Balancing device and method for an asymmetrically stressed cantilever

Abstract

The application belongs to the technical field of bridge construction, and discloses a balancing device and method for asymmetrically stressed cantilever beams, which comprises a pressure detection device, a tensioning device and a control device, the pressure detection device is arranged between the outrigger of a hoisting device and the cantilever beam, the control device can receive the transmission signal of the pressure detection device, the tensioning device comprises a tensile beam, a tensioning mechanism and a cable force dynamic tester, the tensioning mechanism comprises a support, a jack connected with the support, a nut assembly and a tightening assembly, and the tensioning mechanism can exert a pulling force on the tensile beam to transmit the pulling force to the cantilever beam for balancing. The balancing method for asymmetrically stressed cantilever beams can cooperate the jack, the nut assembly and the tightening assembly to tension the tensile beam multiple times, avoids using the very difficult-to-control axial force servo system to assist in balancing the cantilever beam, reduces the construction cost, reduces the control difficulty of engineering operation, ensures the construction safety, and greatly improves the construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a balancing device and method for an asymmetric cantilever beam. Background Technology

[0002] In bridge construction, the precast segmental cantilever assembly process has been widely adopted due to its advantages such as minimal environmental impact, reliable quality, fast construction speed, and short construction period. The precast segmental cantilever assembly process involves dividing the main beam of the bridge into several precast segments, which are then transported to the construction site for assembly. (See [link to relevant documentation]). Figure 1 Once the T-shaped structure formed by the lower pier structure 200 and the starting block 300 is completed, the hoisting equipment 100 will hoist the precast beam segments one by one to the end of the T-shaped structure for assembly. The structure formed by multiple precast beam segments is the cantilever beam. The length of the cantilever beam will continue to increase until multiple T-shaped structures are joined together, completing the construction of the entire bridge.

[0003] Precast segmental cantilever assembly technology is divided into symmetrical assembly technology and asymmetrical assembly technology. In actual construction, symmetrical assembly technology is usually used. However, when passing through special terrains such as railways and rivers, asymmetrical assembly technology is required. The asymmetrical forces on the cantilever beam during the construction process of asymmetrical assembly technology are much greater than those during the construction process of symmetrical assembly technology. Therefore, ensuring the balance of the asymmetrically stressed cantilever beam during the construction process of asymmetrical assembly technology is the key to successful construction.

[0004] Patent document ZL201811549814.5 discloses a cantilever assembly construction method for a bridge erecting machine. This method is essentially an "asymmetric stress cantilever assembly method." To balance the forces on both sides of the T-shaped structure, tensile braces are installed below both sides of the starting block, and an automatic axial force servo system is installed below one side of the starting block. By adjusting the tension applied to both sides of the starting block by the tensile braces and adjusting the counter-pressure applied to one side of the starting block by the automatic axial force servo system, the forces on both sides of the cantilever beam are balanced. Patent document ZL201811554818.2 proposes a specific application idea for using tensile braces and an axial force servo system to ensure the balance on both sides of the T-shaped structure when applying the "asymmetric stress cantilever assembly method." However, in practical engineering applications, the cantilever beam balancing device has a complex structure and requires the cooperation of tensile tension and axial force servo systems to balance the cantilever beam. However, the loading and unloading of the axial force servo system needs to be closely integrated with and interspersed with the work procedures, which makes the control steps of the work conditions very complex, greatly increases the control difficulty, brings uncontrollable risks to the safety control of the project, and reduces construction efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a balancing device for asymmetric cantilever beams to solve the problems of complex control steps and high control difficulty when using axial force servo systems in bridge construction.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A balancing device for an asymmetrically stressed cantilever beam, characterized in that it includes a pressure detection device, a tensioning device, and a control device; the pressure detection device is disposed between the outriggers of the hoisting equipment and the cantilever beam; the control device is capable of receiving the transmission signal from the pressure detection device; and the tensioning device includes:

[0008] The tension tension bundle includes a steel wire and a tension rod. The bottom end of the steel wire is fixedly connected to the foundation, and the tension rod is fixedly connected to the top end of the steel wire. The top end of the tension rod passes through the cantilever beam and is threaded with an anchor ring. The tension of the tension tension bundle can be transmitted to the cantilever beam through the anchor ring.

[0009] The tensioning mechanism is connected to the tensioning rod. The tensioning mechanism includes a support and a jack, a nut assembly, and a tightening assembly connected to the support. The support is fixedly connected to the cantilever beam. The nut of the nut assembly is threaded to the upper part of the tensioning rod. The jack is disposed between the support and the nut assembly and can lift the nut upward to apply tension to the tensile bond. The tension of the tensile bond can be transmitted to the cantilever beam through the support. The tightening assembly can drive the anchor ring to move downward along the tensioning rod to tighten the anchor ring.

[0010] A tension dynamic testing instrument is connected to the tension bundle and is used to detect the tension applied by the tension bundle.

[0011] Preferably, the tightening assembly includes a linkage rod, which includes a fixed rod and a sliding rod slidably connected to the fixed rod. The sliding rod is connected to the anchor ring, and the upward movement of the anchor ring can push the sliding rod to retract relative to the fixed rod.

[0012] Preferably, the bottom end of the sliding rod is provided with a first gear, the outer periphery of the anchor ring is provided with a second gear, and both the upper and lower ends of the anchor ring are provided with gear limiting plates. The second gear is disposed between the two gear limiting plates, and the first gear meshes with the second gear.

[0013] Preferably, the linkage further includes a lead screw connected to the fixed rod. The lead screw passes through the fixed rod and the two are connected by a one-way bearing. The lead screw can rotate around its own axis and can move up and down to drive the fixed rod to move.

[0014] Preferably, the lead screw is provided with a limiting nut and a keyed roller. The limiting nut is threadedly connected to the lead screw and fixedly connected to the support. The outer circumferential surface of the lead screw is provided with a groove that extends parallel to the axial direction of the lead screw. The inner wall of the keyed roller is provided with a key that slides with the groove.

[0015] Preferably, the tightening assembly further includes a first motor, which is connected to the key roller via a belt, and the first motor is capable of driving the key roller to rotate around the axis of the lead screw.

[0016] Preferably, the fixed rod is provided with a plurality of sliding grooves, and the sliding rod is provided with a plurality of locking pins, the locking pins slidingly engaging with the sliding grooves.

[0017] Preferably, the tightening assembly is provided in at least two, and the at least two tightening assemblies are evenly spaced around the outer periphery of the anchor ring.

[0018] Preferably, the nut assembly further includes a second motor and a nut sleeve, the nut sleeve being sleeved on the outer periphery of the nut and fixedly connected to the nut, and the second motor being capable of driving the nut sleeve to rotate around the axis of the nut.

