Cable bridge

Abstract

The invention relates to a cable bridge which comprises n splicing sections with the axis being a straight line, n is an odd number larger than 1, the tail end of the mth splicing section is connected with the head end of the (m + 1) th splicing section to form a symmetrical polygonal broken line arch, the axis of the (n + 1) / 2th splicing section is horizontally arranged, m is an integer larger than or equal to 1 and smaller than n, and n is an integer larger than or equal to 1 and smaller than n. The head end of the first splicing section and the tail end of the nth splicing section are connected to the two sides of a river channel, and the centers of the head ends and the centers of the tail ends of the splicing sections are located on the same parabola. The splicing section comprises a space truss structure with a hollow space, a plurality of cable supports arranged in the hollow space, a roof enclosure structure arranged above the space truss structure and a bottom plate arranged at the bottom of the hollow space, and a space above the bottom of the hollow space and between the cable supports forms an activity space for people to pass through. The deformation is reasonably limited, the economical efficiency can be improved, and the applicable span is expanded.

Description

Technical Field

[0001] The invention relates to the technical field of cable channel construction, and in particular to a cable bridge used in a cable river crossing project. Background Art

[0002] When urban power cable channels encounter rivers, they often use spanning cable bridges, underwater cables, or trenchless methods to pass through the foundation below the river. When cable bridges are used, the following are currently used: Figure 1 The rectangular truss form shown or as shown in the attached Figure 2 The rectangular truss plus arch structure shown in the figure. The common feature of these two types of bridges is that only the spatial position of several cable protection tubes is considered on the bridge, and the bridge does not have the conditions for personnel passage, maintenance or emergency repair. The load borne by the bridge structure is relatively simple, mainly the self-weight of the bridge structure, the cable protection tube and the self-weight of the cable, etc. At the same time, it is subject to the requirements of cable bridge deformation control (steel should not be greater than 1 / 200), the width of the river spanned by the bridge is limited, and when crossing a large river, it is subject to deformation control, and the specifications of the bridge structure are greatly increased.

[0003] In order to solve the above problems of existing cable trays, the following solutions have emerged: 1. The utility model patent with application number 201320483748.2 and titled "A New Type of Large-span Cable Bridge" discloses a rectangular cross-section bridge structure that uses steel pipes to replace the main load-bearing angle steel. The cross-section of the cross-frame that crosses the river can still use a rectangular truss structure. Although the main material uses steel pipes to replace angle steels to increase the bending modulus, reduce the deflection of the bridge, and increase the span of the bridge, the bridge still only contains cable protection tubes, and personnel are not allowed to lay cables or repair them; 2. The solution disclosed in the utility model patent with application number 201821480758.X and titled "Long-span Arched High-voltage Power Cable Bridge" has solved the problems of excessive mid-span deformation and insufficient height for traffic under the bridge in long-span rivers to a certain extent, but the bridge still does not meet the conditions for personnel passage and lacks protection for cables; 3. The invention patent with application number 201610153332.2 and titled "A Cable Conduit Bridge Structure" discloses a scheme including a bridge pier in a river and a cable bridge across the river, wherein an arched steel frame is installed on the bridge pier, the cable bridge passes through the arched steel frame, the arched steel frame is fixed to the cable bridge by inclined ropes, and a conduit clamp for fixing the cable conduit is provided on the cable bridge. Although this scheme can ensure that the cable conduit is fixed reliably and neatly in the bridge, it also has the defect of not meeting the conditions for personnel to pass.

[0004] In summary, the existing various types of cable trays generally have the following problems: the load borne by the tray is small, only the spatial position of the cable and its protective tube is considered, the cable laying and the passage required for personnel inspection and emergency repair are not considered, the span is limited, and the economy is poor when the span is large. Summary of the invention

[0005] The purpose of the present invention is to provide a cable bridge which can enlarge the span, improve the economic efficiency and facilitate the construction, operation and maintenance.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: A cable bridge is used in a cable crossing project to lay cables on a river channel, the cable bridge comprises n assembly segments whose axes are straight lines, n is an odd number greater than 1, the end of the assembly segment of the mth segment is connected to the head end of the assembly segment of the m+1th segment to form a symmetrical polygonal arch, the axis of the assembly segment of the (n+1) / 2th segment is horizontally arranged, m is an integer greater than or equal to 1 and less than n, the head end of the assembly segment of the first segment and the end of the assembly segment of the nth segment are connected to both sides of the river channel, and the centers of the head end and the end of each assembly segment are located on the same parabola; The assembly section includes a space truss structure with a hollow space, a plurality of cable racks arranged in the hollow space, a roof enclosure structure arranged above the space truss structure, and a base plate arranged at the bottom of the hollow space. The space above the bottom of the hollow space and between the cable racks forms an activity space for people to pass through.

