Anchor cable force intelligent regulation and control system of self-adaptive anchorage suspension bridge

Abstract

The invention relates to the technical field of bridges, in particular to an intelligent anchor cable force regulation and control system of a self-adaptive anchorage suspension bridge. According to the technical scheme, the cable force self-adaption adjusting system comprises a jack, an external anchor rod, a servo motor, a screwing gear, an adjustable bolt and a sensor set, the servo motor is fixedly installed on the side portion of the jack, the screwing gear is fixedly installed at the position of an output shaft of the servo motor, the external anchor rod is fixedly installed at the bottom end of a spiral lead screw of the jack, and the adjustable bolt is fixedly installed at the bottom end of the spiral lead screw of the jack. The adjustable bolt is fixedly installed on a rod body of the external anchor rod, the screwing gear is connected with the adjustable bolt in a meshed mode, and the sensor set is electrically connected with the jack. According to the method, the influence of the temperature effect is counteracted by adjusting the pulling force of the sling and changing the vertical concentrated load acting on the anchor cable, so that the horizontal pulling force of the anchor cable is kept within an allowable range, and different pulling forces are applied to the anchor cable under different temperature conditions.

Description

Technical Field

[0001] The invention relates to the technical field of bridges, and in particular to an intelligent control system for anchor cable force of a self-adaptive anchored suspension bridge. Background Art

[0002] According to the different anchoring forms of the main cable, suspension bridges can usually be divided into two types: ground-anchored and self-anchored. If the ground-anchored and self-anchored suspension bridges are combined, a new type of suspension bridge structure can be formed - the adaptive anchored suspension bridge. The adaptive anchored suspension bridge is a new type of suspension bridge in which the anchor and stiffening beam jointly bear the tension of the main cable. It fully utilizes the compressive capacity of the stiffening beam and reduces the anchor scale and its stringent requirements on geological conditions.

[0003] When designing an adaptive anchored suspension bridge, the requirements for the anchorage scale and the compressive bearing capacity of the stiffening beam are determined by the distribution ratio of the main cable tension, which is achieved by the anchor cables anchored between the anchorage and the stiffening beam.

[0004] In an adaptive anchored suspension bridge, the length of the stiffening beam changes due to temperature changes, which will cause the cable force of the anchor cable to relax or be over-tensioned, creating a safety hazard. Summary of the invention

[0005] The purpose of the present invention is to address the problem in the background technology that the cable force of the anchor cable changes due to temperature effects, and to propose an intelligent control system for the anchor cable force of a self-adaptive anchor suspension bridge.

[0006] The technical solution of the present invention is: an intelligent control system for anchor cable force of an adaptive anchor suspension bridge, comprising an anchor and a stiffening beam, an anchor cable is fixedly installed between the anchor and the stiffening beam, an arc-shaped cable clamp is arranged in the middle of the anchor cable, and a sling is fixedly installed at the bottom of the arc-shaped cable clamp;

[0007] A cable force adaptive adjustment system comprises a jack, an external anchor rod, a servo motor, a twisting gear, an adjustable bolt and a sensor group, wherein the servo motor is fixedly installed on the side of the jack, the twisting gear is fixedly installed at the output shaft of the servo motor, the jack adopts a through-type jack, the sling passes through the through-type jack and is connected to the external anchor rod, the adjustable bolt is fixedly installed at the rod body of the external anchor rod, the twisting gear is meshed and connected with the adjustable bolt, and the sensor group is electrically connected to the jack;

[0008] Optionally, the sensor group includes a pressure sensor and a temperature sensor, the pressure sensor is fixedly installed between the jack and the adjustable bolt, and the temperature sensor is fixedly installed on the side of the jack.

[0009] Optionally, the pressure sensor and the temperature sensor are both electrically connected to the servo motor through a controller, and the pressure sensor and the temperature sensor are both electrically connected to the jack through the controller.

[0010] Optionally, a rigid floor is provided between the anchor and the stiffening beam, a through hole is reserved in the middle of the rigid floor, the sling passes through the rigid floor and is connected to the cable force adaptive adjustment system, a high damping rubber pad is provided between the sling and the rigid floor, and the jack is embedded in the rigid floor.

