Double-tower space cable rigid suspender suspension bridge structure and construction method

Abstract

The invention relates to the technical field of bridge construction, in particular to a double-tower space cable rigid suspender suspension bridge structure and a construction method. The main cable of the suspension bridge adopts a space cable surface, the longitudinal and planar projections of the main cable between the two tower columns are parabolas, and the planar projection lines of the two main cables are gradually close to each other in the direction from the side span to the middle span. A suspension bridge suspender is a rigid suspender and is in a paper-cut garland shape on the whole, a single suspender is in a special-shaped X shape, and the size of the suspender is gradually reduced from a side span to a middle span. Horizontal inhaul cables and rigid chord members are arranged between main cables of the suspension bridge, and the whole bridge is in a horn mouth shape. According to the suspension bridge, main components and accessories are installed through a floating crane, horizontal inhaul cables and vertical temporary suspenders between main cables are installed firstly, the line shape of the finished bridge main cables is determined, and then chord members and rigid suspenders are installed. The method is high in construction speed, low in cost and high in installation efficiency.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bridge construction, and particularly relates to a double-tower space cable rigid suspender suspension bridge structure and a construction method. BACKGROUND

[0002] The suspension bridge is a flexible suspension system composed of a main cable, a main beam, a main tower, a saddle, an anchor, a suspender and the like. The main cable is a main load-bearing component in the structural system, is suspended on the main tower through a tower top cable saddle and is anchored in two end anchoring bodies. The main tower is a main load-bearing component of the suspension bridge for resisting vertical load. The main beam mainly bears wind load and other horizontal loads. The suspender transmits the self weight and external load of the main beam to the main cable. The anchor is a structure for anchoring the main cable and transmits the tension in the main cable to the foundation. Common main cables of the suspension bridge are arranged in parallel, and the main cable and the suspender are in the same plane. The suspender of the suspension bridge is generally a flexible structure such as a steel wire rope, a steel strand or a parallel steel wire bundle. The suspender has a straight suspender and an inclined suspender, and a rigid suspender is less used.

[0003] With the development of bridge construction technology, more and more suspension bridges with different shapes have appeared. The suspension bridges have novel and unique structures, are creative, and are full of natural and artistic beauty and interest. The space cable suspension bridge converts the traditional parallel main cable into a space cable net system, increases the three-dimensional landscape effect of the bridge, and the space cable can provide lateral tension for the deck system of the suspension bridge, so that the deck system is in a space stress state and the stability is enhanced. When the suspender of the suspension bridge is a rigid suspender, various shapes can be designed under the premise of meeting the stress requirement, and the landscape effect of the bridge is increased.

[0004] For the double-tower space cable rigid suspender suspension bridge structure, a new construction method needs to be found to complete the bridge construction. SUMMARY

[0005] The application aims to overcome the defects of the prior art and provide a double-tower space cable rigid suspender suspension bridge structure and a construction method.

[0006] The application is implemented by the following technical scheme. The double-tower space cable rigid suspender suspension bridge structure comprises a tower column pile foundation and a main beam. The main beam is located between the two tower column pile foundations. The two ends of the main beam are fixed with anchors. Two main cables are anchored between the two anchors. A plurality of rigid suspenders are arranged and fixed between each main cable and the main beam. The top parts of the rigid suspenders on the two sides are connected and fixed by an upper chord. Cable clamps are installed inside the upper chord on the front and back sides. Upper chord cables are connected between the cable clamps on the two sides.

[0007] Further, the top end of the tower column pile foundation is provided with a bearing platform, the top end of the bearing platform is fixedly installed with a tower column, the top of the tower column is fixedly installed with a cable saddle, the top of the tower column on the same side is fixedly connected with a tower column cross beam, the main cable on both sides respectively penetrates through the cable saddles, the anchorage bottom end is provided with a plurality of anchorage pile foundations, the main beam bottom end is provided with a plurality of main beam pile foundations, and the main beam and the main beam pile foundation are fixedly supported through a main beam cushion stone and a main beam support.

[0008] Further, the main cable of the suspension bridge adopts a space cable surface, and the main cable plane projection line features that the two main cables are arranged in parallel between the anchorage and the tower column, and the distance is L1; after the main cable passes through the cable saddle, the main cable gradually approaches the bridge center line in the bridge direction in the form of a parabola towards the midspan direction; and the main cable distance at the midspan position is L2. The main cable elevation feature of the suspension bridge is that the main cable adopts a straight line form between the anchorage and the tower column, and adopts a parabolic form between the two tower columns.