[0007] The space truss structure comprises a main force unit, a bottom unit, a top unit, a left side unit and a right side unit; The main force-bearing unit includes two sections of lower chord main force-bearing tubes and two sections of upper chord main force-bearing tubes. The axes of the lower chord main force-bearing tubes and the upper chord main force-bearing tubes are arranged along the axis direction of the assembly section. The two sections of the lower chord main force-bearing tubes are distributed in the left and right directions, and the two sections of the upper chord main force-bearing tubes are distributed in the left and right directions. The two sections of the upper chord main force-bearing tubes are arranged one by one above the two sections of the lower chord main force-bearing tubes. The bottom unit is arranged between two sections of the main force-bearing tubes of the lower chord; the bottom unit comprises a plurality of bottom vertical rods arranged along the axis direction perpendicular to the assembly section, and a plurality of bottom oblique rods arranged along the axis direction inclined to the assembly section, and the two ends of the bottom vertical rods are respectively connected to the two sections of the main force-bearing tubes of the lower chord, and each section of the bottom oblique rods is respectively arranged between two adjacent sections of the bottom vertical rods, and the two ends of the bottom oblique rods are respectively connected to the two sections of the main force-bearing tubes of the lower chord; The top unit is arranged between two sections of the upper chord main force-bearing tubes; the top unit comprises a plurality of top vertical rods arranged along the axis direction perpendicular to the assembly section, and a plurality of top diagonal rods arranged along the axis direction inclined to the assembly section, the two ends of the top vertical rods are respectively connected to the two sections of the upper chord main force-bearing tubes, each section of the top diagonal rods is respectively arranged between two adjacent sections of the top vertical rods, and the two ends of the top diagonal rods are respectively connected to the two sections of the upper chord main force-bearing tubes; The left side unit is arranged between the upper chord main force-bearing tube and the lower chord main force-bearing tube on the left side; the left side unit includes multiple sections of left side vertical rods arranged along the axial direction perpendicular to the assembly section, and multiple sections of left side oblique rods arranged along the axial direction inclined to the assembly section, and the two ends of the left side vertical rods are respectively connected to the upper chord main force-bearing tube and the lower chord main force-bearing tube on the left side, and each section of the left side oblique rod is respectively arranged between two adjacent sections of the left side vertical rods, and the two ends of the left side oblique rod are respectively connected to the upper chord main force-bearing tube and the lower chord main force-bearing tube on the left side; The right side unit is arranged between the upper chord main load-bearing tube and the lower chord main load-bearing tube on the right side; the right side unit includes multiple sections of right side vertical rods arranged along the axial direction perpendicular to the assembly section, and multiple sections of right side diagonal rods arranged along the axial direction inclined to the assembly section, and the two ends of the right side vertical rods are respectively connected to the upper chord main load-bearing tube and the lower chord main load-bearing tube on the right side, and each section of the right side diagonal rod is respectively arranged between two adjacent sections of the right side vertical rods, and the two ends of the right side diagonal rod are respectively connected to the upper chord main load-bearing tube and the lower chord main load-bearing tube on the right side.

[0008] The bottom vertical rod, the top vertical rod, the left vertical rod, and the right vertical rod are arranged in one-to-one correspondence to form multiple groups of frames; the spatial truss structure also includes multiple groups of lateral limit assemblies arranged in one-to-one correspondence with each group of the frames; the lateral limit assemblies include four sections of oblique support rods, the two ends of the oblique support rods in the first section are respectively connected to the left vertical rod and the top vertical rod, the two ends of the oblique support rods in the second section are respectively connected to the top vertical rod and the right vertical rod, the two ends of the oblique support rods in the third section are respectively connected to the right vertical rod and the bottom vertical rod, and the two ends of the oblique support rods in the fourth section are respectively connected to the bottom vertical rod and the left vertical rod.

