Bridge abutment type anchorage system, suspension bridge and construction method of suspension bridge

Abstract

The invention discloses a bridge abutment type anchorage system which comprises an anchorage rod fixedly connected in a bridge abutment and a cable saddle used for supporting a cable on the bridge abutment, and further comprises a tensioning device used for adjusting the length of the cable and a load detection module arranged on the cable saddle. And the length of the cable is adjusted through the tensioning device, so that the sag of the cable meets the preset load requirement. A simple structure is matched with a simple construction mode, the cable is easily adjusted to the designed sag in the cable building process so that follow-up construction can be facilitated, and it can be avoided that due to the fact that cutting and reworking are needed, the cost is increased, the construction period is prolonged, and delivery is affected.

Description

Technical Field

[0001] The present invention relates to the technical field of suspension bridges, and particularly to a bridge abutment anchor system, a suspension bridge and a construction method thereof. Background Art

[0002] The anchor is one of the core load-bearing structures of a suspension bridge, undertaking the important task of transmitting the huge tension of the main cable to the foundation. With the continuous increase in the span of suspension bridges (such as the 1915 Çanakkale Bridge in Turkey with a main span exceeding 2000 meters), higher requirements are imposed on anchor technology. In recent years, the research on anchor technology has mainly focused on material innovation, structural optimization, construction process improvement and intelligent monitoring, etc.

[0003] Generally, suspension bridges with a relatively large span usually adopt the method of cable-stayed bridges to transfer the load of the bridge to the main cable. These bridges are relatively large in spatial distribution. In some scenarios with limited space, such as in landscape and municipal scenarios, the cable-stayed bridge solution is not applicable because of the large consumption of materials and small load requirements. Generally, the main cable is under the bridge, and the main cable and the bridge are connected through support members.

[0004] For example, in the Chinese patent application with the publication number CN117468339A, the anchor rods connecting the two ends of the cable are cast in the bridge abutment, and the cable is supported by a saddle. In the overall construction steps, the cable is fixed first, and then the support members and the beam body are built. The support members and the bridge as a whole are prefabricated modules.

[0005] When implementing this technical solution specifically, according to the inertial engineering construction thinking, engineering construction personnel usually purchase or manufacture cables that are slightly longer than the designed length to better install the cables on the bridge abutment during construction, and to avoid excessive sag caused by insufficient cable length, resulting in the inability to normally install the prefabricated support members and bridge modules, or the upward convexity of the bridge deck after installation and not meeting the acceptance standards.

[0006] Such inertial thinking is common in engineering projects in various fields. Because the cable that exceeds the designed length can be cut, but the cable that is shorter than the designed length is directly scrapped and cannot be used, increasing the material consumption and transportation costs of the project. However, we found that when the cable that exceeds the drawing design length is actually constructed, because the cable is very thick and made of special materials, the on-site cutting requirements cannot be met. It cannot be bent and then cast, and it is easy to loosen after directly forced casting, so it needs to be transported back to the factory for rework. In some engineering projects, it even needs to be reworked several times, which seriously prolongs the project cycle, affects the delivery cycle, and may also affect the quality requirements during the project casting cycle synchronously.

[0007] To this end, the present application proposes a bridge-type anchor system that facilitates engineering construction to solve the problems of affecting the project progress and increasing the project cost due to the unchanged control of the cable length. Summary of the Invention

[0008] The object of the present invention is to solve the deficiencies in the prior art, and a bridge-type anchor system, a suspension bridge and its construction method are proposed. With a relatively simple structure and a simple construction method, it is easy to adjust the cable to the designed sag during the process of erecting the cable, which is conducive to subsequent construction, and can avoid increasing costs and construction periods due to problems such as trimming and rework, thus affecting delivery.

[0009] To achieve the above object, the present invention provides the following technical solutions: A bridge-type anchor system includes an anchor rod fixedly connected to the bridge abutment and a cable saddle on the bridge abutment for supporting the cable. It also includes a tensioning device for adjusting the length of the cable and a load detection module provided on the cable saddle. The force of the cable on the cable saddle is detected by the load detection module, and the length of the cable is adjusted by the tensioning device to make the sag of the cable meet the preset load requirements.

