Corrugated steel web cantilever assembly and high-precision closure construction method

Abstract

The invention provides a corrugated steel web cantilever assembly and high-precision closure construction method, which comprises the following steps: mounting a corrugated steel web by adopting cantilever assembly, setting a pre-camber according to a model calculation result when the corrugated steel web is processed, and arranging a cable-stayed system in the middle of the corrugated steel web in a cantilever assembly process. And the cantilever line type of the corrugated steel web is finely adjusted through the cable-stayed system before closure. The problems that the construction risk is high and the lower bracket of the cross beam is difficult to dismantle due to the fact that a large bracket needs to be installed and dismantled in the air in traditional bracket method construction are solved, and high-precision closure of corrugated steel web cantilever assembly is achieved.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a method for cantilever assembly and high-precision closure of corrugated steel web plates. Background Technology

[0002] With the continuous development and progress of suspension bridge design and construction, steel-concrete lightweight structures (i.e. steel-concrete structures or steel-concrete beams) are gradually replacing traditional reinforced concrete structures for pylon beams. Steel-concrete structures mainly include corrugated steel webs and top and bottom plates formed by cast-in-place concrete at the top and bottom of the corrugated steel webs, respectively.

[0003] The general construction method for steel-concrete crossbeams is the bracket method, which involves erecting a bracket under the base slab, installing the corrugated steel web on the bracket (closing), then installing the reinforcing bars (prestressed steel strands), casting the base slab in place and tensioning the prestress, and finally erecting a disc-lock scaffold inside the box girder on the base slab for casting the top slab in place.

[0004] The advantages of the bracket method are that the construction is simple and there are successful cases with experience to draw on. However, the disadvantages are that the construction process involves the installation, dismantling and welding of large steel brackets in the air, which poses a high construction risk. In addition, after the steel-concrete crossbeam is constructed, the bottom bracket of the crossbeam is removed by tower crane, which is limited by space, difficult to dismantle and has a high construction risk. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems mentioned in the background art above, and provides a method for cantilever assembly and high-precision closure of corrugated steel web, so as to reduce the amount of work in the air and reduce construction risks.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for cantilever assembly and high-precision closure of a corrugated steel web, wherein the corrugated steel web comprises two embedded sections and two cantilever assemblies. The two embedded sections are embedded opposite each other within the tower body of the main tower. Each cantilever assembly comprises several cantilever sections spliced ​​sequentially. One end of each of the two cantilever assemblies is connected to one of the two embedded sections, and the other ends of the two cantilever assemblies are connected together to achieve closure. The method for cantilever assembly and high-precision closure of the corrugated steel web includes the following steps: S1. Before construction, a simulation calculation of the cantilever assembly of the corrugated steel web is performed. Based on the calculated deflection due to its own weight, a pre-camber is added during the fabrication of the corrugated steel web to resist the deflection caused by gravity during the cantilever assembly of the corrugated steel web. S2, When pouring the main tower body, construct the embedded section of the corrugated steel web, and lift the hydraulic climbing formwork used for tower body construction to a designated position above the embedded section. S3. Construct the cantilever assembly of the corrugated steel web. During the construction of the cantilever section, for the cantilever section located directly below the hydraulic climbing formwork, use a lifting device to connect the cantilever section to the tower crane. The tower crane lifts the cantilever section connected to the lifting device from below the hydraulic climbing formwork. After being lifted into position, connect the cantilever section to the pre-embedded section. Continue to construct the remaining cantilever sections of the corrugated steel web. During the cantilever assembly, connect the cantilever section directly to the tower crane. The tower crane lifts the cantilever section. After being lifted into position, connect the cantilever section to the previous section. During the cantilever assembly process, a cable tie system is also installed on the cantilever section in the middle of the cantilever assembly to adjust the shape of the corrugated steel web. S4, during the closure, the position of the cantilever ends of the two suspension assemblies is adjusted by the cable tie system, and then the joint of the two suspension assemblies is drilled on site and bolts are installed to complete the closure.