[0009] Through the above technical scheme, the space cable surface of the main cable is parallel between the anchorage and the tower column, and approaches the midspan, which reduces the use of materials, improves the structural stability, and simplifies the construction by parallel arrangement; the straight line segment can reduce stress concentration, and the parabola can optimize the stress distribution, so that the load is more uniform, and materials are saved.

[0010] Further, the rigid suspender has a paper-cutting pattern shape, a single rigid suspender has a special-shaped "X" shape, is symmetrically arranged along the bridge span center line, the single rigid suspender has a bridge direction size a n , a left end height h n-1 , a right end height h n , the single rigid suspender bridge direction size a n and the height h n gradually decrease towards the midspan direction, and the vertical heights h n-1 and h n of the left and right ends of the single rigid suspender are equal to the height difference between the main cable and the main beam at the anchoring point. The angle between the plane axis of the single rigid suspender and the bridge transverse direction is d n , which is the angle between the tangent of the main cable plane at the intersection position of the left and right ends of the rigid suspender and the transverse direction. The single rigid suspender adopts a steel box structure, which is composed of an upper sealing plate, a rigid suspender bolt hole, a lower sealing plate, a transverse partition plate, an inner edge plate, an outer edge plate, a web plate, and a vertical partition plate, the inner edge plate and the outer edge plate are fixed on the front and back sides of the upper sealing plate, the lower sealing plate, and the web plate, the transverse partition plate is arranged on the outer side walls of the inner edge plate and the outer edge plate, the vertical partition plate is fixedly installed between the two web plates, and the rigid suspender bolt hole is correspondingly arranged on the inner edge plate and the vertical partition plate.

[0011] According to the technical scheme, the single rigid suspender is shaped as a special-shaped "X", is symmetrically arranged, and gradually decreases in size, so that the weight is reduced, the gradually changing size is adapted to the change in the distance between the main cables, the structural efficiency is improved, the paper-cut decorative pattern is kept while the wind resistance is reduced, the angle between the plane axis of the single rigid suspender and the transverse bridge direction is equal to the tangent angle of the main cable, so that the stress of the suspender is more reasonable, the bending stress is reduced, the service life is prolonged, and installation is more convenient; and the steel box structure is high in strength and light in weight, and is suitable for bearing large loads.

[0012] Further, the top chord is a steel box structure, a maintenance hole is formed in the top of the top chord, main cable notches are formed in the front and rear panels of the top chord, and the distance Li between the two main cable notches is the distance between the two main cables at the position of the anchoring point.

[0013] According to the technical scheme, the maintenance hole facilitates inspection, the distance Li of the main cable notches corresponds to the distance between the main cables, the connection accuracy is improved, and installation errors are reduced.

[0014] Further, the cable clamp is composed of an upper cable clamp, a lower cable clamp, cable clamp bolts, and permanent suspender ears of the top chord, the lower cable clamp is located below the upper cable clamp, the lower cable clamp and the upper cable clamp are fixedly connected through the cable clamp bolts, the upper cable clamp is provided with two inner and outer ear plates, the lower cable clamp is provided with one ear plate, the upper cable clamp and the lower cable clamp are provided with cable clamp ear plate bolt reserved holes in the upper parts of the ear plates, the lower cable clamp ear plate is provided with a vertical temporary suspender reserved bolt hole in the lower part of the ear plate, and the inner ear plate of the upper cable clamp is provided with permanent suspender ears of the top chord.

[0015] According to the technical scheme, the split design facilitates installation, especially the use of the temporary suspender, the permanent suspender ears simplify subsequent processes, and the construction efficiency is improved.

[0016] Further, the top parts of the rigid suspenders are connected with the main cables through the cable clamp, the cable clamp ear plate bolt reserved holes of the two ear plates of the upper cable clamp are connected with the vertical partition plates of the two rigid suspenders through high-strength bolts, the cable clamp ear plate bolt reserved hole in the upper part of the ear plate of the lower cable clamp is connected with the inner edge plates of the two rigid suspenders, and the vertical temporary suspender reserved bolt hole in the lower part of the ear plate of the lower cable clamp is connected with the vertical temporary suspender.

[0017] According to the technical scheme, the high-strength bolts connect multiple components, the connection mode is reliable, the force is directly transmitted, welding deformation is reduced, and the overall structure is improved.

[0018] Further, the main beam is composed of a steel box beam, a cantilever arm, and a cantilever arm ear plate, the main beam of the side span part has no cantilever arm, the steel box beam has a width of (L1-a), the outer edge of the steel box beam of the middle span part is in a parabolic form, the width of the steel box beam gradually decreases towards the midspan, the width of the steel box beam at the midspan position is (L2-b), the anchor point position of the main beam of the middle span part is provided with a cantilever arm on the outer side of the steel box beam, the cantilever arm is provided with a cantilever arm ear plate, and the cantilever arm ear plate is connected with the inner edge plate of the lower end of the rigid suspender and the vertical partition plate by bolting and welding.

