Space catwalk device erected by transverse large-deviation cable and using method

Abstract

The invention provides a space catwalk device erected by transverse large deviation cables and a using method, a catwalk portal comprises a portal main body, and a main cable transverse restraint frame which is vertically arranged is mounted in the portal main body; the vertical tops of the two portal frame bodies of the two catwalk portal frames are connected with the same upper transverse supporting truss through upper traction mechanisms correspondingly, and the vertical bottoms of the two portal frame bodies of the two catwalk portal frames are connected with the same lower transverse supporting truss through lower traction mechanisms correspondingly. The catwalk portal can be transversely pulled to move between the upper transverse supporting truss and the lower transverse supporting truss. According to the catwalk device, an existing spatial linear catwalk platform can be provided for construction before the main cable of the spatial cable-shaped suspension bridge is erected, that is, the main cable can be directly erected along the designed spatial line type, and influences such as torsion generated when the main cable is horizontally opened are avoided. In addition, when the catwalk multi-strand bearing cable is horizontally opened, asynchronous stretching can be released, the line shape of the bearing cable is more natural, and stress is even.

Description

Technical Field

[0001] The invention belongs to the technical field of bridges, and relates to a spatial cable-shaped suspension bridge, and in particular to a spatial catwalk device erected with transversely large-offset cables and a use method thereof. Background Art

[0002] Spatial cable suspension bridges are widely used in various super-large span bridges because of their unique force transmission mechanism, reasonable force, full use of material strength, and great spanning capacity. In the process of application, spatial main cable structures are becoming more and more important. Unlike traditional parallel cable suspension bridges, the main cables of the spatial cable surface are generally symmetrically inclined toward the center. In the completed bridge state, the main cables are not subjected to vertical force. The main cables are not only catenary-shaped in the vertical direction due to gravity, but also curve-shaped on the plane due to the inclined tension. The transversely spread main cables, slings, and stiffening beams form a stable triangle, which gives the main cables a restoring force similar to a pendulum, thereby improving the overall torsional stiffness.

[0003] The transverse position of the main cable of a space cable suspension bridge in the empty cable state and the completed bridge state is very different. The empty cable state after the main cable is erected only has vertical sag, and the main cable also has lateral deviation in the completed bridge state. Therefore, the transverse linear transformation of the main cable during the construction process is a key issue in the construction of space cable suspension bridges. In order to solve the problem of changing the main cable line shape during construction, there are two methods in existing projects: temporary cable method and temporary cross brace method. At present, both methods first erect the two main cable strands in a plumb state, then install the cable clamp, and then use external devices (cambered cables or cable cross braces) to open the empty cable to both sides, so that the empty cable line shape is close to the completed bridge line shape in the transverse direction, and then install the sling and other subsequent processes.

[0004] However, the above method of erecting empty cables on a plumb plane has certain defects, that is, when installing the cable clamp, the empty cable is in a plumb state, rather than the designed spatial curve state of the completed bridge; this state inconsistency becomes more serious as the lateral deviation of the spatial main cable increases, and the cable strands will produce obvious twisting, which may cause drum wires and tangled wires inside the main cable, causing safety hazards such as uneven stress distribution inside the main cable and reduced strength of the main cable. In addition, in the above method, when the main cable is opened, the catwalk and other devices will also rotate, which will cause the catwalk and other auxiliary devices to twist, and the stability of the working surface cannot be guaranteed. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a spatial catwalk device and a method for using a transversely large-offset cable erection device, so as to solve the technical problem of uneven stress distribution inside the main cable of the prior art spatial cable-shaped suspension bridge due to torsion during construction.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0007] A space catwalk device with transversely large-offset cables, comprising two groups of catwalk load-bearing cables and two groups of catwalk door cables, wherein the catwalk load-bearing cables are located above the catwalk door cables, and at least one transverse propping mechanism is transversely installed between the two groups of catwalk load-bearing cables and the two groups of catwalk door cables.

[0008] Each lateral propping mechanism comprises two catwalk door frames, one of the two catwalk door frames being installed between a group of catwalk load-bearing cables and a group of catwalk door frame cables on the same side, and the other of the two catwalk door frames being installed between another group of catwalk load-bearing cables and another group of catwalk door frame cables on the same side.

[0009] The catwalk door frame comprises a door frame body, in which a main cable transverse restraining frame arranged vertically is installed.

[0010] The vertical tops of the two gantry bodies of the two catwalk gantries are connected to the same upper cross-bracing truss through upper traction mechanisms, and the vertical bottoms of the two gantry bodies of the two catwalk gantries are connected to the same lower cross-bracing truss through lower traction mechanisms, so that the catwalk gantry can be pulled and moved laterally between the upper cross-bracing truss and the lower cross-bracing truss.