[0019] The purpose of this invention is to provide a method for balancing asymmetric cantilever beams to solve the problems of complex control steps and high control difficulty when using axial force servo systems in bridge construction.

[0020] To achieve this objective, the present invention adopts the following technical solution:

[0021] A method for balancing an asymmetrically stressed cantilever beam, employing the balancing device for an asymmetrically stressed cantilever beam as described above, comprising:

[0022] Step 1: The pressure value of the cantilever beam at the support leg is detected in real time by the pressure detection device and recorded as the unbalanced force. The pressure detection device transmits the unbalanced force to the control device.

[0023] Step 2: The control device calculates the balancing force required to maintain the balance of the cantilever beam based on the unbalanced force, and controls the tensioning device to apply the balancing force to the cantilever beam;

[0024] In step 2, the tensioning device applies a balancing force to the cantilever beam, including:

[0025] Step 21: The nut assembly is in the first initial position, the nut is in contact with the telescopic rod of the jack, the anchor ring is in the second initial position, and the anchor ring is pressed against the cantilever beam;

[0026] Step 22: Load the jack and lift the nut upwards, causing the nut assembly, tension rod and anchor ring to move upwards synchronously by the first set distance, applying tension to the steel wire, and the tension on the tension bundle is applied to the cantilever beam through the support;

[0027] Step 23: Tighten the assembly to move the anchor ring down a first set distance, so that the anchor ring returns to the second initial position;

[0028] Step 24: Release the pressure from the jack, and move the nut assembly down the first set distance to return to the first initial position;

[0029] Step 25: Repeat steps 22 to 24 until the tension applied by the tension bundle detected by the cable dynamic tester is greater than or equal to the balancing force; return to step 1.

[0030] Beneficial effects:

[0031] The balancing device for an asymmetric cantilever beam provided by this invention uses a pressure detection device to detect the unbalanced force of the cantilever beam at the supports in real time. The control device calculates the balancing force required to maintain the balance of the cantilever beam based on the unbalanced force and controls the tensioning device to apply the balancing force to the cantilever beam until the tension measured by the cable dynamics tester is greater than or equal to the balancing force, at which point tensioning stops. When the unbalanced force changes, the control device recalculates the balancing force and causes the tensioning device to continue applying the balancing force to the cantilever beam, thus achieving real-time balancing of the cantilever beam.

[0032] In the tensioning device, the tension bundle includes a steel wire and a tension rod. The bottom end of the steel wire is fixed to the foundation, and the top end of the tension rod is fixedly connected to the top end of the steel wire. The top end of the tension rod passes through the cantilever beam and is threadedly connected to an anchor ring, enabling the tension bundle to apply tension to the cantilever beam. Before tensioning, the nut assembly is in a first initial position, and the anchor ring is in a second initial position. During tensioning, the jack, anchor ring, and nut assembly simultaneously move upward a first predetermined distance to apply tension to the tension bundle. The tension of the tension bundle is transmitted to the cantilever beam through the support. After one tensioning cycle, the tightening assembly causes the anchor ring to move downward. The tensioning device returns to the second initial position after the first set distance to fix the tensioned tensile tendon. The tension of the tensile tendon is transmitted to the cantilever beam jack for pressure relief through the anchor ring. The nut assembly moves down the first set distance to return to the first initial position. The tightening assembly is then reset, and the next tensioning can begin. Therefore, the tensioning device can perform multiple tensioning operations, avoiding the need for a difficult-to-control axial force servo system in conjunction with the tensile tendon to balance the cantilever beam. This reduces construction costs, lowers the difficulty of controlling the engineering operation, ensures construction safety, and greatly improves construction efficiency. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the cantilever assembly of existing precast bridge segments;

[0034] Figure 2This is a schematic diagram of the balancing device for an asymmetric cantilever beam provided in this embodiment of the invention during use;

[0035] Figure 3 This is a schematic diagram of the tensioning mechanism provided in an embodiment of the present invention. Figure 1 At this point, the nut assembly is in the first initial position, and the anchor ring is in the second initial position;

[0036] Figure 4 This is a schematic diagram of the tensioning mechanism provided in an embodiment of the present invention. Figure 2 At this time, the nut assembly and the anchor ring move upwards simultaneously by the first set distance;

[0037] Figure 5 This is a schematic diagram of the tensioning mechanism provided in an embodiment of the present invention. Figure 3 At this point, the anchor ring moves down a first set distance and returns to the second initial position;

[0038] Figure 6 This is a schematic diagram of the tensioning mechanism provided in an embodiment of the present invention. Figure 4 The jack was used to release the pressure.

[0039] Figure 7 This is a schematic diagram of the tensioning mechanism provided in an embodiment of the present invention. Figure 5 The nut assembly moves down a first set distance to return to its first initial position;

[0040] Figure 8 This is a schematic diagram of the tensioning mechanism provided in an embodiment of the present invention. Figure 6 At this point, the fixed rod and the lead screw move upward by the first set distance;

[0041] Figure 9 This is a schematic diagram of the tightening assembly and anchor ring provided in an embodiment of the present invention;

[0042] Figure 10 This is a side view of the fixing rod provided in an embodiment of the present invention;

[0043] Figure 11 This is a schematic diagram of the cooperation between the fixed rod and the sliding rod provided in an embodiment of the present invention;

[0044] Figure 12 This is a cross-sectional view of the anchor ring provided in an embodiment of the present invention;

[0045] Figure 13 This is a top view of the limiting nut provided in an embodiment of the present invention;

[0046] Figure 14 This is a top view of the lead screw provided in an embodiment of the present invention;

[0047] Figure 15 This is a cross-sectional view of the connection between the lead screw and the fixed rod provided in an embodiment of the present invention;

[0048] Figure 16 This is a top view of the keyed roller provided in an embodiment of the present invention;

[0049] Figure 17 This is a cross-sectional view of the nut assembly provided in an embodiment of the present invention;

[0050] Figure 18 This is a schematic diagram of the forces acting on a cantilever beam. Figure 1 ;

[0051] Figure 19 This is a schematic diagram of the forces acting on a cantilever beam. Figure 2 .