[0019] By the above technical solution, the gradually changing width reduces the self weight, the cantilever arm strengthens the connection, the bolting and welding combination improves the node strength, and the parabolic form optimizes the stress.

[0020] A construction method of a double-tower spatial cable rigid suspender suspension bridge structure, comprising the following steps: Step one: constructing a tower column pile foundation and a bearing platform, an anchor pile foundation and an anchor, a main beam pile foundation and a main beam cushion stone, a main beam support, installing a floating crane, and constructing a temporary support pier.

[0021] Step two: installing a main beam segment by using the floating crane and completing the welding connection between segments.

[0022] Step three: installing a tower column, a cable saddle, and a tower column cross beam by using the floating crane.

[0023] Step four: installing a main cable and tensioning to a designed tensioning force, and installing and positioning a cable clamp.

[0024] Step five: installing a main cable upper chord cable and a vertical temporary suspender, tensioning or fastening the upper chord cable and the vertical temporary suspender, and adjusting the main cable line shape to a bridge line shape.

[0025] Step six: installing a rigid suspender from the midspan to both sides by using the floating crane, temporarily pinning the rigid suspender with the cable clamp and the cantilever arm ear plate, and replacing the punch pin with a high-strength bolt after the installation of the rigid suspender is completed.

[0026] Step seven: lifting the upper chord beam by using the floating crane, installing from top to bottom, clamping into the main cable, and placing on the rigid suspender, and welding and fixing the upper chord beam with the rigid suspender after measurement and positioning.

[0027] Step eight: after the vertical temporary suspender is removed, the temporary support pier is removed, and the construction of a bridge deck system and other auxiliary structures is performed.

[0028] By the above method, the floating crane is used for hoisting large components such as the main beam and the tower column, the temporary support pier is used for auxiliary positioning, the difficulty of water operation is reduced, the interference with the existing waterway or highway is avoided, and the installation precision and efficiency are improved; The main cable is tensioned and the cable clamp is installed, the position of the cable clamp is dynamically adjusted by using the vertical temporary suspender, and the main cable line shape is accurately controllable; Replace high-strength bolts after temporary fixing by punching nails, cooperate with temporary suspender to fine-tune the position of the ear plate of the cable clamp, solve the problem of high-altitude hole alignment, and improve installation reliability and efficiency; After the upper chord rod is clamped into the main cable and rests on the rigid suspender, it is welded and fixed after positioning by measurement, thereby utilizing the rigid suspender as a temporary support and ensuring welding accuracy, and simplifying the high-altitude operation process.

[0029] Further, in step six, when installing the rigid suspender, the upper end is installed first and then the lower end, the rigid suspender is inserted into the cable clamp ear plate by using a floating crane, the rigid suspender is then lifted upwards, the lower end of the rigid suspender is inserted into the cantilever ear plate, hole alignment is performed, and punching nails are applied one by one, and in the process of hole alignment, the position of the cable clamp ear plate is adjusted by cooperating with tensioning and loosening the current position vertical temporary suspender by the floating crane, so as to facilitate the installation of the bolt hole.

[0030] Through the above method, orderly and accurate installation is realized, and the quality and efficiency of construction are improved.

