Square hoop lifting device

Abstract

The square hoop lifting device comprises two sets of supporting hoop mechanisms arranged in the height direction of a square pier column at intervals, and a plurality of hydraulic jacks are connected between the upper set of supporting hoop mechanism and the lower set of supporting hoop mechanism. The supporting hoop mechanism is composed of two sets of hoop assemblies and a plurality of inter-hoop stand columns supported between the two sets of hoop assemblies, each hoop assembly comprises a longitudinal friction plate, a transverse friction plate, a hoop longitudinal beam and a hoop cross beam, and the hoop cross beams and the hoop longitudinal beams are connected through opposite-pull screws to form a square frame structure; an opposite-pulling locking device is arranged at one end head of the opposite-pulling screw rod. Pressure is applied to the friction plate through the hoop assembly so that the whole device can be fixed through the friction force between the friction plate and the square pier column, the weight of the device and the formwork load and personnel load in the construction process are transmitted to the square pier column, an embedded part does not need to be arranged in concrete, and the construction efficiency is improved. Anchoring-free reliable bearing is achieved.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering construction technology, and in particular to a square clamp lifting device. Background Technology

[0002] In bridge construction, square piers are typically constructed using formwork for concrete pouring, which requires continuous lifting as the pouring progresses in sections. Traditional hydraulic climbing formwork systems have several drawbacks. For example, the steel embedded parts rely on manual installation, which can lead to positional misalignment and insufficient anchorage, and their removal can affect the appearance of the concrete. Furthermore, the tie rod system uses threaded solid steel rods, requiring manual tightening of each rod individually, resulting in high labor intensity for workers. The bolt preload also depends on worker experience, leading to uneven stress distribution. During the climbing process, the tie rods may break under combined stress, potentially causing instability in the climbing formwork system and posing significant safety hazards. Additionally, traditional hydraulic climbing formwork systems have low levels of intelligence. Core hydraulic operations rely on manual intervention, lacking sensors and intelligent monitoring modules. This hinders real-time data collection and provides poor early warning of structural deformation and equipment malfunctions. Relying solely on manual inspections makes it difficult to detect potential risks.

[0003] Chinese invention patent application CN118756584A discloses an integrated construction device and method for high pier columns and cap beams. The technical solution includes a support frame, a climbing frame, and a lifting frame. The support frame is set outside the climbing frame and is detachably connected to it. The support frame is equipped with a movable template for pier column forming. The lifting frame is set on top of the support frame and is equipped with a lifting mechanism. The climbing frame is set outside the pier column and is used to drive the support frame and the lifting frame to rise along the pier column. The climbing frame includes a lifting frame, a first fixing frame, and a second fixing frame arranged sequentially from top to bottom. The lifting frame is detachably connected to the support frame. Multiple clamping components for clamping the pier column are evenly distributed along the circumference of the lifting frame, the first fixing frame, and the second fixing frame.

[0004] The technical solution of the above-mentioned patent is to fix the climbing formwork to the pier by setting up a clamping component. Although it is not necessary to pre-embed bolts in the pier during construction, it is still necessary to set up tie rods to lock the fixing frame inside the concrete to achieve climbing. Therefore, it still has the same drawbacks as the traditional hydraulic climbing formwork mechanism, and fails to solve the problems of needing to tighten manually, high labor intensity for workers, and uneven force. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a square clamp lifting device that can effectively reduce construction difficulty and improve climbing efficiency.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a square clamp lifting device, comprising two sets of supporting clamp mechanisms spaced apart along the height direction of the square pier column, with multiple hydraulic jacks connected between the upper and lower sets of supporting clamp mechanisms; the supporting clamp mechanism consists of two sets of clamp components and multiple clamp columns supported between the two sets of clamp components, the clamp component includes a longitudinal friction plate, a transverse friction plate, a clamp longitudinal beam and a clamp transverse beam, the two longitudinal friction plates and the two transverse friction plates are connected together and abut against the square pier column, the two clamp longitudinal beams are fixedly connected to the two longitudinal friction plates respectively, the two clamp transverse beams are fixedly connected to the two transverse friction plates respectively, the clamp transverse beams and the clamp longitudinal beams are connected by tie rods to form a square frame structure, and a tie locking device is provided at one end of one tie rod.

