Construction method for installing cable saddle after advanced erection of catwalk

Abstract

The invention relates to the technical field of bridge construction hoisting and transportation, and particularly discloses a construction method for installing a cable saddle after advanced erection of a catwalk, which comprises the following steps of: lifting a cable saddle grating and a reaction frame to a tower top, and pouring concrete after installation is completed; a bracket weighing cable and a bracket are erected between the two main towers by means of a traction system, then cable rotating saddles of the catwalk bearing cable are symmetrically arranged on the two sides of a cable saddle grid, the distance between the cable rotating saddles meets the main cable saddle hoisting space requirement, and then catwalk bearing cable installation is completed; the displacement frame is hoisted to the tower top and installed on the catwalk weighing cable, and the distance meets the hoisting space requirement; catwalk laying is completed; disassembling a surface net and a distribution beam of the catwalk from the main tower to the displacement frame; a hoisting space is reserved; the main cable saddle is lifted to the tower and lowered for installation; and finally, main cable saddle and catwalk installation is completed. The invention aims to solve the problem that subsequent construction procedures cannot be normally carried out due to the fact that existing cable saddles are lagged in production and cannot be supplied in time.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction hoisting and transportation, and in particular to a construction method for installing a cable saddle after a catwalk is erected in advance. Background Art

[0002] In the process of building long-span bridges across canyons, rivers, seas, etc., due to the extremely large span, based on cost economic considerations, ground-anchored suspension bridge structures are generally used. The saddle is an important load-bearing component of the suspension bridge. Usually, the main tower saddle is installed using a gantry lifting system. The conventional construction process is based on the convenience and safety of construction. Usually, the main tower saddle is lifted and installed first, and then the catwalk construction is carried out in sequence.

[0003] At present, the cable saddle mainly adopts the structural design of full casting or cast-welding combination. The cast-welding combination means that the saddle head used for limiting and directly bearing the main cable is formed by casting process, and the saddle head and the saddle body are combined by welding process. Cast steel parts have the characteristics of uneven structure, coarse internal grains and loose structure, which leads to low mechanical properties. As the span of the suspension bridge increases, the weight of the saddle body becomes heavier. In the 2000-meter suspension bridge, the weight of the main cable saddle is basically at the level of 200 tons, which is a huge challenge for the transportation and installation of the cable saddle, especially in mountainous areas. Therefore, in the construction of long-span suspension bridges, a new type of forging and welding combined cable saddle structure is adopted to reduce the weight of the cable saddle and improve the strength of the cable saddle. At the same time, the forging and welding method can be used to divide the main cable saddle into multiple parts for segmented lifting. The segmented cable saddle reduces the size of the cable saddle, which makes it easier to lift the cable saddle to the main tower.

[0004] However, the adoption of this new structure changed the cable saddle design, and the newly designed cable saddle structure needed to be experimentally verified for structural strength, resulting in delayed cable saddle production and inability to deliver them in a timely manner. Secondly, existing bridges require customized production due to different structures, and most cable saddles are manufactured using casting processes. However, since traditional casting processes rely heavily on highly polluting energy sources such as coal and coke, the combustion of these energy sources will produce a large amount of pollutants, as well as a large amount of dust and exhaust gas. In recent years, environmental protection requirements for the foundry industry have been increased, and a large number of small foundries have been closed due to their inability to meet environmental protection requirements. Therefore, cast cable saddles are mainly commissioned to a limited number of large foundries for production, resulting in a large accumulation of orders from large foundries. Even cable saddles produced by casting generally have problems with delayed construction.

[0005] If the construction is carried out according to the conventional suspension bridge construction process, the catwalk construction process will not be able to proceed as planned; since the catwalk is a necessary construction channel for the bridge superstructure construction, the overall construction period of the bridge will be delayed by several months, with losses of tens of millions of yuan. Summary of the invention

[0006] In view of the deficiencies in the prior art, the technical problem solved by the present invention is to provide a construction method for installing the cable saddle after erecting the catwalk in advance, so as to solve the problem that the existing cable saddles are delayed in production and cannot be supplied in time, resulting in the inability to carry out subsequent catwalk, main cable and other construction processes normally, causing the overall construction period of the bridge to be delayed.