[0052] In the picture:

[0053] 100 - Lifting equipment; 101 - Outrigger; 200 - Pier structure; 300 - Launching block;

[0054] 1-Tensioning device;

[0055] 11-Tension tension band; 111-Steel wire; 112-Tension rod; 113-Anchor ring; 1131-Gear limiting plate;

[0056] 12-Tensioning mechanism;

[0057] 121-Jack;

[0058] 122-Nut assembly; 1221-Nut; 1222-Second motor; 1223-Nut sleeve;

[0059] 123-Tightening assembly; 1231-Lead screw; 1232-Fixing rod; 1233-Sliding rod; 1234-Limit nut; 1235-Keyed roller; 1236-First motor; 1237-One-way bearing;

[0060] 13-Cable Force Dynamic Measurement Instrument;

[0061] 2-Pressure detection device. Detailed Implementation

[0062] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0063] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0064] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0065] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0066] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0067] See Figure 2 This invention provides a balancing device for an asymmetric cantilever beam, including a pressure detection device 2, a tensioning device 1, and a control device. The pressure detection device 2 is disposed between the outrigger 101 of the hoisting equipment 100 and the cantilever beam. The control device can receive the transmission signal from the pressure detection device 2 and enable the tensioning device 1 to apply tension to the cantilever beam. The tensioning device 1 includes a tensioning tendon 11, a tensioning mechanism 12, and a cable force dynamic measuring instrument 13. The tensioning mechanism 12 enables the tensioning tendon 11 to be tensioned, and the cable force dynamic measuring instrument 13 can detect the tension applied by the tensioning tendon 11.

[0068] Specifically, the control device includes a first control device and a second control device. The first control device is installed on the ground and is wirelessly connected to the pressure detection device 2. The first control device and the second control device are also wirelessly connected. The second control device is installed on the cantilever beam and is electrically connected to the tensioning device 1. The first control device can receive the transmission signal sent by the pressure detection device 2, calculate the balancing force that can balance the cantilever beam, and upload it to the second control device. The second control device can control the tensioning device 1 to perform tensioning based on the data uploaded by the first control device, so that the tensioning device 1 can balance the cantilever beam.

[0069] The tensioning tendon 11 includes a steel wire 111 and a tension rod 112. The bottom end of the steel wire 111 is fixedly connected to the foundation, and the tension rod 112 is fixedly connected to the top end of the steel wire 111. The tensioning mechanism 12 is connected to the tension rod 112. The tensioning mechanism 12 tensions the tensioning tendon 11 by changing the position of the tension rod 112. The connection with the tension rod 112 prevents the components of the tensioning mechanism 12 from being damaged due to direct connection with the steel wire 111. The top end of the tension rod 112 passes through the cantilever beam and is threadedly connected to an anchor ring 113. When the anchor ring 113 abuts against the anchor plate embedded on the surface of the cantilever beam, the anchor ring 113 can fix the stretched steel wire 111 in the current position without retracting, so that the steel wire 111 applies tension to the cantilever beam. When the tensioning mechanism 12 tensions the top of the tension bundle 11, the tension bundle 11 is stretched because the bottom end of the tension bundle 11 is fixed, so that the tension bundle 11 can apply tension to the cantilever beam; the cable force dynamic tester 13 is connected to the tension bundle 11, and the cable force dynamic tester 13 can detect whether the tension applied by the tension bundle 11 can balance the cantilever beam.

[0070] See Figure 3 The tensioning mechanism 12 includes a support and a jack 121, a nut assembly 122, and a tightening assembly 123 connected to the support. The support is fixedly connected to the cantilever beam. The support is used to fix the jack 121, the nut assembly 122, and the tightening assembly 123, and to provide working space for the jack 121, the nut assembly 122, and the tightening assembly 123. The nut 1221 of the nut assembly 122 is threadedly connected to the upper part of the tension rod 112. The jack 121 is located between the support and the nut assembly 122 and can lift the nut 1221 upward to apply tension to the tension tension 11. The tension of the tension tension 11 is transmitted to the cantilever beam through the support. The tightening assembly 123 can drive the anchor ring 113 to move downward along the tension rod 112 to tighten the anchor ring 113. Multiple stretching of the tension tension 11 can be completed through the jack 121, the nut assembly 122, and the tightening assembly 123.

[0071] The specific tensioning process is as follows:

[0072] See Figure 3Before tensioning, nut 1221 is in the first initial position, abutting against the telescopic rod of jack 121; anchor ring 113 is in the second initial position, abutting against anchor plate, thereby tightening the cantilever beam. (See also...) Figure 4 During tensioning, jack 121 is loaded, lifting nut 1221 upwards. This, in turn, causes nut assembly 122, tension rod 112, and anchor ring 113 to move upwards synchronously by a first predetermined distance. At this time, the tension tendon 11 is in a tensioned state, and the tension of the tension tendon 11 is transmitted to the cantilever beam through nut 1221 and jack 121, ultimately via the support. See also... Figure 5 When the tightening assembly 123 is activated, the anchor ring 113 moves down a first predetermined distance, tightening it until it abuts against the anchor plate. The anchor ring 113 then returns to its second initial position. At this point, the tension of the tensile tension beam 11 is transmitted to the cantilever beam through the anchor ring 113 and the anchor plate. (See also...) Figure 6 When jack 121 is depressurized, its extension rod moves down a first predetermined distance. At this point, since anchor ring 113 has returned to its second initial position, it is tightly pressed against the anchor plate, fixing the position of tension tendon 11. Even if jack 121 is depressurized, the tension tendon 11 will not lose its tension on the cantilever beam. See also Figure 7 The nut assembly 122 is activated, causing it to move downwards along the tension rod 112 a first predetermined distance until the nut 1221 contacts the extension rod of the jack 121. At this point, the nut assembly 122 returns to its first initial position. See also... Figure 8 Tightening component 123 is reset. Once tightening component 123 has been reset, the next tensioning can proceed.

[0073] By repeatedly performing the above tensioning process, the tensile tendon 11 can be tensioned multiple times to counteract the constantly changing unbalanced forces on the cantilever beam, avoiding the use of a complex axial force servo system and improving construction efficiency.

[0074] During the tensioning process, the tightening component 123 can drive the anchor ring 113 to move downward along the tensioning rod 112 to tighten the anchor ring 113. At the same time, when the anchor ring 113 moves upward with the jack 121, the tightening component 123 will not interfere with the anchor ring 113.

[0075] See Figure 9The tightening assembly 123 includes a connecting rod, which comprises a fixed rod 1232 and a sliding rod 1233 slidably connected to the fixed rod 1232. The sliding rod 1233 is connected to the anchor ring 113. The fixed rod 1232 has a receiving cavity inside, and one end of the sliding rod 1233 is inserted into the receiving cavity. On the one hand, when the anchor ring 113 moves upward under the action of the jack 121, it can push the sliding rod 1233 to retract relative to the fixed rod 1232, and the sliding rod 1233 will enter the receiving cavity inside the fixed rod 1232. Therefore, the tightening assembly 123 will not interfere with the upward movement of the anchor ring 113. On the other hand, the fixed rod 1232 can rotate around its own axis and can move up and down, while driving the sliding rod 1233 to rotate around its own axis.