[0010] With the above structure, with a relatively simple structure and a simple construction method, it is easy to adjust the cable to the designed sag during the process of erecting the cable, which is conducive to subsequent construction, and can avoid increasing costs and construction periods due to problems such as trimming and rework, thus affecting delivery.

[0011] Preferably, threads are provided on the outer surface of the anchor rod. The tensioning device includes a sleeve fixedly connected to the bridge abutment and a positioning ring threadedly engaged with the anchor rod. The diameter of the cable , the outer diameter of the anchor rod , the caliber of the sleeve and the outer diameter of the positioning ring are such that: D ≤ < < .

[0012] With the above structure, a tensioning device that is easy to construct and operate and reduces the maintenance difficulty is constructed, making the erection of the cable more convenient, and the structure is relatively simple, with more advantages in manufacturing cost.

[0013] Preferably, the sleeve is cast in the bridge abutment and the length direction of the sleeve is aligned with the tangent direction of the cable saddle.

[0014] With the above structure, it can be avoided that after the anchor rod is installed on the bridge abutment through the tensioning device, there is a radial shear force at the part where the cable is connected to the anchor rod, which reduces the service life of the cable, affects the service life and safety of the entire bridge.

[0015] Preferably, perfusion holes penetrating the inside and outside are further provided on the side wall of the positioning ring and / or the sleeve.

[0016] With the above structure, the tensioning device can be filled with mortar, further improving the firmness after the cable installation.

[0017] Preferably, the load detection module is a Wheatstone bridge and is arranged in the saddle to detect the pressure on the saddle.

[0018] With the above structure, the cost of the load detection module is relatively low, and the detection result is relatively accurate, making it easier for the construction of the suspension bridge to meet the acceptance standards.

[0019] To achieve the above object, the present invention also provides the following technical solutions: A suspension bridge includes the above-mentioned abutment anchor system, and further includes a beam body, two abutments arranged on both sides of the river channel and used to support both ends of the beam body, a cable connecting the anchor rods on the two abutments, and a support member connecting between the bottom of the beam body and the cable; the support member includes a triangular frame and a connecting beam arranged on the top edge of the triangular frame, and the corner of the triangular frame away from the connecting beam is rotatably connected to the cable.

[0020] With the above structure, the overall construction of the suspension bridge is more convenient.

[0021] Preferably, there are two triangular frames, and the two triangular frames are rotatably hinged together in an overlapping manner, and the connecting beam is rotatably connected to the top edge of the triangular frame.

[0022] With the above structure, not only can the support member be prefabricated and produced in a standardized and modular manner, but also the load performance of the suspension bridge is improved.

[0023] Preferably, the two triangular frames are rotatably connected at the corners close to the cable.

[0024] With the above structure, the structural strength of the support member after installation as a whole is improved, and the construction cost is lower, which is applicable to bridges with larger spans and / or bridges with stronger winds.

[0025] Preferably, the two triangular frames are rotatably connected on the side close to the connecting beam.

[0026] With the above structure, the structural strength of the support member after installation as a whole is improved, and the maintenance cost is also lower, which is more applicable to small urban bridge projects in seismic areas with high requirements for construction efficiency such as economic priority.

[0027] Preferably, a blind hole is further provided on the side of the abutment away from the saddle, one end of the sleeve is located on the side of the abutment close to the saddle, and the other end of the sleeve is located in the blind hole.

[0028] With the above structure, the tensioning device, the anchor rod and the sleeve can all be integrally and hiddenly cast in the bridge abutment, which improves the firmness of the cable and reduces the impact of corrosion at the same time.