[0007] As an improvement to the above solution: both the clamp longitudinal beam and the clamp transverse beam are fixed with pre-tension rods extending along the length direction.

[0008] As an improvement to the above solution: the thickness of the clamp longitudinal beam and clamp cross beam gradually increases from the middle to both ends, forming two connecting seats that cooperate with the pre-tension rod. The two ends of the pre-tension rod pass through the two connecting seats respectively and are locked and fixed by nuts that abut against the outside of the connecting seats.

[0009] As an improvement to the above solution: the middle part of the clamping longitudinal beam and clamping cross beam is a hollow structure, and both ends of the clamping longitudinal beam and clamping cross beam are provided with reinforcing structures.

[0010] As an improvement to the above solution: the clamping crossbeam has a double-layer structure, and the clamping longitudinal beam passes through the gap between the upper and lower layers of the clamping crossbeam.

[0011] As an improvement to the above solution: multiple buckles are fixedly provided on both the longitudinal friction plate and the transverse friction plate, and the clamping longitudinal beam and clamping transverse beam are respectively connected to the longitudinal friction plate and the transverse friction plate through corresponding buckles.

[0012] As an improvement to the above scheme: the number of hydraulic jacks between the two sets of support clamping mechanisms and the number of clamping columns between the two sets of clamping assemblies are four, and they are fixedly installed at the four corners of the support clamping mechanism and the four corners of the clamping assembly respectively; the hydraulic jacks and clamping columns correspond one-to-one and are aligned in the height direction of the square pier column.

[0013] As an improvement to the above solution, it also includes stress sensors installed on the pre-tension rod and the tie rod. The hydraulic jack, stress sensors, and tie rod locking device are all electrically connected to the integrated control center located on the ground.

[0014] The beneficial effects of this invention are as follows: This invention uses a support clamp mechanism to support the equipment and formwork during the construction of square pier columns. Combined with hydraulic jacks positioned between the upper and lower sets of support clamp mechanisms, a coordinated climbing system is formed. The hydraulic jacks drive the two sets of support clamp mechanisms to perform lifting and lowering movements, lifting not only the upper support clamp mechanism but also the lower one, thus enabling the entire lifting device to continuously climb upwards as the square pier column is constructed. This invention applies pressure to the friction plate through the clamp assembly, using the friction between the friction plate and the square pier column to fix the entire device. This transfers the weight of the device itself, as well as the formwork load and personnel load during construction, to the square pier column. It eliminates the need for embedded parts in the concrete, achieving reliable load-bearing without anchorage. This effectively reduces labor intensity, lowers construction difficulty, improves construction efficiency, and ensures the integrity of the poured concrete. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the square clamp lifting device; Figure 2 A schematic diagram of the supporting clamp mechanism; Figure 3 This is a structural schematic diagram of the clamp assembly; Figure 4 This is a structural schematic diagram of the clamping longitudinal beam; Figure 5 This is a structural schematic diagram of the clamp beam.

[0016] The markings in the diagram are as follows: 100-square pier column, 200-support clamping mechanism, 211-longitudinal friction plate, 212-transverse friction plate, 213-clamping longitudinal beam, 214-clamping transverse beam, 215-pull rod, 216-pull locking device, 217-pretension rod, 218-buckle, 219-stress sensor, 220-clamping column, 300-hydraulic jack. Detailed Implementation

[0017] To facilitate understanding of the present invention, the invention will be further described below with reference to the accompanying drawings.