[0076] See details Figure 10 and Figure 11 The fixed rod 1232 is provided with multiple sliding grooves, which extend along the axial direction of the fixed rod 1232. The sliding rod 1233 is provided with multiple locking pins, which slide in cooperation with the sliding grooves. When the fixed rod 1232 rotates around its own axis, the locking pins of the sliding rod 1233 abut against the groove wall of the sliding groove of the fixed rod 1232, and the locking pins cause the sliding rod 1233 to rotate simultaneously under the drive of the fixed rod 1232.

[0077] There is no limitation on the number of sliding grooves and locking pins. In this embodiment, two sliding grooves and two locking pins are specifically set. The two sliding grooves are evenly distributed on the surface of the fixed rod 1232 around the axis of the fixed rod 1232, and the two locking pins are evenly distributed on the top of the sliding rod 1233 around the axis of the sliding rod 1233. This makes the fit between the locking pins and the sliding grooves more stable, avoids imbalance, and reduces wear during rotation.

[0078] See Figure 9 and Figure 12 A first gear is provided at the bottom end of the sliding rod 1233, and a second gear is provided on the outer periphery of the anchor ring 113. The teeth of the first gear and the second gear are the same size. Gear limiting plates 1131 are provided at the upper and lower ends of the anchor ring 113. The second gear is located between the two gear limiting plates 1131. When the first gear meshes with the second gear, the first gear is also located between the two gear limiting plates 1131. When the anchor ring 113 moves upward under the action of the jack 121, the gear limiting plate 1131 at the lower end of the anchor ring 113 will abut against the first gear, thereby driving the first gear and the sliding rod 1233 to move upward.

[0079] See Figure 13 and Figure 14The linkage also includes a lead screw 1231 connected to the fixed rod 1232. The lead screw 1231 passes through the fixed rod 1232 and the two are connected by a one-way bearing 1237. The lead screw 1231 can rotate around its own axis and can move up and down to drive the fixed rod 1232 to move. Through the rotation and up and down movement of the lead screw 1231, the tightening action of the anchor ring 113 is completed.

[0080] Specifically, see Figure 15 The bottom end of the lead screw 1231 is provided with a connecting shaft, which is connected to the inner ring of the one-way bearing 1237. The top end of the fixed rod 1232 is provided with a rotating hole, and the side wall of the rotating hole is connected to the outer ring of the one-way bearing 1237.

[0081] The lead screw 1231 is equipped with a limit nut 1234 and a keyed roller 1235. The limit nut 1234 is threadedly connected to the lead screw 1231 and fixedly connected to the support. Because the limit nut 1234 is fixedly connected to the support and threadedly connected to the lead screw 1231, when the lead screw 1231 rotates, it will move up and down simultaneously. A groove is provided on the outer circumferential surface of the lead screw 1231, extending parallel to the axial direction of the lead screw 1231. (See [reference]). Figure 16 The inner wall of the key roller 1235 is provided with a key. The key is slidably connected to the groove. Since the key extends into the groove, when the key roller 1235 rotates, the side wall of the key will abut against the groove wall and drive the lead screw 1231 to rotate.

[0082] Specifically, the threaded engagement between the lead screw 1231 and the limiting nut 1234 is configured such that when the lead screw 1231 rotates around its own axis in a first direction, it moves downwards simultaneously; when the lead screw 1231 rotates around its own axis in a second direction, it moves upwards simultaneously. Since the inner ring of the one-way bearing 1237 can only rotate in one direction relative to the outer ring, it is configured to rotate in the first direction. When the lead screw 1231 rotates in the first direction, the inner ring of the one-way bearing 1237 rotates relative to the outer ring, and the lead screw 1231 rotates in the first direction and moves upwards. The fixed rod 1232 does not rotate and moves upwards with the lead screw 1231. When the lead screw 1231 rotates in the second direction, the inner ring of the one-way bearing 1237 cannot rotate relative to the outer ring, so the fixed rod 1232 is driven by the lead screw 1231 to rotate in the second direction. Both the fixed rod 1232 and the lead screw 1231 rotate in the second direction and move downwards.

[0083] The number of grooves and convex keys is not limited here. In this embodiment, it is specifically set to four grooves and four convex keys. The four grooves are evenly distributed along the axial direction of the lead screw 1231, and the four convex keys are evenly distributed along the axial direction of the convex key roller 1235 on the inner side of the convex key roller 1235. The four convex keys and four grooves slide together, so that the torque is evenly distributed on the four convex keys, avoiding damage caused by excessive torque on a single convex key.

[0084] The tightening assembly 123 also includes a first motor 1236, which is connected to the key roller 1235 via a belt. The first motor 1236 can drive the key roller 1235 to rotate around the axis of the lead screw 1231. By changing the rotation direction of the first motor 1236, the key roller 1235 can drive the lead screw 1231 to rotate in a first direction or a second direction. Since the lead screw 1231 and the limiting nut 1234 are threadedly engaged, when the lead screw 1231 rotates around its own axis, it will move up or down at the same time.

[0085] Furthermore, to prevent the first motor 1236 from driving the lead screw 1231 to rotate in the first direction and move upward beyond the allowable range, a rotary encoder is provided on the first motor 1236. The rotary encoder has a rotation preset value, which is calculated in advance to make the lead screw 1231 and the fixed rod 1232 move upward by a first set distance. When the lead screw 1231 moves upward by the first set distance, the rotary encoder just detects that the first motor 1236 has reached the rotation preset value. At this time, the motor stops rotating to avoid the lead screw 1231 moving beyond the range and damaging the parts.

[0086] Furthermore, the first motor 1236 is also equipped with a first torque limiter. The first torque limiter is set with a first torque safety value. The torque value required to tighten the anchor ring 113 to the anchor plate is calculated in advance or measured by an electronic torque wrench, and this value is used as the first torque safety value of the torque limiter. When the tightening component 123 moves downward under the action of the first motor 1236 until the anchor ring 113 is tightly against the anchor plate and cannot move further downward, the torque acting on the first motor 1236 gradually increases. When the torque is equal to the first torque safety value, the first torque limiter will stop the first motor 1236 from working and the tightening component 123 will stop moving downward, preventing damage to the first motor 1236 and other components due to failure to stop in time.