[0031] The beneficial effects of the present application are as follows: (1) The suspension bridge of the present application adopts a space cable modeling, and the whole is in a symmetrical horn mouth modeling, which is unique, novel and has strong visual impact; (2) The upper chord cable and the upper chord rod are connected between the two main cables, which solves the problem of main cable linear positioning, and makes the overall bridge modeling more beautiful and has strong sense of hierarchy; (3) The cable clamp is bolted with the inner edge plate and the vertical partition plate of the two rigid suspenders, and the installation and removal of the vertical temporary suspender are also considered, which is beneficial to the quick installation of the rigid suspender; (4) The main beam of the suspension bridge is installed in situ by a floating crane, and other components are also installed by a floating crane, which has high construction efficiency and low cost. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a longitudinal section schematic view of the bridge of the present embodiment; Figure 2 It is a plane schematic view of the bridge of the present embodiment; Figure 3 It is a transverse section schematic view of the main tower of the bridge of the present embodiment; Figure 4 It is a transverse section schematic view of the midspan of the bridge of the present embodiment; Figure 5 It is a main cable plane linear arrangement drawing of the present embodiment; Figure 6 It is a main cable elevation linear arrangement drawing of the present embodiment; Figure 7 It is a rigid suspender elevation arrangement drawing of the present embodiment; Figure 8 It is a rigid suspender segment division drawing of the present embodiment; Figure 9 It is a rigid suspender elevation layout drawing of the present embodiment; Figure 10 Rigid boom plan view of the present embodiment; Figure 11 Rigid boom cross section view of the present embodiment; Figure 12 Top chord longitudinal section view of the present embodiment; Figure 13 Top chord plan view of the present embodiment; Figure 14 Top chord cross section view of the present embodiment; Figure 15 Cable clamp configuration view of the present embodiment; Figure 16 Cable clamp, rigid boom and vertical temporary boom installation view of the present embodiment; Figure 17 Main beam plan view of the present embodiment; Figure 18 Step one longitudinal section view of the present embodiment; Figure 19 Step two longitudinal section view of the present embodiment; Figure 20 Step three longitudinal section view of the present embodiment; Figure 21 Step four longitudinal section view of the present embodiment; Figure 22 Step five longitudinal section view of the present embodiment; Figure 23 Step five cross section view of the present embodiment; Figure 24 Step six longitudinal section view of the present embodiment; Figure 25 Step seven longitudinal section view of the present embodiment; Figure 26 Step eight longitudinal section view of the present embodiment.

[0033] Fig. 1 is a tower pile foundation; 2, a pile cap; 3, a tower; 4, a cable saddle; 5, a tower beam; 6, a main cable; 7, a main beam; 8, a rigid suspender; 9, an upper chord; 10, an anchor pile foundation; 11, an anchor; 12, a main beam pile foundation; 13, a main beam cushion stone; 14, a main beam support; 15, an upper chord cable; 16, a cable clamp; 17, an upper sealing plate; 18, a rigid suspender bolt hole; 19, a lower sealing plate; 20, a transverse partition plate; 21, an inner edge plate; 22, an outer edge plate; 23, a web plate; 24, a vertical partition plate; 25, an inspection hole; 26, a main cable slot; 27, an upper cable clamp; 28, a lower cable clamp; 29, a cable clamp bolt; 30, an upper chord cable permanent lifting lug; 31, a cable clamp lug plate bolt reserved hole; 32, a vertical temporary suspender reserved bolt hole; 33, a vertical temporary suspender; 34, a steel box girder; 35, a cantilever arm; 36, a cantilever arm lug plate; 41, a floating crane; 42, a temporary support pier. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0035] As shown in the drawings, Figures 1-4 A double-tower space cable rigid suspender suspension bridge structure, comprising a tower pile foundation 1, a main beam 7, the main beam 7 being located between the two tower pile foundations 1, the two ends of the main beam 7 being fixed with anchors 11, two main cables 6 being anchored between the two end anchors 11, a plurality of rigid suspenders 8 being arranged and installed between each main cable 6 and the main beam 7, the top portions of the two rigid suspenders 8 being connected and fixed by an upper chord 9, cable clamps 16 being installed inside the upper chord 9 on the front and back sides, and upper chord cables 15 being connected between the two cable clamps 16; A pile cap 2 is arranged at the top end of the tower pile foundation 1, a tower 3 is fixedly installed at the top end of the pile cap 2, a cable saddle 4 is fixedly installed at the top of the tower 3, a tower beam 5 is fixedly connected between the top portions of the towers 3 on the same side, the two main cables 6 pass through the two cable saddles 4 respectively, a plurality of anchor pile foundations 10 are arranged at the bottom end of the anchor 11, a plurality of main beam pile foundations 12 are arranged at the bottom end of the main beam 7, and the main beam 7 and the main beam pile foundation 12 are fixedly supported by a main beam cushion stone 13 and a main beam support 14.

[0036] As shown in the drawings, Figure 5 The main cable 6 of the suspension bridge adopts a space cable surface, and the main cable 6 plane projection line features are as follows: the two main cables 6 are arranged in parallel between the anchors 11 and the towers 3, the distance is L1, the main cable 6 gradually converges to the bridge center line direction after passing through the cable saddle 4 in the form of a parabola towards the midspan direction, the main cable distance at the midspan position is L2, the plane projection line is parallel between the anchor 11 and the tower 3, converges at the midspan, reduces material use, improves structural stability, and simplifies construction at the same time.

[0037] As shown in the accompanying drawings Figure 6 , the main cable 6 of the suspension bridge has the following features: the main cable 6 adopts a linear form between the anchorage 11 and the tower column 3 and a parabolic form between the two tower columns 3, the linear segment can reduce stress concentration, and the parabolic form can optimize stress distribution and make the load more uniform and save materials.

