Suspension bridge main cable distributed rotary anchoring system and construction method

Abstract

The invention provides a suspension bridge main cable distributed rotary anchoring system and a construction method, and the system is buried in a stratum below the earth surface and comprises a cavern system, a main cable and cable strand structure and an anchoring structure. Two bridge main cables of a bridge penetrate through an inclined hole from the earth surface to enter an underground cavern and are vertically diverged into two rows of symmetrical cable strands at a cable saddle of an anchor chamber, an arc-shaped anchor hole is formed in the middle of the cable strands, arc-shaped protection pipes and auxiliary foundations which are vertically stacked are arranged on the side wall of the side, close to the cable strands, of the anchor hole, and the two ends of a rotating cable penetrate through the protection pipes and then are connected with the two rows of cable strands correspondingly. Therefore, distributed rotation and anchoring of bridge loads are realized. The large-thickness rock stratum can be fully utilized for bearing, and the anchoring system has good stability and reliability.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to a distributed rotary anchoring system for main cables of a suspension bridge and a construction method thereof. Background Art

[0002] The anchorage of a suspension bridge is a key component that transfers the huge main cable tension to the foundation through the anchor body or rock mass. The anchorage type of most suspension bridges is ground anchor, which is divided into gravity anchor, tunnel anchor and rock anchor. Tunnel anchor is a type of anchor that has been fully recognized and developed in the past 30 years, and its bearing characteristics and related mechanisms have been extensively studied. In recent years, a new type of rotary anchoring system has emerged. The two main cables of the suspension bridge are designed to be connected to each other and provide reaction forces to each other. The bearing capacity of the rotary anchoring system is directly related to the height of the rock layer clamped by the two cables. The thicker the clamped rock layer, the smaller the stress applied to the foundation and rock mass, and the better the stability and bearing capacity of the anchoring system.

[0003] There are two rotation methods for the existing rotary anchoring system: one is direct rotation without dispersing the main cable, and the other is rotation after the main cable is dispersed in a circle. The two methods have greatly promoted the progress of related technologies, but neither can effectively utilize thick rock layers for load bearing. Summary of the invention

[0004] In view of the defects of the prior art, the present invention provides a distributed rotary anchoring system and a construction method for the main cables of a suspension bridge. The two main cables of the bridge enter the anchor chamber through an inclined hole, and are dispersed into two rows of cable strands in a vertical plane through transversely buried loose cable saddles. The cable strands are connected by vertically stacked rotating cables to distribute and anchor the bridge load. The present invention can make full use of rock strata with a relatively large thickness for bearing, and the anchoring system has good stability and reliability.

[0005] A distributed rotary anchoring system for main cables of a suspension bridge, buried in the ground below the surface, comprises a cavern system, a main cable and strand structure and an anchoring structure;

[0006] The main cable and cable strand structure is used to introduce the bridge main cable for transmitting bridge load into the underground space and disperse it into multiple cable strands, wherein the main cable and cable strand structure includes a first main cable and a second main cable constituting the bridge main cable, and a first cable strand and a second cable strand respectively dispersed from the first main cable and the second main cable;

[0007] The cave system is an underground space excavated in the stratum, providing a space for the main cable and cable strand structure and anchor structure to be stored and constructed. The cave system includes a first inclined cave, a first anchor chamber, a second inclined cave, a second anchor chamber and an anchor hole; the first inclined cave connects the surface to the first anchor chamber, providing a space for the first main cable to pass through; the first anchor chamber connects the first inclined cave to the anchor hole, providing a space for the first cable strand to be dispersed; the second inclined cave connects the surface to the second anchor chamber, providing a space for the second main cable to pass through; the second anchor chamber connects the second inclined cave to the anchor hole, providing a space for the second cable strand to be dispersed; the anchor hole is a passage connecting the first anchor chamber to the second anchor chamber;

[0008] The anchoring structure adopts a plurality of rotating cables to distribute and rotate and anchor the first cable strand and the second cable strand.

[0009] Furthermore, the main cable and strand structure further includes a first loose cable saddle and a second loose cable saddle;

[0010] The first cable saddle is located at the front of the first anchor chamber, near the first inclined hole, the center line of the saddle groove of the first cable saddle is parallel to the first main cable, and is used to disperse the first main cable into multiple first cable strands in the vertical direction, and the first cable strands are dispersedly arranged with a triangle as the outer contour in the vertical plane;

[0011] The second cable saddle is located at the front of the second anchor chamber, adjacent to the second inclined hole. The center line of the saddle groove of the second cable saddle is parallel to the second main cable, and is used to disperse the second main cable into multiple second cable strands in the vertical direction. The second cable strands are dispersedly arranged in a triangle as the outer contour in the vertical plane.