[0007] Further, in step S2, the suspended section and the counterweight are respectively connected to the opposite ends of the lifting device; the lifting device is connected to the tower crane, and the tower crane lifts the suspended section connected to the lifting device from below the hydraulic climbing formwork, so that the end of the lifting device connected to the suspended section extends into the hydraulic climbing formwork directly below, thereby connecting one end of the suspended section with the pre-embedded section.

[0008] Furthermore, lifting lugs are welded to the top surface of the suspended section, and the lifting lugs are connected to a lifting device or tower crane via lifting wire ropes.

[0009] Furthermore, in step S3, when two adjacent cantilever sections and when the cantilever section is connected to the pre-embedded section, temporary fixing is first done using punch pins, and then a welding platform is installed at the joint to install the joint bolts.

[0010] Furthermore, a welding platform is installed at the joint of two adjacent cantilever sections and at the joint of the cantilever section and the pre-embedded section. The welding platform includes a support frame, several steel planks and a climbing ladder. The top of the support frame is fixed to the top surface of the corresponding joint. Several steel planks are spaced apart along the joint length of the corresponding joint. The climbing ladder is fixed to the support frame and is set adjacent to the steel planks so that users can install the joint bolts on different steel planks.

[0011] Furthermore, a pad is welded to the lifting lug, and a limit frame is welded to the top surface of the suspended section, with the limit frame located in front of the lifting lug; an extension plate is vertically fixed to the top of the support frame, the extension plate is supported on the top surface of the suspended section and passes through the limit frame, a limit plate is welded to the extension plate, and the limit plate abuts against the side of the pad facing away from the limit frame.

[0012] Furthermore, the suspended section includes two web portions arranged at intervals and a partition portion connecting the two web portions. During the suspension process of the suspended section in step S3, temporary horizontal connecting rods are also set at the top and bottom of the web portions of the suspended section to connect the two web portions.

[0013] Furthermore, the temporary horizontal connecting rod includes two straight rods and an inclined rod located between the two straight rods. The two straight rods are arranged in parallel and spaced apart, and each straight rod is vertically connected to the two web portions. The inclined rod is inclined relative to the straight rods and is fixedly connected to the two web portions.

[0014] Furthermore, the inclined cable system includes an inclined cable and a hand-operated hoist. One end of the inclined cable is threaded through a lug located on the suspended section in the middle of the suspended assembly. The other end of the inclined cable passes through a lug plate pre-embedded in the tower body and is connected to the hand-operated hoist. The hand-operated hoist is used to tighten the inclined cable to adjust the position of the cantilever end of the corresponding suspended assembly.

[0015] Furthermore, if there is a deviation in the elevation of the cantilever ends of the two sets of cantilever assemblies, a steel crossbeam is temporarily welded to the cantilever end of the cantilever assembly on the side with the lower elevation, and a jack is installed on the top surface of the cantilever end of the cantilever assembly on the side with the higher elevation, so that the jack directly acts on the steel crossbeam to correct the elevation of the closure joint.

[0016] By adopting the above technical solution, the present invention has the following beneficial effects: The above-mentioned cantilever assembly and high-precision closure construction method for corrugated steel web plates uses cantilever assembly for the installation of corrugated steel web plates, avoiding the high construction risks and difficulties in dismantling the brackets under the crossbeams caused by the need for aerial installation and dismantling of large brackets in traditional bracket construction methods.

[0017] The above-mentioned cantilever assembly and high-precision closure construction method for corrugated steel web plates addresses the issue of controlling the cantilever alignment of the corrugated steel web plates. During the fabrication of the corrugated steel web plates, a pre-camber is set based on model calculations. Simultaneously, a diagonal bracing system is installed in the middle of the corrugated steel web plates during the cantilever assembly process. Before closure, the cantilever alignment of the corrugated steel web plates is fine-tuned using the diagonal bracing system. Meanwhile, jacks are used to vertically adjust the vertical position of the cantilever ends of the corrugated steel web plates, and hand-operated hoists are used to horizontally adjust the position of the cantilever ends, achieving high-precision closure of the cantilever assembly of the corrugated steel web plates.

