CN115369780A - Balance device and method for asymmetric stressed cantilever beam - Google Patents

Abstract

The invention belongs to the technical field of bridge construction, and discloses a balancing device and method for an asymmetrically stressed cantilever beam, including a pressure detection device, a tensioning device and a control device, and the pressure detection device is arranged between the outrigger of the hoisting equipment and the cantilever beam During the period, the control device can receive the transmission signal of the pressure detection device. The tension device includes a tension beam, a tension mechanism and a cable force dynamic tester. The tension mechanism includes a support and a jack connected to the support, a nut assembly and a tightening assembly. , which can be balanced by applying tension to the beam against the beam for transfer to the cantilever beam. The balance method of the asymmetrically stressed cantilever beam, through the cooperation of the jack, the nut assembly and the tightening assembly, can perform multiple tensions on the anti-tension beam, avoiding the use of the axial force servo system which is very difficult to control to assist in balancing the cantilever beam, reducing The construction cost is reduced, the control difficulty of the engineering operation is reduced, the construction safety is ensured, and the construction efficiency is greatly improved.

Description

Balance device and method of asymmetrically stressed cantilever beam

technical field

The invention relates to the technical field of bridge construction, in particular to a balancing device and method for an asymmetrically stressed cantilever beam.

Background technique

In bridge construction, the prefabricated segmental cantilever assembly process has been widely used due to its advantages of low environmental impact, reliable quality, fast construction speed and short construction period. The prefabricated section cantilever assembly process is to divide the main girder of the bridge into several sections for prefabrication, and then transport them to the construction site for splicing. See Figure 1. After the T-shaped structure formed by the lower pier structure 200 and the starting block 300 is completed, The hoisting equipment 100 lifts the prefabricated beam sections to the end of the T-shaped structure one by one for assembly. The structure formed by multiple prefabricated beam sections is a cantilever beam, and the length of the cantilever beam continues to increase until the multiple T-shaped structures are closed. Full bridge construction.

The cantilever assembly process of prefabricated segments is divided into symmetrical assembly process and asymmetrical assembly process. Symmetrical assembly process is usually used in actual construction, but asymmetrical assembly process is required when passing through some special terrains such as railways and rivers. The asymmetric force suffered by the cantilever beam during the construction process of the asymmetric assembly process is much greater than that received by the symmetrical assembly process. Therefore, in the construction process of the asymmetric assembly process, how to ensure the balance of the asymmetrically stressed cantilever beam is the construction The key to success.

Patent document ZL201811549814.5 discloses a construction method for cantilever assembly of a bridge erecting machine, which is essentially an "asymmetrically stressed cantilever assembly method". In order to balance the force on both sides of the T structure, Tensile beams are arranged below, and an axial force automatic servo system is arranged under one side of the originating block, and the tensile force applied on both sides of the originating block by the tension beams is adjusted and the axial force automatic servo system is applied on the The anti-jacking force on one side of the starting block is adjusted to balance the force on both sides of the cantilever beam; Axial force servo system to ensure the balance on both sides of the T-shaped structure puts forward specific application ideas. However, in practical engineering applications, the structure of the cantilever beam balancing device used is complex, and the tension beam and the axial force servo system must cooperate to complete the balance of the cantilever beam. The close combination and interspersed operation lead to very complicated control steps of the operating conditions, which greatly increases the difficulty of control, brings uncontrollable risks to the safety control of the project, and reduces the construction efficiency.

Contents of the invention

The purpose of the present invention is to provide a balance device for an asymmetrically stressed cantilever beam to solve the problem of complicated control steps and high control difficulty when an axial force servo system is used in bridge construction.

For reaching this purpose, the present invention adopts following technical scheme:

A balance device for an asymmetrically stressed cantilever beam, characterized in that it includes a pressure detection device, a tension device and a control device, the pressure detection device is arranged between the legs of the hoisting equipment and the cantilever beam, and the control device Capable of receiving the transmission signal of the pressure detection device, the tension device includes:

Tensile beams, including steel wires and tension rods, the bottom ends of the steel wires are fixedly connected to the foundation, the tension rods are fixedly connected to the top ends of the steel wires, and the top ends of the tension rods pass through the cantilever beams and are screwed to An anchor ring, the tensile force of the tensile beam can be transmitted to the cantilever beam through the anchor ring;

The tensioning mechanism is connected with the tensioning rod, the tensioning mechanism includes a support, a jack connected to the support, a nut assembly and a tightening assembly, the support is fixedly connected with the cantilever beam, and the nut The nut of the assembly is threadedly connected to the upper part of the tension rod, the jack is arranged between the support and the nut assembly and the jack can lift the nut upwards to apply tension to the tension beam, The tensile force of the tensile beam can be transmitted to the cantilever beam through the support, and the tightening assembly can drive the anchor ring to move down the tension rod to tighten the anchor ring;

The cable force dynamic tester is connected with the tension beam and is used to detect the tension exerted by the tension beam.

Preferably, the tightening assembly includes a linkage rod, the linkage rod includes a fixed rod and a sliding rod slidingly connected with the fixed rod, the sliding rod is connected with the anchor ring, and the anchor ring moves upward The sliding rod can be pushed to retract relative to the fixed rod.

Preferably, the bottom end of the sliding rod is provided with a first gear, the outer circumference of the anchor ring is provided with a second gear, the upper end and the lower end of the anchor ring are provided with a gear limiting plate, and the second gear It is arranged between the two gear limiting plates, and the first gear meshes with the second gear.

Preferably, the linkage rod further includes a threaded rod connected to the fixed rod, the threaded rod passes through the fixed rod and is connected by a one-way bearing between the two, and the threaded rod can wind around itself The axis rotates and can move up and down to drive the fixed rod to move.

Preferably, a limit nut and a convex key roller are arranged on the screw rod, the limit nut is threadedly connected with the screw rod, the limit nut is fixedly connected with the support, and the outer circumference of the screw rod A groove is arranged on the surface, and the groove extends parallel to the axial direction of the screw rod. A convex key is arranged on the inner wall of the convex key roller, and the convex key is slidably connected with the groove.