[0087] See Figure 17The nut assembly 122 also includes a second motor 1222 and a nut sleeve 1223. The nut sleeve 1223 is sleeved on the outer periphery of the nut 1221 and fixedly connected to the nut 1221. The second motor 1222 is connected to the nut sleeve 1223. The second motor 1222 can drive the nut sleeve 1223 to rotate around the axis of the nut 1221. Since the nut 1221 is threadedly connected to the tension rod 112, when the nut sleeve 1223 rotates, it will drive the nut 1221 to move downward together to the first initial position, thus completing the movement of the nut assembly 122.

[0088] Furthermore, a second torque limiter is provided on the second motor 1222. The second torque limiter is set with a second torque safety value. The torque value required to tighten the nut 1221 to the end face of the jack 121 is calculated in advance or measured by an electronic torque wrench, and this value is used as the second torque safety value of the second torque limiter. When the nut 1221 rotates and moves downward under the drive of the nut sleeve 1223 until the nut 1221 is in close contact with the depressurized jack 121, the nut 1221 can no longer rotate and descend. The torque acting on the second motor 1222 increases until it reaches the second torque safety value. The second torque limiter is activated to shut down the second motor 1222, avoiding damage to the second motor 1222 and the threads.

[0089] The general working process of the balancing device for an asymmetric cantilever beam provided in this embodiment of the invention is as follows:

[0090] See Figure 2 The pressure detection device 2 detects the force between the cantilever beam and the support leg 101 and records it as an unbalanced force. The pressure detection device 2 uploads the unbalanced force to the first control device. The first control device calculates the balance force based on the unbalanced force and uploads the balance force to the second control device. The second control device controls the tensioning device 1 to perform tensioning based on the magnitude of the balance force.

[0091] See Figure 3 and Figure 4After receiving the signal, the tensioning device 1 controls the jack 121 to start. Under the action of the jack 121, the nut assembly 122 moves upward from the first initial position by a first set distance. The anchor ring 113 is driven by the nut assembly 122 to move upward from the second initial position by a first set distance. At the same time, the tensioning rod 112 is driven upward by a first set distance, so that the tensile bundle 11 is tensioned. At this time, the nut 1221 abuts against the end face of the hydraulic rod of the jack 121. The nut 1221 fixes the tensioning rod 112 in the tensioned position, so that the tensile bundle 11 is kept in the tensioned state. In order to perform the next tensioning, the process of the jack 121 lifting the nut 1221 needs to be repeated. Therefore, the anchor ring 113 needs to be lowered to the second initial position so that the anchor ring 113 abuts against the anchor plate again to fix the tensile bundle 11, so that the nut assembly 122 and the jack 121 can be reset.

[0092] Specifically, see Figure 9 Since the first gear is limited by the gear limiting plate 1131 on the side of the anchor ring 113, when the anchor ring 113 moves upward, the first gear drives the sliding rod 1233 to move upward together, and the sliding rod 1233 enters the receiving cavity of the fixed rod 1232 from the outside.

[0093] See Figure 5 and Figure 9 The tightening mechanism needs to lower the anchor ring 113 to the second initial position. The first motor 1236 starts and drives the key roller 1235 to rotate in the second direction through the pulley and belt. Since the key of the key roller 1235 is connected to the groove of the lead screw 1231, the key roller 1235 will drive the lead screw 1231 to rotate in the second direction. Since the inner ring of the one-way bearing 1237 connecting the lead screw 1231 and the fixed rod 1232 can only rotate in the first direction relative to the outer ring, the lead screw 1231 will drive the fixed rod 1232 and the sliding rod 1233 to rotate synchronously in the second direction and move downward.

[0094] As the sliding rod 1233 rotates, the first gear at the lower end of the sliding rod 1233 meshes with the second gear at the lower end of the anchor ring 113. Therefore, the anchor ring 113 rotates synchronously under the drive of the sliding rod 1233. The anchor ring 113 is threadedly connected to the tension rod 112, so the anchor ring 113 will move downward along the axial direction of the tension rod 112 while rotating downward. After the anchor ring 113 descends a first set distance, the anchor ring 113 abuts against the anchor plate. As the anchor ring 113 is continuously tightened by the tightening mechanism, the torque acting on the first motor 1236 becomes larger and larger. When the torque acting on the first motor 1236 is equal to the first torque safety value, the first torque limiter set on the first motor 1236 is activated to stop the first motor 1236 from working, and the sliding rod 1233 and the anchor ring 113 no longer descend.

[0095] Specifically, the linkage rod and the anchor ring 113 are configured to move downward at the same speed when rotating, to prevent the sliding rod 1233 and the fixed rod 1232 from having relative displacement, which would affect the subsequent reset action of the lead screw 1231 and the fixed rod 1232.

[0096] See Figure 6 At this time, the anchor ring 113 is tightly abutted against the anchor plate, which restricts the retraction of the tensile tension 11 and fixes the tensile tension 11. At this time, the jack 121 can release pressure, and the piston rod of the jack 121 moves down, causing the nut assembly 122 to separate from the jack 121. In order to perform the next tensioning, the nut assembly 122 needs to be lowered to the first initial position and abutted against the jack 121 again.

[0097] See Figure 7 When the second motor 1222 of the nut assembly 122 is started, the nut sleeve 1223 drives the nut 1221 to rotate axially around the tension rod 112 and move downward. When the nut assembly 122 descends a first set distance, the nut 1221 is in close contact with the end face of the piston rod of the jack 121. As the nut 1221 is continuously tightened by the nut sleeve 1223, the torque acting on the second motor 1222 increases. When the torque acting on the second motor 1222 is equal to the second torque safety value, the second torque limiter set on the second motor 1222 is activated, causing the second motor 1237 to stop working, and the anchor ring 113 stops descending.

[0098] At this time, nut 1221 returns to the first initial position, and anchor ring 113 returns to the second initial position. Since the linkage rod and anchor ring 113 move downward together under the action of the first motor 1236, the sliding rod 1233 in the tightening assembly 123 is still completely in the receiving cavity of the fixed rod 1232. Also, because the anchor ring 113 and sliding rod 1233 are driven upward by the jack 121 during the tensioning of the anti-tensioning tension 11, while the position of the fixed rod 1232 remains unchanged, the sliding rod 1233 needs to move upward into the receiving cavity of the fixed rod 1232. Therefore, the screw 1231 and fixed rod 1232 in the tightening assembly 123 need to be moved upward by a first set distance to the position before tensioning, so that the sliding rod 1233 can fully extend out of the receiving cavity of the fixed rod 1232, providing space for the movement of the sliding rod 1233 during the next tensioning.