[0007] In order to solve the above problems, the technical solution adopted by the present invention is: a construction method for installing a cable saddle after erecting the catwalk in advance, wherein the main cable saddle adopts a segmented design structure, and each segment is connected to form a cable saddle as a whole by high-strength bolts; Catwalk erection and cable saddle installation include the following steps: S100: Use the gantry hoisting system on the main tower to hoist the cable saddle grille, reaction frame and support plate to the top of the tower, completing the installation of the cable saddle grille, reaction frame and support plate; S200: Arrange the cable saddles of the catwalk load-bearing cables symmetrically on both sides of the cable saddle grid, and the distance between the two cable saddles meets the horizontal hoisting space requirements of the main cable saddle, completing the installation of the catwalk load-bearing cables; S300: Hoist the displacement frame to the top of the tower and install it on the catwalk weighing cable. The distance between the displacement frame and the main tower meets the longitudinal hoisting space requirements of the main cable saddle. S400: The catwalk surface structure is laid on the rear end of the side of the displacement frame away from the main tower, and the handrail cable, door frame and door frame load-bearing cable are installed to complete the overall laying of the catwalk; S500: The main saddle is hoisted to the top of the tower in sections. After adjusting the position, high-strength bolts are used to connect the saddle sections into a whole saddle.

[0008] The beneficial effects of this program are: The traditional method is to install the saddle first and then the catwalk. The saddle is lifted from the middle span side to the top of the tower through the gantry hoisting system on the top of the tower. The catwalk is also set up on the top of the tower and covers the ascending channel of the saddle. The construction of the catwalk will hinder the lifting of the saddle, resulting in the inability to set up the catwalk when the saddle cannot be delivered in time. During the construction of a large-span bridge, the catwalk erection period is 2-3 months, and the failure to build the catwalk in time will cause a serious delay in the construction period. By optimizing the catwalk structure and adjusting the distance between the catwalk displacement frame and the main tower on the middle span side of the main tower, the distance between the displacement frame and the main tower meets the longitudinal space requirements for the saddle hoisting, and the upper and lower "channels" for the saddle hoisting construction are reserved; the catwalk load-bearing wire rope passes through the displacement frame to concentrate the normally parallel wire ropes through the rotating saddles on both sides of the main tower saddle to meet the lateral space requirements for the saddle hoisting.

[0009] Since the saddle grille, reaction frame and support plate are mainly made of welded steel structure, the required construction period is short, so they can be hoisted and installed before the catwalk construction; since the main saddle is hoisted in sections, only the size of the saddle component with the largest size needs to be considered when arranging the displacement frame; the required hoisting space is small, and after the space is reduced, the distance that construction workers need to travel back and forth is reduced, which improves the safety of construction workers during construction.

[0010] The required hoisting passage space is determined according to the size of the saddle, and the position relationship between the catwalk displacement frame and the main tower is adjusted. The hoisting passage position of the saddle is considered in advance to ensure that the saddle can pass between the catwalk load-bearing ropes, solving the problem that the conventional catwalk load-bearing rope arrangement does not meet the saddle hoisting requirements. The saddle can be hoisted from the space between the catwalk load-bearing ropes, so that the saddle construction can be carried out after the catwalk construction is completed. This avoids the entire catwalk construction being affected by the production period of the main saddle, resulting in a delay in the construction period; the saddle can be hoisted after the catwalk construction. The mutual influence between the catwalk construction and the saddle construction is effectively solved, ensuring that the entire bridge construction can be carried out on schedule.

[0011] Furthermore, the main cable saddle is composed of a three-section structure consisting of a front section, a middle section and a rear section.

[0012] (1) The main saddle is composed of three sections. After being lifted onto the main tower, they are connected to form a whole by high-strength bolts. This allows the saddle to be transported in sections from the factory to the construction site based on components, thereby reducing transportation costs. It is especially suitable for transportation in mountainous areas. Mountainous areas are affected by the terrain, with large bends and unstable foundations. Large transportation equipment is difficult to use and has high operating costs. After segmentation, small transportation equipment suitable for mountainous areas can be used to reduce transportation difficulties.