[0012] Furthermore, the main cable and strand structure also includes the first loose cable saddle base, which is located on the rock wall of the first loose cable saddle base and is cast on-site with concrete to level the rock wall and provide an installation foundation for the first loose cable saddle.

[0013] Furthermore, the main cable and strand structure also includes the second loose cable saddle base, which is located on the rock wall of the second loose cable saddle base and is cast on-site with concrete to level the rock wall and provide an installation foundation for the second loose cable saddle.

[0014] Further, the anchoring structure includes a rotating cable, a first anchor, a first arc-shaped protective tube, a second anchor, a second arc-shaped protective tube, and a third arc-shaped protective tube;

[0015] The two ends of the transfer cable are respectively connected to the first cable strand and the second cable strand to transfer and anchor the load. The transfer cable is in a plane arc shape and is stacked in the vertical direction. The number of the transfer cables is equal to that of the first main cable and the second main cable.

[0016] The first anchor clamps and fixes one end of the rotating cable, and the first anchors are stacked in the vertical direction;

[0017] The second anchor clamps and fixes the other end of the rotating cable, and the second anchors are stacked in the vertical direction;

[0018] The first arc-shaped protective pipe has an axis extending in a horizontal plane and is made of a steel material with a circular cross-section, and is used to support the rotating cable and provide a passage through which the cable passes, and is stacked in a vertical direction;

[0019] The axis of the second arc-shaped protective pipe is an arc extending in the horizontal plane, and is made of steel material with a circular cross-section, used to support the rotating cable and provide a passage for passing through, and is stacked in the vertical direction;

[0020] The axis of the third arc-shaped protective pipe is an arc extending in the horizontal plane. It is made of steel material with a semicircular cross-section, and is used to support the rotating cable and provide a passage for passing through. It is stacked in the vertical direction. The axis of the third arc-shaped protective pipe is connected to the axis of the first arc-shaped protective pipe and the axis of the second arc-shaped protective pipe and is in the same plane.

[0021] Furthermore, the anchoring structure also includes a first arc-shaped foundation, a second arc-shaped foundation, and a third arc-shaped foundation. The first arc-shaped protective tube is buried in the first arc-shaped foundation, and the first anchor is located outside the first arc-shaped foundation and the first arc-shaped protective tube; the second arc-shaped protective tube is buried in the second arc-shaped foundation, and the second anchor is located outside the second arc-shaped foundation and the second arc-shaped protective tube; the third arc-shaped protective tube is buried in the third arc-shaped foundation.

[0022] Furthermore, the cross-sections of the first arc-shaped foundation, the second arc-shaped foundation and the third arc-shaped foundation are arcs extending in a horizontal plane.

[0023] A method for constructing a distributed rotary anchoring system for a main cable of a suspension bridge as described above comprises the following steps:

[0024] Step S1: excavating and supporting the cavern system to form an underground space. Step S1 specifically includes:

[0025] Step S11, excavating a first supporting inclined tunnel from the ground surface to the tunnel bottom, excavating the first supporting inclined tunnel to the first horizontal tunnel to form the tunnel top of the first anchor chamber, excavating the first supporting horizontal tunnel to the second horizontal tunnel to form the tunnel bottom of the first anchor chamber;

[0026] Step S12: excavating a second supporting inclined tunnel from the ground surface to the tunnel bottom, excavating the second supporting inclined tunnel to the first flat tunnel to form the tunnel top of the second anchor chamber; excavating the second supporting flat tunnel to the second flat tunnel to form the tunnel bottom of the second anchor chamber;

[0027] Step S13, excavating a first supporting leveling hole to form the top of the anchor hole; excavating a second supporting leveling hole to form the bottom of the anchor hole;

[0028] Step S14, using the first flat tunnel as a construction space for personnel and machinery and the second flat tunnel as a slag discharge channel, excavating the anchor hole body from the middle of the anchor hole to both sides and completing the support;

[0029] Step S15, using the first inclined tunnel as a construction space for personnel and machinery, and the first support flat tunnel as a slag discharge channel, excavating the first tunnel body from the bottom of the first anchor chamber and completing the support;