[0099] refer to Figure 8When the first motor 1236 of the tightening assembly 123 is started, the first motor 1236 causes the key roller 1235 to rotate around the first direction through the first pulley and the first belt. The lead screw 1231 rotates around the first direction and moves upward under the drive of the key roller 1235. Since the inner ring of the one-way bearing 1237 can move around the first direction relative to the outer ring, the fixed rod 1232 connected to the outer ring of the one-way bearing 1237 will not move around the first direction with the lead screw 1231. However, the fixed rod 1232 will move upward with the lead screw 1231. When the lead screw 1231 moves up a first set distance, the rotary encoder just detects that the first motor 1236 has reached the preset rotation value, and the motor stops rotating. At this time, the sliding rod 1233 just extends completely from the receiving cavity of the fixed rod 1232.

[0100] After completing the above steps, the tensioning device 1 completes the first tensioning. At this time, the cable force dynamic testing instrument 13 will detect the cable force on the tension bundle 11. If the cable force is less than the balancing force, the tension bundle 11 cannot provide enough cable force to balance the cantilever beam. The second control device will cause the tensioning mechanism 12 to perform the next tensioning until the cable force detected by the cable force dynamic testing instrument 13 is greater than or equal to the balancing force, at which point the tensioning mechanism 12 will stop tensioning. When the unbalanced force changes, the first control device will recalculate the balancing force required to balance the cantilever beam and then repeat the above tensioning process until the cable force dynamic testing instrument 13 detects that the cable force on the tension bundle 11 is greater than or equal to the new balancing force.

[0101] This invention also provides a method for balancing an asymmetric cantilever beam, which is accomplished using a balancing device for the asymmetric cantilever beam, including:

[0102] Step 1: The pressure value of the cantilever beam at the support leg 101 is detected in real time by the pressure detection device 2 and recorded as the unbalanced force. The pressure detection device 2 transmits the unbalanced force to the control device.

[0103] Step 2: The control device calculates the balancing force required to maintain the balance of the cantilever beam based on the unbalanced force, and controls the tensioning device 1 to apply the balancing force to the cantilever beam.

[0104] Since it is difficult for the tensioning device 1 to achieve a balanced force on the tensioning tendon 11 in a single tensioning, the tensioning device 1 needs to tension the tensioning tendon 11 multiple times until the force on the tensioning tendon 11 is greater than or equal to the balanced force, at which point the tensioning stops. When the unbalanced force changes, the control device will control the tensioning mechanism 12 to perform multiple tensioning operations in real time according to the constantly changing unbalanced force. This avoids the use of a complex axial force servo system, reduces engineering difficulty, and increases work efficiency.

[0105] In step 1, by setting a pressure detection device 2 between the cantilever beam and the support leg 101, the pressure of the cantilever beam at the support leg 101 can be detected in real time. The pressure detection device 2 transmits the unbalanced force to the first control device. The first control device receives the transmission signal from the pressure detection device 2, calculates the balancing force that can balance the cantilever beam, and uploads it to the second control device.

[0106] Step 2 includes:

[0107] Step 21: Nut assembly 122 is in the first initial position, and anchor ring 113 is in the second initial position.

[0108] See Figure 2 The pressure detection device 2 detects the force between the cantilever beam and the support leg 101 and records it as an unbalanced force. The pressure detection device 2 uploads the unbalanced force to the first control device. The first control device calculates the balance force based on the unbalanced force and uploads the balance force to the second control device. The second control device controls the tensioning device 1 to perform tensioning based on the magnitude of the balance force.

[0109] Step 22: Jack 121 loads the load, causing the nut assembly 122, tension rod 112 and anchor ring 113 to move upward synchronously by a first set distance, applying tension to the steel wire 111. The tension on the tension bundle 11 is applied to the cantilever beam through the support.

[0110] See Figure 3 and Figure 4 After receiving the signal, the tensioning device 1 controls the jack 121 to start. Under the action of the jack 121, the nut assembly 122 moves upward from the first initial position by a first set distance. The anchor ring 113 is driven by the nut assembly 122 to move upward from the second initial position by a first set distance. At the same time, the tensioning rod 112 is driven upward by a first set distance, so that the tensile tension 11 is tensioned. At this time, the nut 1221 abuts against the end face of the hydraulic rod of the jack 121. The nut 1221 fixes the tensioning rod 112 in the tensioned position, so that the tensile tension 11 is kept in the tensioned state at this time.

[0111] Specifically, since the first gear is limited by the gear limiting plate 1131 on the periphery of the anchor ring 113, when the anchor ring 113 moves upward, the first gear drives the sliding rod 1233 to move upward together, and the sliding rod 1233 enters the receiving cavity of the fixed rod 1232 from the outside.

[0112] In order to perform the next tensioning, the process of jack 121 lifting nut 1221 needs to be repeated. Then, anchor ring 113 needs to be lowered to the second initial position so that anchor ring 113 abuts against anchor plate again to fix tensile tension 11, so that nut assembly 122 and jack 121 can be reset.

[0113] Step 23: Anchor ring 113 moves down a first set distance to return to the second initial position.

[0114] See details Figure 5 and Figure 9 The tightening mechanism needs to lower the anchor ring 113 to the second initial position. The first motor 1236 starts and drives the key roller 1235 to rotate in the second direction through the pulley and belt. Since the key of the key roller 1235 is connected to the groove of the lead screw 1231, the key roller 1235 will drive the connecting rod to rotate in the second direction. Since the inner ring of the one-way bearing 1237 connecting the lead screw 1231 and the fixed rod 1232 cannot rotate in the second direction relative to the outer ring, the inner ring will drive the outer ring to rotate together. The lead screw 1231 will drive the fixed rod 1232 and the sliding rod 1233 to rotate synchronously in the second direction and move downward.

[0115] As the sliding rod 1233 rotates, the first gear at the lower end of the sliding rod 1233 meshes with the second gear at the lower end of the anchor ring 113. Therefore, the anchor ring 113 rotates synchronously under the drive of the sliding rod 1233. The anchor ring 113 is threadedly connected to the tension rod 112, so the anchor ring 113 will move downward along the axial direction of the tension rod 112 while rotating downward. After the anchor ring 113 descends a first set distance, the anchor ring 113 abuts against the anchor plate. As the anchor ring 113 is continuously tightened by the tightening mechanism, the torque acting on the first motor 1237 becomes larger and larger. When the torque acting on the first motor 1237 is equal to the first torque safety value, the first torque limiter set on the second motor 1237 is activated, causing the second motor 1237 to stop working, and the anchor ring 113 stops descending.

[0116] Specifically, the linkage rod and the anchor ring 113 are configured to move downward at the same speed when rotating, to prevent relative displacement between the sliding rod 1233 and the fixed rod 1232, and to avoid affecting the subsequent reset action of the lead screw 1231 and the fixed rod 1232.