[0038] As shown in the accompanying drawings Figures 7-8 , the rigid suspender 8 has a paper-cutting flower-shaped appearance, each rigid suspender 8 has a special-shaped “X” appearance, is symmetrically arranged along the bridge span center line, and has a bridge longitudinal dimension a n , a left end height h n-1 , and a right end height h n , the bridge longitudinal dimension a n and the height h n of each rigid suspender 8 gradually decrease in the direction of the midspan, the vertical heights h n-1 and h n of the left and right ends of each rigid suspender 8 are equal to the height difference between the main cable 6 and the main beam 7 at the anchoring point, each rigid suspender 8 has a special-shaped “X” appearance, is symmetrically arranged, and has a gradually decreasing size, which can reduce the weight, adapt to the change of the main cable spacing, improve the structural efficiency, and reduce the wind resistance while maintaining the beauty.

[0039] As shown in the accompanying drawings Figure 9 , the angle between the plane axis of each rigid suspender 8 and the bridge transverse direction is d n , which is the angle between the tangent of the main cable 6 at the intersection position of the left and right ends of the rigid suspender 8 and the bridge transverse direction, the angle between the plane axis of each rigid suspender 8 and the bridge transverse direction is equal to the tangent angle of the main cable, which makes the suspender force more reasonable, reduces the bending stress, prolongs the service life, and is more convenient to install.

[0040] As shown in the accompanying drawings Figures 10-11 , each rigid suspender 8 adopts a steel box structure, which is composed of an upper sealing plate 17, a rigid suspender bolt hole 18, a lower sealing plate 19, a transverse partition plate 20, an inner edge plate 21, an outer edge plate 22, a web plate 23, and a vertical partition plate 24, the inner edge plate 21 and the outer edge plate 22 are respectively fixed on the front and back sides of the upper sealing plate 17, the lower sealing plate 19, and the web plate 23, the transverse partition plate 20 is arranged on the outer side walls of the inner edge plate 21 and the outer edge plate 22, the vertical partition plate 24 is fixedly installed between the two web plates 23, and the rigid suspender bolt hole 18 is correspondingly arranged on the inner edge plate 21 and the vertical partition plate 24, the steel box structure has high strength and light weight and is suitable for bearing large loads.

[0041] As shown in the accompanying drawings Figures 12-14As shown, the upper chord 9 is a steel box structure, and the top of the upper chord 9 is provided with an inspection hole 25, and the front and rear panels of the upper chord 9 are provided with main cable notches 26, and the distance Li between the two main cable notches 26 is the distance between the upstream and downstream two main cables 6 at the anchorage point position, the inspection hole 25 facilitates inspection, and the main cable notch 26 distance Li corresponds to the main cable spacing, which improves the connection accuracy and reduces the installation error.

[0042] As shown in the accompanying drawings, Figure 15 As shown, the cable clamp 16 is composed of an upper cable clamp 27, a lower cable clamp 28, a cable clamp bolt 29, and an upper chord cable permanent lifting lug 30. The lower cable clamp 28 is located below the upper cable clamp 27, and the lower cable clamp 28 and the upper cable clamp 27 are fixedly connected through the cable clamp bolt 29. The upper cable clamp 27 is provided with two inner and outer ear plates, and the lower cable clamp 28 is provided with one ear plate. The upper and lower cable clamp ear plate bolt pre-holes 31 are arranged on the upper and lower cable clamp ear plates. The lower cable clamp ear plate lower part is provided with a vertical temporary lifting rod pre-bolt hole 32. The upper chord cable permanent lifting lug 30 is arranged on the inner side ear plate of the upper cable clamp 27. The split design facilitates installation, especially the use of temporary lifting rods. The permanent lifting lug simplifies the subsequent process and improves construction efficiency.

[0043] As shown in the accompanying drawings, Figure 16 As shown, the top of the rigid lifting rod 8 is connected with the main cable 6 through the cable clamp 16. The cable clamp ear plate bolt pre-holes 31 of the two ear plates of the upper cable clamp 27 are connected with the vertical partition plates 24 of the two rigid lifting rods 8 through high-strength bolts, respectively. The upper part of the ear plate of the lower cable clamp 28 is connected with the inner edge plates 21 of the two rigid lifting rods 8 through the cable clamp ear plate bolt pre-holes 31. The lower part of the ear plate of the lower cable clamp 28 is connected with the vertical temporary lifting rod 33 through the vertical temporary lifting rod pre-bolt hole 32. The high-strength bolt connects multiple components, the connection mode is reliable, the force transmission is direct, the welding deformation is reduced, and the overall structure is improved.