[0009] Node plates are used to connect the bottom vertical rod and the main load-bearing tube of the lower chord, the bottom oblique rod and the main load-bearing tube of the lower chord, the top vertical rod and the main load-bearing tube of the upper chord, the top oblique rod and the main load-bearing tube of the upper chord, the left vertical rod and the main load-bearing tube of the lower chord on the left, the left vertical rod and the main load-bearing tube of the upper chord on the left, the left oblique rod and the main load-bearing tube of the lower chord on the left, the left oblique rod and the main load-bearing tube of the upper chord on the left, the right vertical rod and the main load-bearing tube of the lower chord on the right, the right vertical rod and the main load-bearing tube of the upper chord on the right, the right oblique rod and the main load-bearing tube of the lower chord on the right, and the right oblique rod and the main load-bearing tube of the upper chord on the right.

[0010] A side protection structure is respectively provided on the left side of the left side unit and the right side of the right side unit.

[0011] The cable support comprises a plurality of horizontally arranged cantilevers, one end of each cantilever being connected to the left side vertical rod and / or the right side vertical rod.

[0012] The roof enclosure structure includes a plurality of sections of slope-adjusting full-length support rods extending along the axial direction of the space truss structure and installed on the top vertical rods, a plurality of sections of purlins arranged along the axial direction perpendicular to the assembly section and installed on the slope-adjusting full-length support rods, and a roof panel installed on the purlins and shielding the space truss structure from above.

[0013] The bottom plate includes a grid plate disposed on the bottom vertical rod.

[0014] The length of each assembly section is less than or equal to 12m.

[0015] Bridge foundations are respectively arranged on both sides of the river channel, and the head end of the first section of the assembly segment and the end of the nth section of the assembly segment are respectively hinged to the bridge foundations on both sides of the river channel.

[0016] Due to the application of the above technical scheme, the present invention has the following advantages compared with the prior art: the cable tray of the present invention changes the stress state through multi-fold line arching, thereby reasonably limiting the deformation amount, which can improve the economy and expand the applicable span; the cable tray of the present invention is convenient for personnel to pass through during construction and operation and maintenance periods by setting up pedestrian passages. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 Schematic diagram of an existing rectangular truss cable tray.

[0018] Attached Figure 2 Schematic diagram of a cable tray with an arched structure added to an existing rectangular truss.

[0019] Attached Figure 3 It is a schematic structural diagram of the cable bridge of the present invention.

[0020] Attached Figure 4 It is a front view schematic diagram of the space truss structure in the cable bridge of the present invention.

[0021] Attached Figure 5 It is a top view schematic diagram of the space truss structure in the cable bridge of the present invention.

[0022] Attached Figure 6 It is a bottom view schematic diagram of the space truss structure in the cable bridge of the present invention.

[0023] Attached Figure 7 It is a cross-sectional schematic diagram of the space truss structure in the cable bridge of the present invention.

[0024] Attached Figure 8 It is a schematic diagram of construction process 1 of the cable bridge of the present invention.

[0025] Attached Fig. 9 It is a schematic diagram of the second construction process of the cable bridge of the present invention.

[0026] Attached Fig.10 It is a schematic diagram of construction process three of the cable bridge of the present invention.

[0027] Attached Fig.11 It is a schematic diagram of construction process four of the cable bridge of the present invention.

[0028] Attached Fig.12 It is a schematic diagram of construction process five of the cable bridge of the present invention.