[0030] Step S16, using the second inclined tunnel as a construction space for personnel and machinery, and the second support flat tunnel as a slag discharge channel, excavating the second tunnel body from the bottom of the second anchor chamber and completing the support;

[0031] Step S2: anchoring structure construction. Step S2 specifically includes:

[0032] Step S21, installing a bracket on the side wall of the anchor hole to fix the third arc-shaped protective pipe, and using a template to cast the third arc-shaped foundation in sections;

[0033] Step S22, installing a bracket on the side wall of the anchor hole to fix the first arc-shaped protective pipe, and using a template to cast the first arc-shaped foundation in sections;

[0034] Step S23, installing a bracket on the side wall of the anchor hole to fix the second arc-shaped protective pipe, and using a template to cast the second arc-shaped foundation in sections;

[0035] Step S24, two ends of the transfer cable pass through the first arc-shaped protective tube and the second arc-shaped protective tube respectively, and the middle part is located in the third arc-shaped protective tube;

[0036] Step S25, synchronously installing and locking the first anchor and the second anchor;

[0037] Step S3: constructing the main cable and strand structure. Step S3 specifically includes:

[0038] Step S31, casting a first loose cable saddle base on the side wall of the first anchor chamber, and installing the first loose cable saddle;

[0039] Step S32, casting a second loose cable saddle base on the side wall of the second anchor chamber, and installing the second loose cable saddle;

[0040] Step S33, the first main cable enters the cave from the first inclined hole, directly reaches the first cable saddle, and is dispersed into multiple first cable strands;

[0041] Step S34, the second main cable enters the cave from the second inclined hole, directly reaches the second cable saddle, and is dispersed into multiple second cable strands;

[0042] Step S35, the first strand and the second strand at both ends of each transfer cable are installed and locked synchronously until all the strands and all the transfer cables are connected;

[0043] Step S4: anchor system operation and maintenance.

[0044] Furthermore, step S4 includes: applying anti-corrosion materials to the exposed concrete and steel strands of the main cable and strand structure and the anchor structure; laying drainage and exhaust pipes at different positions in the anchor room and anchor hole, and discharging them through the first inclined hole and the second inclined hole; observing and testing the operating conditions of the anchor structure during the long-term operation stage, and performing cable replacement and foundation reinforcement.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] 1. The present invention provides a distributed rotary anchoring scheme for the main cable of a suspension bridge. The two main cables of the suspension bridge are connected to each other through a rotating cable in the underground space and bear the load. The width of the cavern only needs to be 3 to 4 meters to meet the space for all structural burial and construction. There is no need for large-scale underground cavern excavation, which is safer and less costly.

[0047] 2. The distributed rotary anchoring system provided by the present invention does not require large-scale concrete anchor casting and has good economic benefits.

[0048] 3. The main cable and strand structure provided by the present invention adopts a loose cable saddle buried in the side wall of the anchor hole to disperse the main cable in the vertical plane, with clear strand arrangement and simple installation and maintenance.

[0049] 4. The anchoring structure provided by the present invention adopts vertically stacked arc-shaped protective pipes and auxiliary foundations. The rotating cables can be buried in the protective pipes in a dispersed manner. After the two ends are connected to the main cable, the distributed rotating cable force can utilize thicker rock layers to share the load. The stress concentration of the rock layer and the foundation is greatly reduced, and the stability and reliability are significantly improved.

[0050] 5. The cavern system of the present invention adopts a construction method of expanding the cavern body after a small pilot tunnel is penetrated, which can effectively control the excavation and support engineering volume of a single cycle, and is beneficial to improving the stability of the cavern surrounding rock.

