Construction method of upper tower column of variable cross-section special-shaped cable tower

Abstract

The present invention relates to a construction method for the upper tower column of a variable-section special-shaped cable tower, comprising the following steps: construction of an auxiliary structure for the precise positioning of a circumferential prestressed pipe; installation of the circumferential prestressed pipe; assembly of a hoisting anti-deformation bracket for a rigid frame; construction of an auxiliary structure for the precise pre-assembly of guides for the rigid frame; installation of the rigid frame and steel bar binding; installation of steel brackets, steel anchor boxes, and steel anchor beams; installation of an adjustable assembled truss steel membrane; pouring and curing concrete for the upper tower column; tensioning of the circumferential prestressed tendons; construction of a cable installation structure; installation and tensioning of the cable; and installation of the next upper tower column. The present invention has the following beneficial effects: the use of a hoisting anti-deformation bracket has an ingenious structural design, is convenient to assemble and disassemble, is recyclable, and has a high turnover efficiency. It can also adapt to the hoisting of rigid frames of different cross-sectional sizes, solving the hoisting problem of the upper tower column of a variable-section special-shaped cable tower and having broad application prospects.

Description

Technical Field

[0001] The invention belongs to the field of civil engineering, and in particular relates to a construction method for an upper tower column of a variable-section special-shaped cable tower, which is suitable for the construction of an upper tower column of a variable-section special-shaped cable tower. Background Art

[0002] With the significant improvement in bridge construction in my country, cable-stayed bridges have become widely used and are gaining increasing attention for their inherent advantages. Their perfect overall linear continuity and environmental beautification add a beautiful touch to urban rail transit. However, due to the exceptionally complex nature of their structural stresses and deformations, theoretical analysis methods remain incomplete and inaccurate. Many issues warrant further study, and relevant experience must be accumulated to provide a reference for future similar projects.

[0003] Tower columns are typically constructed using a rigid frame in conjunction with climbing formwork. After each tower segment is completed, the rigid frame is connected, reinforcement is installed, and then the formwork is closed and concrete is poured, repeating the cycle. The rigid frame is designed to be permanently embedded in the concrete. In tower column designs, the rigid frame is generally not used as the primary reinforcement structure, but rather as an auxiliary construction measure. A single tower column rigid frame weighs hundreds or even thousands of tons, so this construction method results in a significant waste of steel. Furthermore, each section of the rigid frame requires significant labor time to fabricate and connect. Lifting the rigid frame is typically done with a truck crane, which can easily cause deformation during lifting, impacting the overall construction quality. As a load-bearing component supporting surveying and layout, main reinforcement installation, and formwork installation, quality installation is crucial. Joints between upper and lower segments must be secure, the number of horizontal connections and scissor braces must meet design requirements, welds must be full and meet regulatory requirements, and weld slag must be removed after welding to ensure sufficient rigidity throughout the rigid frame.

[0004] Therefore, how to achieve the rapid pouring of the upper tower column and the precise installation of the rigid frame is of vital importance. It is the key technology of on-site construction and the most difficult point of the entire construction. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a construction method for an upper tower column of a variable-section special-shaped cable tower.

[0006] The construction method of the upper tower column of the variable-section special-shaped cable tower comprises the following steps:

[0007] Step 1: Install the annular prestressed pipe: weld the hoop on the top of the inner parallel joint of the rigid frame, weld the support plate on the top of the diagonal brace between the frames and the inner diagonal brace of the frame; install the annular prestressed pipe after the annular prestressed tendons pass through the annular prestressed pipe;

[0008] Step 2: Installation of the rigid frame: Install the hoisting anti-deformation bracket and lock the sliding hanger plate according to the size of the rigid frame; set the precise pre-assembled guide auxiliary structure of the rigid frame on the top of the installed rigid frame; bolt the sliding hanger plate to the top of the upper rigid frame, then hoist and splice the rigid frame and weld it, and tie the steel cage of the upper tower column;

[0009] Step 3: Install the steel corbel, steel anchor box and steel anchor beam: hoist the steel corbel and weld it to the corbel wall plate; place the steel anchor beam on the steel corbel support top plate; hoist the steel anchor box onto the steel anchor beam and then secure it;

[0010] Step 4: Install the adjustable assembled truss steel formwork: Install the adjustable assembled truss steel formwork on the top of the lower tower column, cooperate with the construction platform to carry out the climbing formwork of the upper tower column, and cast the upper tower column;

[0011] Step 5: Circumferential prestressed tendons are tensioned: Circumferential prestressed tendons are arranged in a staggered pattern on the sides of the upper tower column, and tensioned using tensioning anchors.