[0029] To achieve the above object, the present invention also provides the following technical solutions: A construction method for a suspension bridge, applied to the above suspension bridge, comprising the following steps: S1: Driving piles on both sides of the river; S2: Installing the precast bridge abutment on the piles, wherein the bridge abutment includes a precast sleeve; S3: Installing the saddle on the bridge abutment, and passing the anchor rod at one end of the cable through the sleeve and then fixing it on one of the bridge abutments by screwing on the positioning ring; S4: Passing the anchor rod at the other end of the cable through the sleeve in the other bridge abutment; S5: By adjusting the relative position of the anchor rod in the sleeve, the pressure on the saddle exerted by the cable reaches the preset load, and the cable is fixed by screwing the positioning ring on the anchor rod; S6: Moving the prefabricated support member to the preset position by a tower crane and completing the connection between the support member and the cable. After each group of connections between the support member and the cable is completed, the beam body is installed on the support member.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows: With a relatively simple structure and a simple construction method, it is easy to adjust the cable to the designed sag during the construction of the cable, which is conducive to subsequent construction, and can avoid increasing costs and construction periods due to problems such as trimming and rework, thus affecting delivery. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is an installation schematic diagram of a bridge abutment type anchor system proposed by the present invention; Figure 2 It is a design drawing of an existing suspension bridge; Figure 3 It is a three-dimensional structure schematic diagram of a bridge abutment type anchor system proposed by the present invention; Figure 4 It is a three-dimensional structure schematic diagram of a support member in a suspension bridge proposed by the present invention; Figure 5 It is a three-dimensional structure schematic diagram of another embodiment of a support member in a suspension bridge proposed by the present invention.

[0032] In the figure: 1, abutment; 11, blind hole; 2, anchor rod; 3, cable; 4, cable saddle; 5, tensioning device; 51, sleeve; 52, positioning ring; 53, pouring hole; 6, load detection module; 7, beam body; 8, support member; 81, triangular frame; 82, connecting beam. Detailed implementation mode

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0034] Embodiment 1: Please refer to Figures 1-3 , the present invention provides the following technical solutions: A bridge abutment anchor system includes an anchor rod 2 fixedly connected in the abutment 1 and a cable saddle 4 on the abutment 1 for supporting the cable 3; It further includes a tensioning device 5 for adjusting the length of the cable 3 and a load detection module 6 provided on the cable saddle 4. The force of the cable 3 on the cable saddle 4 is detected by the load detection module 6, and the length of the cable 3 is adjusted by the tensioning device 5 so that the sag of the cable 3 meets the preset load requirement.

[0035] As an optional implementation scheme of the present invention, when the bridge is designed, since the width of the river channel and the distance between the two abutments 1 are determined, the span of the bridge and the height, quantity and distribution position of the support members 8 are also determined. Therefore, the length selection of the cable 3 and the sag of the cable 3 are also determined when the design is completed. Therefore, the pressure of the cable 3 on the two cable saddles 4 at both ends can also be directly calculated. Then, the construction personnel can first pour and fix the two anchor rods 2 in the abutments 1 at both ends respectively, and then adjust the length of the cable 3 through the tensioning device 5. When the load detection module 6 detects that the pressure on the cable saddle 4 reaches the preset value, the adjustment is stopped; or first fix one end of the anchor rod 2, and when the sag of the cable 3 is adjusted to meet the design requirements, the cable 3 and the anchor rod 2 are poured and fixed.

[0036] The advantage of such construction is that it does not break the original inertial engineering thinking of the construction personnel. The cable 3 with a length slightly longer than the designed length can be used to avoid waste of consumables and transportation costs caused by the slightly shorter length of the prefabricated cable 3 during actual construction. At the same time, the length can be adjusted to make the sag of the cable 3 meet the design requirements, so that it is easy to meet the acceptance standards, and there is no need for cutting, eliminating the factor of round-trip work during the construction process.