[0051] 6. The cavern system of the present invention is through-going, and only a small part is backfilled, and all components of the anchoring system are directly exposed, which provides greater convenience for maintenance during the long-term operation stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 Oblique cross-section cavern and structural layout diagram of the anchoring system of the present invention;

[0053] Figure 2 A longitudinal section of the cavern and structural layout of the anchoring system of the present invention;

[0054] Figure 3 Shape diagram of the cross section of the inclined tunnel and traffic tunnel of the present invention;

[0055] Figure 4 Anchorage distribution diagram of the anchorage structure of the present invention;

[0056] Figure 5 The present invention Figure 1 The cavern and structural layout of the middle section A;

[0057] Figure 6 The present invention Figure 1 The cavern and structural layout of the middle section B;

[0058] Figure 7 A longitudinally expanded layout diagram of the arc-shaped anchoring structure of the present invention;

[0059] Figure 8 A schematic diagram of the installation of the arc-shaped protective pipe and foundation of the present invention;

[0060] Fig. 9 Schematic diagram of the partitioning and excavation of the cavern system of the present invention. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a distributed rotary anchoring system for a main cable of a suspension bridge, which is buried in a stratum 2 below the ground surface 1 and includes a cavern system 3, a main cable and strand structure 4 and an anchoring structure 5.

[0063] The cavern system 3 is an underground space excavated in the stratum 2, providing a space for the main cable and strand structure 4 and the anchor structure 5 to be stored and constructed. The cavern system 3 includes a first inclined cave 31a, a first anchor chamber 32a, a second inclined cave 31b, a second anchor chamber 32b and an anchor cave 33.

[0064] The first inclined hole 31a is a passage connecting the ground surface 1 to the first anchor chamber 32a, providing a space for the first main cable 41a to pass through. The axis of the first inclined hole 31a is parallel to the direction of the first main cable 41a. The first inclined hole 31a is a semicircular arch section with straight walls of equal diameter, such as Figure 3 shown.

[0065] The first anchor chamber 32a is a passage connecting the first inclined hole 31a to the anchor hole 33, providing a space for the first cable strand 44a to disperse. The axis of the first anchor chamber 32a is parallel to the direction of the first main cable 41a, and is a variable diameter straight wall semicircular arch section. From the first inclined hole 31a to the anchor hole 33, the height of the chamber gradually increases.

[0066] The second inclined hole 31b is a passage connecting the ground surface 1 to the second anchor chamber 32b, providing a space for the second main cable 41b to pass through, and the axis of the second inclined hole 31b is parallel to the direction of the second main cable 41b. The second inclined hole 31b is a semicircular arch section with equal diameter straight walls.

[0067] The second anchor chamber 32b is a passage connecting the second inclined hole 31b to the anchor hole 33, providing a space for the second cable strand 44b to disperse. The axis of the second anchor chamber 32b is parallel to the direction of the second main cable 41b, and is a variable diameter straight wall semicircular arch section. From the second inclined hole 31b to the anchor hole 33, the height of the chamber gradually increases.

[0068] The anchor hole 33 is a passage connecting the first anchor chamber 32a to the second anchor chamber 32b, with a horizontal axis and a semicircular arch section with equal diameter straight walls. The section height can be 4 to 5 times or more of the width, so as to fully mobilize a larger range of rock strata to share the load.

[0069] The main cable and strand structure 4 introduces the bridge main cable 41 (first main cable 41a, first main cable 41a) for transmitting bridge load into the underground space and disperses it into multiple strands (first strand 44a, second strand 44b) for distributed anchoring. The main cable and strand structure 4 includes the first main cable 41a, the first loose cable saddle 42a, the first loose cable saddle base 43a, the first strand 44a, the second main cable 41b, the second loose cable saddle 42b, the second loose cable saddle base 43b and the second strand 44b.

[0070] The first main cable 41a is the main structure of the suspension bridge for transmitting loads, and enters the cave system 3 in the stratum 2 from the ground surface 1 through the first inclined tunnel 31a. The first main cable 41a is made of high-strength steel strands.

[0071] The first loose cable saddle 42a is located in front of the first anchor chamber 32a, near the first inclined hole 31a. The center line of the saddle groove of the first loose cable saddle 42a is parallel to the first main cable 41a, and is used to disperse the first main cable 41a into multiple first strands 44a in the vertical direction.

[0072] The first loose cable saddle base 43a is located on the rock wall at the base of the first loose cable saddle 42a and is cast on site with concrete to level the rock wall and provide an installation foundation for the first loose cable saddle 42a.

[0073] The first strands 44a are steel strands obtained by distributing the first main cable 41a. The first strands 44a are distributed in a triangle shape as the outer contour in a vertical plane. Figure 2 shown.

[0074] The second main cable 41b is the main structure of the suspension bridge for transferring loads, and enters the cave system 3 in the stratum 2 from the ground surface 1 through the second inclined tunnel 31b. The second main cable 41b is made of high-strength steel strands.