[0018] In the description of this invention, it should be noted that the terms "front", "rear", "left", "right", "up", "down", "inner", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0019] like Figure 1 and Figure 2As shown, the square clamp lifting device disclosed in this invention consists of a supporting clamp mechanism 200 and a hydraulic jack 300. The supporting clamp mechanism 200 is used to fix the entire square clamp lifting device to the square pier 100, and the hydraulic jack 300 is used to drive the entire square clamp lifting device to climb on the square pier 100. This invention achieves stable locking on the square pier 100 through the clamping action of the supporting clamp mechanism 200 and the hydraulic jack 300, which drives the supporting clamp mechanism 200 to rise and fall along the height direction of the square pier 100. Through their coordinated action, the two achieve stable locking on the square pier 100 and can transfer the load borne during construction to the square pier 100, realizing adaptive lifting during the climbing process. Through the clamping locking characteristics of the supporting clamp mechanism 200, this invention can adapt to different sizes and loads of square piers 100, providing flexible support for different square piers 100.

[0020] Specifically, such as Figure 1 and Figure 2 As shown, this invention provides two sets of support clamp mechanisms 200 on a square pier 100. These two sets of support clamp mechanisms 200 are spaced vertically along the height of the square pier 100, and multiple hydraulic jacks 300 are connected between the two sets of support clamp mechanisms 200. The hydraulic jacks 300 are continuous hydraulic rod type jacks. During installation, the cylinder of the hydraulic jack 300 is connected and fixed to the lower support clamp mechanism 200, and the top of the piston rod of the hydraulic jack 300 is connected and fixed to the upper support clamp mechanism 200, forming an integral frame system with the upper and lower sets of support clamp mechanisms 200 and the hydraulic jacks 300. This invention achieves the climbing of the entire square clamp lifting device on the square pier 100 through the alternating locking action of the two sets of support clamp mechanisms 200 in conjunction with the driving action of the hydraulic jacks 300. When the square clamp lifting device is climbing, the following procedure is followed: Initially, both the upper and lower sets of support clamp mechanisms 200 are locked, ensuring the overall structure is stable and bears the load. Then, the lower support clamp mechanism 200 is lifted, while the upper support clamp mechanism 200 remains locked to bear the full load, and the hydraulic jack 300 retracts. After the lower support clamp mechanism 200 is lifted to the preset height, it is relocked. Finally, the entire structure is lifted. After the lower support clamp mechanism 200 is locked and fixed, the upper support clamp mechanism 200 is released, and the hydraulic jack 300 performs the lifting operation, driving the upper support clamp mechanism 200 upward. After reaching the desired height, the upper support clamp mechanism 200 is relocked, completing one lifting cycle.

[0021] Specifically, such as Figures 1 to 3As shown, the support clamp mechanism 200 used in this invention consists of clamp components and clamp columns 220; each support clamp mechanism 200 includes two sets of clamp components and multiple clamp columns 220. The clamp components are used to clamp and lock onto the square pier column 100 to fix the device, and the clamp columns 220 are used to connect the two sets of clamp components to support and fix the clamp components.

[0022] The clamp assembly includes longitudinal friction plates 211, transverse friction plates 212, clamp longitudinal beams 213, and clamp transverse beams 214. Two longitudinal friction plates 211 are symmetrically arranged along the longitudinal direction of the square pier 100, and two transverse friction plates 212 are symmetrically arranged along the transverse direction of the square pier 100. Both the longitudinal and transverse friction plates 211 and 212 are tightly fitted to the surface of the square pier 100, forming a square friction system that matches the transverse cross-section of the square pier 100, providing friction for the entire square clamp lifting device. To ensure the strength and service life of the friction plates, both the longitudinal friction plates 211 and 212 are made of lightweight, high-strength, wear-resistant steel.