[0037] For the tensioning device 5, it can be located in the span of the cable 3 or at both ends of the cable 3. The specific structure of the tensioning device 5 can be the nut-screw adjustment method or other existing adjustment methods. For the load detection module 6, it can directly be a load cell for measuring the vertical load or a tension sensor for measuring the lateral tension. In this technical solution, no specific limitation is made in this regard. It should be understood that any method that can achieve the function of adjusting the length of the cable 3 and detecting the load of the cable 3 to calculate that the sag of the cable 3 meets the design requirements belongs to the protection scope of the tensioning device 5 and the load detection module 6.

[0038] Through the above structure, with a relatively simple structure and a simple construction method, it is easy to adjust the cable 3 to the designed sag during the construction of the cable 3, which is conducive to subsequent construction operations, and can avoid increasing costs and construction periods due to problems such as trimming and rework, thus affecting delivery.

[0039] As Figure 3 shown, the outer surfaces of the anchor rods 2 are all provided with threads. The tensioning device 5 includes a sleeve 51 fixedly connected to the abutment 1 and a positioning ring 52 threadedly engaged with the anchor rod 2. The diameter of the cable 3 , the outer diameter of the anchor rod 2 , the caliber of the sleeve 51 and the outer diameter of the positioning ring 52 are: D ≤ < < .

[0040] As an optional embodiment of the present invention, the anchor rod 2 can directly pass through the sleeve 51. When the load detection module 6 on the saddle 4 detects that the pressure received reaches the preset value, the positioning ring 52 is screwed onto the end of the anchor rod 2 extending out of the sleeve 51, and the positioning ring 52 is made to fit the end face of the sleeve 51, thereby completing the fixation of the sag of the cable 3. Subsequently, the entire saddle 4, sleeve 51, and anchor rod 2 are cast and fixed on the abutment 1. The advantage of designing the tensioning device 5 in this way is that the tensioning device 5 on the abutment 1 is easier to adjust and fix compared to on the span of the cable 3, and the casting and fixing method is also more firm, not prone to loosening, does not require frequent inspection and maintenance, and at the same time, there is no need for materials with higher strength and tensile resistance to manufacture the tensioning device 5. The structure is also more concise and the cost is lower.

[0041] Through the above structure, a tensioning device 5 that is easy to construct and operate and reduces the maintenance difficulty is constructed, making the construction of the cable 3 more convenient, and the structure is relatively simple and has more advantages in terms of manufacturing cost.

[0042] As Figure 3As shown, the sleeve 51 is cast in the abutment 1 and the length direction of the sleeve 51 is aligned with the tangent direction of the saddle 4.

[0043] As an alternative embodiment of the present invention, although most of the current saddles 4 are customized, they are basically arc-shaped to reduce the shear force on the cable 3. However, if the length direction of the sleeve 51 cannot be aligned with the tangent direction of the saddle 4, it will cause a radial shear force at the connection part of the cable 3 and the anchor rod 2, which will affect the service life of the cable 3.

[0044] With the above structure, it is possible to avoid the radial shear force at the connection part of the cable 3 and the anchor rod 2 after the anchor rod 2 is installed on the abutment 1 through the tensioning device 5, which reduces the service life of the cable 3 and affects the service life and safety of the entire bridge.

[0045] As Figure 3 shown, a perfusion hole 53 penetrating inside and outside is further provided on the side wall of the positioning ring 52 and / or the sleeve 51.

[0046] As an alternative embodiment of the present invention, the perfusion hole 53 can be used for injecting mortar to seal the gap between the sleeve 51 and the anchor rod 2. After the mortar solidifies, the anchor rod 2 is completely fixed in the sleeve 51, enhancing the firmness of the cable 3 and thus improving the load-bearing performance of the present anchor system for the beam body 7.

[0047] With the above structure, the tensioning device 5 can be filled with mortar to further enhance the firmness of the cable 3 after installation.

[0048] As Figures 2-3 shown, the load detection module 6 is a Wheatstone bridge and is arranged in the saddle 4 to detect the pressure on the saddle 4.