[0075] The second cable saddle 42b is located in front of the second anchor chamber 32b, near the second inclined hole 31b. The center line of the saddle groove of the second cable saddle 42b is parallel to the second main cable 41b, and is used to disperse the second main cable 41b into multiple second cables 44b in the vertical direction.

[0076] The second loose cable saddle base 43b is located on the rock wall at the base of the second loose cable saddle 42b and is cast on site with concrete to level the rock wall and provide an installation foundation for the second loose cable saddle 42b.

[0077] The second strands 44b are steel strands obtained by distributing the second main cable 41b. The second strands 44b are distributed and arranged in a triangle shape as an outer contour in a vertical plane.

[0078] The anchoring structure 5 uses a plurality of rotating cables 51 to distribute and rotate and anchor all the cable strands (the first cable strand 44a and the second cable strand 44b) to achieve the effect of bearing the bridge load. Figure 4-8 As shown, the anchoring structure 5 includes a rotating cable 51, a first anchor 52a, a first arc-shaped protective tube 53a, a first arc-shaped foundation 54a, a second anchor 52b, a second arc-shaped protective tube 53b, a second arc-shaped foundation 54b, a third arc-shaped protective tube 53c and a third arc-shaped foundation 54c.

[0079] The transfer cable 51 is the core component of the load distribution rotation of the bridge main cable 41. The two ends of the transfer cable 51 are respectively connected to the first cable strand 44a and the second cable strand 44b to transfer and anchor the load. The transfer cable 51 is a plane arc and is stacked in the vertical direction. The number of transfer cables 51 is equal to that of the first main cable 41a and the second main cable 42a, and they are made of the same high-strength steel strand material.

[0080] The first anchor 52a clamps and fixes one end of the rotating cable 51. The first anchor 52a is composed of an anchor plate, an anchor ring and a clamp, etc., and is located outside the first arc-shaped foundation 54a and the first arc-shaped protective tube 53a. The first anchor 52a is stacked in the vertical direction, such as Figure 4 shown.

[0081] The first arc-shaped protective tube 53a has an arc-shaped axis extending in the horizontal plane and is made of steel material with a circular cross-section and is stacked in the vertical direction. The first arc-shaped protective tube 53a is buried in the first arc-shaped foundation 54a to support the transfer cable 51 and provide a passage through which the transfer cable 51 passes. Figure 5 and Figure 8 shown.

[0082] The cross section of the first arc-shaped foundation 54a is an arc-shaped foundation extending in a horizontal plane, and plays a role in fixing and supporting the first arc-shaped protective pipe 53a by flattening the rock sidewall of the anchor hole 33. Figure 5 and Figure 8 shown.

[0083] The second anchor 52b clamps and fixes the other end of the rotating cable 51. The second anchor 52b is composed of an anchor plate, an anchor ring and a clamp, etc., and is located outside the second arc-shaped foundation 54b and the second arc-shaped protective tube 53b. The second anchor 52b is stacked in the vertical direction, such as Figure 4 shown.

[0084] The axis of the second arc-shaped protective tube 53b is an arc extending in the horizontal plane, and is made of steel material with a circular cross-section and is stacked in the vertical direction. The second arc-shaped protective tube 53b is buried in the second arc-shaped foundation 54b, and is used to support the transfer cable 51 and provide a passage through which the transfer cable 51 passes. Figure 7 and Figure 8 shown.

[0085] The cross section of the second arc-shaped foundation 54b is an arc-shaped horizontally extending arc-shaped foundation, which plays a role in fixing and supporting the second arc-shaped protective pipe 53b by leveling the rock sidewall of the anchor hole 33. Figure 4 and Figure 8 shown.

[0086] The axis of the third arc-shaped protective tube 53c is an arc extending in the horizontal plane, and is made of steel material with a semicircular cross-section and is stacked in the vertical direction. The axis of the third arc-shaped protective tube 53c is connected to the axis of the first arc-shaped protective tube 53a and the axis of the second arc-shaped protective tube 53b and is in the same plane. The third arc-shaped protective tube 53c is buried in the third arc-shaped foundation 54c, and is used to support the transfer cable 51 and provide a passage, such as Figure 6 and Figure 8 shown.

[0087] The cross section of the third arc-shaped foundation 54c is an arc-shaped horizontally extending arc-shaped foundation, which plays a role in fixing and supporting the third arc-shaped protective pipe 53c by leveling the rock sidewall of the anchor hole 33. Figure 6 and Figure 8 shown.

