Counterweight sand box for adjusting gravity center of bridge

Abstract

The embodiment of the invention provides a counterweight sand box for adjusting the center of gravity of a bridge, which comprises a counterweight sand box shell composed of a protective steel plate assembly; the bottom foundation balancing weight assembly is arranged at the bottom of the balancing weight sand box shell; the array type independent sand box assembly is arranged in the counterweight sand box shell and comprises a plurality of independent sand boxes, each independent sand box is filled with soluble mortar, and adjusting holes are formed in the periphery of each independent sand box; the temperature control heating assemblies are in one-to-one correspondence with the adjusting holes, are arranged at orifices of the adjusting holes and are configured to automatically heat the soluble mortar according to the temperature to enable the soluble mortar to flow; the control assembly is connected with the temperature control heating assembly and is configured to control the temperature control heating assembly to execute heating operation so as to achieve balance weight adjustment. The multi-dimensional precise counterweight sand box is adaptive to asymmetric swivel bridge construction and based on soluble mortar, the gravity center posture can be rapidly and precisely adjusted in the swivel process, and swivel construction safety and precision are guaranteed.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bridge engineering construction, and particularly relates to a counterweight sand box for bridge gravity center adjustment. BACKGROUND

[0002] The asymmetric swivel bridge is a core bridge type for crossing existing lines, and its construction principle is to pour and form the main beam of the bridge on the shore support, rotate the main beam to the design axis through the swivel hinge and traction system, and complete the closure. The core technical difficulty of the swivel process is dynamic balance control of the gravity center: due to the asymmetric span and weight of the main beam on both sides, unbalanced bending moment is easily generated when the main beam is rotated, which leads to the inclination of the main beam and the stress of the swivel hinge exceeding the limit, and even causes the swivel instability accident.

[0003] The counterweight device is the "posture adjustment core component" of the asymmetric swivel bridge, and its performance directly determines the success or failure of the swivel: if the adjustment response is slow, the best adjustment opportunity is easily missed, leading to the aggravation of the inclination; if the adjustment precision is low, the strict requirements of the closure on the posture cannot be met; if the environmental adaptability is poor, frequent failures will occur in the field construction. The counterweight device currently applied in the industry still has significant technical bottlenecks.

[0004] Traditional fixed counterweight: the adjustment flexibility is zero, the counterweight needs to be moved when the gravity center is found to be deviated during the swivel, the time consumption of single adjustment is more than 4 hours, the efficiency is extremely low, and micro-adjustment cannot be realized;

[0005] Mechanical movable counterweight: relies on a complex transmission mechanism, the swivel construction site is narrow, the mechanism is difficult to arrange, and vibration easily leads to transmission jam, the adjustment response delay is more than 15s;

[0006] Hydraulic drive counterweight: high maintenance cost, dust and rainwater easily cause hydraulic valve blockage, and there is no manual backup, so the swivel is directly interrupted when a fault occurs. SUMMARY

[0007] The counterweight sand box for bridge gravity center adjustment provided by the embodiments of the present application can realize rapid and accurate adjustment of the gravity center posture during the swivel process, and guarantee the safety and precision of the swivel construction.

[0008] In a first aspect, the embodiments of the present application provide a counterweight sand box for bridge gravity center adjustment, which comprises:

[0009] The counterweight sand box shell, the bottom base counterweight block assembly, the array type independent sand box assembly, the temperature control heating assembly and the control assembly;

[0010] The counterweight sand box shell is composed of a protective steel plate assembly;

[0011] The bottom base counterweight block assembly is arranged at the bottom of the counterweight sand box shell;

[0012] The arrayed independent sand box assembly is arranged inside the counterweight sand box shell, and includes a plurality of independent sand boxes, each of which is filled with soluble mortar and has adjusting holes opened around each independent sand box.

[0013] The temperature-controlled heating assembly is arranged at the adjusting hole and is configured to automatically heat the soluble mortar to make it flow according to the temperature.

[0014] The control assembly is connected with the temperature-controlled heating assembly and is configured to control the temperature-controlled heating assembly to perform a heating operation to realize counterweight adjustment.

[0015] In an optional embodiment, the protective steel plate assembly is made of low-alloy steel plate, the outer surface is provided with an anti-corrosion coating, and the inner surface is provided with a waterproof film.