[0049] As an alternative embodiment of the present invention, the Wheatstone bridge is a widely used force sensor in various fields. The advantage of adopting this method in this technical solution is that the detection result is very accurate, which can reduce the load measurement error, ensure that the final determined sag of the cable 3 meets the design requirements, and thus improve the overall performance of the bridge. Moreover, the cost is not high, it can be directly used with a reading device, and the reading device can be removed after use, reducing the consumable cost after casting and burying.

[0050] With the above structure, the cost of the load detection module 6 is relatively low and the detection result is relatively accurate, making the construction of the suspension bridge easier to meet the acceptance standards.

[0051] Embodiment 2: Please refer to Figure 1 And Figures 4-5The present invention provides the following technical solutions: a suspension bridge, comprising the abutment type anchoring system in Example 1, further comprising a beam body 7, two abutments 1 arranged on both sides of a river channel and used to support both ends of the beam body 7, a cable 3 connecting the anchoring rods 2 on the two abutments 1, and a supporting member 8 connected between the bottom of the beam body 7 and the cable 3; the supporting member 8 comprises a triangular frame 81 and a connecting beam 82 arranged on the top edge of the triangular frame 81, and the corner of the triangular frame 81 away from the connecting beam 82 is rotatably connected to the cable 3.

[0052] As an optional implementation scheme of the present invention, the triangular frame 81 itself has been used as a supporting member 8 in an existing suspension bridge, and the technical solution does not limit the number of triangular frames 81 arranged side by side in each supporting member 8, which can be two or more than two in the prior art. It is worth noting that when the anchoring system in Example 1 is adopted, due to the easy construction performance of the cable 3, it is easier for the construction of the original suspension bridge. After determining the verticality of the cable 3, each supporting member 8 can be installed with a corresponding beam 7.

[0053] The above structure makes the overall construction of the suspension bridge more convenient.

[0054] like Figures 4-5 As shown, the triangular frame 81 includes two triangular frames 81 , which are overlapped and rotatably hinged together, and the connecting beam 82 is rotatably connected to the top edge of the triangular frame 81 .

[0055] As an optional implementation scheme of the present invention, in this technical scheme, the two overlapping triangular frames 81 refer to the overlap on the outer circle contour, and the setting of the rotating hinge point can be the top corner of the side connected to the cable 3, or it can be the connecting beam 82 on the side connected to the beam body 7, to ensure that after construction, the support member 8 serves as a load transfer component between the cable 3 and the beam body 7, and its load transfer performance is stable.

[0056] The advantage of using two overlapping triangular frames 81 as the support member 8 is that, compared with the existing single triangular frame 81 (or two or more triangular frames 81 arranged side by side in a single row), it can open the support members 8 distributed at different sag positions of the cable 3, and then complete the connection between the cable 3 and the beam body 7. Therefore, all the support members 8 can adopt the same standards and specifications. When manufacturing the support member 8, each part in the support member 8 can be made by the same mold and / or processing method. So, there is no longer the drawback that in the construction of existing suspension bridges or cable-stayed bridges, because the parameters and specifications of each support member 8 in the design drawing are different, each support member 8 needs to be made by a separate processing method. Therefore, adopting the scheme of using two overlapping and rotatably hinged triangular frames 81 as the new support member 8 can greatly improve the degree of standardization and modular prefabrication production, so that no matter what kind of suspension bridge is being built later, the support member 8 in this way can be used, and it reduces the impact on the project progress, bridge stability and safety caused by the errors brought about by the independent production of each support member 8.

[0057] In addition, after the support member 8 is opened, it also forms a triangular structure with the cable 3 in the span direction of the suspension bridge. Therefore, compared with the existing support member 8, this support member 8 is more stable in transmitting loads in the horizontal or vertical direction, and has stronger wind and seismic resistance. So it is easier to meet the design life of the suspension bridge (usually 100 years). Then such a suspension bridge (specifically referring to a suspension bridge with no cable-stayed above and only cables 3 arranged under the bridge, with low wind resistance) is easier to be applied to large bridge projects (such as cross-sea bridges, cross-mountain bridges, etc.), improving the feasibility of the current suspension bridge in large bridge projects.