[0023] The longitudinal clamp beam 213 and the transverse clamp beam 214 are respectively connected and fixed to the longitudinal friction plate 211 and the transverse friction plate 212. The longitudinal clamp beam 213 and the transverse clamp beam 214 are connected by tie rods 215 to form a square frame structure. One end of the tie rod 215 is provided with a tie locking device 216. Two tie rods 215 are symmetrically arranged between the two longitudinal clamp beams 213 and the two transverse clamp beams 214. The diameter of the tie rods 215 is determined according to the load calculation of the square pier column 100 to ensure that the maximum vertical bearing capacity requirement can be met. After the clamping longitudinal beam 213 is fixedly connected to the longitudinal friction plate 211 and the clamping transverse beam 214 is fixedly connected to the transverse friction plate 212, the two clamping longitudinal beams 213 and the two clamping transverse beams 214 are pulled and locked together by the tie rods 215, thereby generating pressure on the longitudinal friction plate 211 and the transverse friction plate 212. Through the friction between the longitudinal friction plate 211 and the transverse friction plate 212 and the surface of the square pier column 100, the weight of the entire square clamping lifting device, as well as the formwork load and personnel load during the construction process, can be transferred to the square pier column 100, achieving the bearing effect of boltless anchoring and laying the foundation for subsequent lifting operations. The tension locking device 216 in this invention adopts a mechanical self-locking structure. It is powered by a built-in hydraulic system to drive the tension locking device 216 to rotate relative to the threaded tension screw 215. The tension screw 215 is tensioned, thereby applying prestress to the clamping longitudinal beam 213 and clamping transverse beam 214. The tension locking device 216 integrates a hydraulic drive module and a position sensor. It can drive the clamping longitudinal beam 213 and clamping transverse beam 214 to squeeze inward synchronously through synchronous hydraulic control, thereby pressing the longitudinal friction plate 211 and the transverse friction plate 212 to achieve uniform tightening of the square pier column 100.

[0024] Furthermore, such as Figures 2 to 5As shown, the present invention provides pre-tension rods 217 on both the longitudinal beam 213 and the transverse beam 214 of the clamp. The pre-tension rods 217 extend along the length of the corresponding longitudinal beam 213 or transverse beam 214. The thickness of the longitudinal beam 213 and the transverse beam 214 gradually increases from the middle to both ends, forming two connecting seats that mate with the pre-tension rods 217. The two ends of the pre-tension rods 217 pass through the two connecting seats respectively and are locked and fixed by nuts abutting against the outside of the connecting seats. As the main load-bearing components of the clamp assembly, the longitudinal beam 213 and the transverse beam 214 are structurally defined to form variable cross-sections, with a smaller cross-section in the middle and a larger cross-section at both ends. During construction, when an external force is applied to the tie rod 215 to tighten the clamp assembly, the middle area of ​​the clamp longitudinal beam 213 and the clamp transverse beam 214 will undergo displacement deformation away from the surface of the square pier column 100, thereby weakening the friction of the clamp assembly and reducing the vertical bearing capacity of the clamp assembly. To eliminate the aforementioned adverse effects, this invention applies prestress to the longitudinal beam 213 and the transverse beam 214 of the clamp by setting pre-tension rods 217. The two ends of the pre-tension rods 217 are connected to two connecting seats, and a preset tension is applied to the pre-tension rods 217 via a hydraulic tensioning device. As the tension gradually increases, the pre-tension rods 217 pull the middle section of the beam to generate a pre-camber. The magnitude of the pre-camber is calculated and determined. When the entire support system is completed and begins to bear load, the beam will undergo downward bending deformation under load. At this time, the pre-camber formed by the pre-tension rods 217 can precisely offset the bending deformation, keeping the beams of the longitudinal beam 213 and the transverse beam 214 in a straight state. Therefore, by setting pre-tension rods 217, this invention ensures that the longitudinal friction plate 211 and the transverse friction plate 212 maintain uniform contact with the surface of the square pier column 100, thereby ensuring that the entire square clamp lifting device can stably withstand the expected vertical load.