[0117] Step 24: Jack 121 releases pressure, and nut assembly 122 moves down a first set distance to return to the first initial position;

[0118] See Figure 6 The anchor ring 113 is tightly abutted against the anchor plate, which restricts the retraction of the tensile tension 11 and fixes the tensile tension 11. At this time, the jack 121 is depressurized and the piston rod of the jack 121 moves down, causing the nut assembly 122 to separate from the jack 121. In order to perform the next tensioning, the nut assembly 122 needs to be lowered to the first initial position and abutted against the jack 121 again.

[0119] See Figure 7When the second motor 1222 of the nut assembly 122 is started, the nut sleeve 1223 drives the nut 1221 to rotate around the tension rod axis and move downward. When the nut assembly 122 descends the first set distance, the nut 1221 is in close contact with the end face of the piston rod of the jack 121. As the nut 1221 is continuously tightened by the nut sleeve 1223, the torque acting on the second motor 1222 becomes larger and larger. When the torque acting on the second motor 1222 is equal to the second torque safety value, the second torque limiter set on the second motor 1222 is activated, causing the second motor 1237 to stop working, and the anchor ring 113 stops descending.

[0120] At this time, nut 1221 returns to the first initial position, and anchor ring 113 returns to the second initial position. Since the connecting rod and anchor ring 113 move downward together under the action of the first motor 1237, the sliding rod 1233 in the tightening assembly 123 is completely in the receiving cavity of the fixed rod 1232. Also, because the anchor ring 113 and sliding rod 1233 are driven upward by the jack 121 during the tensioning of the anti-tensioning tension 11, while the position of the fixed rod 1232 remains unchanged, the sliding rod 1233 needs to move upward into the receiving cavity of the fixed rod 1232. Therefore, the screw 1231 and fixed rod 1232 in the tightening assembly 123 need to be moved upward by a first set distance to the position before tensioning, so that the sliding rod 1233 completely exits the receiving cavity of the fixed rod 1232, providing space for the movement of the sliding rod 1233 during the next tensioning.

[0121] See Figure 8 and Figure 9 When the first motor of the tightening assembly starts, the first motor 1236 causes the key roller 1235 to rotate around the first direction through the pulley and belt. The lead screw 1231 rotates around the first direction and moves upward under the drive of the key roller 1235. Since the inner ring of the one-way bearing 1237 can move around the first direction relative to the outer ring, the fixed rod 1232 connected to the outer ring will not move around the first direction with the lead screw 1231. However, the fixed rod 1232 will move upward with the lead screw 1231. When the lead screw 1231 moves up a first set distance, the rotary encoder just detects that the first motor 1236 has reached the preset rotation value, and the motor stops rotating. At this time, the sliding rod 1233 just extends completely from the receiving cavity of the fixed rod 1232.

[0122] Step 25: Repeat steps 22 to 24 until the tension applied by the tension bundle 11 detected by the cable dynamic tester 13 is greater than or equal to the balancing force; return to step 1.

[0123] After completing the above steps, the tensioning device 1 completes the first tensioning. At this time, the cable force dynamic measuring instrument 13 will detect the cable force on the tension bundle 11. If the cable force is less than the balance force, the tension bundle 11 cannot provide enough cable force to balance the cantilever beam. The second control device will cause the tensioning mechanism 12 to perform the next tensioning until the cable force detected by the cable force dynamic measuring instrument 13 is greater than or equal to the balance force, and the tensioning mechanism 12 stops tensioning.

[0124] When the unbalanced force changes, the first control device will recalculate the balancing force required to balance the cantilever beam, and then repeat the above tensioning process until the cable force dynamic tester 13 detects that the cable force on the tension bundle 11 is greater than or equal to the new balancing force.

[0125] This invention provides a method for balancing an asymmetrically stressed cantilever beam, which is achieved using the equilibrium calculation formula for an asymmetrically stressed cantilever beam. See details below. Figure 2 , Figure 18 and Figure 19 ,include:

[0126] The initial cable force applied to the cantilever beam by the two tension tendons 11 is set as T0, the force applied to the cantilever beam by the left tension tendon 11 is set as T1, the force applied to the cantilever beam by the right tension tendon 11 is set as T2, and the distance between the left and right tension tendons 11 and the center of the launching block 300 is L0. The force applied to the cantilever beam by the left support leg 101 is set as F1, and the distance between the left support leg 101 and the center of the launching block 300 is L1. The force applied to the cantilever beam by the right support leg 101 is set as F2, and the distance between the right support leg 101 and the center of the launching block 300 is L2. The counterclockwise moment of the cantilever beam is set as M1, and the clockwise moment of the cantilever beam is set as M2.

[0127] When only one leg 101 on each side of the cantilever beam acts on the cantilever beam, taking the case where only the left leg 101 acts on the cantilever beam while the right leg 101 acts on another pier structure 200 as an example, see [link to example]. Figure 18 Since F1 acts on the cantilever beam, the T-shaped structure formed by the pier structure 200 and the starting block 300 may overturn counterclockwise. Therefore, the right-side tensile tendon 11 needs to be tensioned to balance the force T2 applied to the cantilever beam by the left leg 101, so that M1 = M2.

[0128] Based on the principle of torque balance, the following calculation formula can be established:

[0129] M1=M2→F1×L1+T1×L0=T2×L0→T2=(F1×L1+T1×L0)÷L0

[0130] In the formula, the value of F1 is obtained by pressure detection device 2, and the value of T1 is obtained by cable force dynamic measuring instrument 13.

[0131] At this point, the tension required for a single steel wire 111 is Tn = (T2 - T0) ÷ N, where N is the number of steel wires 111 in the tension bundle 11.

[0132] Because there are some unforeseen circumstances during construction, such as beam segment weight deviation, support leg 101 position deviation, and uncertain distribution of construction resources (such as equipment, materials, and personnel), a certain safety factor needs to be considered when designing the tension of the tension tendon 11. Here, the safety factor is set as K1, which means that the cable force of the single steel wire 111 on the right side when the cantilever beam is balanced is K1*Tn.

[0133] When both sides of the cantilever beam have support legs 101 acting on the cantilever beam, see Figure 19 Based on the principle that "the left tensile tendon 11 is responsible for resisting the clockwise overturning moment of the T-shaped structure, and the right tensile tendon 11 is responsible for resisting the counterclockwise overturning moment of the T-shaped structure," the following calculation formula is established:

[0134] M1=F1×L1=T2×L0→T2=F1×L1÷L0

[0135] M2=F2×L2=T1×L0→T1=F2×L2÷L0

[0136] The values ​​of F1 and F2 in the formula are both measured by the pressure detection device 2.