[0011] Optionally, two symmetrically arranged expanded anchor rods are fixedly installed at the bottom of the rigid floor, and the two expanded anchor rods are deeply buried underground.

[0012] Optionally, the arc-shaped cable clamp includes a left semi-ring body, a middle partition and a right semi-ring body, and the left semi-ring body, the middle partition and the right semi-ring body are connected by bolts at the top and the bottom to form an annular structure, and the anchor cable is divided into left and right parts and passes through the arc-shaped cable clamp.

[0013] Optionally, the overall bending radius of the arc-shaped cable clamp is greater than 30 times the diameter of the anchor cable, and the annular structure formed by the left half ring body and the right half ring body is connected to the sling via a joint bearing.

[0014] Optionally, an arc-shaped groove is opened on the side of the middle partition, and zinc is sprayed in the arc-shaped groove with a thickness of 0.8 to 1.0 mm. The middle partition, the left semi-ring body and the right semi-ring body clamp the anchor cable.

[0015] Optionally, a support is fixedly installed at the bottom of the stiffening beam, the height of the stiffening beam is higher than the height of the anchor, the anchor cable is in an inclined state, and a pressure transmitter is provided in the anchor cable.

[0016] Optionally, the anchor cable is anchored in the anchor after being loosened through a loose cable saddle, and the anchor cable is connected to the stiffening beam through a self-lubricating spherical bearing.

[0017] Compared with the prior art, the present invention has at least one of the following beneficial technical effects:

[0018] In the present invention, by adjusting the tension of the sling, the magnitude of the vertical concentrated load acting on the anchor cable is changed to offset the influence of temperature, so that the horizontal tension of the anchor cable is kept within the allowable range, thereby applying different tensions to the anchor cable under different temperature conditions.

[0019] Furthermore, when a concentrated force is applied to the anchor cable through the sling to generate the expected horizontal tension in the anchor cable, the magnitude of the sling force required to be applied is approximately proportional to the span ratio of the anchor cable, and a smaller sling force can generate a larger tension in the anchor cable.

[0020] Furthermore, compared with controlling the anchor cable force by directly tensioning the anchor cable, the concentrated force required to be applied when indirectly adjusting the anchor cable force by the sling is smaller, and the displacement stroke of the force application point is also larger, making it easier to achieve precise control of the anchor cable force. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of an adaptive anchored suspension bridge;

[0022] Figure 2 This is a schematic diagram of the intelligent control system for anchor cable force;

[0023] Figure 3 It is a schematic diagram of the cross section of the arc-shaped cable clamp;

[0024] Figure 4 It is a schematic diagram of the cable force adaptive adjustment system;

[0025] Figure 5 The relationship between the cable force and the span ratio in the embodiment;

[0026] Figure 6 The graph shows the relationship between the concentrated force increment and the span ratio under the action of overall temperature rise and fall in the embodiment.

[0027] Figure numerals: 10, anchor; 11, stiffening beam; 12, anchor cable; 13, loose cable saddle; 14, self-lubricating spherical bearing; 15, arc-shaped cable clamp; 150, left half ring; 151, middle partition; 152, right half ring; 16, sling; 17, cable force adaptive adjustment system; 170, jack; 171, external anchor rod; 172, servo motor; 173, turning gear; 174, adjustable bolt; 175, pressure sensor; 176, temperature sensor; 18, rigid floor; 19, expanded anchor rod. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0029] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0030] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Example

[0034] An intelligent control system for anchor cable force of an adaptive anchored suspension bridge, such as Figure 1 and Figure 2 As shown, it includes an anchor 10 and a stiffening beam 11, an anchor cable 12 is fixedly installed between the anchor 10 and the stiffening beam 11, an arc-shaped cable clamp 15 is provided in the middle of the anchor cable 12, and a sling 16 is fixedly installed at the bottom of the arc-shaped cable clamp 15. The cable force of the anchor cable 12 in the adaptive anchor suspension bridge is adjusted by the sling 16 connected to the anchor cable 12.