[0029] In the above drawings: 1. Assembling section; 2. Space truss structure; 3. Cable support; 4. Roof enclosure structure; 5. Lower chord main load-bearing tube; 6. Upper chord main load-bearing tube; 7. Bottom vertical rod; 8. Bottom diagonal rod; 9. Top vertical rod; 10. Top diagonal rod; 11. Left vertical rod; 12. Left diagonal rod; 13. Right vertical rod; 14. Right diagonal rod; 15. Slope-leveling full-length support rod; 16. Purlin and roof panel; 17. Diagonal support rod; 18. Bottom plate; 19. Bridge foundation; 20. Cable trench or cable tunnel. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0031] Embodiment 1: As shown in the attached Figure 3 To Attachment Figure 7As shown, a cable bridge used in a cable crossing project to lay cables on a river includes n (n is an odd number greater than 1, such as 3, 5, 7...) assembly segments 1, and the axis of each assembly segment 1 is a straight line. The end of the mth (m is an integer greater than or equal to 1 and less than n) assembly segment 1 is connected to the head end of the m+1th assembly segment 1 to form a symmetrical polygonal arch, the head end of the first assembly segment 1 and the end of the nth assembly segment 1 are connected to both sides of the river, wherein the axis of the (n+1) / 2th assembly segment 1 is arranged horizontally. After assembly, the centers of the head end and the end of each assembly segment 1 are located on the same parabola. In this scheme, according to the span and arch height required by the cable bridge, combined with the parabola line shape and the boundary conditions required by the cable bridge, the value of n is determined, so that the parabola is divided into n curves and the curves divided by the parabola are replaced by n assembly segments 1. In this embodiment, taking n=5 as an example, the third assembly segment 1 is an assembly segment 1 with its axis horizontally arranged.

[0032] Each assembly section 1 includes a space truss structure 2, a plurality of cable supports 3, a roof enclosure structure 4 and a bottom plate 18. The length of each assembly section 1 is less than or equal to 12 m, meeting the transportation requirements.