[0058] For a single triangular frame 81, the existing method of arranging multiple triangular frames 81 side by side can also be adopted, and the number is not limited in this technical solution; similarly, the specific rotational connection methods with the beam body 7 and the cable 3 can all adopt the existing ones.

[0059] Through the above structure, not only can the support member 8 be prefabricated and produced in a standardized and modular manner, but also the load performance of the suspension bridge is improved.

[0060] As Figure 4 shown, the two triangular frames 81 are rotatably connected at the corners on the side close to the cable 3.

[0061] As an alternative embodiment of the present invention, as described above, when two overlapping triangular frames 81 are rotatably connected at the apex near the cable 3, the overall structure of the support member 8 actually forms an "inverted pyramid" shape. Therefore, the overall structural performance of the support member 8 is very strong, with better load transmission and longer service life. Moreover, the number of connection points with the cable 3 is fewer, so fewer anti-slip measures are required to ensure the firm connection between the support member 8 and the cable 3, saving the cost of consumables. In addition, its center of gravity is higher, and the wind resistance is naturally lower.

[0062] Through the above structure, the overall structural strength of the support member 8 after installation is improved, and the construction cost is lower, which is applicable to bridges with large spans and / or bridges with strong winds.

[0063] Embodiment 3: Please refer to Figure 1 and Figure 5 The present invention provides the following technical solution: a suspension bridge, including the abutment anchor system in Embodiment 1, further including a beam body 7, two abutments 1 provided on both sides of the river channel and used to support both ends of the beam body 7, a cable 3 connecting the anchor rods 2 on the two abutments 1, and a support member 8 connecting between the bottom of the beam body 7 and the cable 3; the support member 8 includes a triangular frame 81 and a connecting beam 82 provided on the top edge of the triangular frame 81, and the angle of the triangular frame 81 away from the connecting beam 82 is rotatably connected to the cable 3. Wherein, there are two triangular frames 81, and the two triangular frames 81 are rotatably hinged together in an overlapping manner, and the two triangular frames 81 are rotatably connected on the side close to the connecting beam 82.

[0064] As an alternative embodiment of the present invention, compared with the method of "rotatably connecting the two triangular frames 81 at the angle near the cable 3" in Embodiment 2, in this technical solution, by opening the two overlapping triangular frames 81 on the side close to the beam body 7, the rotation node is closer to the bridge deck, with higher personnel accessibility, lower maintenance cost, and it is easier to stay away from the humid environment near the water surface, and the anti-corrosion design cost is also lower; moreover, the upper hinge can better absorb the lateral seismic displacement and reduce the shear force of the bridge tower (the peak acceleration response of the bridge in the seismic area is reduced by 25%).

[0065] Through the above structure, the overall structural strength of the support member 8 after installation is improved, and the maintenance cost is also lower, which is more suitable for small urban bridge projects with high construction efficiency requirements such as seismic areas and economic priority.

[0066] Embodiment 4: As Figure 2 shown, a blind hole 11 is further provided on the side of the abutment 1 away from the cable saddle 4, one end of the sleeve 51 is located on the side of the abutment 1 close to the cable saddle 4, and the other end of the sleeve 51 is located in the blind hole 11.

[0067] As an alternative embodiment of the present invention, the blind hole 11 enables the sleeve 51, as well as the installed anchor rod 2 and tensioning device 5, to be directly cast in the abutment 1, so as to reduce the susceptibility to corrosion and other effects in the exposed environment, and at the same time, the structural stability is stronger.

[0068] Through the above structure, the tensioning device 5, the anchor rod 2 and the sleeve 51 as a whole can be hidden and cast in the abutment 1, improving the firmness of the cable 3 and at the same time reducing the impact brought by corrosion.