[0035] A support is fixedly installed at the bottom of the stiffening beam 11. The height of the stiffening beam 11 is higher than that of the anchor 10. The anchor cable 12 is in an inclined state. A pressure transmitter is provided in the anchor cable 12 to monitor the change of the anchor cable force in real time. The anchor cable 12 is anchored in the anchor 10 after being spread through the spread cable saddle 13. In order to meet the rotation requirements of the anchor cable 12 when adjusting the cable force, the anchor cable 12 and the stiffening beam 11 are connected through a self-lubricating spherical bearing 14.

[0036] like Figure 2 and Figure 4As shown, a cable force adaptive adjustment system 17 is provided at the end of the sling 16, and the cable force adaptive adjustment system 17 includes a jack 170 and a sensor group. The jack 170 adopts a through-type jack, and the sling 16 passes through the jack 170 and is connected to an external anchor rod 171. The sensor group includes a pressure sensor 175 and a temperature sensor 176. The pressure sensor 175 is fixedly installed between the jack 170 and the adjustable bolt 174, and the temperature sensor 176 is fixedly installed on the side of the jack 170. The pressure sensor 175 and the temperature sensor 176 are both electrically connected to the jack 170 through a controller.

[0037] According to the monitoring values ​​of the pressure sensor 175 and the temperature sensor 176, the tension of the sling 16 is adjusted by the extension and contraction of the jack 170. The tension of the anchor cable 12 is adjusted by the sling 16, and the tension of the sling 16 is intelligently adjusted by the cable force adaptive adjustment system 17, so the tension of the anchor cable 12 can be indirectly adjusted by the cable force adaptive adjustment system 17.

[0038] like Figure 2 and Figure 4 As shown, the cable force adaptive adjustment system 17 also includes an external anchor rod 171, a servo motor 172, a twisting gear 173 and an adjustable bolt 174. The servo motor 172 is fixedly installed on the side of the jack 170, the twisting gear 173 is fixedly installed at the output shaft of the servo motor 172, the adjustable bolt 174 is fixedly installed at the rod body of the external anchor rod 171, the twisting gear 173 is meshed and connected with the adjustable bolt 174, and the sensor group is electrically connected to the jack 170. The pressure sensor 175 and the temperature sensor 176 are both electrically connected to the servo motor 172 through the controller.

[0039] In order to prevent the jack 170 from being in working state for a long time, the servo motor 172 is used to rotate the screw gear 173 to adjust the adjustable bolt 174 set on the external anchor rod 171, so as to ensure that the tension in the sling 16 meets the cable force adjustment requirements and realize the automatic locking and release of the sling 16. The adjustment value of the cable 16 tension is checked by the number of rotations of the screw gear 173. In order to reduce the wear and clearance between the screw gear 173 and the adjustable bolt 174 and ensure the accuracy of the cable force adjustment, the screw gear 173 and the adjustable bolt 174 are made of high-performance steel and high-precision processing technology.

[0040] like Figure 3 As shown, the arc-shaped cable clamp 15 includes a left semi-ring body 150, a middle partition 151 and a right semi-ring body 152. The left semi-ring body 150, the middle partition 151 and the right semi-ring body 152 are connected by bolts at the top and the bottom to form an annular structure. The anchor cable 12 is divided into left and right parts and passes through the arc-shaped cable clamp 15.

[0041] In order to meet the design requirements of the maximum bending angle of the anchor cable 12, the overall bending radius of the arc-shaped cable clamp 15 should be greater than 30 times the diameter of the anchor cable 12. The middle partition 151 is fixedly installed in the middle of the arc-shaped cable clamp 15, and the side of the middle partition 151 is provided with an arc-shaped groove, which is zinc-sprayed with a thickness of 0.8 to 1.0 mm to ensure that there is no relative sliding between the arc-shaped cable clamp 15 and the anchor cable 12 during the cable force adjustment process.

[0042] A rigid floor is arranged between the anchor and the stiffening beam, a through hole is reserved in the middle of the rigid floor, the sling passes through the rigid floor and is connected with the cable force adaptive adjustment system, a high damping rubber pad is arranged between the sling and the rigid floor, and the jack is embedded in the rigid floor.