[0012] Step 6. Installation of stay cables: First install temporary cables between the sides of the upper and lower tower columns and the box beams of the steel-concrete joint section, and then install the stay cables.

[0013] Preferably, in step one: the skeleton columns of the rigid skeleton are connected into an integral skeleton through longitudinal parallel links between the skeletons and transverse parallel links between the skeletons, inter-skeleton diagonal braces and inner-skeleton parallel links are provided between the longitudinal parallel links between the skeletons, and inner-skeleton parallel links and inner-skeleton diagonal braces are provided between the transverse parallel links between the skeletons; the annular prestressed pipes include prestressed pipes at corners, and the hoop is densely arranged at the position of the prestressed pipe at the corner, and the hoop is welded at the top of the longitudinal parallel links between the skeletons and the transverse parallel links between the skeletons.

[0014] Preferably, the hoisting anti-deformation bracket of the rigid frame includes a hoisting anti-deformation bracket main beam, a sliding hanger plate, a slide rail, a diagonal brace, a transverse brace and a connecting rod; the hoisting anti-deformation bracket main beams are connected into an integral frame through diagonal braces and transverse braces, a plurality of reserved holes are provided on the side of the hoisting anti-deformation bracket main beam, and the hoisting anti-deformation bracket main beam is provided with a slide rail; the sliding hanger plate is respectively provided with ear plates on the top and bottom, the sliding hanger plate is placed in the slide rail, and is fixed by screws and fixing nuts.

[0015] Preferably, step two is as follows: install the sliding hanger plate in the sliding rail of the main beam of the hoisting anti-deformation bracket, and lock it according to the size of the rigid frame to be installed, and the ear plates at the top and bottom of the sliding hanger plate are respectively connected to the hoisting wire rope and the Hulusi; weld the positioning steel bars to the inner frame column at the top of the installed rigid frame, and weld the splicing baffle to the outer side surface of the top of the rigid frame; hoist the anti-deformation bracket into place, and then bolt the Hulusi to the top of the rigid frame to be installed, and then hoist the rigid frame to the installation position, the inner frame of the rigid frame to be installed is clamped in the inner frame positioning support plate, and the outer frame is clamped in the splicing baffle, and then the fine-tuning nut is used to perform local fine-tuning on the rigid frame to be installed, and then the rigid frames are welded, and then the steel cage of the upper tower column is tied.

[0016] Preferably, in step three: the steel corbel includes a steel corbel supporting side plate, a steel corbel supporting top plate and a wing plate, the sides of the steel corbel supporting side plates are evenly provided with perforations, and the shear nails of the corbel wall plate are welded to the steel corbel supporting side plates through the perforations; the steel corbel supporting top plate is arranged on the side surface of the top of the steel corbel supporting side plate, and the wing plate is arranged on the bottom of the steel corbel supporting top plate. At the same time, the wing plate is welded to the side surface of the steel corbel supporting side plate, and a lifting plate is provided on the outer side surface of the wing plate, and a lifting plate reserved hole is provided on the side surface of the lifting plate; the steel wire rope is connected to the reserved hole of the lifting plate, the steel corbel is lifted into place, and then the steel corbel is welded to the corbel wall plate; the suspension steel wire rope is connected to the steel anchor beam, and the other end of the suspension steel wire rope is connected to the lifting ring, and then the steel anchor beam is placed on the steel corbel supporting top plate by a crane; the steel anchor box is lifted on the steel anchor beam at the top of the steel corbel supporting top plate, and then the steel corbel, steel anchor box and steel anchor beam are fixed.

[0017] Preferably, in step four, the specific method of installing the adjustable assembled truss steel formwork on the top of the lower tower column is: use the crane of the tower crane to lift the horizontal side formwork and the longitudinal main formwork into place, and stabilize them with cross-pull rods and reinforcement trusses.

[0018] Preferably, in step five: the circumferential prestressed tendons are staggered on the side of the upper tower column, the circumferential prestressed tendons are anchored at the anchoring end, and at the tensioning end, the circumferential prestressed tendons are tensioned using tensioning anchors.

[0019] Preferably, in step six: temporary cable tooth blocks are installed on the sides of the upper tower column and the lower tower column, one end of the temporary cable is connected to the temporary cable tooth block, and the other end is fixed to the temporary anchor on the box girder of the steel-concrete joint section; when installing the inclined cable, one end of the inclined cable is fixed to the longitudinal beam of the main bridge or the bridge deck of the steel-concrete joint section, and the other end of the inclined cable is connected to the cable guide on the steel anchor box.