[0013] (2) The forces exerted by the main cable on the front, middle and rear sections of the saddle groove are different. The forging mainly bears the downward pressure, while the front and rear sections bear the horizontal force while bearing the downward pressure. The combined surface forms an inverted trapezoidal wedge. Based on the opposite horizontal forces on the front and rear sections and the downward pressure on the middle section, the three-section force is more conducive to the tight fit of the main saddle as a whole, and is conducive to distributing the main cable pressure to the saddle base. Secondly, if the saddle adopts a two-section design, the front and rear sections of the main saddle will inevitably be disconnected from the middle, and the middle part of the saddle groove is the main load-bearing and force-decomposition part. In addition, the bottom of the saddle groove is made of forged steel, which has high strength. If there is an error in the combined surface in the middle to form a stepped surface, it will cause the steel wire to be stressed, which will have an adverse effect on the main cable wire.

[0014] Further, the specific steps of lifting the main cable saddle in sections in step S500 are as follows: S501: First, lift the rear section of the main saddle to the rear of the carrier plate to reserve installation space for the middle section and the front section; S502: Then the middle section is lifted so that the joint surface of the middle section contacts the rear section, and a lifting frame is placed under the middle section to support the bottom of the middle section at a higher position than the bottom of the rear section; S503: finally, the front section is lifted so that the joint surface of the front section and the middle section are in contact, and then the front section is lowered onto the support plate; S504: Use lifting equipment to suspend the middle section to bear the load, remove the lifting frame under the middle section and lower the middle section to the bearing plate, adjust the positions of the front section, middle section and rear section, and use high-strength bolts to connect the front section, middle section and rear section.

[0015] (1) One of the main differences between the installation method disclosed in this scheme and the traditional cable saddle installation method is that the main cable saddle is lifted in sections. That is, in the traditional installation method, the fully cast or integrated cast-welded cable saddle needs to be lifted directly to the top of the main tower in one step. Due to its large mass, the lifting difficulty is also very large. The segmented lifting of this scheme reduces the mass of each lift, which reduces the lifting difficulty. Especially when building bridges between mountains, it is extremely difficult to transport construction equipment, especially large equipment. If the main cable saddle is to be lifted to the main tower as a whole at one time, a large hoisting machine and other lifting equipment must be installed on the top of the main tower. The transportation and installation of the lifting equipment will incur a large cost and installation period. However, the mass of each lift in this scheme is less, so a smaller hoisting machine can be used, which will help reduce the investment cost of hoisting equipment and shorten the installation period.

[0016] (2) After the main cable saddle is lifted to the top of the main tower, it is necessary to use several high-strength bolts to connect them. High-strength bolts are usually tightened one by one, so it is difficult to make the joint surfaces of each segment fit tightly by tightening the bolts; therefore, it is necessary to make the joint surfaces fit tightly before tightening the bolts. However, the two joint surfaces form an inverted trapezoidal wedge, and after the cable saddle sections are lifted to the top of the main tower, in order to facilitate lateral movement, the cable saddle sections have a certain height from the ground from the supporting plate. In addition, it is difficult to control the lateral and vertical movements simultaneously during the movement. This makes it necessary to lower the cable saddle sections in the order of lifting the rear section, the middle section, and the front section, which will result in a large gap between the joint surfaces, especially between the joint surfaces of the middle section and the front section. This results in multiple pushes before bolt connection to make the joint surfaces fit tightly. In the present scheme, the middle section is first supported at a higher position, and after the front and rear sections are lowered, the middle end is lowered. Moreover, before the middle section is positioned by the jacking frame, the joint surfaces of the middle section and the rear section are in contact, and before the front section is lowered, the joint surfaces of the front and middle sections are in contact. Therefore, the width of the wedge formed by the joint surfaces of the rear and front sections after they are laid on the ground is slightly smaller than the width of the middle section. After the middle section is lowered, the front and rear sections slide slightly, and the gravity of the middle section opens the wedge, so that the joint surfaces fit tightly.

[0017] Furthermore, the lifting height of the middle section is controlled at 10-30 cm. If the lifting height of the middle section is too high, it will be inconvenient to position the middle section; secondly, as the lifting height increases, the installation height of the lifting equipment should also increase accordingly, which will increase the installation cost of the lifting equipment.