[0044] As shown in the accompanying drawings, Figure 17 As shown, the main beam 7 is composed of a steel box beam 34, a cantilever arm 35, and a cantilever arm ear plate 36. The edge span part of the main beam 7 is not provided with the cantilever arm 35. The width of the steel box beam 34 is (L1-a). The outer edge of the steel box beam 34 in the middle span part is in the form of a parabola. The width of the steel box beam 34 gradually decreases in the direction of the span. The width of the steel box beam 34 at the position of the span is (L2-b). The anchor point position of the main beam 7 in the middle span part is provided with the cantilever arm 35 on the outer side of the steel box beam 34. The cantilever arm ear plate 36 is arranged on the cantilever arm 35. The cantilever arm ear plate 36 is connected with the lower end inner edge plate 21 and the vertical partition plate 24 of the rigid lifting rod 8 through bolting and welding. The gradually changing width reduces the self-weight. The cantilever arm 35 is strengthened. The bolting and welding combination improves the node strength. The parabolic shape optimizes the stress.

[0045] A construction method of a double-tower spatial cable rigid lifting rod suspension bridge structure, comprising the following steps: Step one: as shown in the accompanying drawings, Figure 18As shown, the construction includes the construction of the tower column pile foundation 1 and pile cap 2, anchor pile foundation 10 and anchor 11, main beam pile foundation 12 and main beam pad stone 13, main beam support 14, installation of floating crane 41, and construction of temporary support pier 42.

[0046] Step Two: As attached Figure 19 As shown, floating crane 41 was used to install the main beam in 7 segments, and welding connections were completed between the segments.

[0047] Step 3: As attached Figure 20 As shown, a floating crane 41 is used to install the tower column 3, cable saddle 4, and tower column crossbeam 5.

[0048] Step Four: As attached Figure 21 As shown, install the main cable 6 and tension it to the design tension, then install and position the cable clamp 16.

[0049] Step 5: As attached Figures 22-23 As shown, install the upper chord cable 15 and the vertical temporary suspender 33 of the main cable 6, and tension or tighten the upper chord cable 15 and the vertical temporary suspender 33 to adjust the main cable alignment to the bridge alignment.

[0050] Step Six: As attached Figure 24 As shown, a floating crane 41 is used to install rigid hangers 8 from the middle of the span to both sides. The rigid hangers 8 are temporarily pinned to the cable clamps 16 and the cantilever lugs 36 with punch pins. After all the rigid hangers 8 are installed, the punch pins are replaced with high-strength bolts in sequence and tightened into place.

[0051] In step six, when installing the rigid hanger 8, the upper end is installed first, followed by the lower end. The rigid hanger 8 is inserted into the ear plate of the cable clamp 16 using the floating crane 41. Then, the rigid hanger 8 is lifted upwards, and the lower end of the rigid hanger 8 is inserted into the cantilever ear plate 36. The holes are aligned, and punch pins are driven one by one. During the hole alignment process, the position of the ear plate of the cable clamp 16 is adjusted by using the floating crane 41 in conjunction with tensioning and relaxing the current position of the vertical temporary hanger 33, so as to facilitate the alignment of the bolt holes and achieve orderly and precise installation, thereby improving the quality and efficiency of construction.

[0052] Step Seven: As attached Figure 25 As shown, the upper chord 9 is lifted by the floating crane 41, installed from top to bottom, inserted into the main cable 6, and placed on the rigid suspender 8. After measurement and positioning, it is welded and fixed to the rigid suspender 8.

[0053] Step 8: As attached Figure 26 As shown, after removing the vertical temporary hanger 33, the temporary support 42 is removed, and the construction of the bridge deck system and other ancillary structures is carried out.

[0054] Through the above method, the hoisting of large components such as the main beam 7 and the tower column 3 is carried out by using the floating crane 41, the temporary support pier 42 is combined to assist positioning, the difficulty of water operation is reduced, the interference to the existing channel or highway is avoided, and the installation precision and efficiency are improved; By tensioning the main cable 6 and installing the cable clamp 16, the position of the cable clamp 16 is adjusted in combination with the vertical temporary hoist 33, so that the linear shape of the main cable 6 is accurately controllable; After temporary fixing by punching, the high-strength bolt is replaced, the positions of the cable clamp 16 and the cantilever ear plate 36 are fine-adjusted in combination with the temporary hoist, the high-altitude hole alignment problem is solved, and the installation reliability and efficiency are improved; After the upper chord 9 is clamped into the main cable 6 and is placed on the rigid hoist 8, the upper chord 9 is welded and fixed after positioning measurement, so that the rigid hoist 8 is used as a temporary support and the welding precision is ensured, and the high-altitude operation process is simplified.