[0018] The above-mentioned cantilever assembly and high-precision closure construction method for corrugated steel web cantilever sections where two cantilever assemblies are connected to achieve closure involves machining bolt holes at the end used for assembly with the previous cantilever section in the prefabrication plant, and drilling and installing joint bolts on the end used for closure with the other cantilever assemblies on site. This avoids situations where joint bolts are difficult to install due to construction errors.

[0019] The above-mentioned cantilever assembly and high-precision closure construction method for corrugated steel web plates addresses the issue of low horizontal stiffness of the corrugated steel web plates during cantilever assembly by setting temporary horizontal connecting members at the top and bottom of the corrugated steel web plates to form a frame structure, thereby enhancing overall stability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the construction state of the cantilever assembly and high-precision closure construction method of corrugated steel web plate according to a preferred embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the welding platform used in the cantilever assembly and high-precision closure construction method of corrugated steel web, which is a preferred embodiment of the present invention.

[0022] Figure 3 for Figure 2 Enlarged view of the structure at point A.

[0023] Figure 4 for Figure 2 The right view.

[0024] Figure 5 for Figure 4 Enlarged view of the structure at point B.

[0025] Figure 6 This is a front view of the corrugated steel web in the cantilever assembly and high-precision closure construction method of the corrugated steel web according to a preferred embodiment of the present invention.

[0026] Figure 7 for Figure 6 Top view.

[0027] Figure 8 This is a schematic diagram of another construction state of the cantilever assembly and high-precision closure construction method of the corrugated steel web plate, which is a preferred embodiment of the present invention.

[0028] Figure 9 This is a schematic diagram of the connection between the inclined steel wire rope and the ear plate in the cantilever assembly and high-precision closure construction method of the corrugated steel web plate, which is a preferred embodiment of the present invention.

[0029] Figure 10 This is a schematic diagram of the connection between the inclined steel wire rope and the suspended section in the cantilever assembly and high-precision closure construction method of the corrugated steel web plate, which is a preferred embodiment of the present invention.

[0030] Figure 11 This is a schematic diagram of the installation of jacks in the cantilever assembly and high-precision closure construction method of corrugated steel web plate according to a preferred embodiment of the present invention. Only the cantilever end of the cantilever assembly is shown in the figure.

[0031] Explanation of main component symbols 100. Corrugated steel web; 10. Embedded section; 20. Suspension assembly; 21. Suspension section; 211. Web section; 213. Partition section; 214. Lifting lug; 200. Hydraulic climbing formwork; 300. Lifting tool; 400. Tower crane; 500. Cable tie system; 510. Cable tie wire rope; 520. Hand chain hoist; 530. Jack; 540. Rope clamp; 550. Horizontal section of steel. Beam; 600, Counterweight; 700, Welding Platform; 710, Support Frame; 720, Steel Plank; 730, Climbing Ladder; 740, Pad; 750, Limiting Frame; 751, Limiting Hole; 760, Extension Plate; 770, Limiting Plate; 780, Temporary Flat Connecting Member; 781, Straight Rod; 783, Diagonal Rod; 800, Shackle; 900, Tower Body; 910, Ear Plate. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] Please also see Figures 1 to 10 A preferred embodiment of the present invention provides a cantilever assembly and high-precision closure construction method for corrugated steel web plates. The method uses cantilever assembly to install the corrugated steel web plate 100, which reduces the amount of work in the air and lowers the construction risk. At the same time, the method designs and adopts corresponding construction measures to achieve the purpose of rapid installation and high-precision closure of the corrugated steel web plate 100.