[0018] Furthermore, the displacement frame is arranged close to the tower top, and the displacement frame is only connected to several catwalk load-bearing cables in the middle, and is in contact with the catwalk load-bearing cables at the edge, and a T-shaped slide groove is provided at the position where the displacement frame contacts the catwalk load-bearing cables at the edge; the catwalk surface layer close to the displacement frame is detachably connected to the catwalk weighing cables in the middle, and the catwalk surface layer is connected to the catwalk load-bearing cables at the edge through several guide rail blocks, and the upper part of the guide rail block is detachably fixed to the catwalk surface layer and the edge catwalk load-bearing cables, and the lower end of the guide rail block is provided with a T-shaped slider that can be embedded in the T-shaped slide groove, and several T-shaped sliders are combined into a T-shaped slide rail; the displacement frame can be driven and moved to the bottom of the catwalk surface layer by the hoisting equipment, and the displacement frame makes the T-shaped slider embedded in the T-shaped slide groove when it moves to the bottom of the catwalk surface layer.

[0019] The catwalk load-bearing ropes that are normally arranged in parallel are concentrated through the rotating saddles on both sides of the main tower saddle through the displacement frame to meet the lateral space requirements for the saddle hoisting; the displacement frame is moved to leave sufficient space for the subsequent saddle hoisting, and the saddle can be hoisted from the space between the catwalk load-bearing ropes, so that the saddle construction can also be carried out after the catwalk construction is completed. This avoids the entire catwalk construction being affected by the production period of the main saddle, resulting in a delay in the construction period; the saddle can be hoisted after the catwalk construction. The mutual influence between the catwalk construction and the saddle construction is effectively solved, ensuring that the entire bridge construction can be carried out on schedule.

[0020] When dismantling the catwalk board, only the connection with the catwalk load-bearing cable in the middle that needs to be displaced is removed, but the connection with the two catwalk load-bearing cables at the edge is maintained, thereby improving the safety of the catwalk board during dismantling; when moving, the displacement frame is only separated from the two catwalk load-bearing cables at the edge, and the displacement frame can slide to the bottom of the catwalk board through the cooperation of the T-shaped slide groove and the T-shaped slide rail, so that the connection between the catwalk board and the catwalk load-bearing cables at the edge does not interfere with the movement of the displacement frame, and the lifting space of the main cable saddle is made available through the movement of the displacement frame without dismantling the original catwalk; thereby effectively saving the time, materials and labor costs wasted in manually dismantling the catwalk panel and restoring the catwalk panel. In addition, when dismantling the catwalk manually, all the catwalk panels close to the top of the tower need to be dismantled, and after dismantling, only the narrow catwalk load-bearing cables can be walked, which poses a safety hazard. However, this solution only requires separating the catwalk board from the middle load-bearing cable to leave sliding space for the displacement frame, and the displacement frame only needs to be separated from the catwalk load-bearing cables at the edge, but is still connected to the catwalk load-bearing cables in the middle. At the same time, since the displacement frame is connected to the lifting equipment, it is equivalent to the lifting equipment limiting the position of the displacement frame, so that the displacement frame remains relatively fixed with the catwalk load-bearing cables when the lifting equipment is not pulled, so that when the workers dismantle the relevant connection points and return to the top of the tower, they can still walk through the displacement frame, and safety is guaranteed; at the same time, when driving the displacement frame to move, the operator can control the lifting equipment at a safe position on the top of the tower to drive the displacement frame to slide, and the operation process is safer.

[0021] Furthermore, the T-shaped sliders are connected with limiting ropes, and the deformation distance between the T-shaped sliders is limited by the limiting ropes between the two T-shaped sliders, so that the positions of the T-shaped sliders will not be greatly offset during the movement of the displacement frame, so that the T-shaped sliders can be smoothly inserted into the T-shaped slots. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a flow chart of the method of first catwalk and then saddle according to embodiment 1 of the present invention; Figure 2 This is a schematic diagram of a flow chart of the catwalk-first-saddle-later method according to Embodiment 2 of the present invention; Figure 3 Install a process flow chart for the catwalk; Figure 4 It is a schematic diagram of the displacement frame, catwalk surface layer installation and catwalk load-bearing cables of the present invention; Figure 5 This is a top view of the displacement frame and catwalk surface; Figure 6 It is a side sectional view of the displacement frame sliding under the catwalk surface layer; Figure 7 for Figure 4 Enlarged view of part A in the middle; Figure 8 It is a schematic diagram of the door frame structure; Fig. 9 A top view of the quadrilateral hoisting space for the main saddle to be left when the displacement frame is fully moved to the bottom of the catwalk; Fig.10 Schematic diagram of the connection between the catwalk board and multiple catwalk ropes in the middle. DETAILED DESCRIPTION

[0023] The following is further described in detail through specific implementation methods: The figure marks in the drawings of the specification include: catwalk load-bearing cable 1, catwalk handrail cable 11, guide system 12, displacement frame 13, T-slot 131, U-shaped lock 132, catwalk board 14, guide block 15, T-block 151, limiting rope 152, door frame 21, traction system 22, sliding platform 23, slide rail 24, mounting plate 231.