[0020] Preferably, after completing steps one to six, the adjustable assembled truss steel formwork and temporary cables are removed, and the climbing formwork construction of the next section of the upper tower column is carried out.

[0021] The upper tower column of the variable-section special-shaped cable tower is obtained according to any of the above methods.

[0022] The beneficial effects of the present invention are:

[0023] 1) The present invention relates to a hoisting anti-deformation bracket, which has an ingenious structural design, is easy to assemble and disassemble, can be recycled, and has a high turnover efficiency. At the same time, it can adapt to the hoisting of rigid skeletons with different cross-sectional sizes, solving the problem of hoisting the tower column of a variable-section special-shaped cable tower.

[0024] 2) The adjustable assembled truss steel formwork used in the present invention has a simple structural design and a fast construction speed. It can adapt to the special working conditions of the upper tower column of the variable-section special-shaped cable tower. It can be recycled and has a high turnover efficiency, shortening the construction period, saving costs, improving installation efficiency, and reducing manpower input. Compared with the traditional casting method, it can also save material waste and reduce construction costs.

[0025] 3) The precise positioning auxiliary structure of the annular prestressed pipe involved in the present invention has a scientific and reasonable design, effectively solves the problem of annular prestressed bundle threading, avoids the disadvantages of inconvenient operation at high altitude, is simple and quick to operate, improves construction efficiency, and improves the positioning accuracy and installation quality of the annular prestress, thereby improving economic benefits.

[0026] 4) The precise pre-assembly guide auxiliary structure of the rigid frame in the present invention is sophisticated in design and easy to operate, which effectively improves the installation accuracy and quality of the rigid frame and greatly improves the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the front view of the upper tower column template installation;

[0028] Figure 2 This is the cross-sectional view of the upper tower column template installation;

[0029] Figure 3 It is the longitudinal section of the upper tower column template;

[0030] Figure 4 This is the transverse section of the upper tower column template;

[0031] Figure 5 This is a detailed drawing of the upper tower column formwork construction platform;

[0032] Figure 6 This is the front view of the rigid skeleton of the upper tower column;

[0033] Figure 7 This is a schematic diagram of the auxiliary positioning structure of the annular prestressed pipe;

[0034] Figure 8 This is the installation diagram of the positioning ring structure on the parallel connection between the skeletons;

[0035] Figure 9 This is a top view of the positioning ring structure on the inter-frame parallel connection;

[0036] Figure 10 This is a schematic diagram of the arrangement of positioning and fixing steel bars at the diagonal bracing;

[0037] Figure 11 3D schematic diagram of the positioning and fixing of steel bars at the diagonal bracing;

[0038] Figure 12 This is a schematic diagram of the installation of the steel bar structure for positioning and fixing at the diagonal brace;

[0039] Figure 13 It is a schematic diagram of the arrangement of positioning steel bars at the skeleton nodes;

[0040] Figure 14 It is a schematic diagram of the setting of hoop prestressed tendons;

[0041] Figure 15 It is a plan view of the setting of hoop prestressed tendons;

[0042] Figure 16 It is a schematic elevation diagram of the setting of hoop prestressed tendons;

[0043] Figure 17 It is a schematic diagram of hoop prestressed tendon tensioning;

[0044] Figure 18 This is a schematic diagram of the upper tower column rigid frame and steel corbel hoisting;

[0045] Figure 19 This is a schematic diagram of the steel anchor beam hoisting;

[0046] Figure 20 It is a schematic diagram of the limiting angle steel and positioning steel bar;

[0047] Figure 21 This is a detailed structural diagram of a steel corbel;

[0048] Figure 22 It is the detailed structural drawing of positioning steel bars;

[0049] Figure 23 It is a standardized adjustable spreader plan;

[0050] Figure 24 It is a transverse cross-sectional view of the end of a standardized adjustable spreader;

[0051] Figure 25 It is a standard adjustable spreader elevation;

[0052] Figure 26 It is a three-dimensional diagram of the steel corbel detail structure;

[0053] Figure 27 It is the construction drawing of cable positioning.