[0069] Embodiment 5: The present invention provides the following technical solution: A construction method for a suspension bridge, applied to the suspension bridge in Embodiments 2-3, includes the following steps: S1: Drive piles on both sides of the river. S2: Install the precast abutment 1 on the piles, and the abutment 1 therein includes a pre-cast sleeve 51. S3: Install the saddle 4 on the abutment 1, and pass one end of the cable 3 through the sleeve 51 of the anchor rod 2, and then fix it on one of the abutments 1 by screwing on the positioning ring 52. S4: Pass the anchor rod 2 at the other end of the cable 3 through the sleeve 51 in the other abutment 1. S5: By adjusting the relative position of the anchor rod 2 in the sleeve 51, the pressure on the saddle 4 exerted by the cable 3 reaches the preset load, and the cable 3 is fixed by screwing the positioning ring 52 on the anchor rod 2. S6: Move the prefabricated support member 8 to the preset position by a tower crane, and complete the connection between the support member 8 and the cable 3. After each group of connections between the support member 8 and the cable 3 is completed, the beam body 7 is installed on the support member 8.

[0070] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. An abutment anchoring system, comprising an anchoring rod fixedly connected to the abutment and a cable saddle on the abutment for supporting cables, characterized in that: It also includes a tensioning device for adjusting the length of the cable and a load detection module arranged on the saddle, through which the load detection module detects the force of the cable on the saddle, and the length of the cable is adjusted by the tensioning device so that the sag of the cable reaches the preset load requirement.

2. The abutment anchorage system according to claim 1, characterized in that: The outer surface of the anchor rod is provided with threads. The tensioning device includes a sleeve fixedly connected to the abutment and a positioning ring matched with the thread of the anchor rod. The diameter of the cable is , the outer diameter of the anchor rod , the diameter of the sleeve The outer diameter of the locating ring =D≤ < < .

3. The abutment anchorage system according to claim 2, characterized in that: The sleeve is cast in the abutment and the length direction of the sleeve is aligned with the tangent direction of the saddle.

4. The abutment anchorage system according to claim 2, characterized in that: The side wall of the positioning ring and / or the sleeve is also provided with a perfusion hole penetrating inside and outside.

5. The abutment anchorage system according to claim 1, characterized in that: The load detection module is a Wheatstone bridge and is arranged in the saddle to detect the pressure on the saddle.

6. A suspension bridge, comprising the abutment anchoring system according to any one of claims 1 to 5, further comprising a beam, two abutments arranged on both sides of a river channel and used to support both ends of the beam, a cable connecting the anchoring rods on the two abutments, and a supporting member connected between the bottom of the beam and the cable, characterized in that: The supporting member comprises a triangular frame and a connecting beam arranged on the top edge of the triangular frame, and a corner of the triangular frame away from the connecting beam is rotatably connected to the cable.

7. A suspension bridge according to claim 6, characterized in that: The triangular frames include two, the two triangular frames are overlapped and rotatably hinged together, and the connecting beam is rotatably connected to the top edge of the triangular frame.

8. A suspension bridge according to claim 7, characterized in that: The two triangular frames are rotatably connected at a corner close to one side of the cable.

9. The suspension bridge according to claim 7, characterized in that: The two triangular frames are rotatably connected at one side close to the connecting beam.

10. A suspension bridge construction method, applied to the suspension bridge according to any one of claims 7 to 9, characterized in that: The following steps are involved: S1: Drive pile foundations on both sides of the river; S2: installing the prefabricated abutment on a pile foundation, wherein the abutment comprises a precast sleeve; S3: installing the cable saddle on the abutment, passing the anchor rod at one end of the cable through the sleeve, and then fixing it on one of the abutments by screwing on a positioning ring; S4: Passing the anchor rod at the other end of the cable through a sleeve in another abutment; S5: adjusting the relative position of the anchor rod in the sleeve so that the pressure of the cable on the saddle reaches a preset load, and fixing the cable by screwing the positioning ring on the anchor rod; S6: The prefabricated supporting members are moved to a preset position by a tower crane, and the connection between the supporting members and the cables is completed, wherein the beam body is installed on the supporting members after each set of connection between the supporting members and the cables is completed.

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