[0088] The embodiment of the present invention further provides a method for constructing the above-mentioned main cable distributed rotary anchoring system of the suspension bridge, comprising the following steps:

[0089] Step S1: excavating and supporting the cavern system 3 to form an underground space. Step S1 specifically includes:

[0090] Step S11: excavate the first inclined support hole 31a from the ground surface to the bottom of the hole, excavate the first supporting inclined hole 321a to the first horizontal hole 331 to form the top of the first anchor chamber 32a, and excavate the first supporting horizontal hole 322a to the second horizontal hole 332 to form the bottom of the first anchor chamber 32a. Fig. 9 shown.

[0091] Step S12: excavate the second inclined hole 31b from the surface to the bottom of the hole, excavate the second supporting inclined hole 321b to the first horizontal hole 331 to form the top of the second anchor chamber 32b; excavate the second supporting horizontal hole 322b to the second horizontal hole 332 to form the bottom of the second anchor chamber 32b. Fig. 9 shown.

[0092] Step S13: excavate the first support flat hole 331 to form the top of the anchor hole 33; excavate the second support flat hole 332 to form the bottom of the anchor hole 33. Fig. 9 shown.

[0093] Step S14: Using the first flat tunnel 331 as a construction space for personnel and machinery, and the second flat tunnel 332 as a slag discharge channel, excavate the anchor hole body 333 from the middle of the anchor hole 33 to both sides and complete the support. Fig. 9 shown.

[0094] Step S15, using the first inclined tunnel 321a as a construction space for personnel and machinery, and the horizontal tunnel 322a as a slag discharge channel, excavating the first tunnel body 323a from the bottom of the first anchor chamber 32a and completing the support.

[0095] Step S16: using the second inclined tunnel 321b as a construction space for personnel and machinery and the horizontal tunnel 322b as a slag discharge channel, excavating the second tunnel body 323b from the bottom of the second anchor chamber 32b and completing the support.

[0096] Step S2: constructing the anchoring structure 5. Step S2 specifically includes:

[0097] Step S21, installing a bracket on the side wall of the anchor hole 33 to fix the third arc-shaped protective pipe 53c, and using a template to cast the third arc-shaped foundation 54c in sections.

[0098] Step S22: Install a bracket on the side wall of the anchor hole 33 to fix the first arc-shaped protective pipe 53a, and use a template to cast the first arc-shaped foundation 54a in sections.

[0099] Step S23, mounting a bracket on the side wall of the anchor hole 33 to fix the second arc-shaped protective pipe 53b, and using a template to cast the second arc-shaped foundation 54b in sections.

[0100] Step S24: Both ends of the transfer cable 51 pass through the first arc-shaped protective tube 53a and the second arc-shaped protective tube 53b respectively, and the middle part is located in the third arc-shaped protective tube 53c.

[0101] Step S25: synchronously install and lock the first anchor 52a and the second anchor 52b.

[0102] Step S3: constructing the main cable and strand structure 4. Step S3 specifically includes:

[0103] Step S31, casting the first loose cable saddle base 43a on the side wall of the first anchor chamber 32a, and installing the first loose cable saddle 42a.

[0104] Step S32: Cast the second loose cable saddle base 43b on the side wall of the second anchor chamber 32b and install the second loose cable saddle 42b.

[0105] Step S33: The first main cable 41a enters the first inclined hole 31a, directly reaches the first cable saddle 42a, and is dispersed into a plurality of first cable strands 44a.

[0106] Step S34: The second main cable 41b enters the second inclined hole 31b, directly reaches the second cable saddle 42b, and is dispersed into a plurality of second cable strands 44b.

[0107] Step S35 , the first strands 44 a and the second strands 44 b at both ends of each transfer cable 51 are installed and locked synchronously until all the strands 44 and all the transfer cables 51 are connected.

[0108] Step S4: Anchor system operation and maintenance

[0109] The exposed concrete and steel strands of the main cable and strand structure 4 and the anchor structure 5 are coated with anti-corrosion materials. Drainage and exhaust pipes are laid at different positions of the anchor chamber 32 and the anchor hole 33, and discharged through the inclined hole 31. During the long-term operation stage, the operating conditions of the anchor structure 5 can be observed and tested, and engineering treatments such as cable replacement and foundation reinforcement can be carried out.