[0054] In the figure: 1-upper tower column, 2-reinforcement truss, 3-construction platform, 4-lower tower column, 5-main bridge longitudinal beam, 6-lateral side formwork, 7-truss longitudinal plate, 8-adjustable truss steel formwork, 9-longitudinal main formwork, 10-through tie rod, 11-bolt, 12-jointing ear plate, 13-connecting sleeve, 14-jointing piece, 15-external connecting rod, 16-internal connecting rod, 17-stayed cable, 18-truss transverse plate, 19-external latch, 20-external latch fixing nut, 21- Temporary anchor, 22-fixing nut, 23-fixing screw, 24-internal pin fixing nut, 25-internal pin, 26-pier, 27-rigid frame, 28-inter-frame diagonal brace, 29-wire rope, 30-connecting plate, 31-lifting ring, 32-steel corbel support side plate, 33-perforation, 34-lifting plate reserved hole, 35-lifting plate, 36-steel corbel support top plate, 37-steel corbel, 38-wing plate, 39-support plate, 40-frame column , 41-annular prestressed pipe, 42-longitudinal parallel connection between skeletons, 43-hoop, 44-inner parallel connection of skeleton, 45-inner diagonal brace of skeleton, 46-prestressed pipe at corner, 47-horizontal parallel connection between skeletons, 48-arc support plate, 49-annular prestressed tendons, 50-steel anchor beam, 51-corbel wall plate, 52-steel anchor box, 53-anchor end, 54-tensioning end, 55-tensioning anchor, 56-cable conduit, 57-suspension wire rope, 58-lifting ring, 59-fixed Position steel bars, 60-fine-tuning nuts, 61-splicing baffles, 62-internal skeleton positioning support plates, 63-hoisting wire ropes, 64-hoisting anti-deformation bracket main beams, 65-sliding hangers, 66-screws, 67-fixing nuts, 68-reserved holes, 69-Hulusi, 70-hoisting anti-deformation brackets, 71-slide rails, 72-ear plates, 73-diagonal braces, 74-horizontal braces, 75-connecting rods, 76-temporary cable tooth blocks, 77-steel-concrete joint sections, 78-temporary cables. DETAILED DESCRIPTION

[0055] The present invention will be further described below with reference to the following examples. The following examples are provided only to facilitate understanding of the present invention. It should be noted that, without departing from the principles of the present invention, it is possible for a person skilled in the art to make various modifications to the present invention, and such improvements and modifications fall within the scope of the claims of the present invention.

[0056] Example 1

[0057] As an embodiment, a construction method for an upper tower column of a variable-section special-shaped cable tower includes the following steps:

[0058] Step 1: Construction of auxiliary structures for precise positioning of the annular prestressed pipe 41: Weld the hoop 43 on the top of the inner parallel joint 44 of the rigid frame 27, weld the support plate 39 on the top of the inter-frame diagonal brace 28 and the inner-frame diagonal brace 45, and weld the arc support plate 48 between the support plates 39; at the position of the prestressed pipe 46 at the corner, it is necessary to densely arrange the hoop 43, and weld the hoop 43 on the top of the inter-frame longitudinal parallel joint 42 and the inter-frame transverse parallel joint 47;

[0059] Installation of the annular prestressed pipe 41: pass the annular prestressed reinforcement 49 through the annular prestressed pipe 41, and then install the annular prestressed pipe 41 on the hoop 43 and the arc support plate 48 and fix them;

[0060] Step 2: Assemble the anti-deformation bracket 70 for the hoisting of the rigid frame 27: Install the sliding hanger plate 65 in the slide rail 71 of the main beam 64 of the hoisting anti-deformation bracket, and then lock the sliding hanger plate 65 with screws 66 and fixing nuts 67 according to the size of the rigid frame 27 to be hoisted. Connect the ear plate 72 at the top of the sliding hanger plate 65 with the hoisting wire rope 63, and connect the ear plate 72 at the bottom of the sliding hanger plate 65 to the Hulusi 69;

[0061] Precise pre-assembly guide auxiliary structure construction of the rigid frame 27: Weld the customized positioning steel bars 59 to the inner frame columns at the top of the installed rigid frame 27, and weld the splicing baffles 61 to the outer side surface of the top of the installed rigid frame 27;

[0062] Installation of the rigid frame 27 and tying of steel bars: Use the crane of the tower crane to hoist the anti-deformation bracket 70 into place, then bolt the Hulusi 69 to the top of the rigid frame 27 to be hoisted, then hoist the rigid frame 27 to the installation position, the inner frame of the rigid frame 27 to be installed is fixed in the inner frame positioning support plate 62, the outer frame of the rigid frame 27 to be installed is fixed in the splicing baffle 61, then fine-tune the rigid frame 27 to be installed with the fine-tuning nut 60, then weld the rigid frame 27, and then tie the steel cage of the upper tower column 1;