[0011] The present invention also has the following technical features:

[0012] An upper transverse adjustment structure is arranged between the top of the main cable transverse restraint frame and the portal frame body, and a lower transverse adjustment mechanism is arranged between the bottom of the main cable transverse restraint frame and the portal frame body. The upper transverse adjustment structure and the lower transverse adjustment mechanism have the same structure and are symmetrically arranged up and down.

[0013] The lower lateral adjustment mechanism includes two pairs of screw mounting seats installed on the portal frame body, a rotatable adjusting screw is installed between each pair of screw mounting seats, the two adjusting screws are arranged perpendicular to the lateral level and in parallel, the two adjusting screws are threadedly sleeved with the same movable base, one end of a pair of parallel ear seats is hinged in the same movable base, and the other end of the pair of ear seats is fixedly mounted on the end of the main cable lateral restraint frame.

[0014] A main cable guide pulley is installed vertically below the portal frame body, and a main cable traction pulley is installed vertically above the portal frame body. The main cable guide pulley and the main cable traction pulley are located on the same side of the main cable transverse restraint frame.

[0015] The upper traction mechanism and the lower traction mechanism have the same structure and are symmetrically arranged up and down.

[0016] The lower traction mechanism includes two pairs of gears, which are rotatably mounted on the bottom of the door frame body through gear shafts. The two pairs of gears are meshed on double-width racks, and the double-width racks are arranged on the top surface of the lower cross brace truss.

[0017] A group of gantry pulleys are installed on the gear shafts of one pair of the two pairs of gears. The gantry pulleys are driven by steel strands to drive the gears to move on the double-width racks, so that the catwalk gantry can be pulled and moved in the lateral direction relative to the lower cross brace truss.

[0018] The gear is a self-locking gear; at least one self-locking lock tongue is also provided at the bottom of the door frame body, and the self-locking lock tongue can cooperate with the self-locking gear to achieve one-way self-locking.

[0019] The gantry body and the catwalk load-bearing cable are linked via a guide clamping mechanism, and the gantry body and the catwalk gantry cable are also linked via a guide clamping mechanism. The guide clamping mechanism comprises a guide, and a clamping device is arranged in front of the guide.

[0020] The guide device comprises a guide wheel frame installed inside the portal frame body, and an asymmetric special-shaped transverse guide wheel and an asymmetric special-shaped vertical guide wheel are installed on the guide wheel frame.

[0021] The clamping device includes a clamping frame installed inside the door frame body, a fixed block is installed on the upper side of the clamping frame, and a movable block is installed on the lower side of the clamping frame; the movable block is fixedly connected to one end of the sliding shaft, the other end of the sliding shaft passes through a sliding groove opened on the side wall of the clamping frame, and the other end of the sliding shaft is vertically installed with a lifting and rotating screw through a threaded hole; one end of the lifting and rotating screw is vertically threadedly connected to the lifting and rotating seat, and the lifting and rotating seat can be rotatably vertically installed on the outer wall of the clamping frame on one side of the sliding groove, and the lifting and rotating screw can drive the movable block to move through the lifting and rotation of the lifting and rotating seat.

[0022] A brake shoe is also vertically fixed on the outer wall of the clamping frame on the other side of the sliding groove, and a locking groove is provided on the brake shoe which runs through the inside and outside of the brake shoe. The other end of the lifting and rotating screw passes through the locking groove and is equipped with a locking rotating handle. A brake pad is fixed on the lifting and rotating screw between the locking rotating handle and the brake shoe. The threaded rotation feed of the lifting and rotating screw relative to the lifting and rotating seat can realize friction locking between the brake pad and the brake shoe.

[0023] The upper cross brace truss and the lower cross brace truss have the same structure and are symmetrically arranged up and down; the outer sides of the upper cross brace truss and the lower cross brace truss are respectively provided with prestressed tension strings.

[0024] In the two groups of catwalk load-bearing cables, each group of catwalk load-bearing cables is divided into two small groups of catwalk load-bearing cables, and each group of catwalk load-bearing cables consists of three cables; in the two groups of catwalk gantry cables, each group of catwalk gantry cables is divided into two small groups of catwalk gantry cables, and each group of catwalk gantry cables consists of one cable.

[0025] The present invention also protects a method for using a space catwalk device for erecting cables with large lateral offsets. The method adjusts the position of catwalk door frames on different lateral opening mechanisms through an upper traction mechanism and a lower traction mechanism. Before erecting the main cable, the design space line shape of the main cable is determined in advance, and the main cable is directly erected along the design space line shape.