Preferably, the tightening assembly further includes a first motor, the first motor is connected to the cam roller through a belt, and the first motor can drive the cam roller to rotate around the axis of the screw rod.

Preferably, the fixing rod is provided with a plurality of sliding grooves, the sliding rod is provided with a plurality of clamping posts, and the clamping posts are slidably fitted with the sliding grooves.

Preferably, it is characterized in that at least two tightening assemblies are provided, and at least two tightening assemblies are evenly spaced around the outer circumference of the anchor ring.

Preferably, the nut assembly further includes a second motor and a nut sleeve, the nut sleeve is sleeved on the outer periphery of the nut and fixedly connected with the nut, and the second motor can drive The nut sleeve rotates about the axis of the nut.

The purpose of the present invention is to provide a method for balancing an asymmetrically stressed cantilever beam, so as to solve the problem of complicated control steps and high control difficulty when an axial force servo system is used in bridge construction.

For reaching this purpose, the present invention adopts following technical scheme:

A method for balancing an asymmetrically stressed cantilever beam, using the balance device for an asymmetrically stressed cantilever beam as described above, comprising:

Step 1: The pressure value of the cantilever beam at the leg is detected in real time by the pressure detection device, which is recorded as the unbalanced force, and the pressure detection device transmits the unbalanced force to the control device;

Step 2: The control device calculates the balance force required to keep the cantilever beam balanced according to the unbalanced force, and controls the tensioning device to apply a balance force to the cantilever beam;

In the step 2, the tensioning device applies a balanced force to the cantilever beam, including:

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

Step 22: Load the jack, lift the nut upwards, drive the nut assembly, the tension rod and the anchor ring to move up the first set distance synchronously, apply tension to the steel wire, and the tension on the tension beam acts on the cantilever beam through the support;

Step 23: Tighten the assembly to drive the anchor ring down the first set distance, so that the anchor ring returns to the second initial position;

Step 24: The jack releases the pressure, and the nut assembly moves down the first set distance to return to the first initial position;

Step 25: Repeat steps 22 to 24 until the tensile force detected by the cable force dynamic tester is greater than or equal to the balance force; return to step 1.

Beneficial effect:

The balance device of the asymmetrically stressed cantilever beam provided by the present invention detects the unbalanced force of the cantilever beam at the outrigger in real time through the pressure detection device, and the control device calculates the balance force required to maintain the balance of the cantilever beam according to the unbalanced force, And control the tensioning device to apply a balance force to the cantilever beam until the tension measured by the cable force dynamic tester is greater than or equal to the balance force, then stop tensioning. When the unbalanced force changes, the control device will recalculate the balanced force and make the tensioning device continue to apply a balanced force to the cantilever beam, so as to realize the real-time balance of the cantilever beam.

In the tensioning device, the tension beam includes steel wire and tension rod, the bottom end of the steel wire is fixed to the foundation, the tension rod is fixedly connected to the top end of the steel wire, and the top end of the tension rod passes through the cantilever beam and is screwed with an anchor ring, so that the tension beam can be Apply tension to the cantilever beam. Before tensioning, the nut assembly is at the first initial position, and the anchor ring is at the second initial position. When tensioning, the jack, anchor ring, and nut assembly simultaneously move up the first set distance to resist the tension beam Applying tension, the tensile force of the tensile beam is transmitted to the cantilever beam through the support. After a tension is completed, the assembly is tightened to move the anchor ring down the first set distance and return to the second initial position, so as to fix the tensile force. Pull the beam, the tensile force of the tensile beam is transmitted to the cantilever beam jack through the anchor ring to release the pressure, the nut assembly moves down the first set distance and returns to the first initial position, and the tightening assembly resets, that is, the next tensioning can be carried out. Therefore, the tensioning device can perform multiple tensions, avoiding the use of the axial force servo system, which is very difficult to control, and the tension beam to balance the cantilever beam, reducing the construction cost, reducing the control difficulty of engineering operations, and ensuring construction safety. , greatly improving the construction efficiency.

Description of drawings

Fig. 1 is the schematic diagram of existing bridge prefabricated section cantilever assembly;

Fig. 2 is a schematic diagram of the balance device of the asymmetrically stressed cantilever beam provided by the embodiment of the present invention in use;

Fig. 3 is a schematic diagram 1 of the tensioning mechanism provided by the embodiment of the present invention, at this moment, the nut assembly is in the first initial position, and the anchor ring is in the second initial position;

Fig. 4 is a schematic diagram 2 of the tensioning mechanism provided by the embodiment of the present invention, at this time, the nut assembly and the anchor ring move up the first set distance at the same time;

Fig. 5 is a schematic diagram 3 of the tensioning mechanism provided by the embodiment of the present invention. At this time, the anchor ring moves down the first set distance and returns to the second initial position;

Fig. 6 is a schematic diagram 4 of the tensioning mechanism provided by the embodiment of the present invention, the jack releases pressure;

Fig. 7 is a schematic diagram 5 of the tensioning mechanism provided by the embodiment of the present invention, the nut assembly moves down a first set distance and returns to the first initial position;

Fig. 8 is a schematic diagram 6 of the tensioning mechanism provided by the embodiment of the present invention, at this time, the fixed rod and the screw rod are moved up by the first set distance;

Fig. 9 is a schematic diagram of the cooperation between the tightening assembly provided by the embodiment of the present invention and the anchor ring;

Fig. 10 is a side view of the fixing rod provided by the embodiment of the present invention;

Fig. 11 is a schematic diagram of cooperation between the fixed bar and the sliding bar provided by the embodiment of the present invention;

Fig. 12 is a sectional view of the anchor ring provided by the embodiment of the present invention;

Fig. 13 is a top view of a stop nut provided by an embodiment of the present invention;

Fig. 14 is a top view of the screw provided by the embodiment of the present invention;

Fig. 15 is a cross-sectional view of the connection between the screw rod and the fixed rod provided by the embodiment of the present invention;

Fig. 16 is a top view of the convex key roller provided by the embodiment of the present invention;

Fig. 17 is a sectional view of a nut assembly provided by an embodiment of the present invention;

Fig. 18 is a schematic diagram of cantilever beam stress one;

Figure 19 is the second schematic diagram of the force on the cantilever beam.