[0016] In an optional embodiment, the bottom foundation counterweight block assembly adopts a modular design and includes gray cast iron blocks or concrete precast blocks, and the concrete precast blocks are internally provided with a steel mesh reinforcement structure.

[0017] In an optional embodiment, the arrayed independent sand box assembly is divided into a plurality of independent regions along the height direction, including a low region, a middle region and a high region, each region corresponds to a different counterweight adjustment level, and adjusting holes are opened around each region.

[0018] In an optional embodiment, a heat insulation layer is arranged between the independent regions, and the heat insulation layer includes high-density aluminum silicate cotton and aluminum foil reflective film.

[0019] In an optional embodiment, the soluble mortar flows in a heated state and is fixed and sealed in a cooled state.

[0020] In an optional embodiment, a stainless steel sleeve is arranged in the adjusting hole.

[0021] In an optional embodiment, the temperature-controlled heating assembly includes a silica gel heating ring and a temperature sensor, and the silica gel heating ring is tightly attached to the stainless steel sleeve of the adjusting hole.

[0022] In an optional embodiment, the arrayed independent sand box assembly is made of glass fiber modified polypropylene material, and the inner wall is provided with a polytetrafluoroethylene coating.

[0023] In an optional embodiment, the control assembly includes a PLC master control unit, a manual control module and an alarm unit, and the PLC master control unit is internally provided with a gravity center adjustment algorithm.

[0024] The technical scheme provided by the embodiments has the following beneficial effects:

[0025] The application realizes fine partition management of the counterweight resource in the vertical direction by dividing the sand box into multiple adjustment areas with independent heat insulation layers along the height, so that the device can accurately select areas of different magnitudes for adjustment according to the real-time attitude offset of the bridge, fundamentally avoids the problems of excessive or insufficient adjustment, and achieves the technical effect of "precise delivery on demand"; the soluble mortar sealing adjustment assembly and the temperature control heating assembly work together, using the thermoplasticity and phase change characteristics of the specific material, that is, the flowability of the soluble mortar increases when heated, and the physical properties recover after cooling, the local precise heating and ablation of the sealing mortar by the temperature control assembly is realized, the controlled release of the counterweight material according to the instruction is realized, so that the counterweight adjustment process does not need complex mechanical transmission or hydraulic power, the structure is significantly simplified, thereby obtaining the technical effects of rapid response and stepless micro-adjustment, and eliminating the risk of traditional mechanism jamming or hydraulic leakage; in addition, the control assembly integrates automatic adjustment, manual emergency backup and real-time fault warning function, enhances the environmental adaptability and system fault tolerance of the device, and ensures the continuity and safety of the construction process under various emergencies. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a top view structural schematic diagram of a counterweight sand box for bridge gravity adjustment provided by the embodiment of the application;

[0027] Figure 2 is a front view sectional structural schematic diagram of a counterweight sand box for bridge gravity adjustment provided by the embodiment of the application;

[0028] Figure 3 is a local enlarged structural schematic diagram of an adjustment hole provided by the embodiment of the application.

[0029] In the drawings:

[0030] 1 - protective steel plate assembly; 2 - bottom foundation counterweight block assembly; 3 - array type independent sand box assembly; 4 - temperature control heating assembly; 5 - control assembly; 6 - adjustment hole; 7 - heat insulation layer. DETAILED DESCRIPTION

[0031] The application will be further described in detail by the drawings and specific embodiments.

[0032] As described in the background, the counterweight devices currently applied in the construction of asymmetric rotating bridges are mainly divided into three types, and the three types of devices cannot meet the construction needs of modern large-span asymmetric rotating bridges in terms of adjustment efficiency, accuracy, environmental adaptability and safety, and the specific defects are as follows:

[0033] Fixed counterweight device:

[0034] (1) Adjustment is completely dependent on manual work, and the swivel process cannot dynamically respond. For example, in the construction of a certain asymmetric swivel bridge across a railway, it was found that the main beam tilted 2.5° on the north side, so the swivel had to be stopped, a team of 10 people had to carry a 5t steel ingot to the south side, and the single adjustment took 5 hours, causing the temporary closure of the existing railway to exceed the limit;

[0035] (2) The precision is very poor, with a deviation of 8%-15%. Since the weight block specifications are fixed, it is not possible to achieve a small amount of compensation, and the manual placement position deviation is large. In a certain project, the main beam was misaligned by 15mm due to the weight deviation during closure, and additional anchoring reinforcement was required;

[0036] (3) Poor versatility, large site occupation. Different swivel weights require different specifications of weight blocks, and a certain 1000t swivel project requires storage of more than 50 types of weight blocks, occupying a construction site of 200㎡, and the transportation cost is high.