[0026] Compared with the prior art, the present invention has the following technical effects:

[0027] (I) The catwalk device of the present invention enables the existing space linear catwalk platform to be provided for the construction of the space cable suspension bridge before the main cable is installed, that is, the main cable can be installed directly along the designed space linear shape to avoid the influence of torsion when horizontally stretched. In addition, the asynchronous stretching of the multiple load-bearing cables of the catwalk when horizontally stretched can be released, and the load-bearing cable linear shape is more natural and the stress is uniform.

[0028] (II) The space catwalk device for erecting cables with large lateral offsets of the present invention is directly stretched out laterally after the catwalk load-bearing cables are erected. Therefore, there is no need to tension the load-bearing cables laterally from the outside using the traditional method. This makes it easy to use in special terrains and under the "cable first, beam later" method. It can avoid structural and stress losses caused by constrained torsion during space tensioning, and ensure that the direction of the cables is correct when the main cables are erected.

[0029] (III) The space catwalk device for erecting cables with large lateral offsets of the present invention is a hyperstatically indeterminate quadrilateral rectangular structure. Therefore, when the two sides are symmetrically constructed, the load weight is consistent, the upper and lower cross braces will remain horizontal, and the catwalk portal will also maintain its initial direction. Therefore, the working plane of the catwalk portal will be guaranteed to be horizontal, which is conducive to workers' construction and operation.

[0030] (IV) The space catwalk device for laying transversely large-offset cables of the present invention is to lay the main cable after the catwalk space is finalized. Therefore, the traditional method of space tensioning of the main cable is not required, and the structural and stress losses caused by the constrained torsion during space tensioning can be avoided. The correct direction and shape of the cable strands can be ensured when the main cable is laid.

[0031] (V) The space catwalk device for erecting cables with large transverse offsets of the present invention is subjected to the horizontal force component caused by the natural sagging of the main cables at both ends when in operation, which is an eccentric moment for the cross brace, and the upper and lower cross braces are externally tensile. In addition, when the cross brace is long, the moment generated by its own weight will also cause the lower part to be tensile. The present invention reserves space for installing external prestressed string in the cross brace, which can significantly improve the stress distribution of the cross brace when using external prestress. It can also be considered to increase the omnidirectional external prestress, which can greatly increase the structural rigidity.

[0032] (VI) The lateral large offset cable erection space catwalk device of the present invention adopts a newly designed asymmetric special-shaped guide wheel at the guide wheel frame. Since the contact force transmission of the load-bearing cable to the device is obliquely inward, the traditional guide wheel will fit the load-bearing cable and be separated from the air. The new guide wheel can fit perfectly, and the new guide wheel is also installed laterally. The model size can be redesigned for load-bearing cables of different diameters.

[0033] (VII) The space catwalk device for erecting cables with large lateral offsets of the present invention adopts a design in which the vertical main cable lateral restraint frame is hinged at the bottom and slides at the top, so that the main cable lateral restraint frame can freely expand and contract and deform when subjected to the horizontal force of the main cable, and only generates horizontal force but no bending moment on the outer door frame, thereby minimizing the deformation and internal stress of the device.

[0034] (VIII) The space catwalk device for erecting cables with large lateral offsets of the present invention adopts a newly designed clamp as a locking device. The clamp is designed one on each of the two sides. The friction force of the two halves of the clamp around the cable produces a locking effect. The newly designed clamp device uses a lifting handle to clamp and a rotating handle to lock and clamp. One person can complete the locking action on both sides.

[0035] (IX) The space catwalk device for erecting transversely large-displacement cables of the present invention has a large structure size and weight. After being built at the top of the main tower, it slides along the guide cable to a predetermined position and is locked before construction can begin. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the overall structure of a space catwalk device erected with large transverse offset cables.

[0037] Figure 2 This is a schematic diagram of the overall structure of the catwalk.

[0038] Figure 3 It is a schematic diagram of the overall structure of the lower lateral adjustment mechanism.

[0039] Figure 4 It is a schematic diagram of the overall structure of the traction mechanism.

[0040] Figure 5 A side view schematic diagram of the guide structure.

[0041] Figure 6 It is a structural schematic diagram of the locking part of the traction mechanism.

[0042] Figure 7 The figure is a schematic diagram of the overall structure of the clamp.

[0043] Figure 8 This is a schematic diagram of the usage status of the spatial catwalk device installed with large lateral offset cables.

[0044] The meanings of the numbers in the figure are: 1- catwalk load-bearing cable, 2- catwalk gantry cable, 3- catwalk, 4- catwalk gantry, 5- upper traction mechanism, 6- upper cross bracing truss, 7- lower traction mechanism, 8- lower cross bracing truss, 9- guide clamping mechanism, 10- guide, 11- clamping device, 12- prestressed tensioning string, 13- main cable, 14- road center line, 15- bridge tower, 16- main cable back cable.