[0033] The space truss structure 2 has a hollow space that runs through along its axis. The space truss structure 2 includes a main force unit, a bottom unit, a top unit, a left side unit and a right side unit. The main force unit includes two sections of lower chord main force tubes 5 and two sections of upper chord main force tubes 6. The lower chord main force tubes 5 and the upper chord main force tubes 6 are usually cylindrical steel pipes. The axes of the lower chord main force tubes 5 and the upper chord main force tubes 6 are arranged along the axis direction of the assembly section 1. The four directions on the plane perpendicular to the axis of the assembly section 1 are defined as up, down, left and right, respectively. The two sections of the lower chord main force tubes 5 are distributed in the left and right directions, and the two sections of the upper chord main force tubes 6 are distributed in the left and right directions, and the two sections of the upper chord main force tubes 6 are arranged one by one above the two sections of the lower chord main force tubes 5, that is, the lower chord main force tubes 5 and the upper chord main force tubes 6 are respectively located at the four corners of a rectangle / square. The bottom unit is arranged between the two sections of the lower chord main force tubes 5. The bottom unit includes multiple sections of bottom vertical rods 7 and multiple sections of bottom diagonal rods 8. The axis of the bottom vertical rod 7 is arranged along the axis direction of the vertical assembly section 1, and the two ends of the bottom vertical rod 7 are respectively connected to the two sections of the lower chord main load-bearing tube 5. The axis of the bottom diagonal rod 8 is arranged along the axis direction inclined to the assembly section 1, and the two ends of the bottom diagonal rod 8 are respectively connected to the two sections of the lower chord main load-bearing tube 5. Each section of the bottom vertical rod 7 is arranged along the axis direction of the lower chord main load-bearing tube 5, and a gap is formed between two adjacent sections of the bottom vertical rod 7, and each section of the bottom diagonal rod 8 is respectively arranged between two adjacent sections of the bottom vertical rod 7. The top unit is arranged between two sections of the upper chord main load-bearing tube 6. The top unit includes multiple sections of top vertical rods 9 and multiple sections of top diagonal rods 10. The axis of the top vertical rod 9 is arranged along the axis direction of the vertical assembly section 1, and the two ends of the top vertical rod 9 are respectively connected to the two sections of the upper chord main load-bearing tube 6. The axis of the top diagonal rod 10 is arranged along the axis direction inclined to the assembly section 1, and the two ends of the top diagonal rod 10 are respectively connected to the two sections of the upper chord main load-bearing tube 6. Each section of the top vertical rod 9 is arranged along the axis direction of the upper chord main load-bearing tube 6, and a gap is formed between two adjacent sections of the top vertical rod 9, and each section of the top diagonal rod 10 is respectively arranged between each two adjacent sections of the top vertical rod 9. The left side unit is arranged between the upper chord main load-bearing tube 6 and the lower chord main load-bearing tube 5 on the left. The left side unit includes multiple sections of left side vertical rods 11 and multiple sections of left side diagonal rods 12. The axis of the left side vertical rod 11 is arranged along the axis direction perpendicular to the assembly section 1, and the two ends of the left side vertical rod 11 are respectively connected to the upper chord main load-bearing tube 6 and the lower chord main load-bearing tube 5 on the left. The axis of the left side oblique rod 12 is arranged along the axis direction inclined to the assembly section 1, and the two ends of the left side oblique rod 12 are respectively connected to the upper chord main force-bearing tube 6 and the lower chord main force-bearing tube 5 on the left side. Each section of the left side vertical rod 11 is arranged along the axis direction of the assembly section 1 to form a gap between two adjacent sections of the left side vertical rod 11, and each section of the left side oblique rod 12 is respectively arranged between two adjacent sections of the left side vertical rod 11. The right side unit is arranged between the upper chord main force-bearing tube 6 and the lower chord main force-bearing tube 5 on the right side. The right side unit includes multiple sections of right side vertical rods 14 and multiple sections of right side oblique rods 15.The axis of the right side vertical rod 14 is arranged along the axis direction perpendicular to the assembly section 1, and the two ends of the right side vertical rod 14 are respectively connected to the upper chord main force-bearing tube 6 and the lower chord main force-bearing tube 5 on the right side. The axis of the right side diagonal rod 15 is arranged along the axis direction inclined to the assembly section 1, and the two ends of the right side diagonal rod 15 are respectively connected to the upper chord main force-bearing tube 6 and the lower chord main force-bearing tube 5 on the right side. Each section of the right side vertical rod 14 is arranged along the axis direction of the assembly section 1 to form a gap between two adjacent sections of the right side vertical rod 14, and each section of the right side diagonal rod 15 is respectively arranged between two adjacent sections of the right side vertical rod 14. The bottom diagonal rod 8, the top diagonal rod 10, the left side diagonal rod 12, and the right side diagonal rod 15 in the above scheme can be either independent rods or cross rods. The bottom vertical rod 7, the top vertical rod 9, the left vertical rod 11, and the right vertical rod 14 are arranged at the same position on the axis of the assembly section 1, that is, the bottom vertical rod 7, the top vertical rod 9, the left vertical rod 11, and the right vertical rod 14 are arranged one by one to form multiple groups of frames. The bottom diagonal rod 8, the top diagonal rod 10, the left diagonal rod 12, and the right diagonal rod are respectively located on the outside of the frame formed by the bottom vertical rod 7, the top vertical rod 9, the left vertical rod 11, and the right vertical rod 14. In addition, the spatial truss structure 2 also includes multiple groups of lateral limiter components, and each group of lateral limiter components is arranged one by one to each group of frames. Each set of transverse limiting components includes four sections of oblique support rods 1715, the two ends of the first section of the oblique support rod 1715 are respectively connected to the left side vertical rod 11 and the top vertical rod 9, the two ends of the second section of the oblique support rod 1715 are respectively connected to the top vertical rod 9 and the right side vertical rod 14, the two ends of the third section of the oblique support rod 1715 are respectively connected to the right side vertical rod 14 and the bottom vertical rod 7, and the two ends of the fourth section of the oblique support rod 1715 are respectively connected to the bottom vertical rod 7 and the left side vertical rod 11. The angle between each section of the oblique support rod 1715 and the vertical rod to which it is connected is usually 45°. The bottom vertical rod 7, the top vertical rod 9, the left side vertical rod 11, and the right side vertical rod 14 cooperate with the four sections of the oblique support rods 1715, which are used to strengthen the transverse rectangular cross section and can form a closed rigid frame, which is a transverse wind-resistant structure and a limited deformation structure, which transmits horizontal wind loads and plays a role in limiting horizontal deformation.

[0034] Node plates are used to connect the bottom vertical rod 7 and the lower chord main load-bearing tube 5, the bottom oblique rod 8 and the lower chord main load-bearing tube 5, the top vertical rod 9 and the upper chord main load-bearing tube 6, the top oblique rod 10 and the upper chord main load-bearing tube 6, the left side vertical rod 11 and the lower chord main load-bearing tube 5 on the left, the left side vertical rod 11 and the upper chord main load-bearing tube 6 on the left, the left side oblique rod 12 and the lower chord main load-bearing tube 5 on the left, the left side oblique rod 12 and the upper chord main load-bearing tube 6 on the left, the right side vertical rod 14 and the lower chord main load-bearing tube 5 on the right, the right side vertical rod 14 and the upper chord main load-bearing tube 6 on the right, the right side oblique rod 15 and the lower chord main load-bearing tube 5 on the right, and the right side oblique rod 15 and the upper chord main load-bearing tube 6 on the right.