[0037] Mechanical movable weight device:

[0038] (1) Adjustment dimension is limited, and vertical layered control cannot be achieved. The existing device can only adjust the center of gravity by moving the sand box as a whole horizontally, and cannot adjust the sand box "bottom / top" weight difference. For example, when the end of the main beam of the swivel bridge is bent, additional top weight is required to offset the bending moment, but the mechanical device cannot achieve this;

[0039] (2) Poor environmental adaptability, frequent failures. In the construction of a certain asymmetric swivel bridge in a mountainous area, dust entered the gap between the guide rails, causing the electric hoist to jam, the adjustment response was delayed by 20s, the main beam tilt expanded to 3.2°, and an accident almost occurred;

[0040] (3) Load is limited, not suitable for large weight swivel. The carrying capacity of the guide rail and the driving mechanism is usually ≤500t, and for large weight swivel bridges above 5000t, multiple devices need to be arranged, causing mutual interference and poor adjustment synchronization.

[0041] Hydraulic driven weight device:

[0042] (1) High maintenance cost, strict sealing requirement. The hydraulic system needs to check the hydraulic oil level and cleanliness every 3 days and replace the filter every 15 days, with a single maintenance cost of more than 8000 yuan; In a certain project, rainwater seeped into the hydraulic oil tank, causing the entire system to rust, and the repair took 3 days, delaying the swivel construction period;

[0043] (2) Adjustment accuracy is greatly affected by oil temperature. Changes in the construction environment temperature can cause the viscosity of the hydraulic oil to change by more than 30%, which in turn causes the adjustment accuracy deviation to expand from 3% to 6%, which cannot meet the closure requirements;

[0044] (3) No emergency backup mechanism. Once the hydraulic pump fails or the pipeline leaks, the counterweight device is completely disabled, the bridge is in a "no adjustment" state, and temporary cable wind ropes need to be used for traction, which is extremely risky.

[0045] In addition, the "soluble mortar" has not been applied to the asymmetrically rotating bridge construction counterweight in the prior art, and there are three major technical obstacles: regional heat insulation problem: if the sand box is not divided into regions or has no heat insulation design, heating a hole will cause the adjacent region mortar to melt in advance, causing misadjustment; construction environment protection problem: the rotating construction is mostly carried out in the field, and dust and rainwater are easy to enter the device, causing the adjustment hole to be blocked or the heating element to be short-circuited; material recycling problem: the existing design does not consider the recycling of the outflowing mortar, and if it is directly discarded, not only the cost (the cost of each ton of mortar is more than 800 yuan) is increased, but also construction garbage is generated. Therefore, the present application aims to solve these technical bottlenecks and develop a multi-dimensional precise counterweight sand box based on soluble mortar for asymmetrically rotating bridge construction, which is a key to breaking through the technical bottleneck in the industry.

[0046] The embodiment of the present application provides a counterweight sand box for bridge gravity adjustment, Figure 1 is a top view structural schematic diagram of the counterweight sand box for bridge gravity adjustment provided by the embodiment of the present application, Figure 2 is a front view cross-sectional structural schematic diagram of the counterweight sand box for bridge gravity adjustment provided by the embodiment of the present application, as Figure 1 and Figure 2 shown, the device comprises:

[0047] The counterweight sand box shell, the bottom base counterweight block assembly 2, the array type independent sand box assembly 3, the temperature control heating assembly 4 and the control assembly 5;

[0048] The counterweight sand box shell is composed of a protective steel plate assembly 1;

[0049] The bottom base counterweight block assembly 2 is arranged at the bottom of the counterweight sand box shell;

[0050] The array type independent sand box assembly 3 is arranged inside the counterweight sand box shell and comprises a plurality of independent sand boxes, each independent sand box is filled with soluble mortar, and an adjustment hole 6 is formed around each independent sand box;

[0051] The temperature control heating assembly 4 corresponds to the adjustment hole 6 one by one and is arranged at the hole of the adjustment hole 6, and is configured to automatically heat the soluble mortar to make it flow according to the temperature;

[0052] The control assembly 5 is connected with the temperature control heating assembly 4 and is configured to control the temperature control heating assembly 4 to perform the heating operation to realize the counterweight adjustment.