[0110] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A distributed rotary anchoring system for main cables of a suspension bridge, characterized in that: Buried in the ground below the surface, it includes the cavern system, main cable and strand structure and anchoring structure; The main cable and cable strand structure is used to introduce the bridge main cable for transmitting bridge load into the underground space and disperse it into multiple cable strands, wherein the main cable and cable strand structure includes a first main cable and a second main cable constituting the bridge main cable, and a first cable strand and a second cable strand respectively dispersed from the first main cable and the second main cable; The cave system is an underground space excavated in the stratum, providing a space for the main cable and cable strand structure and anchor structure to be stored and constructed. The cave system includes a first inclined cave, a first anchor chamber, a second inclined cave, a second anchor chamber and an anchor hole; the first inclined cave connects the surface to the first anchor chamber, providing a space for the first main cable to pass through; the first anchor chamber connects the first inclined cave to the anchor hole, providing a space for the first cable strand to be dispersed; the second inclined cave connects the surface to the second anchor chamber, providing a space for the second main cable to pass through; the second anchor chamber connects the second inclined cave to the anchor hole, providing a space for the second cable strand to be dispersed; the anchor hole is a passage connecting the first anchor chamber to the second anchor chamber; The anchoring structure adopts a plurality of rotating cables to distribute and rotate and anchor the first cable strand and the second cable strand.

2. The distributed rotary anchoring system for main cables of a suspension bridge according to claim 1, characterized in that: The main cable and strand structure further includes a first loose cable saddle and a second loose cable saddle; The first cable saddle is located at the front of the first anchor chamber, near the first inclined hole, the center line of the saddle groove of the first cable saddle is parallel to the first main cable, and is used to disperse the first main cable into multiple first cable strands in the vertical direction, and the first cable strands are dispersedly arranged with a triangle as the outer contour in the vertical plane; The second cable saddle is located at the front of the second anchor chamber, adjacent to the second inclined hole. The center line of the saddle groove of the second cable saddle is parallel to the second main cable, and is used to disperse the second main cable into multiple second cable strands in the vertical direction. The second cable strands are dispersedly arranged in a triangle as the outer contour in the vertical plane.

3. The distributed rotary anchoring system for main cables of a suspension bridge according to claim 2, characterized in that: The main cable and strand structure also includes the first loose cable saddle base, which is located on the rock wall of the first loose cable saddle base and is cast on site with concrete to level the rock wall and provide an installation foundation for the first loose cable saddle.

4. The distributed rotary anchoring system for main cables of a suspension bridge according to claim 2, characterized in that: The main cable and strand structure also includes the second loose cable saddle base, which is located on the rock wall of the second loose cable saddle base and is cast on site with concrete to level the rock wall and provide an installation foundation for the second loose cable saddle.

5. The distributed rotary anchoring system for main cables of a suspension bridge according to claim 1, characterized in that: The anchoring structure includes a rotating cable, a first anchor, a first arc-shaped protective tube, a second anchor, a second arc-shaped protective tube, and a third arc-shaped protective tube; The two ends of the transfer cable are respectively connected to the first cable strand and the second cable strand to transfer and anchor the load. The transfer cable is in a plane arc shape and is stacked in the vertical direction. The number of the transfer cables is equal to that of the first main cable and the second main cable. The first anchor clamps and fixes one end of the rotating cable, and the first anchors are stacked in the vertical direction; The second anchor clamps and fixes the other end of the rotating cable, and the second anchors are stacked in the vertical direction; The first arc-shaped protective pipe has an axis extending in a horizontal plane and is made of a steel material with a circular cross-section, and is used to support the rotating cable and provide a passage through which the cable passes, and is stacked in a vertical direction; The axis of the second arc-shaped protective pipe is an arc extending in the horizontal plane, and is made of a steel material with a circular cross-section, used to support the rotating cable and provide a passage for passing through, and is stacked in the vertical direction; The axis of the third arc-shaped protective pipe is an arc extending in the horizontal plane. It is made of steel material with a semicircular cross-section, and is used to support the rotating cable and provide a passage for passing through. It is stacked in the vertical direction. The axis of the third arc-shaped protective pipe is connected to the axis of the first arc-shaped protective pipe and the axis of the second arc-shaped protective pipe and is in the same plane.