[0063] Step 3, installation of steel corbel 37, steel anchor box 52 and steel anchor beam 50: connect the steel wire rope 29 to the reserved hole 34 of the hoisting plate, then use the crane to hoist the steel corbel 37 into place, and then weld the steel corbel 37 to the corbel wall plate 51; connect the suspension steel wire rope 57 to the steel anchor beam 50, and the other end of the suspension steel wire rope 57 to the lifting ring 58, and then use the crane to place the steel anchor beam 50 on the steel corbel support top plate 36; hoist the steel anchor box 52 to the steel anchor beam 50 on the top of the steel corbel support top plate 36, and then fix the steel corbel 37, steel anchor box 52 and steel anchor beam 50;

[0064] Step 4: Install the adjustable assembled truss steel membrane 8: Install the adjustable assembled truss steel membrane 8 on the top of the completed lower tower column 4, use the tower crane to assemble the horizontal side form 6, the longitudinal main form 9, and the through-pull rod 10 into place, and then assemble the adjustable assembled truss steel membrane 8 on the top of the lower tower column 4, and then use the through-pull rod 10 and the reinforcement truss 2 to stabilize it;

[0065] Concrete pouring and curing of the upper tower column 1: Use the adjustable assembled truss steel membrane 8 and the construction platform 3 to carry out climbing formwork construction of the upper tower column 1, pour the concrete of the upper tower column 1, and cure it to the specified strength;

[0066] Step 5: Tensioning the hoop prestressed tendons 49: The hoop prestressed tendons 49 are evenly and staggeredly arranged on the side of the upper tower column 1. The hoop prestressed tendons 49 are anchored at the anchoring end 53. At the tensioning end 54, the hoop prestressed tendons 49 are tensioned using the tensioning anchor 55.

[0067] Step 6: Installation of the stay cable 17: Install temporary cable tooth blocks 76 on the sides of the upper tower column 1 and the lower tower column 4, connect one end of the temporary cable 78 to the temporary cable tooth block 76, and fix the other end to the temporary anchor 21 on the box girder of the steel-concrete joint section 77;

[0068] Installation and tensioning of the stay cables 17: Install the stay cables 17 on the upper pylon 1. One end of the stay cables 17 is fixed to the main bridge longitudinal beam 5 or the bridge deck of the steel-concrete joint section 77. The other end of the stay cables 17 is connected to the cable guide 56 on the steel anchor box 52.

[0069] Install the next section of the upper tower column 1: remove the adjustable assembled truss steel membrane 8 and the temporary cable 78, and carry out the climbing formwork construction of the next section of the upper tower column 1.

[0070] Example 2

[0071] As another embodiment, according to the construction method of the variable-section special-shaped cable tower upper tower column proposed in Example 1, a variable-section special-shaped cable tower upper tower column is obtained, such as Figures 1 to 27As shown, the components involved include: upper tower column 1, reinforcement truss 2, construction platform 3, lower tower column 4, main bridge longitudinal beam 5, transverse side formwork 6, truss longitudinal plate 7, adjustable truss steel formwork 8, longitudinal main formwork 9, through-pull rod 10, bolt 11, docking ear plate 12, connecting sleeve 13, docking piece 14, outer connecting rod 15, inner connecting rod 16, inclined cable 17, truss transverse plate 18, outer pin 19, outer pin fixing nut 2 0, temporary anchor 21, fixing nut 22, fixing screw 23, external pin fixing nut 24, internal pin 25, pier 26, rigid frame 27, inter-frame diagonal brace 28, wire rope 29, connecting plate 30, lifting ring 31, steel corbel support side plate 32, perforation 33, lifting plate reserved hole 34, lifting plate 35, steel corbel support top plate 36, steel corbel 37, wing plate 38, support plate 39, frame column 40. Circumferential prestressed pipe 41. Inter-frame longitudinal joint 42. Hoop 43. Internal joint 44. Internal brace 45. Prestressed pipe at corner 46. Inter-frame transverse joint 47. Arc support 48. Circumferential prestressed tendons 49. Steel anchor beam 50. Corbel wall 51. Steel anchor box 52. Anchor end 53. Tensioning end 54. Tensioning anchor 55. Cable guide 56. Suspension wire rope 57. Lifting ring 58. Positioning Rebar 59, fine-tuning nut 60, splicing baffle 61, inner skeleton positioning support plate 62, lifting wire rope 63, lifting anti-deformation bracket main beam 64, sliding hanger 65, screw 66, fixing nut 67, reserved hole 68, Hulusi 69, lifting anti-deformation bracket 70, slide rail 71, ear plate 72, diagonal brace 73, horizontal brace 74, connecting rod 75, temporary cable tooth block 76, steel-concrete joint section 77, temporary cable 78.