[0053] In some embodiments, the protective steel plate assembly 1 serves as the outer layer of the device and carries the protective core. It is made of low-alloy steel plate, with a corrosion-resistant coating on the outer surface and a waterproof film on the inner surface. Specifically, the protective steel plate assembly 1 is integrally bent and formed from Q355B low-alloy steel plate, with a thickness of 16 mm dynamically adapted to the weight of the rotating body to ensure no plastic deformation under a load of 8000t rotating body. The outer surface is coated with a double-layer corrosion-resistant coating ("epoxy zinc + polyurea") with a total thickness of ≥140μm, and can withstand neutral salt spray testing for >1000 hours, suitable for outdoor use for 2-3 years during bridge construction. The inner surface is pasted with a butyl rubber waterproof film to prevent gas corrosion of the steel plate caused by mortar heating and volatilization. The bottom composite cushion is composed of 10mm thick natural rubber and 5mm thick steel plate, which not only enhances the friction with the main beam but also absorbs the vibration of the rotating body to avoid damage to the main beam concrete. The side maintenance door facilitates mortar replenishment and internal maintenance, and the silicone seal ring ensures waterproof and dustproof. The design of the protective steel plate assembly 1 makes the entire counterweight sand tank have excellent environmental adaptability, and can effectively resist the effects of wind and rain erosion, ultraviolet aging, and temperature changes. The protective coating system on the outer surface of the steel plate provides long-term reliable corrosion protection for the device, and the waterproof film on the inner surface ensures the normal operation of the internal mechanism. The entire protective system only needs minimal maintenance during the design life, greatly reducing the cost of use.

[0054] In some embodiments, the bottom foundation counterweight block assembly 2 serves as the core component for lifting the weight and stability of the device, and adopts a modular design that balances weight controllability and structural strength. The material selection logic includes: gray cast iron counterweight units have higher density characteristics and can provide more counterweight mass under the same volume conditions, suitable for "small volume high weight" scenarios. The density of gray cast iron is 7.2g / cm³, and the weight of a single 800×600×200mm cast iron block is about 691.2kg, which is 2.4 times heavier than a C60 concrete block of the same size (weight about 288kg). C60 concrete precast blocks are more economical and simple in process, with widely available concrete raw materials and relatively low cost, suitable for "large weight low cost" scenarios (such as large-span rotating bridges, which require large weight counterweights and have limited budgets). The built-in steel mesh improves crack resistance and prevents damage during transportation and installation. The modular design of the bottom foundation counterweight block assembly 2 has good maintainability and replaceability. If individual counterweight units are damaged during long-term use, they can be replaced individually without affecting the overall structure. At the same time, the modular design also brings convenience to transportation and storage, as standard-sized counterweight units can be efficiently stacked to save space.

[0055] In some embodiments, the arrayed independent sand box assembly 3 is made of glass fiber modified polypropylene material, which takes into account lightweight and high strength. Compared with traditional steel sand box, the weight is reduced by 40%, reducing the additional load of the main beam. After glass fiber modification, the bending strength is increased to 35MPa, which can withstand the lateral pressure of internal mortar without deformation. The volume of a single sand box is 0.8-1.2m³, and the total volume of the array can reach 40.96m³, which can provide about 36t counterweight to meet the demand of small and medium weight rotating bridge; if larger counterweight is needed, multiple arrays can be connected in parallel. The inner wall of the sand box is coated with polytetrafluoroethylene, which greatly reduces the residual rate of mortar and avoids the reduction of volume after repeated use.

[0056] Further, each independent sand box is divided into low, medium and high three independent areas along the height, corresponding to different counterweight adjustment levels. The low area (20%-30% volume) is used for trace adjustment, the medium area (40%-60%) is used for medium adjustment, and the high area (70%-90%) is used for large adjustment, realizing "selecting area as needed" and avoiding excessive adjustment. This height zoning design makes the counterweight adjustment more targeted and adaptive. Different levels of adjustment requirements can be realized by selecting the corresponding area, avoiding waste of resources and preventing repeated adjustment caused by excessive adjustment.