[0025] Furthermore, such as Figure 4 and Figure 5As shown, the present invention features a hollow structure in the middle region of the clamping longitudinal beam 213 and clamping transverse beam 214, and reinforced structures at both ends of the clamping longitudinal beam 213 and clamping transverse beam 214. The reinforced structures can be achieved by increasing the steel thickness and optimizing the cross-sectional shape, thereby increasing the bending stiffness of the end portions compared to the middle region. Furthermore, to facilitate the fit between the clamping longitudinal beam 213 and clamping transverse beam 214, the present invention uses a double-layer structure for the clamping transverse beam 214, allowing the clamping longitudinal beam 213 to pass through the gap between the upper and lower layers of the clamping transverse beam 214 during assembly. Multiple clips 218 are fixedly installed on both the longitudinal friction plate 211 and the transverse friction plate 212, and the clamping longitudinal beam 213 and clamping transverse beam 214 are connected to the longitudinal friction plate 211 and the transverse friction plate 212 respectively via corresponding clips 218. The buckle 218 adopts a slot-type buckle. A row of buckles 218 is fixedly installed on the upper and lower parts of the outer side of the longitudinal friction plate 211 and the transverse friction plate 212, so that the upper and lower ends of the two friction plates are fixed with a layer of clamping longitudinal beam 213 and clamping transverse beam 214 through the buckles 218, forming a double-layer connection structure composed of friction plates and beams.

[0026] Specifically, such as Figure 1 and Figure 2 As shown, the present invention has four hydraulic jacks 300 set between the two sets of support clamping mechanisms 200 and four clamping columns 220 set between the two sets of clamping assemblies, which are respectively fixed at the four corners of the support clamping mechanism 200 and the four corners of the clamping assembly; the hydraulic jacks 300 and the clamping columns 220 correspond one-to-one and are aligned in the height direction of the square pier column 100.

[0027] like Figure 2 and Figure 3As shown, this invention incorporates stress sensors 219 on both the pre-tension rod 217 and the tie rod 215, which collect stress and strain data in real time. An integrated control center is installed on the ground. The hydraulic jack 300, stress sensors 219, and tie rod locking device 216 are all electrically connected to the integrated control center via a wireless transmission module, enabling real-time data transmission. Through this design, the invention ensures the safety performance of the square clamp lifting device in complex construction environments and achieves monitoring and adaptive adjustment functions. After receiving the data transmitted by the stress sensors 219, the integrated control center compares it with preset safety thresholds using a built-in algorithm, thereby achieving precise control of the tension in the pre-tension rod 217 and the tie rod 215. When the data monitored by stress sensor 219 exceeds the upper limit threshold, the integrated control center transmits a pressurization command to the corresponding tensioning device 216. The hydraulic system of tensioning device 216 is activated, and the mechanical lock assembly is unlocked through the hydraulic unloading mechanism, causing the tension of the tie rod 215 to decrease slowly until the stress returns to a safe range. Then, the hydraulic system of tensioning device 216 stops working, and tensioning device 216 re-locks, maintaining the current tension state. When the data monitored by stress sensor 219 is below the lower limit threshold, the integrated control center transmits a pressure replenishment command to the corresponding tensioning device 216. The hydraulic system of tensioning device 216 is activated, and the tie rod 215 is slightly tensioned through the hydraulic drive assembly to replenish the tension to the designed range. Then, the hydraulic system of tensioning device 216 stops working, and tensioning device 216 enters an automatic locking, pressureless working state.