In the picture:

100-hoisting equipment; 101-outrigger; 200-pier structure; 300-starting block;

1- tensioning device;

11-tension beam; 111-steel wire; 112-tension rod; 113-anchor ring; 1131-gear limit plate;

12-tension mechanism;

121 - Jack;

122-nut assembly; 1221-nut; 1222-second motor; 1223-nut sleeve;

123-tightening assembly; 1231-screw; 1232-fixed rod; 1233-sliding rod; 1234-limit nut; 1235-convex key roller; 1236-first motor;

13-Cable dynamic tester;

2- Pressure detection device.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this embodiment, the terms "up", "down", "right", and other orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operations, rather than indicating Or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first" and "second" are only used to distinguish in description, and have no special meaning.

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

Referring to Fig. 2 , an embodiment of the present invention provides a balance device for an asymmetrically stressed cantilever beam, including a pressure detection device 2, a tension device 1 and a control device. Between the beams, the control device can receive the transmission signal of the pressure detection device 2, and can make the tension device 1 apply tension to the cantilever beam. The tension device 1 includes a tension beam 11, a tension mechanism 12 and a cable force dynamic tester 13 , the tensioning mechanism 12 can make the tensile beam 11 be tensioned, and the cable force dynamic measuring instrument 13 can detect the tension exerted by the tensile beam 11 .

Specifically, the control device includes a first control device and a second control device, the first control device is arranged on the ground, the first control device is wirelessly connected to the pressure detection device 2, and the first control device and the second control device are wirelessly connected, The second control device is arranged on the cantilever beam, and the second control device is electrically connected with the tensioning device 1. The first control device can receive the transmission signal sent by the pressure detection device 2 and calculate the balance force that can balance the cantilever beam and upload it to the second control device. Two control devices, the second control device can control the tension device 1 to perform tension according to the data uploaded by the first control device, so that the tension device 1 can balance the cantilever beam.

Tensile bundle 11 comprises steel wire 111 and tension rod 112, and the bottom end of steel wire 111 is fixedly connected with foundation, and tension rod 112 is fixedly connected with the top of steel wire 111, and tension mechanism 12 is connected with tension rod 112, and tension mechanism 12 passes The position of the tension rod 112 is changed so as to tension the anti-tension beam 11, and the connection with the tension rod 112 can prevent the parts of the tension mechanism 12 from being damaged due to the direct connection with the steel wire 111. The top of the tension rod 112 passes through the cantilever beam An anchor ring 113 is also threaded. When the anchor ring 113 abuts against the anchor plate embedded in the surface of the cantilever beam, the anchor ring 113 can fix the stretched steel wire 111 at the current position without retracting, so that the steel wire 111 is A cantilever beam applies tension. When the tension mechanism 12 stretches the top of the anti-tension beam 11, because the bottom end of the anti-tension beam 11 is fixed, the anti-tension beam 11 is elongated so that the anti-tension beam 11 can apply tension to the cantilever beam; the cable force dynamic measuring instrument 13 Connected with the tension beam 11, the cable force dynamic tester 13 can detect whether the tension exerted by the tension beam 11 can balance the cantilever beam.

Referring to Fig. 3, the tensioning mechanism 12 comprises a support and a jack 121 connected to the support, a nut assembly 122 and a tightening assembly 123, the support is fixedly connected to the cantilever beam, and the support is used to fix the jack 121, the nut assembly 122 and the tightening assembly 123, and 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 with the upper part of the tension rod 112, the jack 121 is arranged between the support and the nut assembly 122 and the jack 121 can be upward Lift the nut 1221 to apply tension to the anti-tension beam 11, the tension of the anti-tension beam 11 is transmitted to the cantilever beam through the support, and the tightening assembly 123 can drive the anchor ring 113 to move down along the tension rod 112 to tighten the anchor ring 113, through the jack 121 , the nut assembly 122 and the tightening assembly 123 can complete multiple stretches against the tension beam 11 .

The specific stretching process is as follows:

Referring to Fig. 3, before tensioning, the nut 1221 is in the first initial position, and the nut 1221 is in contact with the telescopic rod of the jack 121; the anchor ring 113 is in the second initial position, and the anchor ring 113 is in contact with the anchor backing plate, and then tightly cantilever beam. Referring to Fig. 4, during tensioning, the jack 121 is loaded, and the nut 1221 is lifted upwards, thereby driving the nut assembly 122, the tensioning rod 112 and the anchor ring 113 to move up a first set distance synchronously, at this time, the tensile beam 11 is in the state of being pulled. In the state of tension, the tensile force of the tensile bundle 11 is finally transmitted to the cantilever beam by the support through the nut 1221 and the jack 121 . Referring to Fig. 5, the tightening assembly 123 is started to move the anchor ring 113 down a first set distance, so that the anchor ring 113 is tightened to abut against the anchor backing plate, and the anchor ring 113 returns to the second initial position. At this time, the tension beam 11 The pulling force is transmitted to the cantilever beam through the anchor ring 113 and the anchor plate. Referring to Fig. 6, the jack 121 releases the pressure, and the telescopic rod of the jack 121 moves down the first set distance; at this time, since the anchor ring 113 has returned to the second initial position, the anchor ring 113 is tightly abutted against the anchor plate, so that the anti- The position of the tension beam 11 is fixed, even if the pressure of the jack 121 is released, the tensile tension beam 11 will not lose its tension on the cantilever beam. Referring to FIG. 7 , the nut assembly 122 is started, so that the nut assembly 122 moves down a first set distance along the tension rod 112 until the nut 1221 contacts the telescopic rod of the jack 121 , and the nut assembly 122 returns to the first initial position at this time. Referring to FIG. 8 , the tightening assembly 123 is reset, and when the tightening assembly 123 is reset, the next tensioning can be performed at this time.

By repeating the above stretching process, the tensile beam 11 can be stretched multiple times to resist the constantly changing unbalanced force on the cantilever beam, avoiding the use of an axial force servo system with complicated operations, and improving construction efficiency.