[0024] Example 1 This is as attached Figure 1 As shown: The gantry 21 adopts a lattice structure, with a saddle introduction port reserved on the front side of the gantry 21, slide rails arranged in parallel on the tops of both sides of the gantry 21, and a lifting device provided on the gantry 21, which is a winch; a sliding platform is installed on the slide rails, the sliding platform is slidably connected to the slide rails, and the winch is installed on the sliding platform, and the sliding platform controls the lateral movement distance by an electric hoist or a hand hoist.

[0025] Construction and installation of the gantry; after the concrete on the top of the tower reaches the designed strength, use the tower crane on the top of the tower to hoist the main saddle gantry in sections; first install the four corner columns, and then install the struts between the columns after the columns are installed, and then install the top horizontal load-bearing longitudinal beams, and finally install the cross beams and cantilever section diagonal struts; install the sliding platform and winch at the upper end of the gantry.

[0026] The main cable saddle adopts a segmented design structure, and each segment is connected to form a cable saddle as a whole by high-strength bolts; the catwalk erection and cable saddle installation include the following steps: S100: Use the hoisting equipment of the installed gantry hoisting system to hoist the cable saddle grid and reaction frame to the top of the tower, complete the installation of the cable saddle grid and reaction frame, pour concrete, hoist the bearing plate and complete the installation of the bearing plate; S200: Catwalk load-bearing cable installation; the catwalk adopts a three-span continuous system, where the catwalk surface of the two side spans is 1.5-2.0m away from the main cable axis, and the catwalk surface of the middle span is 1.3-1.8m away from the main cable axis; S210: After the guide rope is installed, the traction system is installed; S220: Use the traction system to set up the bracket weighing cable between the two main towers and complete the bracket installation. S230: The saddles of the catwalk load-bearing cables are symmetrically arranged on both sides of the saddle grid, and the distance between the two saddles meets the horizontal hoisting space requirements of the main saddle and the carrier plate. Then, the catwalk load-bearing cables are hoisted into the saddles with the help of hoisting equipment to complete the installation of the catwalk load-bearing cables. S300: Lift the displacement frame to the top of the tower, and use the hand chain hoist and winch to symmetrically adjust the catwalk load-bearing cables to the corresponding positions, so that the distance between the catwalk weighing cables meets the lateral spacing requirements for the main cable saddle hoisting. Then install the displacement frame on the catwalk load-bearing cables, and the distance between the displacement frame and the main tower meets the longitudinal hoisting space requirements for the main cable saddle and the carrier plate. S400: After the catwalk cables are adjusted, the catwalk surface layer is laid, the transverse channels are installed, and the catwalk railings, side nets and catwalk rollers are installed.

[0027] S500: Remove the surface layer of the catwalk from the main tower to the displacement frame; reserve space for the main cable saddle hoisting; use the hoisting equipment on the gantry to lift the main cable saddle in sections; lift the main cable saddle to the set height and then move it horizontally above the installation position, and finally lower it for installation; The main cable saddle body is divided into a front section, a middle section and a rear section in sequence, and the front section, the middle section and the rear section all include a saddle head and a saddle body base. The steps of lifting the main cable saddle in sections are as follows; S501: First, lift the rear section of the main saddle to the rear of the carrier plate to reserve installation space for the middle section and the front section; S502: Then the middle section is lifted so that the joint surface of the middle section and the rear section are in contact, and a lifting frame is placed under the middle section to support the bottom of the middle section at a higher position than the bottom of the rear section; the lifting is stopped after the bottom of the middle section saddle is 20 cm higher than the tower top; S503: finally, the front section is lifted so that the joint surface of the front section and the middle section are in contact, and then the front section is lowered onto the support plate; S504: Use the hoisting equipment to suspend the middle section to bear the load, remove the lifting frame under the middle section and lower the middle section to the bearing plate, adjust the positions of the front section, middle section and rear section, and connect the front section, middle section and rear section with high-strength bolts; S505: Push the main cable saddle until it contacts the reaction frame.

[0028] S600: Re-pave the surface net and distribution beams of the catwalk from the main tower to the displacement frame.