[0055] The above is only a preferred embodiment of the present application, and is not used to limit the protection scope of the present application.

Claims

1. A double-pylon space cable rigid boom suspension bridge structure, comprising a pylon column pile foundation (1), a main beam (7) located between the two side pylon column pile foundations (1), characterized in that: Both ends of the main girder (7) are fixed with anchorages (11), two main cables (6) are anchored between the two end anchorages (11), a plurality of rigid hangers (8) are arranged between each main cable (6) and the main girder (7), the top of the rigid hangers (8) on both sides are connected and fixed by the top chord (9), the inside of the top chord (9) is provided with cable clamps (16) on the front and back sides, and the cable clamps (16) on both sides are connected with the upper chord cable (15).

2. A double-pylon space cable rigid boom suspension bridge structure according to claim 1, characterized in that, The top of the tower column pile foundation (1) is provided with a bearing platform (2), the top of the bearing platform (2) is fixedly installed with a tower column (3), the top of the tower column (3) is fixedly installed with a cable saddle (4), the top of the tower column (3) on the same side is fixedly connected with a tower column cross beam (5), and the main cables (6) on both sides pass through the cable saddles (4) respectively, the bottom of the anchorage (11) is provided with a plurality of anchorage pile foundations (10), and the bottom of the main girder (7) is provided with a plurality of main girder pile foundations (12). The main girder (7) and the main girder pile foundation (12) are fixedly supported by the main girder cushion stone (13) and the main girder support (14).

3. A double-pylon space cable rigid boom suspension bridge structure according to claim 1, characterized in that, The main cable (6) of the suspension bridge adopts a space cable surface, and the main cable (6) plane projection line features are that the two main cables (6) are arranged in parallel between the anchorages (11) and the tower columns (3), and the distance is L1; after the main cable (6) passes through the cable saddle (4), the main cable (6) gradually approaches the bridge center line direction in the form of a parabola towards the midspan direction, and the main cable distance at the midspan position is L2. The main cable (6) of the suspension bridge adopts a space cable surface, and the main cable (6) plane projection line features are that the two main cables (6) are arranged in parallel between the anchorages (11) and the tower columns (3), and the distance is L1; after the main cable (6) passes through the cable saddle (4), the main cable (6) gradually approaches the bridge center line direction in the form of a parabola towards the midspan direction, and the main cable distance at the midspan position is L2.

4. A double-pylon space cable rigid boom suspension bridge structure according to claim 1, characterized in that, The rigid hanger (8) has a paper-cut flower shape, and each rigid hanger (8) has an irregular "X" shape. They are symmetrically arranged along the center line of the bridge span. The longitudinal dimension of a single rigid hanger (8) is a. n The height of the left end is h n-1 The height of the right end is h n The longitudinal dimension a of a single rigid hanger (8) along the bridge. n and height h n The vertical height h at both ends of a single rigid hanger (8) gradually decreases towards the mid-span direction. n-1 and h n This is equal to the height difference between the main cable (6) and the main beam (7) at the anchorage point; The angle between the plane axis of the single rigid suspender (8) and the transverse direction of the bridge is d n The angle is the angle between the tangent of the plane of the main cable (6) at the intersection of the left and right ends of the rigid suspender (8) and the transverse direction of the bridge. The single rigid hanger (8) adopts a steel box structure, which is composed of an upper sealing plate (17), a rigid hanger bolt hole (18), a lower sealing plate (19), a transverse partition plate (20), an inner edge plate (21), an outer edge plate (22), a web plate (23), and a vertical partition plate (24). The inner edge plate (21) and the outer edge plate (22) are respectively fixed on the front and back sides of the upper sealing plate (17), the lower sealing plate (19) and the web plate (23). The transverse partition plate (20) is arranged on the outer side walls of the inner edge plate (21) and the outer edge plate (22). The vertical partition plate (24) is fixedly installed between the two web plates (23). The rigid hanger bolt hole (18) is correspondingly arranged on the inner edge plate (21) and the vertical partition plate (24).

5. A double-pylon space cable rigid boom suspension bridge structure according to claim 1, characterized in that, The top chord (9) is a steel box structure, the top of the top chord (9) is provided with an inspection hole (25), the front and back panels of the top chord (9) are provided with main cable notches (26), and the distance Li between the two main cable notches (26) is the distance between the two main cables (6) at the anchorage point position.