[0045] 401-gantry body, 402-main cable transverse restraint frame, 403-upper transverse adjustment structure, 404-lower transverse adjustment mechanism, 405-main cable guide pulley, 406-main cable traction pulley.

[0046] 40401-screw mounting base, 40402-adjusting screw, 40403-moving base, 40404-ear base.

[0047] 701-gear, 702-gear shaft, 703-double-width rack, 704-gantry pulley, 705-steel strand, 706-self-locking lock tongue.

[0048] 1001-guide wheel frame, 1002-asymmetric special-shaped transverse guide wheel, 1003-asymmetric special-shaped vertical guide wheel.

[0049] 1101-clamping frame, 1102-fixed block, 1103-movable block, 1104-sliding shaft, 1105-sliding groove, 1106-threaded hole, 1107-lifting and rotating screw, 1108-lifting and rotating seat, 1109-brake shoe, 1110-locking groove, 1111-locking and rotating handle, 1112-brake pad.

[0050] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0051] It should be noted that, unless otherwise specified, all components in the present invention are components known in the prior art.

[0052] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0053] Embodiment 1:

[0054] This embodiment provides a space catwalk device with large horizontal offset cables. Figure 1 As shown, it includes two groups of catwalk load-bearing cables 1 and two groups of catwalk door cables 2. The catwalk load-bearing cables 1 are located above the catwalk door cables 2. At least one transverse propping mechanism 3 is transversely installed between the two groups of catwalk load-bearing cables 1 and the two groups of catwalk door cables 2.

[0055] like Figure 2 As shown, each lateral expansion mechanism 3 includes two catwalk gantries 4, one of the two catwalk gantries 4 is installed between a group of catwalk load-bearing cables 1 and a group of catwalk gantry cables 2 on the same side, and the other catwalk gantries 4 is installed between another group of catwalk load-bearing cables 1 and another group of catwalk gantry cables 2 on the same side.

[0056] like Figure 2 As shown, the catwalk gantry 4 includes a gantry body 401 , in which a vertically arranged main cable transverse restraint frame 402 is installed.

[0057] like Figure 2 As shown, the vertical tops of the two gantry bodies 401 of the two catwalk gantries 4 are connected to the same upper cross-bracing truss 6 via the upper traction mechanism 5, and the vertical bottoms of the two gantry bodies 401 of the two catwalk gantries 4 are connected to the same lower cross-bracing truss 8 via the lower traction mechanism 7, so that the catwalk gantry 4 can be pulled and moved laterally between the upper cross-bracing truss 6 and the lower cross-bracing truss 8.

[0058] As a specific solution of this embodiment, Figure 2 As shown, an upper transverse adjustment structure 403 is arranged between the top of the main cable transverse restraint frame 402 and the portal frame body 401, and a lower transverse adjustment mechanism 404 is arranged between the bottom of the main cable transverse restraint frame 402 and the portal frame body 401. The upper transverse adjustment structure 403 and the lower transverse adjustment mechanism 404 have the same structure and are symmetrically arranged up and down.

[0059] Further preferably, Figure 3 As shown, the lower lateral adjustment mechanism 404 includes two pairs of screw mounting seats 40401 installed on the gantry body 401, and a rotatable adjusting screw 40402 is installed between each pair of screw mounting seats 40401, and the two adjusting screws 40402 are arranged perpendicular to the lateral level and in parallel, and the two adjusting screws 40402 are threadedly sleeved with the same movable base 40403, and one end of a pair of parallel ear seats 40404 is hinged in the same movable base 40403, and the other end of the pair of ear seats 40404 is fixedly installed on the end of the main cable lateral restraint frame 402.

[0060] As a preferred solution of this embodiment, Figure 2 As shown, a main cable guide pulley 405 is installed vertically below the portal body 401, and a main cable traction pulley 406 is installed vertically above the portal body 401. The main cable guide pulley 405 and the main cable traction pulley 406 are located on the same side of the main cable transverse restraint frame 402.

[0061] As a specific solution of this embodiment, Figure 2 As shown, the upper traction mechanism 5 and the lower traction mechanism 7 have the same structure and are symmetrically arranged up and down.