[0072] Structurally, the upper tower column of the variable-section special-shaped cable tower includes an adjustable assembled truss steel formwork 8, a hoisting anti-deformation bracket 70 for the rigid frame 27, a precise positioning auxiliary structure for the annular prestressed pipe 41, a precise pre-assembly guide auxiliary structure for the rigid frame 27, and an installation structure for the inclined cable 17.

[0073] The adjustable assembled truss steel formwork 8 is located on the outside of the upper tower column 1, and is mainly composed of a transverse side formwork 6, a longitudinal main formwork 9, and a through-pull rod 10. The transverse side formwork 6 and the longitudinal main formwork 9 are assembled into an integral formwork, and the longitudinal main formwork 9 are fixed by through-pull rods 10 and bolts 11. The transverse side formwork 6 is reinforced by a transverse reinforcement truss 2, an external connecting rod 15 and an internal connecting rod 16; a truss longitudinal plate 7 is provided on the outside of the longitudinal main formwork 9, and the truss longitudinal plate 7 is connected to the longitudinal reinforcement truss 2; a docking ear plate 12 is provided on the outside of the transverse side formwork 6, and the external connecting rod 15 is docked with the docking ear plate 12, and is fixed with an internal pin fixing nut 24 and an internal pin 25; the internal connecting rod 16 is connected to the docking piece 14 through an external pin 19 and an external pin fixing nut 20, and the docking piece 14 is provided on the inner side of the truss transverse plate 18, and the truss transverse plate 18 is located on the inner side of the transverse reinforcement truss 2.

[0074] The hoisting anti-deformation bracket 70 of the rigid frame 27 is mainly composed of a hoisting anti-deformation bracket main beam 64, a sliding hanger plate 65, a slide rail 71, a diagonal brace 73, a transverse brace 74, and a connecting rod 75; the hoisting anti-deformation bracket main beams 64 are connected to form an integral frame through the diagonal brace 73 and the transverse brace 74, and the hoisting anti-deformation bracket main beam 64 is provided with a plurality of reserved holes 68 on the side, and the top and bottom of the hoisting anti-deformation bracket main beam 64 are respectively provided with slide rails 71; the top and bottom of the sliding hanger plate 65 are respectively provided with ear plates 72, and the sliding hanger plate 65 is placed in the slide rail 71, so as to be clamped on the outside of the hoisting anti-deformation bracket main beam 64, and is fixed by screws 66 and fixing nuts 67; the sliding hangers 65 are connected by a connecting rod 75, and the screws 66 pass through the hoisting anti-deformation bracket main beam 64 and the sliding hanger plate 65 in turn, and are then fixed with fixing nuts 67. The ear plate 72 at the bottom of the sliding hanger 65 is connected to the Hulusi 69, and the Hulusi 69 is connected to the top of the rigid frame 27 to be hoisted; the ear plate 72 at the top of the sliding hanger 65 is connected to the hoisting wire rope 63, and the other end of the hoisting wire rope 63 is connected to the hoisting ring 31.

[0075] The steel corbel 37 is mainly composed of a steel corbel support side plate 32, a steel corbel support top plate 36, and a wing plate 38. The sides of the steel corbel support side plate 32 are evenly provided with perforations 33, and the shear nails of the corbel wall plate 51 are welded to the steel corbel support side plate 32 through the perforations 33; the steel corbel support top plate 36 is arranged on the top side of the steel corbel support side plate 32, and the wing plate 38 is arranged at the bottom of the steel corbel support top plate 36. At the same time, the wing plate 38 is welded to the side of the steel corbel support side plate 32, and the outer side of the wing plate 38 is provided with a hanging plate 35, and the side of the hanging plate 35 is provided with a hanging plate reserved hole 34.

[0076] The skeleton columns 40 of the rigid skeleton 27 are connected into an integral skeleton through the skeleton longitudinal parallel links 42 and the skeleton transverse parallel links 47. The skeleton diagonal braces 28 and the skeleton inner parallel links 44 are arranged between the skeleton longitudinal parallel links 42, and the skeleton inner parallel links 44 and the skeleton inner diagonal braces 45 are arranged between the skeleton transverse parallel links 47.