During the tensioning process, the tightening assembly 123 can drive the anchor ring 113 to move down along the tension rod 112 to tighten the anchor ring 113 , and the tightening assembly 123 will not interfere with the anchor ring 113 when the anchor ring 113 moves up with the jack 121 .

Referring to Fig. 9, the tightening assembly 123 includes a linkage rod, the linkage rod includes a fixed rod 1232 and a sliding rod 1233 slidingly connected with the fixed rod 1232, the sliding rod 1233 is connected with the anchor ring 113, and the fixed rod 1232 is provided with an accommodating cavity inside, One end of the sliding rod 1233 is inserted into the accommodating 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 accommodating cavity inside the fixed rod 1232, so the tightening assembly 123 will not The interference anchor ring 113 moves upward; on the other hand, the fixed rod 1232 can rotate around its own axis and move up and down, and at the same time drive the sliding rod 1233 to rotate around its own axis.

Referring to Figure 10 and Figure 11 specifically, the fixed rod 1232 is provided with a plurality of sliding grooves, the sliding grooves extend along the axial direction of the fixed rod 1232, and the sliding rod 1233 is provided with a plurality of clamping columns, which are slidably matched with the sliding grooves. When the fixed rod 1232 rotates around its own axis, the clamping column of the sliding rod 1233 abuts against the groove wall of the sliding groove of the fixed rod 1232 , and the clamping column is driven by the fixed rod 1232 to make the sliding rod 1233 rotate simultaneously.

There is no limit to the number of sliding grooves and clamping columns. In this embodiment, two sliding grooves and two clamping columns are specifically arranged. The two sliding grooves are evenly distributed on the surface of the fixing rod 1232 around the axis of the fixing rod 1232. Two clips are evenly distributed around the axis of the slide rod 1233 at the top of the slide rod 1233, so that the cooperation between the clips and the slide groove is more stable, avoiding imbalance and reducing wear during rotation.

Referring to Fig. 9 and Fig. 12, the bottom end of sliding bar 1233 is provided with first gear, and the outer periphery of anchor ring 113 is provided with second gear, and the tooth size of first gear and the tooth of second gear are the same size, and the upper end of anchor ring 113 and The lower end is provided with a gear limiting plate 1131, the second gear is arranged between the two gear limiting plates 1131, when the first gear meshes with the second gear, the first gear is also 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.

Referring to Figure 13 and Figure 14, the linkage rod also includes a screw rod 1231 connected to the fixed rod 1232, the screw rod 1231 is passed through the fixed rod 1232 and connected by a one-way bearing 1237 between the two, the screw rod 1231 can rotate around its own axis Rotate and move up and down to drive the fixed rod 1232 to move, and the screw rod 1231 rotates and moves up and down to complete the tightening action of the anchor ring 113 .

Specifically, referring to FIG. 15 , the bottom end of the screw rod 1231 is provided with a connecting shaft, and the connecting shaft is connected with the inner ring of the one-way bearing 1237. The outer ring connection.

A limit nut 1234 and a convex key roller 1235 are arranged on the screw mandrel 1231, the limit nut 1234 is threadedly connected with the screw mandrel 1231, and the limit nut 1234 is fixedly connected with the support, because the limit nut 1234 is fixedly connected with the support and is connected with the screw mandrel. 1231 threaded connection, when the screw rod 1231 rotates, the screw rod 1231 will move up and down while rotating; the outer peripheral surface of the screw rod 1231 is provided with a groove, and the groove extends parallel to the axial direction of the screw rod 1231, see Figure 16, convex The inner wall of the key roller 1235 is provided with a convex key, and the convex key is slidably connected with the groove. At the same time, because the convex key extends into the groove, when the convex key roller 1235 rotates, the side wall on one side of the convex key will be aligned with the groove. The side groove wall abuts against and drives the screw mandrel 1231 to rotate.

Specifically, the threaded cooperation between the screw rod 1231 and the limit nut 1234 is configured such that when the screw rod 1231 rotates around its own axis in the first direction, the screw rod 1231 will move downward at the same time, and when the screw rod 1231 rotates around its own axis in the second direction When rotating, screw mandrel 1231 can move upwards simultaneously; Since the bearing inner ring of one-way bearing 1237 can only rotate towards one direction relative to the bearing outer ring, it is set to be able to rotate along the first direction here. When rotating in one direction, the inner ring of the one-way bearing 1237 rotates relative to the outer ring, the screw 1231 rotates in the first direction and moves upward, the fixed rod 1232 does not rotate and moves upward with the screw 1231; when the screw 1231 moves in the second direction When rotating in the first direction, the inner ring of the one-way bearing 1237 cannot rotate relative to the outer ring, so the fixed rod 1232 will be driven by the screw rod 1231 to rotate in the second direction together, and the fixed rod 1232 and the screw rod 1231 will rotate in the second direction and move toward the second direction. Move down.

There is no limit to the number of grooves and protruding keys. In this embodiment, four grooves and four protruding keys are specifically set. The four grooves are evenly distributed along the axial direction of the screw rod 1231, and the four protruding keys are The convex key roller 1235 is evenly distributed axially on the inner side of the convex key roller 1235, and the four convex keys and the four grooves are slidingly matched, so that the torque is evenly distributed on the four convex keys, so as to avoid damage to a single convex key due to excessive torque.

The tightening assembly 123 also includes a first motor 1236, the first motor 1236 is connected to the convex key roller 1235 by a belt, the first motor 1236 can drive the convex key roller 1235 to rotate around the axis of the screw rod 1231, by changing the direction of rotation of the first motor 1236 The convex key roller 1235 can drive the screw rod 1231 to rotate in the first direction or the second direction. Since the screw rod 1231 and the limit nut 1234 are threaded, when the screw rod 1231 rotates around its own axis, it will move up or down at the same time .

Further, in order to prevent the first motor 1236 from driving the screw rod 1231 to rotate in the first direction and move upward beyond the allowable range, the first motor 1236 is provided with a rotary encoder, and the rotary encoder is provided with a preset rotation value, which is pre-calculated The rotation preset value required to move the screw 1231 and the fixed rod 1232 up the first set distance, when the screw 1231 moves up the first set distance, the rotary encoder just detects that the first motor 1236 reaches the preset rotation Value, at this time the motor stops rotating, avoiding the damage of the parts due to the movement of the screw mandrel 1231 beyond the range.

