Rotary main cable suspension bridge applied to karst cave terrain

Abstract

A rotary main cable suspension bridge applied to a karst cave terrain comprises a plurality of rotary cable saddles, a main cable, an annular rotary anchor, a pre-buried bottom plate, a main tower and a conventional anchor. The bottom of each rotary cable saddle is connected with the top of the saddle body bottom plate, the bottom of the saddle body bottom plate is connected with the top of the pre-embedded bottom plate, the pre-embedded bottom plate is embedded in the rotary anchorage, a plurality of saddle grooves used for containing main cables are formed in the tops of the rotary cable saddles, and the main cables are arranged in the saddle grooves; all the rotary cable saddles are uniformly and annularly distributed on the top arc surface of the rotary anchorage, and every two adjacent rotary cable saddles are fixed through high-strength bolts; the annular rotary anchorage and the conventional anchor are arranged on the two sides of a river bank respectively, one end of the main cable passes through the main tower and then is connected with the rotary cable saddles, the main cable is annularly arranged in saddle grooves of all the rotary cable saddles along the saddle grooves, and the other end of the main cable passes through the main tower and then is connected with the conventional anchor. The main cable is uniformly stressed under the karst cave terrain.

Description

Technical Field

[0001] The invention relates to an improvement in a suspension bridge erection technology, belongs to the field of bridges, and in particular to a revolving main cable suspension bridge applied to karst cave terrain. Background Art

[0002] A suspension bridge includes anchors, main cables, main towers, main cable saddles, and loose cable saddles. The anchors are mainly used to fix the main cables and provide a foundation for the main cable anchoring. The main cable saddles are used to support the main cables and smoothly change the direction of the main cables. They are generally located on the top of the main tower. At present, conventional suspension bridges are equipped with left and right main cables. The left and right main cables are respectively equipped with two independent main cable saddles, loose cable saddles and two anchor points. Each main cable starts from the longitudinal center point of the bridge and passes through the main cable saddles and loose cable saddles on both sides and is anchored on the anchors. The anchors are generally divided into gravity anchors and tunnel anchors. Due to the geographical location restrictions of the bridge construction, the underground caves and the terrain, the space in the caves is tortuous. Some locations have large spaces, some have small spaces, and places with large spaces are more convenient to get around. The ability to withstand pressure is poor, while places with very small spaces can withstand relatively large pressure, resulting in different pressure-bearing capacities in all directions of the mountain outside the cave. Due to this terrain, the mountain cannot be equipped with main towers and conventional gravity anchors or tunnel anchors. The inability to install main towers and conventional gravity anchors will amplify the effects of wind loads and vibrations on the main cables of the suspension bridge, causing displacement changes in the main cables and increasing the force on the saddles. Since the pressure-bearing capacity of each part of the mountain outside the cave is different, and the two sets of main saddles normally installed on the sides are fixed, additional force will be applied to the main cables, making the force on all saddles uneven. Excessive stress is prone to occur in the main cables and saddles, causing partial collapse of the cave and damage to the bridge structure.

[0003] A Chinese patent application with application number CN202410131925.3 and application date January 31, 2024 discloses a saddle system for a revolving main cable suspension bridge and a method for installing a revolving main cable, including a revolving shore anchor, wherein revolving saddles are provided on the central axis and on both sides of the revolving shore anchor, the revolving saddle includes a saddle body, a saddle head is provided on the saddle body, a saddle groove is provided on the saddle head, and the saddle groove of the revolving saddle opens upward. By changing the entry direction of the revolving saddle, the entry directions of the revolving saddle and the conventional saddle are both from top to bottom, and the arrangement of the revolving main cable in each saddle is the same, thereby reducing the workload in design and construction. The above scheme reduces the workload of construction by changing the entry direction of the revolving saddle, but does not solve the problem of uneven force on the main cable under the karst cave terrain.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of this patent application, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the invention

[0005] The purpose of the present invention is to overcome the problem of uneven stress on the main cable in karst cave terrain in the prior art, and to provide a revolving main cable suspension bridge for use in karst cave terrain with uneven stress on the main cable.