[0028] The integrated control center in this invention is deployed in a ground-based operating room. Through remote control commands, it enables intelligent operation of the entire square clamp lifting device, thereby reducing the amount of work required at height, lowering the risks associated with such work, and significantly improving construction efficiency and quality. The integrated control center possesses functions including data collection, data processing, command execution, real-time calibration, coordinated control, full-process monitoring, and intelligent safety early warning. The data collection function receives real-time status information from various sensors and actuators. The data processing function analyzes, stores, and visualizes the collected data. The command execution function translates coordinated control commands into actual equipment actions and tracks their status. The real-time calibration function verifies and adjusts data accuracy, equipment performance, and control logic in real time to ensure reliable system operation. The coordinated control function uniformly schedules the action sequence of various devices. The comprehensive monitoring function displays the structural status in real-time through a 3D simulation interface. The intelligent safety early warning function alerts operators through audible and visual alarms when abnormalities such as excessive stress or equipment malfunction occur.

[0029] When constructing the square clamp lifting device disclosed in this invention, the following steps shall be followed: Step 1: Install the support clamp mechanism below.

[0030] Before installing the support clamp mechanism 200 located below, the outside of the square pier 100 must be cleaned to ensure that the surface of the square pier 100 is free of debris, dust, or protrusions, so as to ensure the flatness and stability of the subsequent component installation.

[0031] When installing the lower support clamp mechanism 200, first use a truck crane on the ground to pass the clamp beam 214 through the buckle 218 on the back of the transverse friction plate 212, thereby connecting the clamp beam 214 and the transverse friction plate 212 together. Adjust the position of the clamp beam 214 so that the lengths of the clamp beam 214 protruding from the template at both ends are consistent. Finally, fix it to prevent the clamp beam 214 from shifting during subsequent installation and use. Then, follow the above steps to connect and fix the clamp longitudinal beam 213 to the longitudinal friction plate 211.

[0032] Using a truck crane, the longitudinal friction plate 211 and the transverse friction plate 212 are hoisted to the designated position on the outer side of the bottom of the square pier 100, so that the four friction plates enclose the square pier 100 and provide temporary support. Then, the tie rods 215 are installed, passing through the pre-drilled holes on the corresponding clamping longitudinal beam 213 and clamping transverse beam 214, ensuring that the exposed lengths at both ends of the tie rods 215 are consistent for subsequent locking operations. A tie-locking device 216 is installed on the tie rods 215, paying attention to the installation direction of the tie-locking device 216 during installation to ensure its proper functioning.

[0033] After the tie-locking device 216 is installed, install the stress sensor 219. The stress sensor 219 needs to be installed at the designated positions on components such as the tie rod 215, the pre-tension rod 217, and the friction plate back rib. During installation, ensure that the stress sensor 219 is in close contact with the components and is firmly connected to prevent the stress sensor 219 from loosening or falling off due to vibration or other reasons. Finally, install the clamp column 220 and firmly connect the clamp column 220 to the upper and lower clamp assemblies.

[0034] After all components are assembled, activate the tie-locking device 216 installed on the tie rod 215. During the locking process, monitor the changes in the stress sensor 219 in real time to ensure that the clamping longitudinal beam 213 and clamping transverse beam 214 are synchronously pressed inward, and the template is uniformly tightened inward. When the value of the stress sensor 219 reaches the preset initial value, stop the locking operation. Step 2: Install the hydraulic jack.

[0035] Before installing the hydraulic jack 330, the connection points of the lower support clamp mechanism 200, which has already been installed, must be inspected to ensure that the connection is secure and there is no looseness. At the same time, check whether the appearance of the hydraulic jack 330 is intact, whether all parts are complete, and whether there is any damage or leakage in the hydraulic pipeline. Use a truck crane to slowly lift the hydraulic jack 330 to the designated installation position. During the lifting process, keep the hydraulic jack 330 stable and avoid collisions with other components. Bolt the hydraulic jack 330 to the supporting clamp mechanism 200 below to ensure a firm and reliable connection. After the hydraulic jack 330 is installed, connect the hydraulic lines. After connection, test run the hydraulic system to check if the hydraulic jack 330's extension and retraction functions are normal, if the operation is smooth, and if there are any abnormal noises. If any problems are found, they must be investigated and dealt with promptly. Step 3: Install the upper support clamp mechanism.

