that the vertical stiffening plate of the end bearing near the lifting structure is provided with a vertical stiffening plate that matches the shear plate The tooth grooves are used for the shear plate to be firmly buckled on the shear plate through the tooth grooves.
The overall lifting construction method of the arched structure according to claim 5 or 6, wherein each group of the shear plates includes at least one shear plate.
The overall lifting construction method of the arched structure according to claim 4, wherein the pre-stressed cable is a single pre-stressed cable.
The overall lifting construction method of the arched structure according to claim 10, wherein the tension end node comprises:

Hydraulic tensioner for tensioning the prestressed cable;

The end bearing is used to support the hydraulic tensioner, and the end bearing includes an end plate welded together, at least one clamping plate, at least one stiffening plate and at least one anti-skid stiffening rib, and the end plate is opened with The piercing hole, the card board and the stiffening plate are arranged on the end plate around the piercing hole, the anti-skid stiffening rib is arranged on the end plate, and is welded to the card plate, the The cable hole is used to pass through the prestressed cable, and the clamping plate is provided with a clamping slot for clamping on the lower chord of the lifting truss of the lifting structure;

The upper and lower perforations are respectively set on the upper wing plate and the lower wing plate of the lower chord of the lifting truss of the lifting structure for passing through a single prestressed cable;

The limit steering steel rod is arranged on the web of the lower chord and is located between the upper and lower perforations, and is used to adjust the tension direction of the prestressed cable.
The construction method for integral lifting of an arched structure according to claim 10, wherein the anchoring end node comprises:

The connecting plate is arranged on the lower wing plate of the lower chord of the lifting truss of the lifting structure;

The end of the prestressed cable is provided with a locking clip, and the locking clip is connected to the connecting plate through a pin.