[0006] To achieve the above objectives, the technical solution of the present invention is: a revolving main cable suspension bridge applied to karst cave terrain, the revolving main cable suspension bridge applied to karst cave terrain comprises a plurality of revolving cable saddles, main cables, annular revolving anchors, embedded bottom plates, main towers and conventional anchors; The bottom of each slewing saddle is connected to the top of the saddle body bottom plate, the bottom of the saddle body bottom plate is connected to the top of the embedded bottom plate, the embedded bottom plate is embedded in the slewing anchor, and the top of the slewing saddle is provided with a plurality of saddle grooves for placing the main cables, and the main cables are arranged in the saddle grooves; All the slewing saddles are evenly distributed in an annular shape on the top arc surface of the slewing anchor, and two adjacent slewing saddles are fixed by high-strength bolts; The annular slewing anchor and the conventional anchor are respectively arranged on both sides of the river bank, one end of the main cable is connected to a plurality of slewing saddles after passing through the main tower, the main cable is annularly arranged in the saddle grooves of all slewing saddles along the saddle groove, and the other end of the main cable is connected to the conventional anchor after passing through the main tower; A plurality of longitudinally arranged partitions are arranged in the saddle groove of the rotary saddle, and the main cable is arranged between two adjacent partitions.

[0007] The plurality of partitions are distributed in a stepped manner with the vertical center line of the saddle groove as the center, and the main cable is stacked in sequence along the gap between two partitions.

[0008] The partition plate and the vertical center line of the saddle groove are arranged parallel to the main cable; The partition is an integral plate body with a thickness of 5-20 mm.

[0009] A tightening rod is arranged on the top of the rotary saddle and above the saddle groove, and both left and right sides of the tightening rod penetrate the rotary saddle; The tightening rod passes through the outer side of the rotary saddle and is provided with an external thread, and a fixing nut is threadedly matched on the external thread; A cushion block is arranged between the fixing nut and the side surface of the top of the slewing cable saddle, and the left and right sides of the cushion block are in contact with the fixing nut and the slewing cable saddle respectively.

[0010] The side of the rotary saddle is equipped with multiple groups of symmetrically arranged transverse ribs, and the bottoms of all the transverse ribs are connected to the top of the embedded bottom plate; The embedded base plate is installed in the slewing anchor through the ground anchor bolts.

[0011] A plurality of groups of transverse ribs are equidistantly distributed on the side surfaces of the slewing saddle.

[0012] The embedded bottom plate comprises a plate body, embedded spiral holes and grouting holes. The top of the plate body is provided with a plurality of groups of grouting holes, and the top of the plate body is provided with two groups of transversely arranged embedded spiral holes.

[0013] The plurality of groups of grouting holes are distributed in a rectangular shape, and two groups of pre-buried spiral holes are arranged between two adjacent groups of grouting holes; Each embedded spiral hole is arranged between four adjacent grouting holes.

[0014] The main cables include main cables on the main span side and main cables on the side span side; The main cable on the main span side is arranged between the slewing anchor and the main tower, one end of the main cable on the main span side is connected to the slewing anchor, and the other end of the main cable on the main span side is connected to the main tower; The side span main cable is arranged between the conventional anchor and the main tower, one end of the main span main cable is connected to the main tower, and the other end of the main span main cable is connected to the conventional anchor.