[0029] By optimizing the catwalk structure and adjusting the distance between the catwalk displacement device and the main tower on the mid-span side of the main tower, the upper and lower "channels" for the cable saddle hoisting construction are reserved. The catwalk load-bearing wire ropes pass the normally parallel wire ropes through the displacement frame through the two sides of the main tower cable saddle. According to the size of the cable saddle and grille and other accessories, the required hoisting passage space is determined, and the position relationship between the catwalk displacement frame and the main tower is adjusted. The hoisting passage position of the cable saddle is considered in advance to ensure that the cable saddle can pass between the catwalk load-bearing ropes, solving the problem that the conventional catwalk load-bearing rope arrangement does not meet the cable saddle hoisting. The cable saddle can be hoisted from the middle of the catwalk load-bearing rope, so that the cable saddle can be constructed after the catwalk is completed. This avoids the entire catwalk construction being affected by the production period of the main cable saddle, resulting in a delay in the construction period; it is possible to hoist the cable saddle after the catwalk is constructed. The mutual influence between the catwalk construction and the cable saddle construction is effectively solved, ensuring that the entire bridge construction can be carried out on schedule.

[0030] The main cable saddle is hoisted by the tower top gantry hoisting system. A trial hoist is carried out before the formal hoisting. The maximum weight of the trial hoist is 1.05 times the weight of the cable saddle. The graded loading is set to 50%, 75%, and 1.05%. During the formal hoisting, the saddle body is raised by 20cm, left to stand for 5 minutes, then moved up and down 5cm, and then left to stand for 5 minutes to check whether the center of gravity is balanced and whether the mechanical equipment is operating normally. After observing that there is no abnormality, continue to lift the saddle body slowly, evenly, and steadily. The data generated by the trial hoisting can be used to analyze the effectiveness of the construction plan and make adjustments in time; reduce risks before formal construction. The use of graded loading allows operators to gradually check the response of each loading stage to ensure that each stage meets expectations; monitoring the stress and deformation of the structure during the loading process can ensure that all structures and devices are within a safe working range.

[0031] like Figure 2 As shown, the steps of catwalk erection and saddle installation in Example 2 are the same as those in Example 1 and will not be repeated here. The difference is that; S300: Lift the displacement frame to the top of the tower, and use the hand chain hoist and winch to symmetrically adjust the catwalk load-bearing cables to the corresponding positions, so that the distance between the catwalk weighing cables meets the lateral spacing requirements of the main cable saddle hoisting. Then, the displacement frame is detachably fixed to the catwalk load-bearing cables through the U-shaped lock, and the displacement frame is installed close to the main tower; S500: Connect the displacement frame to the lifting equipment, loosen the U-shaped lock to make the displacement frame and the catwalk load-bearing cable slidingly connected, and release the connection between the catwalk surface layer near the displacement frame and the load-bearing cable; and use the catwalk traction system as a guide system, and the lifting equipment drives the displacement frame to slide under the catwalk surface layer; reserve a saddle lifting space, and the lifting space meets the saddle lifting size requirements; release the connection between the lifting equipment and the displacement frame, and then use the lifting equipment on the gantry to lift the main saddle body in sections; lift the main saddle to the set height and then move it horizontally above the installation position, and finally lower it for installation; the section lifting steps are consistent with Example 1.

[0032] S600: Then connect the hoisting equipment to the displacement frame again, and the hoisting equipment drives the displacement frame to slide and reset; then fix the displacement frame to the catwalk load-bearing cable, and release the connection between the hoisting equipment and the displacement frame.

[0033] The catwalk load-bearing cables generally pass through the rotating cable saddle at the top of the tower and are then adjusted to be evenly distributed in the horizontal direction through the displacement frame. The rotating cable saddle is set on both sides of the main cable saddle. There are usually 6-10 catwalk load-bearing cables. The two catwalk weighing cables at the edge do not need to be displaced. The main purpose is to evenly separate the multiple catwalk load-bearing cables in the middle through the displacement frame so that the force is evenly distributed. This embodiment uses 8 catwalk load-bearing cables to illustrate the displacement frame structure.