[0057] Further, the polypropylene partition plate between the low, medium and high three independent areas is provided with a heat insulation layer 7 to prevent temperature changes from causing the partition plate to crack. The heat insulation layer 7 includes high-density aluminum silicate cotton and aluminum foil reflective film. The high-density aluminum silicate cotton can effectively block the heat transfer between adjacent areas. When the high area is heated, the temperature rise of the medium area is ≤5℃, ensuring that only the target area mortar melts. The aluminum foil reflective film can reflect more than 80% of the radiant heat, further improving the heat insulation effect.

[0058] When a certain area needs to be adjusted, the temperature control heating assembly 4 in that area starts to work, and the heat generated mainly acts on the mortar material in this area. At this time, under the action of the heat insulation layer 7, the high-density aluminum silicate cotton reduces the heat conduction to the adjacent area through its good heat insulation performance, and the aluminum foil reflective film reflects the radiant heat back to the heating area. This double heat insulation mechanism ensures that the temperature rise of the adjacent area is controlled within a very small range, thereby avoiding the accidental melting of the mortar in the non-target area. The heat insulation layer 7 effectively prevents the cross-regional propagation of heat, and the control system can accurately control the melting process of the mortar in the target area without interfering with other areas. This precise temperature control makes the counterweight adjustment more controllable and predictable, further improving the reliability and stability of the system.

[0059] Figure 3 is a local enlarged structure schematic view of the adjusting hole provided by the embodiment of the present application, see Figure 3Each of the four independent low, medium and high three independent regions is provided with an adjusting hole 6, the adjusting hole 6 is arranged above the heat insulation layer 7 and closely arranged with the heat insulation layer 7, and the three independent regions are provided with a total of 12 adjusting holes 6. A stainless steel sleeve is arranged in the adjusting hole 6 to prevent hole wall wear and tear, prolong the service life, and ensure smooth flow of the mortar. The three regions of each independent sand box can work independently or cooperatively, providing flexible and diverse solutions for the gravity control in the bridge rotation process. Since the three regions are relatively independent, the failure of a region will not affect the normal work of other regions, improving the reliability of the system. At the same time, the partition design is convenient for maintenance and repair. If a problem occurs in a region, targeted repair can be carried out without affecting the operation of the entire system.

[0060] The soluble mortar is designed to have a melting point of 75-95°C to adapt to the construction environment temperature, and will not naturally ablate under non-heating state; when heated to 100-110°C, the flowability is best, and the mortar can completely flow out of the adjusting hole within 30s. After cooling, the high strength ensures that the sealing layer is not damaged in the construction vibration, and the weight stability error is ≤0.5%, ensuring the accuracy of the counterweight.

[0061] In some embodiments, the temperature control heating assembly 4 includes a silica gel heating ring and a temperature sensor, the silica gel heating ring closely fits the stainless steel sleeve of the adjusting hole 6, has high heating efficiency (the temperature rises to 100°C within 10s after power-on), and the flexible material can adapt to the shape of the sleeve to avoid local overheating. The PT1000 temperature sensor accurately monitors the temperature of the sealing layer and feeds back to the controller in real time to realize "temperature closed-loop control". When the temperature reaches 105°C (set value), the heating power is automatically reduced to maintain a constant temperature and prevent the mortar from overheating and carbonizing; when the temperature exceeds 120°C, the device is immediately powered off to avoid damage. Each sand box has an independent heating controller, which can independently control the 12 adjusting holes 6 in the three regions, realize "precise to hole" adjustment, and improve the control flexibility.

[0062] When the temperature control heating assembly 4 starts to work, heat is transferred to the soluble mortar by conduction, causing the temperature to gradually rise. As the temperature reaches a certain transition point, the internal structure of the mortar material begins to change, and the material gradually transitions from a solid to a liquid state. This phase change process is controllable and reversible, and the flowability of the mortar gradually increases with the increase of temperature, and finally reaches a suitable flow state. In the liquid state, the mortar has appropriate viscosity characteristics, which can smoothly flow out of the adjusting hole 6, and will not cause control difficulty due to excessive flow. The flowed-out mortar is collected in a special recycling device for subsequent recycling and processing, embodying the design concept of resource recycling.