[0035] The cable holder 3 is arranged in the hollow space formed by the space truss structure 2. The cable holder 3 includes a plurality of horizontally arranged cantilevers, one end of each of which is connected to the left side vertical rod 11 and / or the right side vertical rod 14, and the other end of each cantilever extends toward the center of the hollow space, and the axial direction of the cantilever is perpendicular to the axial direction of the assembly section 1. The cable is mounted on the cable holder 3 along the axial direction of the assembly section 1. The bottom plate 18 is arranged at the bottom of the hollow space, and the bottom plate 18 includes a grating plate arranged on the bottom vertical rod 7, and the bottom plate 18 is fully extended along the axial direction of the assembly section 1. The space above the bottom of the hollow space, that is, above the bottom plate 18, and the space between the cable holder 3 form an activity space for people to pass through, so as to meet the needs of people passing through.

[0036] The roof enclosure structure 4 is arranged above the space truss structure 2 and outside the space truss structure 2. The roof enclosure structure 4 includes a plurality of full-length slope-adjusting support rods 15, a plurality of purlins and a roof panel 16. The axis of the full-length slope-adjusting support rod 15 extends along the axis direction of the space truss structure 2, and it is installed on the top vertical rod 9, and H-shaped steel can be used. The purlin is installed on the full-length slope-adjusting support rod 15, and the axis direction of the purlin is arranged along the axis direction of the vertical assembly section 1. The roof panel 16 is installed on each purlin to shield the space truss structure 2 from above.

[0037] In addition, side protection structures are provided on the left side of the left side unit and the right side of the right side unit. The side protection structures can be made of strip metal plates (such as aluminum alloy plates, stainless steel plates, etc.) or blinds to meet the needs of cable sunshade and rain protection and prevent the cable from being stolen.

[0038] Bridge foundations 19 are respectively arranged on both sides of the river channel, and the head end of the first assembly section 1 and the end of the nth assembly section 1 are respectively hinged to the bridge foundations 19 on both sides of the river channel, thereby realizing connection with structures such as cable trenches or cable tunnels 20. The bridge foundations 19 are cast-in-place piles, which are convenient for controlling deformation.

[0039] In the above-mentioned cable bridge, the height of each assembly section 1 relative to the lowest point of the bridge is determined through structural calculation and considering the navigation requirements under the cable bridge. During the design, the span of the cable bridge and the required arch height in the middle are first determined, and then divided into several sections according to the parabola shape, combined with boundary conditions such as lifting, transportation, and weight, and the arc of the parabola is replaced by a broken line of odd segments, so as to obtain the design scheme of each assembly section 1. Due to the use of a spatial truss structure 2 composed of polygonal broken lines, the vertical deformation is significantly reduced, and its vertical deformation is mainly caused by the assembly section 1 set horizontally in the middle. Under the premise that the length of a single assembly section 1 does not exceed 12m, the deformation is much less than 1 / 200 of the total span, which meets the requirements of existing regulations, and there is no need to increase the specifications of the main materials, so that the vertical deformation of the bridge does not control its structural design, and the specifications of the main steel pipe can be reasonably reduced, which is economical.

[0040] The above-mentioned cable bridge is a polygonal axis large-span river-type steel pipe structure cable bridge, which can meet the requirements of cable laying, maintenance and safety protection. It is suitable for cable crossing projects connected to channels on both sides, especially for high-voltage power cable crossing projects connected to tunnels.