[0036] Please see Figure 6 and Figure 7 The corrugated steel web 100 includes two embedded sections 10 and two cantilever assemblies 20. The two embedded sections 10 are embedded relatively within the tower body 900 of the main tower. Each cantilever assembly 20 includes several cantilever segments 21 spliced ​​sequentially. One end of each cantilever assembly 20 is connected to one of the two embedded sections 10, and the other ends of the two cantilever assemblies 20 are connected together to achieve closure. Each cantilever segment 21 includes two web portions 211 spaced apart from each other and a partition portion 213 connecting the two web portions 211. Lifting lugs 214 for hoisting are welded to the top surface of the web portions 211 of the cantilever segment 21. Figure 2 As shown. The cantilever assembly and high-precision closure construction method for corrugated steel web plates includes the following steps: S1. Before the construction of the corrugated steel web 100, a cantilever assembly simulation calculation of the corrugated steel web 100 is performed. Based on the calculated self-weight deflection result, a pre-camber is added during the processing of the corrugated steel web 100 to resist the deflection caused by gravity during the cantilever assembly process.

[0037] In this embodiment, based on the calculated self-weight deflection, the method for adding a pre-camber during the fabrication of the corrugated steel web 100 is as follows: First, the self-weight deflection of the single-segment cantilever section 21 is calculated. Based on the actual installation method of the cantilever section 21 and previous experience in corrugated steel web installation, a pre-camber is added to the single-segment cantilever section 21. In this embodiment, the self-weight deflection of the single-segment cantilever section 21 is approximately 1.5-2.8 mm. Based on the actual installation method of the cantilever section 21 and previous experience in corrugated steel web installation, the pre-camber of the single-segment cantilever section 21 is increased to 5 mm. After the pre-camber is set, the height of the cantilever section 21 on the side closest to the tower body 900 remains unchanged, while the height of the cantilever section 21 on the side closest to the center of the two tower bodies 900 increases by 5 mm.

[0038] In this embodiment, the cantilever segment 21 is connected to the corresponding embedded segment 10 and to adjacent cantilever segments 21 by bolting. Specifically, for the cantilever segment 21 connecting two cantilever assemblies 20 to achieve closure, the end used for assembly with the preceding segment 21 has its bolt holes machined in the prefabrication plant, while the end used for closure with another cantilever assembly 20 has its bolt holes machined on-site. This avoids difficulties in installing the bolts due to construction errors. For the remaining cantilever segments 21 of the embedded segment 10 and the cantilever assembly 20, the bolt holes at both ends are machined in the prefabrication plant to reduce the amount of work at height and lower the risks associated with high-altitude construction.

[0039] S2, when pouring the tower body 900 of the main tower, construct the embedded section 10 of the corrugated steel web 100, and lift the hydraulic climbing formwork 200 used for the construction of the tower body 900 of the main tower to the designated position above the embedded section 10.

[0040] S3, perform the cantilever assembly construction of the corrugated steel web 100 cantilever assembly group 20: such as Figure 1As shown, during the construction of the suspended section 21, for the suspended section 21 located directly below the hydraulic climbing formwork 200, the suspended section 21 is connected to the tower crane 400 using the lifting device 300. The tower crane 400 lifts the suspended section 21 connected to the lifting device 300 from below the hydraulic climbing formwork 200. After being lifted into position, the suspended section 21 is connected to the pre-embedded section 10. The suspension of the remaining suspended sections 21 of the corrugated steel web 100 continues. During the suspension, the suspended section 21 is directly connected to the tower crane 400. The tower crane 400 lifts the suspended section 21. After being lifted into position, the suspended section 21 is connected to the previous suspended section 21. During the suspension process, a cable tie system 500 is also installed on the suspended section 21 in the middle of the suspension assembly 20 to adjust the alignment of the corrugated steel web 100.