[0077] The precise positioning auxiliary structure of the annular prestressed pipe 41 is mainly composed of a support plate 39, a hoop 43, and an arc support plate 48. The support plate 39 is arranged at the top of the inter-frame diagonal brace 28 and the internal frame diagonal brace 45. The support plate 39 has a trapezoidal structure. An arc support plate 48 is arranged between the support plates 39. The hoop 43 is arranged at the top of the internal flat link 44 of the frame. The annular prestressed pipe 41 is placed in the hoop 43 and the arc support plate 48.

[0078] The precise pre-assembly guide auxiliary structure of the rigid frame 27 is mainly composed of positioning steel bars 59, fine-tuning nuts 60, splicing baffles 61, and inner frame positioning support plates 62. The positioning steel bars 59 are welded to the inner frame columns at the top of the installed rigid frame 27. The side of the inner frame positioning support plate 62 is welded to the side of the positioning steel bars 59 through the connecting plate 30. The splicing baffle 61 is welded to the outer side surface of the top of the installed rigid frame 27, and the fine-tuning nuts 60 are placed in the middle of the side of the splicing baffle 61.

[0079] The installation structure of the inclined cable 17 is mainly composed of a temporary anchor 21, a temporary cable tooth block 76, and a temporary cable 78. The temporary cable tooth block 76 is arranged on the side of the upper tower column 1 and the lower tower column 4. The temporary anchor 21 is arranged on the box girder of the steel-concrete combined section 77. One end of the temporary cable 78 is connected to the temporary cable tooth block 76, and the other end is fixed to the temporary anchor 21.

Claims

1. A construction method for the upper tower column of a variable-section special-shaped cable tower, characterized in that: The following steps are involved: Step 1, installation of the annular prestressed pipe (41): welding a hoop (43) on the top of the inner flat joint (44) of the rigid frame (27), and welding a support plate (39) on the top of the inter-frame diagonal brace (28) and the inner frame diagonal brace (45); installing the annular prestressed pipe (41) after the annular prestressed tendons (49) pass through the annular prestressed pipe (41); Step 2, installation of the rigid frame (27): Install the hoisting anti-deformation bracket (70) and lock the sliding hanger (65) according to the size of the rigid frame (27); set the precise pre-assembled guide auxiliary structure of the rigid frame (27) on the top of the installed rigid frame (27); bolt the sliding hanger (65) to the top of the upper rigid frame (27), then hoist and splice the rigid frame (27) and weld it, and tie the steel cage of the upper tower column (1); Step 3, installation of steel corbels (37), steel anchor boxes (52) and steel anchor beams (50): hoist the steel corbels (37) and weld them to the corbel wall panels (51); place the steel anchor beams (50) on the steel corbel support top plates (36); hoist the steel anchor boxes (52) on the steel anchor beams (50) and then secure them; Step 4: Installing the adjustable truss steel formwork (8): Install the adjustable truss steel formwork (8) on the top of the lower tower column (4), cooperate with the construction platform (3) to perform the climbing formwork of the upper tower column (1), and cast the upper tower column (1); Step 5: tensioning the circumferential prestressed tendons (49): the circumferential prestressed tendons (49) are arranged in a staggered manner on the side of the upper tower column (1), and the circumferential prestressed tendons (49) are tensioned using tensioning anchors (55); Step 6, installation of the inclined cable (17): first install temporary cables (78) between the sides of the upper tower column (1) and the lower tower column (4) and the box beam of the steel-concrete joint section (77), and then install the inclined cable (17); In step 1, the frame columns (40) of the rigid frame (27) are connected to form an integral frame through the frame longitudinal parallel joints (42) and the frame transverse parallel joints (47), the frame diagonal braces (28) and the frame inner parallel joints (44) are provided between the frame longitudinal parallel joints (42), and the frame inner parallel joints (44) and the frame inner diagonal braces (45) are provided between the frame transverse parallel joints (47); the annular prestressed pipe (41) includes a corner prestressed pipe (46), the hoop (43) is densely arranged at the position of the corner prestressed pipe (46), and the hoop (43) is welded at the top of the frame longitudinal parallel joints (42) and the frame transverse parallel joints (47); The hoisting anti-deformation bracket (70) of the rigid frame (27) includes a hoisting anti-deformation bracket main beam (64), a sliding hanger (65), a slide rail (71), a diagonal brace (73), a transverse brace (74) and a connecting rod (75); the hoisting anti-deformation bracket main beam (64) is connected to form an integral frame through the diagonal brace (73) and the transverse brace (74); a plurality of reserved holes (68) are provided on the side of the hoisting anti-deformation bracket main beam (64), and the hoisting anti-deformation bracket main beam (64) is provided with a slide rail (71); the sliding hanger (65) is provided with ear plates (72) at the top and bottom, respectively, and the sliding hanger (65) is placed in the slide rail (71) and fixed by screws (66) and fixing nuts (67).