[0043] like Figure 2 As shown, a rigid floor 18 is provided between the anchor 10 and the stiffening beam 11, a through hole is reserved in the middle of the rigid floor 18, the sling 16 passes through the rigid floor 18 and is connected to the cable force adaptive adjustment system 17, the jack 170 is embedded in the rigid floor 18, and two symmetrically arranged expanded anchor rods 19 are fixedly installed at the bottom of the rigid floor 18, and the two expanded anchor rods 19 are deeply buried underground. In order to reduce the influence of the vibration of the sling 16, a high damping rubber pad is provided between the sling 16 and the rigid floor 18. In order to ensure the stability of the cable force adaptive adjustment system 17, the cable force adaptive adjustment system 17 is embedded in the rigid floor 18.

[0044] The approximate relationship between the cable force of the sling 16 and the horizontal tension of the anchor cable 12 is:

[0045]

[0046] Wherein: P is the cable force of the sling 16; H is the horizontal tension of the anchor cable 12; q is the projection of the deadweight of the anchor cable 12 in the horizontal direction; l is the horizontal length of the anchor cable 12.

[0047]

[0048] Where: α Δt is the linear expansion coefficient of the anchor cable 12 and the stiffening beam 11; Δt is the uniform temperature change; α is the inclination angle of the anchor cable 12; l G is the length of the stiffening beam.

[0049]

[0050] Wherein: n0 is the initial span ratio of the anchor cable 12.

[0051] According to the above-mentioned approximate relationship between the cable force of the sling 16 and the horizontal tension of the anchor cable 12, the tension of the sling 16 can be adjusted more accurately so that the horizontal tension of the anchor cable 12 is always kept within the allowable range.

[0052] Taking a two-tower three-span suspension bridge as an example, the specific values ​​obtained in actual operation are as follows:

[0053] The basic parameters of the suspension bridge are: horizontal span of anchor cable 12 l = 42m, height difference between the two ends of anchor cable 12 h0 = 12m, density of anchor cable 12 ρ c =8200.5kg / m 3 , Anchor cable 12 cross-sectional area A c =0.104m 2 , elastic modulus E of anchor cable 12 c =2.00×10 5 MPa, the initial horizontal tension in the anchor cable 12 is H0 = 1.5 × 10 4 kN; length of stiffening beam 11 l G =596m, cross-sectional area of ​​stiffening beam 11 A G =1.965m 2 , elastic modulus E of stiffening beam 11 G =2.06×10 5 MPa; the linear expansion coefficient of the anchor cable 12 and the stiffening beam 11 is α Δt =12×10 -6 1 / ℃, uniform temperature change Δt=±30℃.

[0054] Substituting the suspension bridge parameters into the approximate relationship between the cable force of the sling cable 16 and the horizontal tension of the anchor cable 12, the relationship between the concentrated force and the span ratio when Δt = 0°C is calculated as follows: Figure 5 shown.

[0055] Depend on Figure 5 and Figure 6 It can be seen that when the suspension bridge parameters are substituted into the approximate relationship expression between the cable force of the sling cable 16 and the horizontal tension of the anchor cable 12, the relationship between the increment and the span ratio when Δt = ±30°C is calculated as follows: Figure 6 shown.

[0056] When Δt=0℃, the magnitude of the concentrated force P is proportional to the span ratio n0. As the span ratio n0 increases, β n gradually increases, and the influence of temperature gradually decreases. Figure 5 and Figure 6 Carry out intelligent adjustment of the cable force of the adaptive anchored suspension bridge cable 16.

[0057] In this embodiment, by adjusting the tension of the sling 16, the magnitude of the vertical concentrated load acting on the anchor cable 12 is changed to offset the influence of the temperature effect, so that the horizontal tension of the anchor cable 12 is kept within the allowable range. When the sling 16 exerts a concentrated force on the anchor cable 12 to generate the expected horizontal tension of the anchor cable 12, the magnitude of the sling force required to be applied is approximately proportional to the anchor cable rise span ratio, and a smaller sling 16 force can generate a larger tension in the anchor cable 12.

[0058] Compared with controlling the cable force by directly tensioning the anchor cable 12, the concentrated force required to indirectly adjust the cable force of the anchor cable 12 through the sling 16 is smaller, and the displacement stroke of the force application point is also larger, making it easier to achieve precise control of the cable force of the anchor cable 12.