[0041] In this embodiment, the lifting device 300 is generally a long, narrow rod. For the suspended section 21 located directly below the hydraulic climbing formwork 200, during hoisting, the lifting lugs 214 and counterweights 600 of the suspended section 21 are connected to opposite ends of the lifting device 300 via hoisting wire ropes; then, the lifting device 300 is connected to the tower crane 400 via hoisting wire ropes. The tower crane 400 lifts the suspended section 21 connected to the lifting device 300 from below the hydraulic climbing formwork 200, causing one end of the lifting device 300 connected to the suspended section 21 to extend directly below the hydraulic climbing formwork 200, thereby connecting one end of the suspended section 21 to the embedded section 10. When bolting the suspended section 21 to the embedded section 10, temporary fixing is first achieved using punch pins, followed by the installation of the joint bolts at the connection point of the suspended section 21 and the embedded section 10 using a welding platform 700. After the joint bolts are installed, the joint is welded. The counterweight 600 can be made of concrete blocks or similar materials, and its weight is roughly the same as that of the suspended section 21 to be hoisted, so as to ensure that the lifting device 300 can remain stable during the hoisting process.

[0042] For the remaining suspended sections 21, since they are not directly below the hydraulic climbing formwork 200, the hydraulic climbing formwork 200 will not obstruct the lowering of the tower crane 400 hook. Therefore, during the suspended assembly, the lifting lugs 214 of the suspended section 21 can be directly connected to the tower crane 400 via lifting wire ropes. The tower crane 400 lifts the suspended section 21, and after it is lifted into position, it is connected to the previous suspended section 21. When bolting two adjacent suspended sections 21, temporary fixation is first achieved using punch pins. Then, a welding platform 700 is installed at the connection point of the two adjacent suspended sections 21 to install the joint bolts. After the joint bolts are installed, the joint is welded.

[0043] In this embodiment, a welding platform 700 is installed at the joint of two adjacent cantilever sections 21 and at the joint between the cantilever section 21 and the embedded section 10. For example... Figures 2 to 5As shown, the welding platform 700 includes a support frame 710, several steel planks 720, and climbing ladders 730. The top of the support frame 710 is fixed to the top surface of the corresponding splicing point. Specifically, a pad 740 is welded to the lug 214 of the suspended splice section 21, and a limit frame 750 is welded to the top surface of the suspended splice section 21, with the limit frame 750 located in front of the lug 214. An extension plate 760 is vertically fixed to the top of the support frame 710, supporting the top surface of the suspended splice section 21 and passing through the limit frame 750. A limit plate 770 is welded to the extension plate 760, and the limit plate 770 abuts against the side of the pad 740 facing away from the limit frame 750. The limit frame 750 is provided with a limit groove 751, and the extension plate 760 passes through the limit groove 751, thereby restricting the extension plate 760 along the... Figure 3 The extension plate 760 can move in the left-right and up-down directions. Because the limiting plate 770 and the pad 740 abut against the side facing away from the limiting frame 750, the cooperation between the limiting plate 770 and the pad 740 restricts the extension plate 760 from moving along... Figure 3 The forward and backward movement of the support frame 710, through the cooperation of the limiting frame 750, the limiting plate 770, and the pad 740, prevents the support frame 710 from detaching. Several steel planks 720 are spaced apart along the joint length of the corresponding splice. The steel planks 720 are fixed to the support frame 710, providing a working platform for workers to weld and install bolts. A climbing ladder 730 is fixed to the support frame 710 and installed adjacent to the steel planks 720. Because the height difference between adjacent steel planks 720 is significant, a climbing ladder 730 is installed near the steel planks 720 to allow users to install joint bolts and weld joints on different steel planks 720.