[0015] The outer side of the slewing anchor is provided with a plurality of installation slots, and each slewing anchor is installed in a corresponding installation slot; The left and right sides of the plate body are clamped with the installation groove, and each of the embedded spiral holes is threadedly matched with a ground anchor bolt; One end of the anchor bolt passes through the slewing saddle, the plate body and the installation groove in sequence and is then inserted into the slewing anchor.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In a revolving main cable suspension bridge applied to karst cave terrain, the bottom of each revolving cable saddle is connected to the top of the saddle body bottom plate, and a plurality of saddle grooves for placing the main cables are provided on the top of the revolving cable saddle, and the main cables are arranged in the saddle grooves; the revolving cable saddles are evenly distributed in an annular manner on the top arc surface of the revolving anchor, and two adjacent revolving cable saddles are fixed by high-strength bolts, and a plurality of longitudinally arranged partitions are arranged in the saddle grooves of the revolving cable saddles, and the main cables are arranged between two adjacent partitions. When applied, in areas where there are underground karst caves, due to geological conditions and mountain shape factors, conventional anchors cannot be installed and used normally, and the mountain outside the karst cave terrain is fixed with a high-strength bolt. The cross section of the slewing anchor is processed into a polygon, and then one end of the main cable is fixed on a conventional anchor. After passing through the top of the main tower of the bridge, it is wrapped around the annular slewing saddle of the slewing anchor, and then passes through the top of the main tower of the bridge, and finally fixed on the conventional anchor. This solves the problem of geological conditions. At this time, the force of the cable is evenly distributed on multiple slewing saddles along the annular slewing anchor, so that the middle fixed saddle and the saddles on both sides can evenly bear the pressure load of the main cable, solving the problem of different pressures due to uneven spatial distribution in the karst cave terrain, and evenly dispersing the pressure of the main cable, thereby ensuring the safety of the bridge, and the main cable can smoothly change direction on the slewing anchor. Therefore, the main cable of the present invention is evenly stressed in the karst cave terrain.

[0017] 2. In a revolving main cable suspension bridge used in a karst cave terrain, a tightening rod is provided with an external thread on the outer side of the revolving saddle, and a fixing nut is provided on the external thread; a cushion block is provided between the fixing nut and the side of the top of the revolving saddle, and the left and right sides of the cushion block are in contact with the fixing nut and the revolving saddle respectively. When used, the lateral position of the cable is limited by the tightening rod, so that the distribution of the cable is more concentrated, and the cable is prevented from being scattered and accidentally caused by external factors. At the same time, the use of the cushion block can prevent the fixing nut from directly contacting the revolving saddle, thereby reducing wear. Therefore, the present invention is safe to use and reasonably designed.

[0018] 3. In a revolving main cable suspension bridge applied to a karst cave terrain, a columnar polygonal anchor is arranged on one side of the suspension bridge, and a distributed combined cable saddle is adopted, thereby solving the problem of inconvenience in constructing a main tower and conventional gravity anchor or tunnel anchor, reducing the engineering cost and saving the construction period, and the construction difficulty is also reduced accordingly. Therefore, the present invention has low construction cost and low difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 It is a structural schematic diagram of the rotary saddle in the present invention.

[0021] Figure 3 It is a side view of the rotary saddle in the present invention.

[0022] Figure 4 The present invention Figure 3 Schematic diagram of the structure at A in the middle.

[0023] Figure 5 It is a structural schematic diagram of the embedded base plate in the present invention.

[0024] Figure 6 It is a schematic diagram of the connection of adjacent rotary saddles in the present invention.

[0025] Figure 7 It is an installation schematic diagram of the present invention.

[0026] Figure 8 The present invention Figure 7 Top view of the .