[0041] As attached Figure 8 To Attachment Fig.12 As shown, before the cable tray is assembled, each assembly section 1 is prefabricated in the factory and transported to the site after hot-dip galvanizing for corrosion protection. During the assembly, it can be hoisted and bolted on site. Taking the five-section assembly section 1 as an example, the main installation steps include the following: Step 1: Complete the construction of the bridge foundation 19, i.e., the anchor bolts; Step 2: hoist two assembly sections 1 from opposite sides of the river channel and install them in place; Step 3: Lift two sections of assembly 1 from opposite sides of the river for installation Step 4: hoist the central horizontally arranged assembly segment 1 for installation. At this point, the installation of the spatial truss structure 2 is completed; Step 5: Construction of cable trenches on both sides of the river; Step 6: Install the grid plates at the bottom of the space truss structure 2 from both ends toward the center of the river channel; Step 7: Install the slope-leveling full-length support rods 15, purlins, roof panels 16, etc.; Step 8: Install the side protection structure; Step 9: Install the cable bracket 3; Step 10: Laying the cables.

[0042] Compared with the existing cable tray, the cable tray of the present invention has the following beneficial effects: 1. Several layers of cable supports 3 are set in the large-span bridge to facilitate the serpentine laying of cables and meet the needs of cable projects that need to use serpentine laying to cross the river; 2. A pedestrian passage is set up inside the bridge frame to facilitate the passage of personnel during construction and operation and maintenance; 3. Sunshade roofs and side protection shutters are set up to improve the maintenance conditions for personnel in the channel and the cable laying and operation conditions; 4. The bridge structure is arched by using multi-fold curves, which changes the stress state of the lower chord of the truss, and reasonably limits the deformation of the bridge at the mid-span. It is not only economical, but also expands the use conditions of the bridge structure, especially in the structural engineering of mid-span deflection control; 5. Four oblique support rods 1715 are arranged between the vertical rods of the top, bottom and two side wall trusses to form a number of rigid frames in the lateral direction, which effectively controls the deformation of the long-span bridge caused by the horizontal wind load.

[0043] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A cable bridge, used in cable crossing projects to lay cables on a river, characterized by: The cable bridge comprises n assembly segments with straight axis lines, n is an odd number greater than 1, the end of the assembly segment of the mth segment is connected to the head end of the assembly segment of the m+1th segment to form a symmetrical polygonal arch, the axis of the assembly segment of the (n+1) / 2th segment is horizontally arranged, m is an integer greater than or equal to 1 and less than n, the head end of the assembly segment of the first segment and the end of the assembly segment of the nth segment are connected to both sides of the river channel, and the centers of the head end and the end of each assembly segment are located on the same parabola; The assembly section includes a space truss structure with a hollow space, a plurality of cable racks arranged in the hollow space, a roof enclosure structure arranged above the space truss structure, and a base plate arranged at the bottom of the hollow space. The space above the bottom of the hollow space and between the cable racks forms an activity space for people to pass through.

2. A cable tray according to claim 1, characterized in that: The space truss structure comprises a main force unit, a bottom unit, a top unit, a left side unit and a right side unit; The main force-bearing unit includes two sections of lower chord main force-bearing tubes and two sections of upper chord main force-bearing tubes. The axes of the lower chord main force-bearing tubes and the upper chord main force-bearing tubes are arranged along the axis direction of the assembly section. The two sections of the lower chord main force-bearing tubes are distributed in the left and right directions, and the two sections of the upper chord main force-bearing tubes are distributed in the left and right directions. The two sections of the upper chord main force-bearing tubes are arranged one by one above the two sections of the lower chord main force-bearing tubes. The bottom unit is arranged between two sections of the main force-bearing tubes of the lower chord; the bottom unit comprises a plurality of bottom vertical rods arranged along the axis direction perpendicular to the assembly section, and a plurality of bottom oblique rods arranged along the axis direction inclined to the assembly section, and the two ends of the bottom vertical rods are respectively connected to the two sections of the main force-bearing tubes of the lower chord, and each section of the bottom oblique rods is respectively arranged between two adjacent sections of the bottom vertical rods, and the two ends of the bottom oblique rods are respectively connected to the two sections of the main force-bearing tubes of the lower chord; The top unit is arranged between two sections of the upper chord main force-bearing tubes; the top unit comprises a plurality of top vertical rods arranged along the axis direction perpendicular to the assembly section, and a plurality of top diagonal rods arranged along the axis direction inclined to the assembly section, the two ends of the top vertical rods are respectively connected to the two sections of the upper chord main force-bearing tubes, each section of the top diagonal rods is respectively arranged between two adjacent sections of the top vertical rods, and the two ends of the top diagonal rods are respectively connected to the two sections of the upper chord main force-bearing tubes; The left side unit is arranged between the upper chord main force-bearing tube and the lower chord main force-bearing tube on the left side; the left side unit includes multiple sections of left side vertical rods arranged along the axial direction perpendicular to the assembly section, and multiple sections of left side oblique rods arranged along the axial direction inclined to the assembly section, and the two ends of the left side vertical rods are respectively connected to the upper chord main force-bearing tube and the lower chord main force-bearing tube on the left side, and each section of the left side oblique rod is respectively arranged between two adjacent sections of the left side vertical rods, and the two ends of the left side oblique rod are respectively connected to the upper chord main force-bearing tube and the lower chord main force-bearing tube on the left side; The right side unit is arranged between the upper chord main load-bearing tube and the lower chord main load-bearing tube on the right side; the right side unit includes multiple sections of right side vertical rods arranged along the axial direction perpendicular to the assembly section, and multiple sections of right side diagonal rods arranged along the axial direction inclined to the assembly section, and the two ends of the right side vertical rods are respectively connected to the upper chord main load-bearing tube and the lower chord main load-bearing tube on the right side, and each section of the right side diagonal rod is respectively arranged between two adjacent sections of the right side vertical rods, and the two ends of the right side diagonal rod are respectively connected to the upper chord main load-bearing tube and the lower chord main load-bearing tube on the right side.