[0062] Further preferably, Figure 4 As shown, the lower traction mechanism 7 includes two pairs of gears 701, and the two pairs of gears 701 are rotatably installed on the bottom of the door frame body 401 through gear shafts 702 respectively, and the two pairs of gears 701 are engaged with a double-width rack 703, and the double-width rack 703 is arranged on the top surface of the lower cross brace truss 8; in this embodiment, the double-width rack 703 greatly limits the longitudinal torsion of the entire device. Due to the existence of the upper and lower cross braces, the torsion of the catwalk is also constrained, and the lateral stability will be greatly enhanced.

[0063] like Figure 5 As shown, a group of gantry pulleys 704 are installed on the gear shaft 702 of one pair of gears 701 in the two pairs of gears 701, and the gantry pulleys 704 are driven by steel strands 705 to drive the gears 701 to move on the double-width racks 703, so that the catwalk gantry 4 can be pulled and moved in the lateral direction relative to the lower cross bracing truss 8. In this embodiment, the steel strands 705 can be driven by an external motor.

[0064] Further preferably, Figure 6 As shown, the gear 701 is a self-locking gear; at least one self-locking lock tongue 706 is also provided at the bottom of the door frame body 401, and the self-locking lock tongue 706 can cooperate with the self-locking gear to achieve one-way self-locking. In this embodiment, the self-locking lock tongue 706 and the self-locking gear both adopt the self-locking lock tongue and self-locking gear commonly known in the art. Due to the existence of the self-locking lock tongue 706, it can be automatically locked at every moment after the catwalk is horizontally connected and opened, without manual operation, that is, the catwalk spacing is automatically limited. Since the direction of opening is determined, only one direction needs to be automatically locked, and the movement in the other direction can only be manually operated in the disassembly step after everything is completed, and the upper and lower cross bracing trusses can be overlapped and lengthened on the periphery one by one as the device is opened.

[0065] As a specific solution of this embodiment, Figure 4As shown, the gantry body 401 and the catwalk load-bearing cable 1 are connected by a guide clamping mechanism 9, and the gantry body 401 and the catwalk gantry cable 4 are also connected by a guide clamping mechanism 9. The guide clamping mechanism includes a guide 10, and the guide 10 is provided with a clamp 11 in front of the cable axis.

[0066] Further preferably, Figure 5 As shown, the guide 10 includes a guide wheel frame 1001 installed inside the gantry body 401, and an asymmetric special-shaped transverse guide wheel 1002 and an asymmetric special-shaped vertical guide wheel 1003 are installed on the guide wheel frame 1001; in this embodiment, because the cable not only exerts an upward force on the device but also a horizontal force, two asymmetric special-shaped pulleys are arranged on it to fit the cable, and the guide wheels are replaceable to fit cables of different sizes.

[0067] Further preferably, Figure 7 As shown, the clamp 11 includes a clamp frame 1101 installed inside the door frame body 401, a fixed block 1102 is installed on the upper side of the clamp frame 1101, and a movable block 1103 is installed on the lower side of the clamp frame 1101; the movable block 1103 is fixedly connected to one end of the sliding shaft 1104, and the other end of the sliding shaft 1104 passes through a sliding groove 1105 opened on the side wall of the clamp frame 1101, and the other end of the sliding shaft 1104 is vertically installed with a lifting and rotating screw 1107 through a threaded hole 1106; one end of the lifting and rotating screw 1107 is vertically threadedly connected to a lifting and rotating seat 1108, and the lifting and rotating seat 1108 is rotatably vertically installed on the outer wall of the clamp frame 1101 on one side of the sliding groove 1105, and the lifting and rotating screw 1107 can drive the movable block 1103 to move through the lifting and rotation of the lifting and rotating seat 1108.

[0068] like Figure 7 As shown, a brake shoe 1109 is vertically fixed on the outer wall of the clamping frame 1101 on the other side of the sliding groove 1105, and a locking groove 1110 is opened on the brake shoe 1109 to pass through the inner and outer sides of the brake shoe 1109. The other end of the lifting and rotating screw 1107 passes through the locking groove 1110 and is equipped with a locking rotating handle 1111. A brake pad 1112 is fixed on the lifting and rotating screw 1107 between the locking rotating handle 1111 and the brake shoe 1109. The threaded rotation feed of the lifting and rotating screw 1107 relative to the lifting and rotating seat 1108 can realize the friction locking between the brake pad 1112 and the brake shoe 1109.

[0069] As a specific solution of this embodiment, Figure 2As shown, the upper cross brace truss 6 and the lower cross brace truss 8 have the same structure and are symmetrically arranged up and down; the outer sides of the upper cross brace truss 6 and the lower cross brace truss 8 are respectively provided with prestressed tension strings 12. The device of this embodiment uses a large number of standardized structures, and the length of the horizontal connection can be designed and constructed according to the conditions on site, using the construction-traction-construction method. The cross brace can be erected using a Bailey truss, on which a human crosswalk can be laid. Used as a horizontal passage.