[0063] This counterweight adjustment method, based on the phase change characteristics of temperature response, simplifies the system structure by eliminating complex transmission components compared to traditional mechanical adjustment mechanisms. The adjustment process is smoother and more continuous, enabling stepless adjustment and avoiding the abrupt changes that may occur with traditional methods. The entire adjustment process is achieved by controlling the temperature, making system control more precise and reliable.

[0064] In some embodiments, control component 5 includes a PLC main control unit, a manual control module, and an alarm unit. The PLC main control unit has a built-in center of gravity adjustment algorithm. Control component 5 uses an S7-1200 PLC as the main control core. The built-in asymmetric rotation center of gravity adjustment algorithm can quickly calculate the adjustment amount based on the rotation parameters. For example, for a 3500t rotating bridge with a span of 120m and a current tilt angle of 0.2°, the algorithm can output the instruction "150kg of mortar needs to flow out from the high area of ​​the sand box on the south side", with a response time of <1s. The touch screen intuitively displays various data, allowing construction personnel to monitor the status in real time. The execution unit precisely controls the power supply of designated heating coils to avoid misoperation. The manual control module serves as a backup mechanism for the automatic system. In the event of an automatic system failure, heating can be directly started via a button to ensure uninterrupted adjustment. The alarm unit integrates multiple sensor signal processing functions to monitor key parameters of the system in real time. It provides timely warnings when the center of gravity shift exceeds the threshold, the temperature is abnormal, or mortar leakage occurs, giving construction personnel time for emergency response.

[0065] The workability of the soluble mortar works closely with other components such as the temperature control heating component 4 and the control component 5 to form a complete regulation system. When the sensor detects a signal that requires regulation, the control system calculates the required regulation amount and then precisely achieves the expected outflow by controlling the heating power and time.

[0066] This application also provides an embodiment of a method for installing a counterweight sand box for adjusting the center of gravity of a bridge, specifically including:

[0067] In the construction of an asymmetric swing bridge, the first step in adjusting the center of gravity is to precisely install the experimental device (i.e., the counterweight sand box system in this embodiment) on the shorter side of the bridge deck. This side usually requires counterweight compensation due to structural asymmetry. The monitoring agency begins to continuously monitor the bridge's condition, collecting various bridge data in real time through sensors placed at key locations, including but not limited to parameters reflecting the center of gravity position such as bridge deck inclination angle, swing hinge stress state, and main beam deflection.

[0068] The collected multi-channel bridge deck data is transmitted via signal cables to the main control unit in control component 5 of the sand box system. The collected data is then sent to the PLC main control unit, which performs preprocessing operations including digital filtering, signal amplification, and error compensation. The filtering algorithm effectively eliminates electromagnetic interference on-site, the amplification circuit improves the signal-to-noise ratio, and the preprocessed clean data is synchronously transmitted to the algorithm controller with a built-in center of gravity adjustment algorithm.

[0069] The algorithm controller, based on the bridge rotation mechanics model and combining real-time data with preset parameters (such as rotation weight, span, and current rotation angle), accurately calculates the mass of counterweight mortar to be discharged from a specific sand box area by solving the equilibrium equation. This calculation process fully considers the hysteresis effect and dynamic response characteristics of the adjustment. After determining the adjustment scheme, the system sends a command to the temperature-controlled heating component 4 in the target area, which heats the soluble mortar in different height areas (low, medium, or high areas) to cause a phase change, thereby achieving precise dynamic adjustment of the center of gravity of the asymmetric bridge.

[0070] According to a predetermined adjustment strategy, the PLC main control unit in control component 5 sends a sequence of control commands, including timing and power, to the driver of the corresponding array-type independent sand box component 3. First, the PLC main control unit sends an unlocking signal to the mechanical locking mechanism, which is used to fix internal components during non-adjustment periods to prevent malfunction. After unlocking, the control system precisely controls the opening of the target adjustment hole 6 (by heating the sealing mortar to flow), and the soluble mortar flows into the preset flow gap or collection channel under gravity. After the outflow process is completed, the PLC main control unit immediately commands the locking mechanism to reset and lock, ensuring the system returns to a stable state.