[0034] like Figure 4-7 As shown, the displacement frame 13 is arranged close to the tower top, and a panel for construction workers to walk on is welded in the middle of the displacement frame 13. The displacement frame 13 is only detachably fixedly connected to the 6 catwalk load-bearing cables 1 in the middle through a U-shaped lock 132, and a T-shaped slide groove is provided at the position where the displacement frame 13 contacts the 2 catwalk load-bearing cables 1 at the edge; the catwalk board 14 and the 6 catwalk weighing cables in the middle are detachably fixed through a UU-shaped lock 132, and the catwalk board 14 is connected to the 2 catwalk load-bearing cables 1 at the edge through a plurality of guide rail blocks, and the upper part of the guide rail block is connected to the catwalk board 14 and the edge The catwalk load-bearing rope 1 is fixed with bolts, and a T-shaped slider that can be embedded in the T-shaped slide groove is fixed at the lower end of the guide rail block. Several T-shaped sliders are combined into a T-shaped slide rail, and the T-shaped sliders are connected with limiting ropes 152 for limiting. The T-shaped slide groove is larger than the T-shaped slider, so that the T-shaped slider can still be embedded in the T-shaped slide groove when there is a slight deviation. The displacement frame 13 can be moved to the bottom of the catwalk board 14 under the drive of the lifting equipment, and the two catwalk load-bearing ropes on the edge are located above the displacement frame 13 and do not contact the displacement frame 13, so that the T-shaped slider is embedded in the T-shaped slide groove.

[0035] The column at the upper end of the displacement frame 13 is slidably connected to the catwalk handrail cable 11. Due to the connection between the column at the upper end of the displacement frame 13 and the catwalk handrail cable 11, the displacement frame plays a guiding role during its movement.

[0036] During normal catwalk construction, the displacement frame is fixed to the middle catwalk weighing cable, and the catwalk panel is also detachably fixed to all catwalk load-bearing cables. By placing the displacement frame close to the tower top, the displacement frame can be used as a catwalk panel; when it needs to be moved, the displacement frame is connected to the lifting equipment, and the original catwalk traction system of the catwalk construction is used as the guide system 12 to fix the guide rail on the catwalk gantry; Fig.10 As shown, the catwalk panel 14 is disassembled and separated from the six catwalk load-bearing cables 1 in the middle, but the two catwalk load-bearing cables 1 at the edge are still fixed; then the U-shaped lock connecting the six catwalk load-bearing cables 1 in the middle and the displacement frame 13 is loosened but still kept connected, leaving a gap for the catwalk load-bearing cables and the displacement frame to slide, so that the displacement frame 13 can slide relative to the catwalk load-bearing cables 1 in the middle, and the guide system 12 is pulled by the hoisting equipment to pull the displacement frame 13 to move below the catwalk panel 14, so that during the movement of the displacement frame 13, the multiple catwalk load-bearing cables 1 in the middle of the displacement frame 13 close to the tower top are guided from being evenly spaced along the catwalk to being located on both sides of the displacement frame 13, thereby leaving lateral space for the main cable saddle hoisting; when the displacement frame 1 moves to the lower end of the catwalk panel, the T-shaped slide rail is embedded in the T-shaped slide groove 131. At this time, since the displacement frame 13 is not connected to the two catwalk load-bearing ropes 1 at the edge, But it is connected to the 6 catwalk load-bearing ropes in the middle, and the catwalk board 14 is connected to the two catwalk load-bearing ropes at the edge, but not connected to the 6 catwalk load-bearing ropes in the middle. The cooperation between the T-shaped slide groove and the T-shaped slide rail 151 allows the displacement frame to slide under the catwalk board. When the displacement frame moves under the catwalk board, it means that the T-shaped slider 151 is embedded in the T-shaped slide groove of the displacement frame. Since the catwalk load-bearing ropes at the edge are connected to the guide rail block, and the T-shaped slider is located at the lower end of the guide rail block, when the displacement frame 13 moves under the catwalk board 14, the two catwalk load-bearing ropes at the edge are located above the displacement frame 13 and do not contact the displacement frame 13; so that the connection between the catwalk board 14 and the catwalk load-bearing ropes at the edge does not interfere with the movement of the displacement frame 13, because the displacement frame 13 is located below the catwalk board 14 and connected to the 6 catwalk load-bearing ropes in the middle, the 6 catwalk load-bearing ropes in the middle are slightly lower than the two catwalk load-bearing ropes at the edge.