2. The construction method of the upper tower column of the variable-section special-shaped cable tower according to claim 1 is characterized in that: Step 2 is specifically as follows: install the sliding hanger (65) in the slide rail (71) of the main beam (64) of the hoisting anti-deformation bracket, and lock it according to the size of the rigid frame (27) to be installed, and connect the ear plates (72) at the top and bottom of the sliding hanger (65) to the hoisting wire rope (63) and the Hulusi (69) respectively; weld the positioning steel bar (59) to the inner frame column at the top of the installed rigid frame (27), and weld the splicing baffle (61) to the outer side surface of the top of the rigid frame (27); The bracket (70) is hoisted into place, and then the Hulusi (69) is bolted to the top of the rigid frame (27) to be installed, and then the rigid frame (27) is hoisted to the installation position, the inner frame of the rigid frame (27) to be installed is fixed in the inner frame positioning support plate (62), and the outer frame is fixed in the splicing baffle (61), and then the fine-tuning nut (60) is used to perform local fine-tuning on the rigid frame (27) to be installed, and then the welding between the rigid frames (27) is performed, and then the steel cage of the upper tower column (1) is tied.

3. The construction method of the upper tower column of the variable-section special-shaped cable tower according to claim 1 is characterized in that: In step three: the steel corbel (37) includes a steel corbel support side plate (32), a steel corbel support top plate (36) and a wing plate (38), the side of the steel corbel support side plate (32) is evenly provided with perforations (33), and the shear nails of the corbel wall plate (51) are welded to the steel corbel support side plate (32) through the perforations (33); the steel corbel support top plate (36) is provided on the top side of the steel corbel support side plate (32), and the wing plate (38) is provided on the bottom of the steel corbel support top plate (36), and the wing plate (38) is welded to the side of the steel corbel support side plate (32), and the outer side of the wing plate (38) is provided with a hanging plate (35). A hoisting plate reserved hole (34) is provided on the side of (35); the steel wire rope (29) is connected to the hoisting plate reserved hole (34), the steel corbel (37) is hoisted into place, and then the steel corbel (37) is welded to the corbel wall plate (51); the suspension steel wire rope (57) is connected to the steel anchor beam (50), and the other end of the suspension steel wire rope (57) is connected to the lifting ring (58), and then the steel anchor beam (50) is placed on the steel corbel support top plate (36) by a crane; the steel anchor box (52) is hoisted to the steel anchor beam (50) at the top of the steel corbel support top plate (36), and then the steel corbel (37), the steel anchor box (52) and the steel anchor beam (50) are fixed.

4. The construction method of the upper tower column of the variable-section special-shaped cable tower according to claim 1 is characterized in that: In step 4, the specific method for installing the adjustable truss steel formwork (8) on the top of the lower tower column (4) is as follows: using the crane of the tower crane to hoist the horizontal side formwork (6) and the longitudinal main formwork (9) into place, and using the through-pull rods (10) and the reinforcement trusses (2) to stabilize them.

5. The construction method of the upper tower column of the variable-section special-shaped cable tower according to claim 1 is characterized in that: In step five, the circumferential prestressed tendons (49) are arranged in a staggered manner on the side of the upper tower column (1), the circumferential prestressed tendons (49) are anchored at the anchoring end (53), and the circumferential prestressed tendons (49) are tensioned at the tensioning end (54) using a tensioning anchor (55).

6. The construction method of the upper tower column of the variable-section special-shaped cable tower according to claim 1 is characterized in that: In step six: temporary cable tooth blocks (76) are installed on the sides of the upper tower column (1) and the lower tower column (4), one end of the temporary cable (78) is connected to the temporary cable tooth block (76), and the other end is fixed to the temporary anchor (21) on the box girder of the steel-concrete combined section (77); when installing the inclined cable (17), one end of the inclined cable (17) is fixed to the main bridge longitudinal beam (5) or the bridge deck of the steel-concrete combined section (77), and the other end of the inclined cable (17) is connected to the cable guide (56) on the steel anchor box (52).

7. The construction method of the upper tower column of the variable-section special-shaped cable tower according to claim 1 is characterized in that: After completing steps one to six, the adjustable truss steel formwork (8) and the temporary cables (78) are removed, and the climbing formwork construction of the next section of the upper tower column (1) is carried out.

8. The upper tower column of the variable-section special-shaped cable tower is characterized by: Obtained according to any one of claims 1 to 7.

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