[0071] After an adjustment is completed, the testing agency immediately initiates a new round of data acquisition to verify whether the bridge's unbalanced bending moment deviation has been corrected to the safe range allowed by the design. This verification process compares the new sensor readings with the algorithm's predicted results. If the data indicates that the deviation still exists and exceeds the threshold, the system automatically repeats the above adjustment process until the bridge's center of gravity posture reaches and stabilizes within the preset accuracy requirements, thereby ensuring the safety of the rotation construction and the accuracy of the closure.

[0072] The components in the accompanying drawings of this invention are for illustrative purposes only and are not intended to represent specific dimensions. The specific dimensions are determined based on actual production requirements, and the materials of each component can be replaced as needed.

[0073] All electrical components in this invention are commercially available conventional devices known to those skilled in the art. Models can be selected or customized according to actual needs. The setting method, installation method and electrical connection method can be easily understood by those skilled in the art by following the instructions for use, and will not be described in detail here.

[0074] The above embodiments are merely illustrative examples and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this application.

Claims

1. A counterweight sand box for bridge gravity center adjustment, characterized in that, The application relates to a weight sand box, which comprises a weight sand box shell, a bottom base weight block assembly (2), an arrayed independent sand box assembly (3), a temperature control heating assembly (4) and a control assembly (5). The weight sand box shell is composed of a protective steel plate assembly (1). The bottom base weight block assembly (2) is arranged at the bottom of the weight sand box shell. The arrayed independent sand box assembly (3) is arranged in the weight sand box shell and comprises a plurality of independent sand boxes, each of which is filled with soluble mortar and is provided with adjusting holes (6) around the periphery. The temperature control heating assembly (4) corresponds to the adjusting holes (6) and is arranged at the hole openings of the adjusting holes (6) and is configured to automatically heat the soluble mortar to make it flow according to the temperature. The control assembly (5) is connected with the temperature control heating assembly (4) and is configured to control the temperature control heating assembly (4) to perform a heating operation to realize weight adjustment. The protective steel plate assembly (1) is made of low-alloy steel plate, the outer surface is provided with an anti-corrosion coating, and the inner surface is provided with a waterproof film.

2. A counterweight sand box for bridge gravity center adjustment according to claim 1, characterized in that, The bottom base weight block assembly (2) adopts a modular design and comprises gray cast iron blocks or concrete precast blocks, and the concrete precast blocks are internally provided with a steel mesh reinforcement structure.

3. A counterweight sand box for bridge gravity center adjustment according to claim 1, characterized in that, The arrayed independent sand box assembly (3) is divided into a plurality of independent areas along the height direction and comprises a low area, a middle area and a high area, each area corresponds to a different weight adjustment level, and adjusting holes (6) are arranged around the periphery of each area.

4. A counterweight sand box for bridge gravity center adjustment according to claim 1, characterized in that, Heat insulation layers (7) are arranged between the independent areas, and the heat insulation layers (7) comprise high-density aluminum silicate cotton and aluminum foil reflective film.

5. A counterweight sand box for bridge gravity center adjustment according to claim 4, characterized in that, The soluble mortar flows in a heated state and is fixed and sealed in a cooled state.

6. A counterweight sand box for bridge gravity center adjustment according to claim 1, characterized in that, Stainless steel sleeves are arranged in the adjusting holes (6).

7. A counterweight sand box for bridge gravity center adjustment according to claim 1, characterized in that, The temperature control heating assembly (4) comprises a silica gel heating ring and a temperature sensor, and the silica gel heating ring is closely attached to the stainless steel sleeve of the adjusting hole (6).

8. A counterweight sand box for bridge gravity center adjustment according to claim 7, characterized in that, The arrayed independent sand box assembly (3) is made of glass fiber modified polypropylene material and is internally provided with a polytetrafluoroethylene coating.

9. A counterweight sand box for bridge gravity center adjustment according to claim 1, characterized in that, The control assembly (5) comprises a PLC main control unit, a manual control module and an alarm unit, and the PLC main control unit is internally provided with a gravity center adjustment algorithm.

10. A counterweight sand box for bridge gravity center adjustment according to claim 1, characterized in that, ​

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