3. A cable tray according to claim 2, characterized in that: The bottom vertical rod, the top vertical rod, the left vertical rod, and the right vertical rod are arranged in one-to-one correspondence to form multiple groups of frames; the spatial truss structure also includes multiple groups of lateral limit assemblies arranged in one-to-one correspondence with each group of the frames; the lateral limit assemblies include four sections of oblique support rods, the two ends of the oblique support rods in the first section are respectively connected to the left vertical rod and the top vertical rod, the two ends of the oblique support rods in the second section are respectively connected to the top vertical rod and the right vertical rod, the two ends of the oblique support rods in the third section are respectively connected to the right vertical rod and the bottom vertical rod, and the two ends of the oblique support rods in the fourth section are respectively connected to the bottom vertical rod and the left vertical rod.

4. A cable tray according to claim 2, characterized in that: Node plates are used to connect the bottom vertical rod and the main load-bearing tube of the lower chord, the bottom oblique rod and the main load-bearing tube of the lower chord, the top vertical rod and the main load-bearing tube of the upper chord, the top oblique rod and the main load-bearing tube of the upper chord, the left vertical rod and the main load-bearing tube of the lower chord on the left, the left vertical rod and the main load-bearing tube of the upper chord on the left, the left oblique rod and the main load-bearing tube of the lower chord on the left, the left oblique rod and the main load-bearing tube of the upper chord on the left, the right vertical rod and the main load-bearing tube of the lower chord on the right, the right vertical rod and the main load-bearing tube of the upper chord on the right, the right oblique rod and the main load-bearing tube of the lower chord on the right, and the right oblique rod and the main load-bearing tube of the upper chord on the right.

5. A cable tray according to claim 2, characterized in that: A side protection structure is respectively provided on the left side of the left side unit and the right side of the right side unit.

6. A cable tray according to claim 2, characterized in that: The cable support comprises a plurality of horizontally arranged cantilevers, one end of each cantilever being connected to the left side vertical rod and / or the right side vertical rod.

7. A cable tray according to claim 2, characterized in that: The roof enclosure structure includes a plurality of sections of slope-adjusting full-length support rods extending along the axial direction of the space truss structure and installed on the top vertical rods, a plurality of sections of purlins arranged along the axial direction perpendicular to the assembly section and installed on the slope-adjusting full-length support rods, and a roof panel installed on the purlins and shielding the space truss structure from above.

8. A cable tray according to claim 2, characterized in that: The bottom plate includes a grid plate disposed on the bottom vertical rod.

9. A cable tray according to any one of claims 1 to 8, characterized in that: The length of each assembly section is less than or equal to 12m.

10. The cable tray according to claim 1, characterized in that: Bridge foundations are respectively arranged on both sides of the river channel, and the head end of the first section of the assembly segment and the end of the nth section of the assembly segment are respectively hinged to the bridge foundations on both sides of the river channel.

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