6. A double-pylon space cable rigid boom suspension bridge structure according to claim 1, characterized in that, The cable clamp (16) is composed of an upper cable clamp (27), a lower cable clamp (28), a cable clamp bolt (29), and an upper chord cable permanent lifting lug (30). The lower cable clamp (28) is located below the upper cable clamp (27), and the lower cable clamp (28) and the upper cable clamp (27) are fixedly connected through the cable clamp bolt (29). The upper cable clamp (27) is provided with two inner and outer ear plates, and the lower cable clamp (28) is provided with one ear plate. The upper cable clamp (27) and the lower cable clamp (28) are provided with cable clamp ear plate bolt reserved holes (31) on the upper part of the ear plates. The lower cable clamp (28) is provided with a vertical temporary lifting rod reserved bolt hole (32) on the lower part of the ear plate. The upper cable clamp (27) is provided with an upper chord cable permanent lifting lug (30) on the inner side of the ear plate.

7. A double-pylon space cable rigid boom suspension bridge structure according to claim 1, characterized in that, The top of the rigid lifting rod (8) is connected with the main cable (6) through the cable clamp (16). The cable clamp ear plate bolt reserved holes (31) of the two ear plates of the upper cable clamp (27) are connected with the vertical partition plates (24) of the two rigid lifting rods (8) through high-strength bolts, respectively. The cable clamp ear plate bolt reserved holes (31) on the upper part of the ear plate of the lower cable clamp (28) are connected with the inner edge plates (21) of the two rigid lifting rods (8). The vertical temporary lifting rod reserved bolt hole (32) on the lower part of the ear plate of the lower cable clamp (28) is connected with the vertical temporary lifting rod (33).

8. A double-pylon space cable rigid boom suspension bridge structure according to claim 1, characterized in that, The main beam (7) is composed of a steel box beam (34), a cantilever arm (35), and a cantilever arm ear plate (36). The main beam (7) of the side span part has no cantilever arm (35). The width of the steel box beam (34) is (L1-a). The outer edge of the steel box beam (34) of the middle span part is in a parabolic form. The width of the steel box beam (34) gradually decreases in the direction of the span center. The width of the steel box beam (34) at the position of the span center is (L2-b). The anchor point position of the main beam (7) of the middle span part is provided with the cantilever arm (35) on the outer side of the steel box beam (34). The cantilever arm (35) is provided with the cantilever arm ear plate (36). The cantilever arm ear plate (36) is connected with the lower end inner edge plate (21) and the vertical partition plate (24) of the rigid lifting rod (8) through bolting and welding.

9. A construction method of a double-tower spatial cable rigid lifting rod suspension bridge structure, comprising the following steps: Step one: constructing the tower column pile foundation (1) and the bearing platform (2), the anchorage pile foundation (10) and the anchorage (11), the main beam pile foundation (12) and the main beam cushion stone (13), the main beam support (14), installing the floating crane (41), and constructing the temporary support pier (42). Step two: installing the main beam (7) segment by using the floating crane (41) and completing the welding connection between the segments. Step three: installing the tower column (3), the cable saddle (4), and the tower column cross beam (5) by using the floating crane (41). Step four: installing the main cable (6) and tensioning to the designed tensioning force, installing and positioning the cable clamp (16). Step five: installing the upper chord cable (15) and the vertical temporary lifting rod (33) of the main cable (6), tensioning or fastening the upper chord cable (15) and the vertical temporary lifting rod (33), and adjusting the main cable shape to the bridge shape. Step six: the rigid boom (8) is installed from the middle to both sides by the floating crane (41), and the rigid boom (8) is temporarily pinned and fixed with the cable clamp (16) and the cantilever ear plate (36), after the installation of the rigid boom (8) is completed, the high-strength bolts are used to replace the punch pins and are screwed in place. Step seven: the upper chord (9) is lifted by the floating crane (41), and is installed in place from top to bottom, is clamped into the main cable (6), and is placed on the rigid boom (8), after the measurement and positioning, is welded and fixed with the rigid boom (8). Step eight: after the vertical temporary boom (33) is removed, the temporary support pier (42) is removed, and the bridge deck system and other auxiliary structure construction are carried out.

10. The method of constructing a double-pylon space cable rigid boom suspension bridge structure according to claim 11, wherein: In step six, when the rigid boom (8) is installed, the upper end is installed first and then the lower end, the floating crane (41) is used to insert the rigid boom (8) into the ear plate of the cable clamp (16), then the rigid boom (8) is lifted upwards, the lower end of the rigid boom (8) is inserted into the cantilever ear plate (36), then the holes are aligned, and the punch pins are installed one by one, in the hole alignment process, the position of the ear plate of the cable clamp (16) is adjusted by cooperating with the tensioning and loosening of the current position vertical temporary boom (33) by the floating crane (41), so as to facilitate the bolt hole alignment installation.

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