[0027] In the figure: a slewing saddle 1, a saddle groove 11, a transverse rib plate 12, a saddle body bottom plate 13, a tightening rod 2, a main cable 3, a main cable on the main span side 31, a main cable on the side span side 32, an annular slewing anchor 4, a mounting groove 41, an embedded bottom plate 5, a plate body 51, an embedded spiral hole 52, a grouting hole 53, a ground anchor bolt 6, a partition plate 7, a high-strength bolt 8, a main tower 9, and a conventional anchor 10. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] See also Figures 1 to 8 A revolving main cable suspension bridge applied to a karst cave terrain, the revolving main cable suspension bridge applied to a karst cave terrain comprises a plurality of revolving cable saddles 1, a main cable 3, an annular revolving anchor 4, a pre-buried bottom plate 5, a main tower 9 and a conventional anchor 10; The bottom of each of the slewing saddles 1 is connected to the top of the saddle bottom plate 13, the bottom of the saddle bottom plate 13 is connected to the top of the embedded bottom plate 5, the embedded bottom plate 5 is embedded in the slewing anchor 4, and a plurality of saddle grooves 11 for placing the main cables 3 are opened on the top of the slewing saddle 1, and the main cables 3 are arranged in the saddle grooves 11; All the slewing saddles 1 are evenly distributed in an annular shape on the top arc surface of the slewing anchor 4, and two adjacent slewing saddles 1 are fixed by high-strength bolts 8; The annular slewing anchor 4 and the conventional anchor 10 are respectively arranged on both sides of the river bank, one end of the main cable 3 is connected to a plurality of slewing saddles 1 after passing through the main tower 9, the main cable 3 is annularly arranged in the saddle grooves 11 of all slewing saddles 1 along the saddle groove 11, and the other end of the main cable 3 is connected to the conventional anchor 10 after passing through the main tower 9; A plurality of longitudinally arranged partitions 7 are arranged in the saddle groove 11 of the revolving saddle 1 , and the main cable 3 is arranged between two adjacent partitions 7 .

[0030] The plurality of partitions 7 are distributed in a stepped manner with the vertical center line of the saddle groove 11 as the center, and the main cable 3 is stacked in sequence along the gap between two partitions 7 .

[0031] The partition plate 7 and the saddle groove 11 are arranged parallel to the vertical center line of the main cable 3; The partition plate 7 is an integral plate body with a thickness of 5-20 mm.

[0032] A tightening rod 2 is arranged on the top of the rotary saddle 1 above the saddle groove 11, and both left and right sides of the tightening rod 2 penetrate the rotary saddle 1; The tightening rod 2 passes through the outer side of the rotary saddle 1 and is provided with an external thread, and a fixing nut is threaded on the external thread; A cushion block is arranged between the fixing nut and the side surface of the top of the slewing saddle 1 , and the left and right sides of the cushion block are in contact with the fixing nut and the slewing saddle 1 respectively.

[0033] The side of the rotary saddle 1 is symmetrically provided with multiple groups of transverse ribs 12, and the bottoms of all transverse ribs 12 are connected to the top of the embedded bottom plate 5; The embedded base plate 5 is installed in the slewing anchor 4 through the ground anchor bolts 6.

[0034] A plurality of groups of transverse ribs 12 are distributed at equal distances on the side surfaces of the rotary saddle 1 .

[0035] The embedded bottom plate 5 includes a plate body 51 , embedded spiral holes 52 and grouting holes 53 . A plurality of grouting holes 53 are provided on the top of the plate body 51 . Two transversely arranged embedded spiral holes 52 are provided on the top of the plate body 51 .

[0036] The plurality of groups of grouting holes 53 are distributed in a rectangular shape, and two groups of pre-buried spiral holes 52 are arranged between two adjacent groups of grouting holes 53; Each pre-buried spiral hole 52 is arranged between four adjacent grouting holes 53 .

[0037] The main cable 3 includes a main span side main cable 31 and a side span side main cable 32; The main cable 31 on the main span side is arranged between the slewing anchor 4 and the main tower 9, one end of the main cable 31 on the main span side is connected to the slewing anchor 4, and the other end of the main cable 31 on the main span side is connected to the main tower 9; The side span main cable 32 is arranged between the conventional anchor 10 and the main tower 9 , one end of the main span main cable 31 is connected to the main tower 9 , and the other end of the main span main cable 31 is connected to the conventional anchor 10 .

[0038] The outer side of the slewing anchor 4 is provided with a plurality of mounting grooves 41, and each slewing anchor 4 is mounted in a corresponding mounting groove 41; The left and right sides of the plate body 51 are snap-fitted with the installation groove 41, and each of the embedded spiral holes 52 is threadedly fitted with a ground anchor bolt 4; One end of the anchor bolt 4 passes through the slewing saddle 1, the plate body 51, and the mounting groove 41 in sequence and is then inserted into the slewing anchor 4.