Further, the first motor 1236 is also provided with a first torque limiter, the first torque limiter is set with a first torque safety value, through pre-calculation or using an electronic torque wrench to measure the normal twisting of the anchor ring 113 close to the anchor The required torque value when backing the plate, and use this value as the first torque safety value of the torque limiter, when the tightening assembly 123 moves down under the action of the first motor 1236 until the anchor ring 113 tightly abuts against the anchor backing plate Unable to continue moving down, the torque acting on the first motor 1236 gradually increases, and when the torque is equal to the first torque safety value, the first torque limiter will stop the first motor 1236, and the tightening assembly 123 will stop moving down , to prevent the first motor 1236 and other components from being damaged due to untimely stop.

17, the 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 with the nut 1221, the second motor 1222 is connected with the nut sleeve 1223, the second The motor 1222 can drive the nut sleeve 1223 to rotate around the axis of the nut 1221. Since the nut 1221 is threadedly connected with the tension rod 112, when the nut sleeve 1223 rotates, it will drive the nut 1221 to move down to the first initial position together to complete the nut assembly. 122 moves.

Further, a second torque limiter is provided on the second motor 1222, and the second torque limiter is set with a second torque safety value, and the normal screwing of the nut 1221 to the jack is detected through pre-calculation or measurement with an electronic torque wrench. 121 end face, and take this value as the second torque safety value of the second torque limiter. When the nut 1221 is driven by the nut sleeve 1223, it rotates and moves downward until the nut 1221 is close to the leaked torque. Press the jack 121, at this time the nut 1221 cannot continue to rotate and descend, and the torque acting on the second motor 1222 becomes larger and larger until it reaches the second torque safety value, the second torque limiter starts to close the second motor 1222, Damage to the second motor 1222 and threads is avoided.

The general working process of the balance device for the asymmetrically stressed cantilever beam provided by the embodiment of the present invention is as follows:

Referring to Fig. 2, the pressure detection device 2 detects that the force between the cantilever beam and the leg 101 is recorded as an unbalanced force, and the pressure detection device 2 uploads the unbalanced force to the first control device, and the first control device according to the unbalanced force The force calculates the balance force and uploads the balance force to the second control device, and the second control device controls the tensioning device 1 to perform tension according to the magnitude of the balance force.

Referring to Fig. 3 and Fig. 4, after the tensioning device 1 receives the signal, the jack 121 is controlled to start, and the nut assembly 122 moves upward from the first initial position by the first set distance under the action of the jack 121, and the anchor ring 113 is held by the nut assembly 122 Drive together from the second initial position to move up the first set distance, and at the same time, the tension rod 112 is driven to move up the first set distance so that the tension beam 11 is stretched. At this time, the nut 1221 and the hydraulic rod of the jack 121 The end faces are abutted, and the nut 1221 fixes the tension rod 112 at the position after being stretched, so that the tension beam 11 remains in the stretched state at this time. In order to perform the next tension, it is necessary to repeat the jack 121 to jack up the nut 1221 In the process, the anchor ring 113 needs to be lowered to the second initial position, so that the anchor ring 113 abuts against the anchor backing plate again to fix the tension beam 11, so that the nut assembly 122 and the jack 121 can be reset.

Specifically, referring to Fig. 9, since the first gear is limited by the gear limit 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 moves upward from The outside enters into the accommodating cavity of the fixing rod 1232 .

5 and 9, the tightening mechanism needs to lower the anchor ring 113 to the second initial position, the first motor 1236 starts, and the first motor 1236 drives the convex key roller 1235 to rotate around the second direction through the pulley and the belt. The convex key of the roller 1235 is connected with the groove of the screw mandrel 1231, so the convex key roller 1235 will drive the screw mandrel 1231 to rotate around the second direction, because the inner ring of the one-way bearing 1237 connecting the screw mandrel 1231 and the fixed rod 1232 is relatively to the outer ring of the one-way bearing 1237 The circle can only rotate in the first direction, therefore, the screw rod 1231 will drive the fixed rod 1232 and the sliding rod 1233 to rotate around the second direction synchronously and move downward.

When 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, so the anchor ring 113 rotates synchronously under the drive of the sliding rod 1233, and the anchor ring 113 and the tension rod 112 are Threaded connection, so the anchor ring 113 will move downward along the axial direction of the tension rod 112 when it rotates downward. When the anchor ring 113 descends the first set distance, the anchor ring 113 abuts against the anchor pad The ring 113 is continuously tightened by the tightening mechanism, and 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 set on the first motor 1236 The start of the limiter makes the first motor 1236 stop working, and the slide bar 1233 and the anchor ring 113 no longer descend.

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

Referring to Fig. 6, at this time, the anchor ring 113 is in tight contact with the anchor backing plate, which limits the retraction of the tensile beam 11, and fixes the tensile beam 11. At this time, the jack 121 can release the pressure, and the piston rod of the jack 121 moves downward. To move, the nut assembly 122 is separated from the jack 121. In order to perform the next tension, the nut assembly 122 needs to be lowered to the first initial position to abut against the jack 121 again.

Referring to Fig. 7, the second motor 1222 of the nut assembly 122 is started, so that the nut sleeve 1223 drives the nut 1221 to rotate axially around the tension rod 112 and move downward at the same time. When the nut assembly 122 descends the first set distance, the nut 1221 clings 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 provided on the second motor 1222 starts to stop the second motor 1237, and the anchor ring 113 no longer descends.

Now, the nut 1221 returns to the first initial position, and the anchor ring 113 returns to the second initial position. Since the linkage rod and the anchor ring 113 move downward together under the action of the first motor 1236, the tightening assembly 123 The sliding rod 1233 is still all in the accommodating cavity of the fixed rod 1232, and because the anchor ring 113 and the sliding rod 1233 are moved upwards by the jack 121 during the stretching against the tension beam 11, and the position of the fixed rod 1232 is not moving, the sliding rod 1233 needs to enter into the accommodation chamber of the fixed rod 1232 upwards, so the screw rod 1231 and the fixed rod 1232 in the tightening assembly 123 need to be moved up by a first set distance to the position before tensioning, The sliding rod 1233 is fully stretched out from the accommodating cavity of the fixed rod 1232 to provide space for the movement of the sliding rod 1233 during the next tension.