[0070] As a preferred solution of this embodiment, Figure 2 As shown, among the two groups of catwalk load-bearing cables 1, each group of catwalk load-bearing cables 1 is divided into two small groups of catwalk load-bearing cables 1, and each small group of catwalk load-bearing cables 1 consists of three cables; among the two groups of catwalk gantry cables 2, each group of catwalk gantry cables 2 is divided into two small groups of catwalk gantry cables 2, and each small group of catwalk gantry cables 2 consists of one cable.

[0071] Embodiment 2:

[0072] This embodiment provides a method for using the spatial catwalk device installed with a large lateral offset cable in Embodiment 1. The method adjusts the position of the catwalk door frame 4 on different lateral opening mechanisms 3 through the upper traction mechanism 5 and the lower traction mechanism 7. Before installing the main cable 13, the design spatial linear shape of the main cable 13 is determined in advance, and the main cable 13 is installed directly along the designed spatial linear shape.

[0073] like Figure 8 As shown, the method specifically comprises the following steps:

[0074] Step 1: Design and assemble the cross brace trusses:

[0075] The spacing of the transverse spreading mechanism 3 is selected according to the arrangement of the spatial cable suspension bridge and the pre-designed position of the main cable 13. Generally, one group is arranged at the mid-span position and the 1 / 4 span position. The designed upper cross bracing truss 6 and lower cross bracing truss 8 are assembled, and then the double-width rack rail 703 is welded and installed thereon.

[0076] Step 2: Install the door frame and set up the catwalk cable:

[0077] The catwalk gantry 4, upper cross bracing truss 6, lower cross bracing truss 8, and clamp 11 are assembled on the top platform of the bridge tower 15 of the suspension bridge. The transverse opening mechanism 3 is set on the catwalk load-bearing cable 1 and the catwalk gantry cable 2. The transverse opening mechanism 3 slides along the cable to the mid-span. The sliding can be controlled by controlling the clamp 11 in the middle, so that there are three groups of transverse opening mechanisms 3 in the middle span and the 1 / 4 side spans on both sides. At this time, the cross bracing opening lengths of the three groups of transverse opening mechanisms 3 are the same, and the transverse opening mechanisms 3 are in a parallel state. According to the engineering example, the guide wheel frame 1001 is installed on the gantry body 401 to meet the spacing and number of the catwalk load-bearing cables 1. According to the size of the catwalk load-bearing cables 1, the appropriate asymmetric special-shaped transverse guide wheel 1002 and asymmetric special-shaped vertical guide wheel 1003 are selected.

[0078] Step 3: Install the traction mechanism:

[0079] An upper traction mechanism 5 and a lower traction mechanism 7 are installed between the catwalk door frame 4 and the cross bracing truss, and are driven by a steel strand 705. A self-locking lock tongue 706 is installed on the lower side of the catwalk door frame 4, and the self-locking lock tongue 706 and the gear 701 form a one-way self-locking structure, thereby ensuring that the relative opening distance between the catwalk door frames 4 is locked.

[0080] Step 4: Open the catwalk horizontally:

[0081] After obtaining the design data of the main cable 13, the clamp 10 of the catwalk load-bearing cable 1 on the inner side is kept locked, and the clamp 10 of the catwalk load-bearing cable 1 on the outer side is operated to release the lock: twist the locking rotating handle 1111, the friction between the brake pad 1112 and the brake shoe 1109 disappears, and the locking rotating handle 1111 is rotated to drive the movable block 1103 to move downward, so that the catwalk load-bearing cable 1 on the outer side can slide relative to the lateral expansion mechanism 3, which is used to offset the different length constraints of the inner and outer sides when the catwalk load-bearing cable 1 is bent horizontally.

[0082] The steel strand 705 is driven, so that the rotation of the gantry pulley 704 drives the gear shaft 702 to rotate, and then the gear 701 is fed on the double-width rack 703, driving the catwalk gantry 4 to open outward. The design of the guide 10 allows the catwalk load-bearing cable 1 to move outward by the asymmetric special-shaped vertical guide wheel 1003, while ensuring that the asymmetric special-shaped horizontal guide wheel 1002 and the catwalk load-bearing cable 1 are not loose, thereby ensuring the load-bearing capacity.

[0083] When the catwalk door frame 4 is driven by the upper traction mechanism 5 and the lower traction mechanism 7 to open each other, the self-locking lock tongue 706 can ensure self-locking every time a tooth mark is opened, thereby preventing the catwalk door frame 4 from sliding toward the middle under the influence of gravity.