[0039] The supplementary description of the present invention is as follows: When the cross section of the slewing anchor is polygonal, more than 8 sides can be used, with two horizontal sides on the upper and lower sides of the anchor, and the rest are oblique sides. It can be arranged in the form of one fixed saddle + an even number (2, 4 or 6) of side saddles, where the fixed saddle is located at the center of the upper horizontal side of the slewing anchor, and the side saddles and the fixed saddle are symmetrically arranged on the oblique sides between the vertical sides on the inclined planes of the two side sides and the middle saddle. The side saddle arrangement must ensure that the wrap angle of the main cable on the middle saddle is not less than 90°, and the wrap angle of the main cable on the side saddle is not less than 120°, so as to ensure that the middle fixed saddle and the side saddles on both sides can more evenly bear the pressure load of the main cable, and the main cable can smoothly change direction on the slewing anchor.

[0040] Embodiment 1: A revolving main cable suspension bridge applied to karst terrain, the revolving main cable suspension bridge applied to karst terrain comprises a plurality of revolving cable saddles 1, a main cable 3, an annular revolving anchor 4, a pre-buried bottom plate 5, a main tower 9 and a conventional anchor 10; the bottom of each revolving cable saddle 1 is connected to the top of a saddle body bottom plate 13, the bottom of the saddle body bottom plate 13 is connected to the top of the pre-buried bottom plate 5, the pre-buried bottom plate 5 is embedded in the revolving anchor 4, a plurality of saddle grooves 11 for placing the main cables 3 are opened on the top of the revolving cable saddle 1, and the main cables 3 are arranged in the saddle grooves 11; all the revolving cable saddles 1 are The main cable 3 is evenly distributed in an annular shape on the top arc surface of the slewing anchor 4, and two adjacent slewing saddles 1 are fixed by high-strength bolts 8; the annular slewing anchor 4 and the conventional anchor 10 are respectively arranged on both sides of the river bank, one end of the main cable 3 is connected to multiple slewing saddles 1 after passing through the main tower 9, the main cable 3 is annularly arranged in the saddle groove 11 of all slewing saddles 1 along the saddle groove 11, and the other end of the main cable 3 is connected to the conventional anchor 10 after passing through the main tower 9, and a plurality of longitudinally arranged partitions 7 are arranged in the saddle groove 11 of the slewing saddle 1, and the main cable 3 is arranged between two adjacent partitions 7.

[0041] When in use: one end of the main cable 3 is fixed on the conventional anchor 10, passes through the top of the main tower 9 of the bridge, surrounds the slewing saddle 1 on the annular slewing anchor 4, passes through the top of the main tower 9 of the bridge, and is finally fixed on the conventional anchor 10. The partition 7 only bears the friction force caused by the pressure of the main cable 3, and does not directly bear the pressure of the main cable 3.

[0042] Embodiment 2: Embodiment 2 is substantially the same as Embodiment 1, except that: A plurality of longitudinally arranged partitions 7 are arranged in the saddle groove 11 of the revolving cable saddle 1, and the main cable 3 is arranged between two adjacent partitions 7; the plurality of partitions 7 are arranged in a stepped manner with the vertical center line of the saddle groove 11 as the center, and the main cable 3 is arranged in sequence along the gap between the two partitions 7; the partitions 7, the vertical center line of the saddle groove 11 and the main cable 3 are arranged in parallel; the partitions 7 are integral plates with a thickness of 5-20 mm; a tightening rod 2 is arranged on the top of the revolving cable saddle 1 above the saddle groove 11, and the tightening rod 2 passes through the slewing saddle 1 on both sides; the tightening rod 2 passes through the outer side of the slewing saddle 1 and is provided with an external thread, and the external thread is threaded with a fixing nut; a cushion block is provided between the fixing nut and the side of the top of the slewing saddle 1, and the left and right sides of the cushion block are in contact with the fixing nut and the slewing saddle 1 respectively; the side of the slewing saddle 1 is symmetrically installed with multiple groups of transverse ribs 12, the bottoms of all the transverse ribs 12 are connected to the top of the embedded bottom plate 5, and the multiple groups of transverse ribs 12 are equidistantly distributed on the side of the slewing saddle 1.