[0044] In this embodiment, during the cantilever assembly process of the cantilever segment 21, temporary horizontal connecting rods 780 are also provided at the top and bottom of the web portion 211 of the cantilever segment 21. The two web portions 211 are connected by the temporary horizontal connecting rods 780, so that the cantilever segment 21 forms a frame structure. Specifically, the temporary horizontal connecting rods 780 include two straight rods 781 and a diagonal rod 783 located between the two straight rods 781. The two straight rods 781 are arranged in parallel and spaced apart, and each straight rod 781 is vertically connected to the two web portions 211; the diagonal rod 783 is inclined relative to the straight rods 781 and is fixedly connected to the two web portions 211.

[0045] The cable-stayed system 500 includes a cable-stayed steel wire rope 510 and a hand-operated hoist 520. One end of the cable-stayed steel wire rope 510 passes through a lug 214 located on the suspended section 21 in the middle of the suspended assembly 20, and is fixed to the lug 214 by a rope clamp 540. The other end of the cable-stayed steel wire rope 510 passes through a pre-embedded ear plate 910 on the tower body 900 and is then connected to the hand-operated hoist 520. In this embodiment, both ends of the cable-stayed steel wire rope 510 are connected to the lug 214 and the ear plate 910 respectively by shackles 800. Specifically, both the lug 214 and the ear plate 910 are equipped with shackles 800, and two shackles 800 are passed through each end of the cable-stayed steel wire rope 510. The structure of the shackles 800 is prior art and will not be described in detail here for brevity.

[0046] S4. During the closure, the position of the cantilever ends of the two suspension splice groups 20 is adjusted by the inclined cable system 500. Then, the splice joint of the two suspension splice groups 20 is drilled on site and the splice bolts are installed. The splice joint is then welded to complete the closure.

[0047] In this embodiment, the hand-operated hoist 520 is used to tighten the inclined steel wire rope 510 to adjust the position of the cantilever end of the corresponding suspension assembly 20. After the horizontal position of the cantilever ends of the two suspension assemblies 20 is adjusted by the inclined system 500 and the cantilever ends of the two suspension assemblies 20 are horizontally adjusted into place, the other end of the inclined steel wire rope 510 can be fixed to the ear plate 910 by the rope clamp 540, thereby fixing the inclined steel wire rope 510 and positioning the cantilever end of the suspension assembly 20; then the hand-operated hoist 520 can be removed from the inclined steel wire rope 510.

[0048] Please see also Figure 11 If there is a deviation in the elevation of the cantilever ends of the two sets of cantilever assemblies 20, a steel crossbeam 550 is temporarily welded to the cantilever end of the cantilever assembly 20 on the lower elevation side, and a jack 530 is set on the top surface of the cantilever end of the cantilever assembly 20 on the higher elevation side, so that the jack 530 directly acts on the steel crossbeam 550 to correct the elevation deviation of the closure joint.

[0049] The above-mentioned cantilever assembly and high-precision closure construction method for corrugated steel web plates uses cantilever assembly to install the corrugated steel web plate 100, avoiding the high construction risks and difficulties in dismantling the brackets under the crossbeams caused by the need for aerial installation and dismantling of large brackets in traditional bracket construction.

[0050] The above-mentioned cantilever assembly and high-precision closure construction method for corrugated steel web plates addresses the issue of controlling the cantilever alignment of the corrugated steel web plate 100. During the fabrication of the corrugated steel web plate 100, a pre-camber is set based on model calculations. Simultaneously, a cable-stayed system 500 is installed in the middle of the corrugated steel web plate 100 during the cantilever assembly process. Before closure, the cantilever alignment of the corrugated steel web plate 100 is finely adjusted using the cable-stayed system 500. Meanwhile, jacks 530 are used to vertically adjust the vertical position of the cantilever ends of the corrugated steel web plate 100, and hand-operated hoists 520 are used to horizontally adjust the position of the cantilever ends of the corrugated steel web plate 100, achieving high-precision closure of the cantilever assembly of the corrugated steel web plate 100.