6. The distributed rotary anchoring system for main cables of a suspension bridge according to claim 5, characterized in that: The anchoring structure further includes a first arc-shaped foundation, a second arc-shaped foundation, and a third arc-shaped foundation, wherein the first arc-shaped protective tube is buried in the first arc-shaped foundation, and the first anchor is located outside the first arc-shaped foundation and the first arc-shaped protective tube; The second arc-shaped protective pipe is buried in the second arc-shaped foundation, and the second anchor is located outside the second arc-shaped foundation and the second arc-shaped protective pipe; the third arc-shaped protective pipe is buried in the third arc-shaped foundation.

7. The distributed rotary anchoring system for main cables of a suspension bridge according to claim 6, characterized in that: The cross sections of the first arc-shaped foundation, the second arc-shaped foundation and the third arc-shaped foundation are arc-shaped extending in a horizontal plane.

8. A method for constructing a distributed rotary anchoring system for a main cable of a suspension bridge according to any one of claims 1 to 7, characterized in that: The steps include: Step S1: excavating and supporting the cavern system to form an underground space. Step S1 specifically includes: Step S11, excavating a first supporting inclined tunnel from the ground surface to the tunnel bottom, excavating the first supporting inclined tunnel to the first horizontal tunnel to form the tunnel top of the first anchor chamber, excavating the first supporting horizontal tunnel to the second horizontal tunnel to form the tunnel bottom of the first anchor chamber; Step S12: excavating a second supporting inclined tunnel from the ground surface to the tunnel bottom, excavating the second supporting inclined tunnel to the first flat tunnel to form the tunnel top of the second anchor chamber; excavating the second supporting flat tunnel to the second flat tunnel to form the tunnel bottom of the second anchor chamber; Step S13, excavating a first supporting leveling hole to form the top of the anchor hole; excavating a second supporting leveling hole to form the bottom of the anchor hole; Step S14, using the first flat tunnel as a construction space for personnel and machinery and the second flat tunnel as a slag discharge channel, excavating the anchor hole body from the middle of the anchor hole to both sides and completing the support; Step S15, using the first inclined tunnel as a construction space for personnel and machinery, and the first support flat tunnel as a slag discharge channel, excavating the first tunnel body from the bottom of the first anchor chamber and completing the support; Step S16, using the second inclined tunnel as a construction space for personnel and machinery, and the second support flat tunnel as a slag discharge channel, excavating the second tunnel body from the bottom of the second anchor chamber and completing the support; Step S2: anchoring structure construction. Step S2 specifically includes: Step S21, installing a bracket on the side wall of the anchor hole to fix the third arc-shaped protective pipe, and using a template to cast the third arc-shaped foundation in sections; Step S22, installing a bracket on the side wall of the anchor hole to fix the first arc-shaped protective pipe, and using a template to cast the first arc-shaped foundation in sections; Step S23, installing a bracket on the side wall of the anchor hole to fix the second arc-shaped protective pipe, and using a template to cast the second arc-shaped foundation in sections; Step S24, two ends of the transfer cable pass through the first arc-shaped protective tube and the second arc-shaped protective tube respectively, and the middle part is located in the third arc-shaped protective tube; Step S25, synchronously installing and locking the first anchor and the second anchor; Step S3: constructing the main cable and strand structure. Step S3 specifically includes: Step S31, casting a first loose cable saddle base on the side wall of the first anchor chamber, and installing the first loose cable saddle; Step S32, casting a second loose cable saddle base on the side wall of the second anchor chamber, and installing the second loose cable saddle; Step S33, the first main cable enters the cave from the first inclined hole, directly reaches the first cable saddle, and is dispersed into multiple first cable strands; Step S34, the second main cable enters the cave from the second inclined hole, directly reaches the second cable saddle, and is dispersed into multiple second cable strands; Step S35, the first strands and the second strands at both ends of each transfer cable are synchronously installed and locked until all the strands and all the transfer cables are connected; Step S4: anchor system operation and maintenance.

9. The method for constructing a distributed rotary anchoring system for main cables of a suspension bridge according to claim 8, characterized in that: Step S4 includes: applying anti-corrosion materials to the exposed concrete and steel strands of the main cable and strand structure and the anchor structure; laying drainage and exhaust pipes at different positions in the anchor room and anchor hole, and discharging them through the first inclined hole and the second inclined hole; observing and testing the operating conditions of the anchor structure during the long-term operation stage, and performing cable replacement and foundation reinforcement.

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