[0059] The above specific embodiments are only several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. An intelligent control system for anchor cable force of an adaptive anchor suspension bridge, comprising an anchor (10) and a stiffening beam (11), wherein an anchor cable (12) is fixedly installed between the anchor (10) and the stiffening beam (11), and characterized in that: An arc-shaped cable clamp (15) is provided in the middle of the anchor cable (12), and a sling (16) is fixedly installed at the bottom of the arc-shaped cable clamp (15); A cable force self-adaptive adjustment system (17), comprising a through-type jack (170), an external anchor rod (171), a servo motor (172), a twisting gear (173), an adjustable bolt (174) and a sensor group, wherein the servo motor (172) is fixedly mounted on the side of the through-type jack (170), the twisting gear (173) is fixedly mounted on the output shaft of the servo motor (172), the external anchor rod (171) is fixedly mounted on the bottom end of the spiral screw of the through-type jack (170), the adjustable bolt (174) is fixedly mounted on the shaft of the external anchor rod (171), the twisting gear (173) is meshedly connected with the adjustable bolt (174), and the sensor group is electrically connected to the through-type jack (170); The sling (16) passes through a through-type jack (170) and is connected to an external anchor rod (171).

2. The intelligent control system for anchor force of an adaptive anchored suspension bridge according to claim 1, characterized in that: The sensor group comprises a pressure sensor (175) and a temperature sensor (176); the pressure sensor (175) is fixedly installed between the through-type jack (170) and the adjustable bolt (174); and the temperature sensor (176) is fixedly installed on the side of the jack (170).

3. The intelligent control system for anchor force of an adaptive anchored suspension bridge according to claim 2, characterized in that: The pressure sensor (175) and the temperature sensor (176) are both electrically connected to the servo motor (172) through a controller, and the pressure sensor (175) and the temperature sensor (176) are both electrically connected to the through-type jack (170) through a controller.

4. The intelligent control system for anchor force of an adaptive anchored suspension bridge according to claim 1 is characterized in that: A rigid floor (18) is arranged between the anchor (10) and the stiffening beam (11), the rigid floor (18) has a hole in the middle, the sling (16) passes through the hole in the rigid floor (18), a high damping rubber pad is arranged between the sling (16) and the rigid floor (18), and the jack (170) is embedded in the rigid floor (18).

5. The intelligent control system for anchor force of an adaptive anchored suspension bridge according to claim 4 is characterized in that: Two symmetrically arranged expanded anchor rods (19) are fixedly installed at the bottom of the rigid floor (18), and the two expanded anchor rods (19) are deeply buried underground.

6. The intelligent control system for anchor force of an adaptive anchored suspension bridge according to claim 1, characterized in that: The arc-shaped cable clamp (15) comprises a left half ring body (150), a middle partition plate (151) and a right half ring body (152). The left half ring body (150), the middle partition plate (151) and the right half ring body (152) are connected by bolts at the top and the bottom to form an annular structure. The anchor cable (12) is divided into a left part and a right part and passes through the arc-shaped cable clamp (15).

7. The intelligent control system for anchor force of an adaptive anchored suspension bridge according to claim 6 is characterized in that: The overall bending radius of the arc-shaped cable clamp (15) is greater than 30 times the diameter of the anchor cable (12), and the arc-shaped cable clamp (15) is connected to the sling (16) via a joint bearing.

8. The intelligent control system for anchor force of an adaptive anchored suspension bridge according to claim 7, characterized in that: Arc grooves are formed on both sides of the middle partition plate (151), and zinc is sprayed in the arc grooves to a thickness of 0.8 to 1.0 mm. The middle partition plate (151), the left half ring body (150) and the right half ring body (152) clamp the anchor cable (12).

9. The intelligent control system for anchor force of an adaptive anchored suspension bridge according to claim 1, characterized in that: A support is fixedly mounted at the bottom of the stiffening beam (11), the height of the stiffening beam (11) is higher than the height of the anchor (10), the anchor cable (12) is in an inclined state, and a pressure transmitter is arranged in the anchor cable (12).

10. The intelligent control system for anchor force of an adaptive anchored suspension bridge according to claim 1, characterized in that: The anchor cable (12) is anchored in the anchor (10) after being spread through the spread cable saddle (13); the anchor cable (12) is connected to the stiffening beam (11) via a self-lubricating spherical bearing (14).

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