[0051] In the above-mentioned cantilever assembly and high-precision closure construction method for corrugated steel web, for the cantilever segment 21 that connects the two cantilever assemblies 20 to achieve closure, during its processing, the end used to assemble with the previous cantilever segment 21 is processed with bolt holes in the prefabrication plant, and the end used to close with the other cantilever assemblies 20 is drilled on-site and bolts are installed, so as to avoid the situation where the bolts of the joint are difficult to install due to construction errors.

[0052] The above-mentioned cantilever assembly and high-precision closure construction method for corrugated steel web plate addresses the issue of low horizontal stiffness of corrugated steel web plate 100 during cantilever assembly. Temporary horizontal connecting rods 780 are installed at the top and bottom of corrugated steel web plate 100 to form a frame structure, thereby enhancing overall stability.

[0053] In existing technology, the main tower body 900 is usually constructed using hydraulic climbing formwork 200, which obstructs the lowering of the tower crane hook 400. Therefore, the suspended section 21 located directly below the hydraulic climbing formwork 200 cannot be lifted and lowered by the tower crane 400 for installation. Furthermore, the corrugated steel web 100 is typically installed at a higher position, and using a truck crane for installation would be costly.

[0054] The above-mentioned cantilever assembly and high-precision closure construction method for corrugated steel web plates utilizes a lifting device 300 to install the cantilever section 21 directly below the hydraulic climbing formwork 200. A tower crane 400 lifts the cantilever section 21 connected to the lifting device 300 from below the hydraulic climbing formwork 200. The counterweight 600 and the cantilever section 21 are symmetrically positioned relative to the hook of the tower crane 400. During the lifting process, the hook of the tower crane 400 does not need to be lowered directly below the hydraulic climbing formwork 200 to allow the cantilever section 21 to be inserted into the pre-embedded section 10 located directly below the hydraulic climbing formwork 200 for connection. This avoids the hydraulic climbing formwork 200 obstructing the lowering of the tower crane 400's hook, solving the problem of the hydraulic climbing formwork 200 affecting the lowering of the cantilever section 21 by the tower crane 400. Furthermore, compared to using a truck crane, the construction cost is lower.

[0055] The above description is a detailed description of the preferred embodiments of the present invention. However, the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modifications made under the technical spirit of the present invention should fall within the patent scope covered by the present invention.

Claims

1. A method for cantilever assembly and high-precision closure of a corrugated steel web, wherein the corrugated steel web comprises two embedded sections and two cantilever assemblies, the two embedded sections are embedded opposite each other within the tower body of the main tower, each cantilever assembly comprises several cantilever sections spliced ​​sequentially, one end of each of the two cantilever assemblies is connected to the two embedded sections respectively, and the other ends of the two cantilever assemblies are connected together to achieve closure, characterized in that... The method for cantilever assembly and high-precision closure of the corrugated steel web includes the following steps: S1. Before construction, a simulation calculation of the cantilever assembly of the corrugated steel web is performed. Based on the calculated deflection due to its own weight, a pre-camber is added during the fabrication of the corrugated steel web to resist the deflection caused by gravity during the cantilever assembly of the corrugated steel web. S2, When pouring the main tower body, construct the embedded section of the corrugated steel web, and lift the hydraulic climbing formwork used for tower body construction to a designated position above the embedded section. S3. Construct the cantilever assembly of the corrugated steel web. During the construction of the cantilever section, for the cantilever section located directly below the hydraulic climbing formwork, use a lifting device to connect the cantilever section to the tower crane. The tower crane lifts the cantilever section connected to the lifting device from below the hydraulic climbing formwork. After being lifted into position, connect the cantilever section to the pre-embedded section. Continue to construct the remaining cantilever sections of the corrugated steel web. During the cantilever assembly, connect the cantilever section directly to the tower crane. The tower crane lifts the cantilever section. After being lifted into position, connect the cantilever section to the previous section. During the cantilever assembly process, a cable tie system is also installed on the cantilever section in the middle of the cantilever assembly to adjust the shape of the corrugated steel web. S4, during the closure, the position of the cantilever ends of the two suspension assemblies is adjusted by the cable tie system, and then the joint of the two suspension assemblies is drilled on site and bolts are installed to complete the closure.