[0043] When in use: the center line of the saddle groove of the slewing saddle and the surface of the partition 7 are parallel to the horizontal reference plane of the main cable 3 at the slewing anchor, ensuring that the main cable force pressure acts on the saddle groove bottom plate and the saddle body support plate. The partition only bears the friction caused by the pressure of the main cable, and does not directly bear the pressure of the main cable, which can greatly reduce the force of the partition, reduce the wear on the partition, and improve the durability of the saddle.

[0044] Embodiment 3: Embodiment 3 is substantially the same as Embodiment 1, except that: The embedded bottom plate 5 includes a plate body 51, embedded spiral holes 52 and grouting holes 53. A plurality of groups of grouting holes 53 are provided on the top of the plate body 51. Two groups of transversely arranged embedded spiral holes 52 are provided on the top of the plate body 51. The plurality of groups of grouting holes 53 are distributed in a rectangular shape. Two groups of embedded spiral holes 52 are arranged between two adjacent groups of grouting holes 53 at intervals. Each embedded spiral hole 52 is arranged between four adjacent grouting holes 53. The main cable 3 includes a main span side main cable 31 and a side span side main cable 32. The main span side main cable 31 is arranged between the slewing anchor 4 and the main tower 9. One end of the main span side main cable 31 is connected to the slewing anchor 4. The other end of the span side main cable 31 is connected to the main tower 9; the side span side main cable 32 is arranged between the conventional anchor 10 and the main tower 9, one end of the main span side main cable 31 is connected to the main tower 9, and the other end of the main span side main cable 31 is connected to the conventional anchor 10. The outer side of the slewing anchor 4 is surrounded by a plurality of installation grooves 41, and each slewing anchor 4 is installed in a corresponding installation groove 41; the left and right sides of the plate body 51 are clamped with the installation groove 41, and each of the embedded spiral holes 52 is threadedly fitted with a ground anchor bolt 4; one end of the ground anchor bolt 4 passes through the slewing saddle 1, the plate body 51, and the installation groove 41 in sequence and is inserted into the slewing anchor 4.

[0045] When used: the slewing anchor 4 adopts a semi-cylindrical structure, the main cable 3 is wrapped around the arc surface of the slewing anchor 4, the main cable 3 is composed of multiple strands of galvanized steel wire, and the side saddle arrangement must ensure that the wrap angle of the main cable 3 on the middle saddle is not less than 90°, and the wrap angle of the main cable 3 on the side saddle is not less than 120°.

[0046] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A revolving main cable suspension bridge applied to karst cave terrain, characterized by: The revolving main cable suspension bridge applied to karst cave terrain comprises a plurality of revolving cable saddles (1), a main cable (3), an annular revolving anchor (4), a pre-buried base plate (5), a main tower (9) and a conventional anchor (10); The bottom of each slewing saddle (1) is connected to the top of the saddle body bottom plate (13), the bottom of the saddle body bottom plate (13) is connected to the top of the embedded bottom plate (5), the embedded bottom plate (5) is embedded in the slewing anchor (4), and the top of the slewing saddle (1) is provided with a plurality of saddle grooves (11) for placing the main cables (3), and the main cables (3) are arranged in the saddle grooves (11); All the slewing saddles (1) are evenly distributed in an annular shape on the top arc surface of the slewing anchor (4), and two adjacent slewing saddles (1) are fixed by high-strength bolts (8); The annular slewing anchor (4) and the conventional anchor (10) are respectively arranged on both sides of the river bank, one end of the main cable (3) is connected to a plurality of slewing saddles (1) via a main tower (9), the main cable (3) is annularly arranged in the saddle grooves (11) of all slewing saddles (1) along the saddle grooves (11), and the other end of the main cable (3) is connected to the conventional anchor (10) via a main tower (9); A plurality of longitudinally arranged partitions (7) are arranged in the saddle groove (11) of the rotary saddle (1), and the main cable (3) is arranged between two adjacent partitions (7).