Referring to Fig. 8, the first motor 1236 of the tightening assembly 123 is started, and the first motor 1236 makes the convex key roller 1235 rotate around the first direction through the first pulley and the first belt, and the screw mandrel 1231 is driven by the convex key roller 1235 at the same time Rotate around the first direction and move upward, because the inner ring of the one-way bearing 1237 can move around the first direction relative to the outer ring, therefore, the fixed rod 1232 connected with the outer ring of the one-way bearing 1237 will not move along with the screw rod 1231 Move around the first direction, but the fixed rod 1232 will move upward together with the screw rod 1231. When the screw rod 1231 moves up the first set distance, the rotary encoder just detects that the first motor 1236 reaches the rotation preset value, and the motor stops Rotate, at this time the sliding rod 1233 just fully stretches out from the accommodating cavity of the fixing rod 1232 .

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 anti-tension beam 11. If the cable force is less than the balance force, then the anti-tension beam 11 cannot Provide enough cable force to balance the cantilever beam, the second control device will make the tension mechanism 12 perform the next tension until the cable force detected by the cable force dynamic measuring instrument 13 is greater than or equal to the balance force, and the tension mechanism 12 will Stop tensioning. When the unbalanced force changes, the first control device will recalculate the balance force required to balance the cantilever beam, and then repeat the above-mentioned tensioning process until the cable force dynamic tester 13 detects that the cable force on the tension beam 11 is greater than equal to the new equilibrium force.

The embodiment of the present invention also provides a method for balancing an asymmetrically stressed cantilever beam, which is completed by using a balancing device for an asymmetrically stressed cantilever beam, including:

Step 1: The pressure value of the cantilever beam at the outrigger 101 is detected in real time by the pressure detection device 2, which is recorded as an unbalanced force, and the pressure detection device 2 transmits the unbalanced force to the control device;

Step 2: The control device calculates the balance force required to keep the cantilever beam balanced according to the unbalanced force, and controls the tensioning device 1 to apply a balance force to the cantilever beam.

Since the tensioning device 1 is difficult to make the cable force on the tensioning beam 11 reach a balance force when the tensioning device 1 stretches the anti-tensioning beam 11 once, it is necessary for the tensioning device 1 to perform multiple tensions on the anti-tensioning beam 11 until the upper tensioning beam 11 If the cable force is greater than or equal to the balance force, the tensioning will stop. When the unbalanced force changes, the control device will control the tensioning mechanism 12 to perform multiple tensions in real time according to the constantly changing unbalanced force, avoiding the use of complicated shafts. Force servo system reduces engineering difficulty and increases work efficiency.

In step 1, by installing a pressure detection device 2 between the cantilever beam and the outrigger 101, the pressure of the cantilever beam at the outrigger 101 can be detected in real time, and 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 balance force capable of balancing the cantilever beam and uploads it to the second control device.

Step 2 includes:

Step 21: The nut assembly 122 is located at a first initial position, and the anchor ring 113 is located at a second initial position.

Referring to Fig. 2, the pressure detection device 2 detects that the force between the cantilever beam and the leg 101 is recorded as an unbalanced force, and the pressure detection device 2 uploads the unbalanced force to the first control device, and the first control device according to the unbalanced force The force calculates the balance force and uploads the balance force to the second control device, and the second control device controls the tensioning device 1 to perform tension according to the magnitude of the balance force.

Step 22: The jack 121 is loaded to drive the nut assembly 122, the tension rod 112 and the anchor ring 113 to move up the first set distance synchronously, and apply tension to the steel wire 111, and the tension on the tension beam 11 acts on the cantilever beam through the support.

Referring to Fig. 3 and Fig. 4, after the tensioning device 1 receives the signal, the jack 121 is controlled to start, and the nut assembly 122 moves upward from the first initial position by the first set distance under the action of the jack 121, and the anchor ring 113 is held by the nut assembly 122 Drive together from the second initial position to move up the first set distance, and at the same time, the tension rod 112 is driven to move up the first set distance so that the tension beam 11 is stretched. At this time, the nut 1221 and the hydraulic rod of the jack 121 The end faces abut against each other, and the nut 1221 fixes the tension rod 112 at the stretched position, so that the tensile bundle 11 remains in the tensioned state at this time.

Specifically, 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 fixed position from the outside. In the cavity of the rod 1232.

In order to carry out the next tensioning, it is necessary to repeat the process of jacking up the nut 1221 by the jack 121, then the anchor ring 113 needs to be lowered to the second initial position, so that the anchor ring 113 abuts against the anchor backing plate again to fix the tensile beam 11 , so that the nut assembly 122 and the jack 121 can be reset.

Step 23: The anchor ring 113 moves down the first set distance and returns to the second initial position.

5 and 9, the tightening mechanism needs to lower the anchor ring 113 to the second initial position, the first motor 1236 starts, and the first motor 1236 drives the convex key roller 1235 to rotate around the second direction through the pulley and the belt. The convex key of the key roller 1235 is connected with the groove of the screw rod 1231, so the convex key roller 1235 can drive the linkage rod to rotate around the second direction, because the inner ring of the one-way bearing 1237 connecting the screw rod 1231 and the fixed rod 1232 is relatively The outer ring cannot rotate in the second direction, so the inner ring will drive the outer ring to rotate together, and the screw rod 1231 will drive the fixed rod 1232 and the sliding rod 1233 to rotate around the second direction synchronously and move downward.

When 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, so the anchor ring 113 rotates synchronously under the drive of the sliding rod 1233, and the anchor ring 113 and the tension rod 112 are Threaded connection, so the anchor ring 113 will move downward along the axial direction of the tension rod 112 when it rotates downward. When the anchor ring 113 descends the first set distance, the anchor ring 113 abuts against the anchor pad The ring 113 is continuously tightened by the tightening mechanism, and 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 set on the second motor 1237 The start of the limiter makes the second motor 1237 stop working, and the anchor ring 113 no longer descends.