[0137] At this time, the tension required for a single steel wire 111 of the left tension bundle 11 is T1n = (T2 - T0) ÷ N, and the tension required for a single steel wire 111 of the right tension bundle 11 is T2n = (T1 - T0) ÷ N.

[0138] Because there are some unforeseen circumstances during construction, such as beam segment weight deviation, support leg 101 position deviation, and uncertain distribution of construction resources (such as equipment, materials, and personnel), a certain safety factor needs to be considered when designing the tension of the tension tendon 11. Here, the safety factor is set as K2, that is, the cable force of a single steel wire 111 of the left tension tendon 11 when the cantilever beam is balanced is K2*T1n, and the cable force of a single steel wire 111 of the right side when the cantilever beam is balanced is K2*T2n.

[0139] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A counterbalance for an asymmetrically loaded cantilever beam, characterised in that, The tensioning device (1) comprises a tensioning beam (11) and a tensioning mechanism (12), the tensioning beam (11) is fixedly connected with the cantilever beam, and the tensioning mechanism (12) is connected with the tensioning beam (11). The tensioning beam (11) comprises a steel wire (111) and a tensioning rod (112), the bottom end of the steel wire (111) is fixedly connected with the foundation, the top end of the steel wire (111) is fixedly connected with the tensioning rod (112), the top end of the tensioning rod (112) penetrates through the cantilever beam and is threadedly connected with an anchor ring (113), and the tension of the tensioning beam (11) can be transmitted to the cantilever beam through the anchor ring (113). The tensioning mechanism (12) comprises a support, a jack (121), a nut assembly (122) and a tightening assembly (123), the support is fixedly connected with the cantilever beam, the nut (1221) of the nut assembly (122) is threadedly connected with the upper portion of the tensioning rod (112), the jack (121) is arranged between the support and the nut assembly (122), the jack (121) can upwardly jack up the nut (1221) to apply tension to the tensioning beam (11), the tension of the tensioning beam (11) can be transmitted to the cantilever beam through the support, and the tightening assembly (123) can drive the anchor ring (113) to move downward along the tensioning rod (112) to tighten the anchor ring (113). The cable force dynamic tester (13) is connected with the tensioning beam (11) and is used for detecting the tension applied by the tensioning beam (11).

2. The counterbalance device for an asymmetrically stressed cantilever beam according to claim 1, characterized in that The tightening assembly (123) comprises a linkage rod, the linkage rod comprises a fixed rod (1232) and a sliding rod (1233) which is slidingly connected with the fixed rod (1232), the sliding rod (1233) is connected with the anchor ring (113), and upward movement of the anchor ring (113) can push the sliding rod (1233) to retract relative to the fixed rod (1232).

3. A counterbalance for an asymmetrically loaded cantilever beam according to claim 2, wherein, The bottom end of the sliding rod (1233) is provided with a first gear, the outer periphery of the anchor ring (113) is provided with a second gear, the upper end and the lower end of the anchor ring (113) are both provided with gear limiting plates (1131), the second gear is arranged between the two gear limiting plates (1131), and the first gear is engaged with the second gear.

4. The counterbalance device for an asymmetrically stressed cantilever beam according to claim 2, characterized in that The linkage rod further comprises a lead screw (1231) connected with the fixed rod (1232), the lead screw (1231) is arranged in the fixed rod (1232) and connected with the fixed rod (1232) through a one-way bearing (1237), the lead screw (1231) can rotate around its own axis and can move up and down to drive the fixed rod (1232) to move.

5. A counterbalance for an asymmetrically loaded cantilever beam according to claim 4, wherein, The screw rod (1231) is provided with a limiting nut (1234) and a key roller (1235), the limiting nut (1234) is in threaded connection with the screw rod (1231), the limiting nut (1234) is fixedly connected with the support, and the outer circumferential surface of the screw rod (1231) is provided with a groove extending in parallel to the axial direction of the screw rod (1231); the inner wall of the key roller (1235) is provided with a key in sliding connection with the groove.

6. A counterbalance for an asymmetrically loaded cantilever beam according to claim 5, wherein, The tightening assembly (123) further comprises a first motor (1236) connected with the key roller (1235) through a belt, and the first motor (1236) can drive the key roller (1235) to rotate around the axis of the screw rod (1231).

7. The counterbalance device for an asymmetrically stressed cantilever beam according to claim 2, characterized in that The fixed rod (1232) is provided with a plurality of sliding grooves, and the sliding rod (1233) is provided with a plurality of clamping columns in sliding fit with the sliding grooves.

8. A counterbalance for an asymmetrically loaded cantilever beam according to any one of claims 1 to 7, wherein, The tightening assembly (123) is provided with at least two, and the at least two tightening assemblies (123) are uniformly and spacedly arranged around the outer periphery of the anchor ring (113).

9. A counterbalance for an asymmetrically loaded cantilever beam according to any one of claims 1 to 7, wherein, The nut assembly (122) further comprises a second motor (1222) and a nut sleeve (1223), the nut sleeve (1223) is sleeved on the outer periphery of the nut (1221) and fixedly connected with the nut (1221), and the second motor (1222) can drive the nut sleeve (1223) to rotate around the axis of the nut (1221).

10. A method of balancing an asymmetrically loaded cantilever beam, characterized by, The device comprises: Step 1: real-time detection of the pressure value of the cantilever beam at the support leg (101) by the pressure detection device (2), recorded as the unbalanced force, and transmission of the unbalanced force to the control device by the pressure detection device (2); Step 2: calculation of the balancing force required to keep the cantilever beam balanced by the control device according to the unbalanced force, and control of the tensioning device (1) to apply the balancing force to the cantilever beam; In the step 2, the tensioning device (1) applies the balancing force to the cantilever beam, comprising: Step 21: the nut assembly (122) is located at the first initial position, the nut (1221) is in contact with the telescopic rod of the jack (121), and the anchor ring (113) is located at the second initial position and abuts against the cantilever beam; Step 22: the jack (121) is loaded, the nut (1221) is lifted upward, the nut assembly (122), the tensioning rod (112) and the anchor ring (113) are synchronously moved upward by a first set distance, a pulling force is applied to the steel wire (111), and the pulling force on the tensile beam (11) acts on the cantilever beam through the support; Step 23: the tightening assembly (123) drives the anchor ring (113) to move downward by a first set distance, so that the anchor ring (113) returns to the second initial position; Step 24: the jack (121) is unloaded, and the nut assembly (122) moves downward by a first set distance to return to the first initial position; Step 25: Steps 22 to 24 are repeated until the tensiometer (13) detects a tension applied by the tensile strand (11) that is greater than or equal to the balancing force; return to step 1.

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