[0084] Step 5: Install the prestressed chords:

[0085] When the catwalk door frame 4 is opened to the right position, due to the large slenderness ratio of the upper cross brace truss 6 and the lower cross brace truss 8, under the influence of deadweight and possible load, it is necessary to establish a prestressed tension string 12 to enhance the rigidity and bearing capacity in a low-cost and effective way. The specific installation method of the prestressed tension string 12 adopts the prestressed tension string 12 installation method known in the art.

[0086] Step 6: Construction of space main cable:

[0087] When the above steps 1 to 5 are ready, a traction machine slideway is set up on the main cable traction pulley 406 to pull a single main cable strand through the main cable guide pulley 405. After all the strands are pulled, they are tensioned and the main cable 13 is kept in a hexagonal cross section by conventional methods. The main cables 13 will also be pulled closer to each other by their own weight, driving the main cable transverse restraint frame 402 to produce transverse deflection. The adjustment screws 40402 on the upper and lower parts of the main cable transverse restraint frame 402 are rotated to drive the ear seat 40404 to move, and the pressure deformation caused by the main cable 13 on the main cable transverse restraint frame 402 is adjusted and compensated.

[0088] Step seven: dismantling of the device after construction is completed.

[0089] When the whole bridge is constructed, the main cable in space maintains geometric stability under the action of the inclined suspension rod, and the space catwalk device of the present invention with large lateral offset cable erection is ready to be dismantled. The prestressed tensioning string 12, the upper cross bracing truss 6 and the lower cross bracing truss 8 are dismantled in sequence, and the remaining device can be temporarily fixed on the main cable 13, and then the catwalk load-bearing cable 1 and the catwalk gantry cable 2, the guide 10 and the clamp 11 are dismantled, and finally the catwalk gantry 4 is dismantled with the assistance of a car crane or the like.

Claims

1. A space catwalk device with large lateral offset cables, characterized in that: The catwalk comprises two groups of catwalk load-bearing cables (1) and two groups of catwalk door cables (2), wherein the catwalk load-bearing cables (1) are located above the catwalk door cables (2), and at least one transverse opening mechanism (3) is transversely installed between the two groups of catwalk load-bearing cables (1) and the two groups of catwalk door cables (2); Each lateral spreading mechanism (3) comprises two catwalk door frames (4), one of the two catwalk door frames (4) being installed between a group of catwalk load-bearing cables (1) and a group of catwalk door frame cables (2) on the same side, and the other of the two catwalk door frames (4) being installed between another group of catwalk load-bearing cables (1) and another group of catwalk door frame cables (2) on the same side; The catwalk door frame (4) comprises a door frame body (401), and a main cable transverse restraining frame (402) arranged vertically is installed in the door frame body (401); The vertical tops of the two door frame bodies (401) of the two catwalk door frames (4) are connected to the same upper cross bracing truss (6) via an upper traction mechanism (5), and the vertical bottoms of the two door frame bodies (401) of the two catwalk door frames (4) are connected to the same lower cross bracing truss (8) via a lower traction mechanism (7), so that the catwalk door frames (4) can be pulled and moved laterally between the upper cross bracing truss (6) and the lower cross bracing truss (8).

2. The space catwalk device with transversely large-offset cables as claimed in claim 1, characterized in that: An upper transverse adjustment structure (403) is arranged between the top of the main cable transverse restraint frame (402) and the main frame body (401), and a lower transverse adjustment mechanism (404) is arranged between the bottom of the main cable transverse restraint frame (402) and the main frame body (401), and the upper transverse adjustment structure (403) and the lower transverse adjustment mechanism (404) have the same structure and are arranged symmetrically up and down; The lower lateral adjustment mechanism (404) includes two pairs of screw mounting seats (40401) installed on the portal frame body (401), and a rotatable adjustment screw (40402) is installed between each pair of screw mounting seats (40401). The two adjustment screws (40402) are arranged perpendicular to the lateral level and in parallel. The two adjustment screws (40402) are threadedly sleeved with the same movable base (40403), and one end of a pair of parallel ear seats (40404) is hinged in the same movable base (40403), and the other end of the pair of ear seats (40404) is fixedly installed on the end of the main cable lateral restraint frame (402).

3. The space catwalk device with large lateral deviation cables as claimed in claim 1, characterized in that: A main cable guide pulley (405) is installed vertically below the portal frame body (401), and a main cable traction pulley (406) is installed vertically above the portal frame body (401). The main cable guide pulley (405) and the main cable traction pulley (406) are located on the same side of the main cable transverse restraint frame (402).