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

Step 24: The jack 121 is depressurized, and the nut assembly 122 moves down a first set distance to return to the first initial position;

See Figure 6 until the anchor ring 113 is in tight contact with the anchor backing plate, limiting the retraction of the tensile beam 11 and fixing the tensile beam 11. At this time, the pressure of the jack 121 is released, and the piston rod of the jack 121 moves down to make the nut The assembly 122 is separated from the jack 121 , and the nut assembly 122 needs to be lowered to the first initial position to abut against the jack 121 again for the next tensioning.

Referring to Fig. 7, the second motor 1222 of the nut assembly 122 is started, so that the nut sleeve 1223 drives the nut 1221 to rotate axially around the tension rod and move downward at the same time. When the nut assembly 122 descends the first set distance, the nut 1221 clings to the jack 121 The end face of the piston rod, 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 provided on the second motor 1222 starts to stop the second motor 1237, and the anchor ring 113 no longer descends.

At this time, the nut 1221 returns to the first initial position, and the anchor ring 113 returns to the second initial position. Since the linkage rod and the anchor ring 113 move downward together under the action of the first motor 1237, the tightening assembly 123 The sliding rod 1233 is all in the accommodating cavity of the fixed rod 1232, and because the anchor ring 113 and the sliding rod 1233 are driven upward by the jack 121 during the stretching against the tension beam 11, and the position of the fixed rod 1232 is If it does not move, the sliding rod 1233 needs to enter into the accommodation cavity of the fixed rod 1232 upwards, so the screw rod 1231 and the fixed rod 1232 in the tightening assembly 123 need to be moved up by a first set distance to the position before tensioning, so that The sliding rod 1233 is completely out of the accommodating cavity of the fixed rod 1232 to provide space for the movement of the sliding rod 1233 for the next tensioning.

Referring to Fig. 8 and Fig. 9, the first motor of the tightening assembly is started, the first motor 1236 rotates the convex key roller 1235 in the first direction through the pulley and the belt, and the screw 1231 is driven by the convex key roller 1235 to rotate in the first direction at the same time. Rotate and move upward, because the inner ring of the one-way bearing 1237 can move around the first direction relative to the outer ring, therefore, the fixed rod 1232 connected with the outer ring will not move around the first direction together with the screw rod 1231, but fixed The rod 1232 will move upward together with the screw rod 1231. When the screw rod 1231 moves up the first set distance, the rotary encoder just detects that the first motor 1236 reaches the preset rotation value, and the motor stops rotating. At this time, the sliding rod 1233 just Completely protrude from the accommodating cavity of the fixing rod 1232 .

Step 25: Repeat steps 22 to 24 until the tensile force exerted by the tension beam 11 detected by the cable force dynamic tester 13 is greater than or equal to the balance force; return to step 1.

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 anti-tension beam 11. If the cable force is less than the balance force, then the anti-tension beam 11 cannot Provide enough cable force to balance the cantilever beam, the second control device will make the tension mechanism 12 perform the next tension until the cable force detected by the cable force dynamic measuring instrument 13 is greater than or equal to the balance force, and the tension mechanism 12 stops La Zhang.

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

A method for balancing an asymmetrically stressed cantilever beam provided in an embodiment of the present invention is completed by using the balance calculation formula of an asymmetrically stressed cantilever beam. Refer to Figure 2, Figure 18 and Figure 19 for details, including:

Set the initial cable force exerted by the tensile beam 11 on both sides on the cantilever beam as T0, set the force exerted by the tensile beam 11 on the left side on the cantilever beam as T1, and set the force exerted by the tensile beam 11 on the right side on the cantilever beam as T1 The force is set as T2, the distance between the left and right tensile beams 11 and the center of the starting block 300 is L0, the force exerted by the left side leg 101 on the cantilever beam is set as F1, and the distance between the left side leg 101 and the starting block 300 is 300 The distance from the center is L1, the force exerted by the right outrigger 101 on the cantilever beam is set as F2, the distance between the right outrigger 101 and the center of the starting block 300 is L2, and the counterclockwise moment of the cantilever beam is set as M1, the cantilever The clockwise moment of the beam is set to M2.

When only one outrigger 101 on both sides of the cantilever beam acts on the cantilever beam, take the case where only the left outrigger 101 acts on the cantilever beam and the right outrigger 101 acts on another pier structure 200 as an example, see Figure 18 , because F1 acts on the cantilever beam, the T-shaped structure formed by the pier structure 200 and the starting block 300 may overturn counterclockwise, so the right tensile beam 11 needs to be stretched to balance the pair of left outrigger 101 The force T2 exerted by the cantilever beam is such that M1 = M2.

According to the principle of moment balance, the following calculation formula can be established:

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

In the formula, the value of F1 is obtained by the detection of the pressure detection device 2, and the value of T1 is obtained by the detection of the cable force dynamic tester 13.

At this time, a single steel wire 111 needs to be tensioned with a cable force Tn=(T2-T0)÷N, where N is the number of steel wires 111 in the tensile bundle 11 .

Because there are still some unforeseen situations in the construction, such as the weight deviation of the beam section, the position deviation of the outrigger 101, and the uncertain distribution of construction resources (such as equipment, materials, personnel), etc., it is still necessary to design the tensile force of the tensile beam 11. A certain safety factor needs to be considered, and here the safety factor is set to K1, that is, the cable force of the single steel wire 111 on the right side when the cantilever beam can be kept in balance is K1*Tn.

When both sides of the cantilever beam have outriggers 101 acting on the cantilever beam, see Figure 19, according to "the left tensile beam 11 is responsible for resisting the clockwise overturning moment of the T-shaped structure, and the right tensile beam 11 is responsible for resisting the T-shaped overturning moment." According to the principle of anti-clockwise overturning moment of the structure, the following calculation formula is established:

M1＝F1×L1＝T2×L0→T2＝F1×L1÷L0

M2＝F2×L2＝T1×L0→T1＝F2×L2÷L0

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

At this time, the cable force required by the single steel wire 111 of the left tensile bundle 11 is T1n=(T2-T0)÷N, and the required tension force of the single steel wire 111 of the right tensile bundle 11 It is T2n=(T1-T0)÷N.