[0037] like Fig. 9 As shown, when the displacement frame is completely moved to the bottom of the catwalk board, the longitudinal distance between the displacement frame 13 and the tower top meets the longitudinal space requirement for the main cable saddle hoisting; thus, the hoisting equipment at the tower top can hoist the main cable saddle from the tower top, the catwalk load-bearing cable 1, and the displacement frame 1 to the tower top. After the main cable saddle is hoisted, the displacement frame 13 is reset to complete the subsequent main cable and other construction.

[0038] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A construction method for installing a saddle after erecting a catwalk in advance, characterized in that: The main cable saddle adopts a segmented design structure, and each segment is connected to form a cable saddle as a whole by high-strength bolts; Catwalk erection and cable saddle installation include the following steps: S100: Use the hoisting equipment of the gantry hoisting system on the main tower to hoist the saddle grille, reaction frame and support plate to the top of the tower to complete the installation of the saddle grille, reaction frame and support plate; S200: Arrange the cable saddles of the catwalk load-bearing cables symmetrically on both sides of the cable saddle grid, and the distance between the two cable saddles meets the horizontal hoisting space requirements of the main cable saddle, completing the installation of the catwalk load-bearing cables; S300: Hoist the displacement frame to the top of the tower and install it on the catwalk weighing cable. The distance between the displacement frame and the main tower meets the longitudinal hoisting space requirements of the main cable saddle. S400: The catwalk surface layer is laid on the rear end of the side of the displacement frame away from the main tower, and the handrail cable, door frame and door frame load-bearing cable are installed to complete the overall laying of the catwalk; S500: The main saddle is hoisted to the top of the tower in sections. After adjusting the position, high-strength bolts are used to connect the saddle sections into a whole saddle.

2. The construction method of installing the saddle after pre-erecting the catwalk according to claim 1, characterized in that: The main cable saddle is composed of a three-section structure consisting of a front section, a middle section and a rear section.

3. The construction method of installing the saddle after pre-erecting the catwalk according to claim 2, characterized in that: The specific steps of lifting the main cable saddle in sections in step S500 are as follows: S501: First, lift the rear section of the main saddle to the rear of the carrier plate to reserve installation space for the middle section and the front section; S502: Then the middle section is lifted so that the joint surface of the middle section contacts the rear section, and a lifting frame is placed under the middle section to support the bottom of the middle section at a higher position than the bottom of the rear section; S503: finally, the front section is lifted so that the joint surface of the front section and the middle section are in contact, and then the front section is lowered onto the support plate; S504: Use lifting equipment to suspend the middle section to bear the load, remove the lifting frame under the middle section and lower the middle section to the bearing plate, adjust the positions of the front section, middle section and rear section, and use high-strength bolts to connect the front section, middle section and rear section.

4. The construction method of installing the saddle after pre-erecting the catwalk according to claim 3 is characterized in that: The lifting height of the middle section is controlled at 10-30cm.

5. The construction method of installing the saddle after pre-erecting the catwalk according to claim 1 is characterized in that: After the main cable saddle is installed, the gantry hoisting system is connected to the displacement frame, and then the displacement frame is pulled close to the main tower and fixed to the catwalk load-bearing cable, so that the displacement frame covers the hoisting space for hoisting the main cable saddle.

6. The construction method of installing the saddle after pre-erecting the catwalk according to claim 5, characterized in that: The displacement frame is arranged close to the tower top, and the displacement frame is only connected to several catwalk load-bearing cables in the middle, and is in contact with the catwalk load-bearing cables at the edge, and a T-shaped slide groove is provided at the position where the displacement frame contacts the catwalk load-bearing cables at the edge; the catwalk surface layer close to the displacement frame is detachably connected to the catwalk weighing cables in the middle, and the catwalk surface layer is connected to the catwalk load-bearing cables at the edge through several guide rail blocks, and the upper part of the guide rail block is detachably fixed to the catwalk surface layer and the edge catwalk load-bearing cables, and the lower end of the guide rail block is provided with a T-shaped slider that can be embedded in the T-shaped slide groove, and several T-shaped sliders are combined into a T-shaped slide rail; the displacement frame can be driven and moved to the bottom of the catwalk surface layer by the hoisting equipment, and the displacement frame makes the T-shaped slider embedded in the T-shaped slide groove when it moves to the bottom of the catwalk surface layer.

7. The construction method of installing the saddle after pre-erecting the catwalk according to claim 6, characterized in that: The T-shaped sliding blocks are connected with limit ropes.

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