4. The space catwalk device with transversely large-offset cables as claimed in claim 1, characterized in that: The upper traction mechanism (5) and the lower traction mechanism (7) have the same structure and are symmetrically arranged up and down; The lower traction mechanism (7) comprises two pairs of gears (701), the two pairs of gears (701) are rotatably mounted on the bottom of the portal frame body (401) via gear shafts (702), the two pairs of gears (701) are meshed on a double-width rack (703), and the double-width rack (703) is arranged on the top surface of the lower cross bracing truss (8); A group of gantry pulleys (704) are installed on the gear shaft (702) of one pair of gears (701) in the two pairs of gears (701). The gantry pulleys (704) are driven by steel strands (705) to drive the gears (701) to move on the double-width rack rails (703), so that the catwalk gantry (4) can be pulled and moved in the lateral direction relative to the lower cross brace truss (8).

5. The space catwalk device with transversely large-offset cables as claimed in claim 4, characterized in that: The gear (701) is a self-locking gear; at least one self-locking lock tongue (706) is also provided at the bottom of the door frame body (401), and the self-locking lock tongue (706) can cooperate with the self-locking gear to achieve one-way self-locking.

6. The space catwalk device with transversely large-offset cables as claimed in claim 1, characterized in that: The gantry body (401) and the catwalk load-bearing cable (1) are connected via a guide clamping mechanism (9), and the gantry body (401) and the catwalk gantry (4) cable are also connected via a guide clamping mechanism (9). The guide clamping mechanism includes a guide (10), and a clamping device (11) is arranged in front of the guide (10).

7. The space catwalk device with transversely large-offset cables as claimed in claim 6, characterized in that: The guide (10) comprises a guide wheel frame (1001) installed inside the portal frame body (401), and an asymmetric special-shaped transverse guide wheel (1002) and an asymmetric special-shaped vertical guide wheel (1003) are installed on the guide wheel frame (1001); The clamping device (11) comprises a clamping frame (1101) installed inside the door frame body (401), a fixed block (1102) is installed on the upper side of the clamping frame (1101), and a movable block (1103) is installed on the lower side of the clamping frame (1101); the movable block (1103) is fixedly connected to one end of a sliding shaft (1104), and the other end of the sliding shaft (1104) passes through a sliding groove (1105) provided on the side wall of the clamping frame (1101), and the sliding shaft (1104) is fixedly connected to the sliding groove (1105) provided on the side wall of the clamping frame (1101). 4) is vertically mounted on the lifting and rotating screw rod (1107) through a threaded hole (1106); one end of the lifting and rotating screw rod (1107) is vertically threadedly connected to the lifting and rotating seat (1108); the lifting and rotating seat (1108) is rotatably mounted vertically on the outer wall of the clamping frame (1101) on one side of the sliding groove (1105); the lifting and rotating screw rod (1107) can drive the movable block (1103) to move through the lifting and rotating of the lifting and rotating seat (1108); A brake shoe (1109) is also vertically fixed on the outer wall of the clamping frame (1101) on the other side of the sliding groove (1105), and a locking groove (1110) is opened on the brake shoe (1109) and passes through the inner and outer sides of the brake shoe (1109). The other end of the lifting and rotating screw (1107) passes through the locking groove (1110) and is installed with a locking rotation handle (1111). A brake pad (1112) is fixed on the lifting and rotating screw (1107) between the locking rotation handle (1111) and the brake shoe (1109). The threaded rotation feed of the lifting and rotating screw (1107) relative to the lifting and rotating seat (1108) can realize the friction locking between the brake pad (1112) and the brake shoe (1109).

8. The space catwalk device with large lateral offset cables as claimed in claim 1, characterized in that: The upper cross brace truss (6) and the lower cross brace truss (8) have the same structure and are symmetrically arranged up and down; the outer sides of the upper cross brace truss (6) and the lower cross brace truss (8) are respectively provided with prestressed tension strings (12).

9. The space catwalk device with transversely large-offset cables as claimed in claim 1, characterized in that: In the two groups of catwalk load-bearing cables (1), each group of catwalk load-bearing cables (1) is divided into two small groups of catwalk load-bearing cables (1), and each small group of catwalk load-bearing cables (1) is three cables; in the two groups of catwalk door frame cables (2), each group of catwalk door frame cables (2) is divided into two small groups of catwalk door frame cables (2), and each small group of catwalk door frame cables (2) is one cable.

10. A method for using the space catwalk device for erecting cables with large lateral deviations as claimed in claim 1, characterized in that: The method adjusts the position of the catwalk door frame (4) on different transverse opening mechanisms (3) by means of an upper traction mechanism (5) and a lower traction mechanism (7); before the main cable (13) is installed, the design space line shape of the main cable (13) is determined in advance, and the main cable (13) is directly installed along the design space line shape.

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