Since there are still some unpredictable situations in the construction, such as the weight deviation of the beam section, the position deviation of the outrigger 101, and the uncertain distribution of construction resources (such as equipment, materials, personnel), etc., it is still necessary to design the tensile force of the tensile beam 11. A certain safety factor needs to be considered. Here, the safety factor is set to K2, that is, the cable force of the single steel wire 111 of the left tension beam 11 is K2*T1n when the cantilever beam can be kept in balance, and the right single wire 111 can be kept in balance. The cable force of a steel wire 111 is K2*T2n.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. Various obvious changes, readjustments, and substitutions will occur to those skilled in the art without departing from the scope of the present invention. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. The utility model provides a balancing unit of asymmetric atress cantilever beam, characterized in that, includes pressure measurement (2), tensioning equipment (1) and controlling means, pressure measurement (2) set up between landing leg (101) and the cantilever beam of lifting device (100), controlling means can receive the transmission signal of pressure measurement (2), tensioning equipment (1) includes:

the tensile bundle (11) comprises a steel wire (111) and a tension rod (112), the bottom end of the steel wire (111) is fixedly connected with a foundation, the tension rod (112) is fixedly connected with the top end of the steel wire (111), the top end of the tension rod (112) penetrates through the cantilever beam and is in threaded connection with an anchor ring (113), and the tensile force of the tensile bundle (11) can be transmitted to the cantilever beam through the anchor ring (113);

a tensioning mechanism (12) connected with the tensioning rod (112), wherein the tensioning mechanism (12) comprises a support, and a jack (121), a nut component (122) and a tightening component (123) connected with the support, the support is fixedly connected with the cantilever beam, a nut (1221) of the nut component (122) is in threaded connection with the upper part of the tensioning rod (112), the jack (121) is arranged between the support and the nut component (122) and the jack (121) can lift up the nut (1221) to apply a pulling force to the tension resisting bundle (11), the pulling force of the tension resisting bundle (11) can be transmitted to the cantilever beam through the support, and the tightening component (123) can drive the anchor ring (113) to move downwards along the tensioning rod (112) to tighten the anchor ring (113);

and the cable force dynamic measuring instrument (13) is connected with the tensile beam (11) and is used for detecting the tensile force applied by the tensile beam (11).

2. The balance of asymmetric stressed cantilever according to claim 1, wherein the tightening assembly (123) comprises a linkage, the linkage 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), and the anchor ring (113) is moved upward to push the sliding rod (1233) to retract relative to the fixed rod (1232).

3. The balance device for the asymmetrically stressed cantilever beam according to claim 2, wherein the bottom end of the sliding rod (1233) is provided with a first gear, the 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 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 balance device of the asymmetrically stressed cantilever beam of claim 2, wherein the linkage further comprises a lead screw (1231) connected to the fixing rod (1232), the lead screw (1231) is inserted into the fixing rod (1232) and connected to the fixing rod (1232) through a one-way bearing (1237), and the lead screw (1231) can rotate around its axis and can move up and down to drive the fixing rod (1232) to move.

5. The balance device of the asymmetric stressed cantilever beam of claim 4, wherein the screw mandrel (1231) is provided with a limit nut (1234) and a convex key roller (1235), the limit nut (1234) is in threaded connection with the screw mandrel (1231), the limit nut (1234) is fixedly connected with the support, the outer circumferential surface of the screw mandrel (1231) is provided with a groove, the groove extends in parallel with the axial direction of the screw mandrel (1231), and the inner wall of the convex key roller (1235) is provided with a convex key, and the convex key is in sliding connection with the groove.

6. The balance of asymmetrically stressed cantilever according to claim 5, wherein the tightening assembly (123) further comprises a first motor (1236), the first motor (1236) is connected with the key roller (1235) through a belt, the first motor (1236) can drive the key roller (1235) to rotate around the axis of the screw rod (1231).

7. The balance device of the asymmetrically stressed cantilever beam of claim 2, wherein the fixing rod (1232) is provided with a plurality of sliding grooves, and the sliding rod (1233) is provided with a plurality of locking posts, and the locking posts are slidably engaged with the sliding grooves.

8. The balance of asymmetric stressed cantilever according to any one of claims 1 to 7, wherein the tightening assemblies (123) are provided in at least two, at least two of the tightening assemblies (123) being evenly spaced around the periphery of the anchorage member (113).

9. The balance of asymmetric stressed cantilever 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 circumference 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 asymmetrically stressed cantilever beams, wherein the apparatus employing the apparatus of any one of claims 1-9, comprises:

step 1: the pressure value of the cantilever beam at the supporting leg (101) is detected in real time through the pressure detection device (2) and recorded as unbalanced force, and the unbalanced force is transmitted to the control device through the pressure detection device (2);

and 2, step: the control device calculates the balance force required for keeping the balance of the cantilever beam according to the unbalance force and controls the tensioning device (1) to apply the balance force to the cantilever beam;

in the step 2, the tensioning device (1) applies a balance force to the cantilever beam, and comprises:

step 21: the nut assembly (122) is located at a first initial position, the nut (1221) is in contact with the telescopic rod of the jack (121), the anchor ring (113) is located at a second initial position, and the anchor ring (113) abuts against the cantilever beam;

step 22: the jack (121) is loaded to lift the nut (1221) upwards, the nut component (122), the tension rod (112) and the anchor ring (113) are driven to move upwards for a first set distance synchronously, tension is applied to the steel wire (111), and the tension on the tension beam (11) acts on the cantilever beam through the support;

step 23: the tightening assembly (123) drives the anchor ring (113) to move downwards for a first set distance, so that the anchor ring (113) returns to a second initial position;

step 24: the jack (121) releases pressure, and the nut component (122) moves downwards for a first set distance to return to a first initial position;

step 25: repeating the steps 22 to 24 until the tensile force applied by the tensile beam (11) detected by the cable dynamometer (13) is greater than or equal to the balance force; and returning to the step 1.

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