2. The main cable revolving suspension bridge for use in karst cave terrain according to claim 1, characterized in that: The plurality of partitions (7) are distributed in a stepped manner with the vertical center line of the saddle groove (11) as the center, and the main cable (3) is stacked in sequence along the gap between two partitions (7); 3. The main cable revolving suspension bridge for use in karst cave terrain according to claim 2, characterized in that: The partition (7) and the saddle groove (11) are arranged parallel to the vertical center line of the main cable (3); the partition (7) is an integral plate body with a thickness of 5-20 mm.

4. The main cable revolving suspension bridge for use in karst cave terrain according to claim 3, characterized in that: A tightening rod (2) is provided at the top of the rotary saddle (1) above the saddle groove (11), and both left and right sides of the tightening rod (2) penetrate the rotary saddle (1); The tightening rod (2) passes through the outer side of the rotary saddle (1) and is provided with an external thread, and a fixing nut is threadedly matched on the external thread; A cushion block is provided between the fixing nut and the side surface of the top of the slewing saddle (1), and the left and right sides of the cushion block are in contact with the fixing nut and the slewing saddle (1) respectively.

5. The main cable revolving suspension bridge for use in karst cave terrain according to claim 1, characterized in that: A plurality of symmetrically arranged transverse rib plates (12) are installed on the side of the revolving saddle (1), and the bottoms of all the transverse rib plates (12) are connected to the top of the embedded bottom plate (5); The embedded base plate (5) is installed in the slewing anchor (4) via a ground anchor bolt (6).

6. The main cable revolving suspension bridge for use in karst cave terrain according to claim 5, characterized in that: A plurality of groups of transverse ribs (12) are distributed at equal distances on the side surfaces of the rotary saddle (1).

7. The main cable revolving suspension bridge for use in karst cave terrain according to claim 1, characterized in that: The embedded bottom plate (5) comprises a plate body (51), embedded spiral holes (52) and grouting holes (53); a plurality of groups of grouting holes (53) are provided on the top of the plate body (51); and two groups of embedded spiral holes (52) are provided on the top of the plate body (51) in a transverse arrangement.

8. The main cable revolving suspension bridge for use in karst cave terrain according to claim 7, characterized in that: The plurality of groups of grouting holes (53) are distributed in a rectangular shape, and two groups of pre-buried spiral holes (52) are arranged at intervals between two adjacent groups of grouting holes (53); Each pre-buried spiral hole (52) is arranged between four adjacent grouting holes (53).

9. The main cable revolving suspension bridge for use in karst cave terrain according to claim 8, characterized in that: The main cable (3) comprises a main span side main cable (31) and a side span side main cable (32); The main cable (31) on the main span side is arranged between the slewing anchor (4) and the main tower (9), one end of the main cable (31) on the main span side is connected to the slewing anchor (4), and the other end of the main cable (31) on the main span side is connected to the main tower (9); The side span main cable (32) is arranged between a conventional anchor (10) and a main tower (9), one end of the main span main cable (31) is connected to the main tower (9), and the other end of the main span main cable (31) is connected to a conventional anchor (10).

10. The main-cable revolving suspension bridge for use in karst cave terrain according to claim 9, characterized in that: The outer periphery of the slewing anchor (4) is provided with a plurality of installation grooves (41), and each slewing anchor (4) is installed in a corresponding installation groove (41); The left and right sides of the plate body (51) are snap-fitted with the installation groove (41), and each of the embedded spiral holes (52) is threadedly fitted with a foundation anchor bolt (4); One end of the anchor bolt (4) sequentially passes through the slewing saddle (1), the plate body (51), and the mounting groove (41) and is then inserted into the slewing anchor (4).

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