2. The cantilever assembly and high-precision closure construction method for corrugated steel web plates as described in claim 1, characterized in that, In step S2, the suspended section and the counterweight are connected to the opposite ends of the lifting device; the lifting device is connected to the tower crane, and the tower crane lifts the suspended section connected to the lifting device from below the hydraulic climbing formwork, so that the end of the lifting device connected to the suspended section extends into the hydraulic climbing formwork directly below, thereby connecting one end of the suspended section with the pre-embedded section.

3. The cantilever assembly and high-precision closure construction method for corrugated steel web plates as described in claim 2, characterized in that, The top surface of the suspended section is welded with lifting lugs, which are connected to a lifting device or tower crane via lifting wire ropes.

4. The cantilever assembly and high-precision closure construction method for corrugated steel web plates as described in claim 3, characterized in that, In step S3, when two adjacent cantilever sections are connected, and when the cantilever section is connected to the pre-embedded section, temporary fixing is first done using punch pins, and then a welding platform is installed at the joint to install the joint bolts.

5. The cantilever assembly and high-precision closure construction method for corrugated steel web plates as described in claim 4, characterized in that, A welding platform is installed at the joint of two adjacent cantilever sections and at the joint of a cantilever section and a pre-embedded section. The welding platform includes a support frame, several steel planks and a climbing ladder. The top of the support frame is fixed to the top surface of the corresponding joint. Several steel planks are spaced apart along the joint length of the corresponding joint. The climbing ladder is fixed to the support frame and is set adjacent to the steel planks so that users can install the joint bolts on different steel planks.

6. The cantilever assembly and high-precision closure construction method for corrugated steel web plates as described in claim 5, characterized in that, A pad is welded to the lifting lug, and a limit frame is welded to the top surface of the suspended section. The limit frame is located in front of the lifting lug. An extension plate is vertically fixed to the top of the support frame. The extension plate is supported on the top surface of the suspended section and passes through the limit frame. A limit plate is welded to the extension plate, and the limit plate abuts against the side of the pad facing away from the limit frame.

7. The cantilever assembly and high-precision closure construction method for corrugated steel web plates as described in claim 1, characterized in that, The suspended section includes two web sections that are spaced apart from each other and a partition section that connects the two web sections. During the suspension process of the suspended section in step S3, temporary horizontal connecting rods are also set at the top and bottom of the web sections of the suspended section to connect the two web sections.

8. The cantilever assembly and high-precision closure construction method for corrugated steel web plates as described in claim 7, characterized in that, The temporary horizontal connecting member includes two straight rods and an inclined rod located between the two straight rods. The two straight rods are arranged in parallel and spaced apart. Each straight rod is vertically connected to the two web portions. The inclined rod is inclined relative to the straight rods and is fixedly connected to the two web portions.

9. The cantilever assembly and high-precision closure construction method for corrugated steel web plates as described in claim 3, characterized in that, The inclined cable system includes an inclined cable and a hand-operated hoist. One end of the inclined cable is threaded through a lug on the suspended section in the middle of the suspended assembly. The other end of the inclined cable passes through a pre-embedded lug plate on the tower body and is connected to the hand-operated hoist. The hand-operated hoist is used to tighten the inclined cable to adjust the position of the cantilever end of the corresponding suspended assembly.

10. The cantilever assembly and high-precision closure construction method for corrugated steel web plates as described in claim 9, characterized in that, If there is a deviation in the elevation of the cantilever ends of the two sets of cantilever assemblies, a steel crossbeam is temporarily welded to the cantilever end of the cantilever assembly on the side with the lower elevation, and a jack is installed on the top surface of the cantilever end of the cantilever assembly on the side with the higher elevation, so that the jack directly acts on the steel crossbeam to correct the elevation of the closure joint.

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