[0036] Assemble the clamp assembly according to the assembly method in step one, ensuring that the connections of each component are precise and secure, laying the foundation for subsequent installation.

[0037] Assemble two longitudinal friction plates 211 and two transverse friction plates 212 into a square frame on the ground. Pass the tie rod 215 through the pre-drilled holes on the clamping longitudinal beam 213 and clamping transverse beam 214, ensuring that the exposed lengths at both ends of the tie rod 215 are consistent for subsequent locking operations. Install the tie rod locking device 216 on the tie rod 215, paying attention to the installation direction of the tie rod locking device 216 during installation to ensure its proper functioning.

[0038] After all ground assembly work is completed, the support clamp mechanism 200 is hoisted as a whole using a truck crane. During the hoisting process, the support clamp mechanism 200 must be raised slowly and steadily to the designated height, and then lowered slowly. Finally, it is connected and secured to the hydraulic jack 300. When connecting, it is essential to ensure that the connection points of the two are precisely aligned and that the connecting bolts are tightened properly to ensure that the support clamp mechanism 200 has sufficient stability during subsequent operations.

[0039] Step 4: Install the integrated control center.

[0040] After the upper and lower sets of support clamps 200 are installed, the deployment of the integrated control center and the connection of intelligent devices will be carried out immediately.

[0041] Select a suitable ground location to place the main cabinet of the integrated control center, and connect each stress sensor 219 to the integrated control center via the data acquisition module. Simultaneously, connect the power and control cables of the tensioning device 216. After connection, check all connections to ensure there are no loose or intermittent connections. Then, check through the integrated control center whether each device can power on normally and whether the indicator lights are displaying correctly. Step 5: Joint debugging and parameter calibration.

[0042] The signal transmission accuracy of each stress sensor 219 was tested one by one. Each stress sensor 219 was calibrated using a standard force calibration device. Different standard force values ​​were applied, and the output signals were recorded and compared with the standard values. For stress sensors 219 with errors exceeding the standard, adjustments or replacements were required until the requirements were met. The integrated control center sends control commands to the device, records the time from command issuance to device activation, and verifies whether the device can quickly initiate action after receiving the control command; the response time should meet design requirements. Overpressure and underpressure conditions are simulated by manually setting stress values ​​exceeding or falling below thresholds through the integrated control center, observing whether the system can automatically trigger pressure reduction and replenishment commands, checking the accuracy and timeliness of command execution, and ensuring reliable operation of the closed-loop control logic. The alternating tightening action of the upper and lower sets of support clamping mechanisms 200 and the lifting action of the hydraulic jack 300 were tested. The two sets of support clamping mechanisms 200 were controlled by the integrated control center to perform alternating tightening operations, observing whether the tightening process was smooth, whether there were any jams, and whether the tightening force was uniform. Simultaneously, the lifting action of the hydraulic jack 300 was tested to check whether the lifting speed was stable, whether the lifting height was accurate, and whether it could stop accurately according to instructions. Throughout the entire commissioning process, the operating status of each device must be monitored in real time, and relevant data must be recorded. Any problems that arise must be investigated and resolved promptly until the commissioning test is passed.

Claims

1. A square clamp lifting device, characterized in that: It includes two sets of support clamping mechanisms (200) spaced apart along the height direction of the square pier column (100), with multiple hydraulic jacks (300) connecting the upper and lower sets of support clamping mechanisms (200); the support clamping mechanism (200) consists of two sets of clamping assemblies and multiple clamping columns (220) supported between the two sets of clamping assemblies. The clamping assembly includes a longitudinal friction plate (211), a transverse friction plate (212), a clamping longitudinal beam (213), and a clamping transverse beam (214). The two longitudinal friction plates ( 211) and two transverse friction plates (212) are connected together and abut against the square pier column (100). Two clamping longitudinal beams (213) are fixedly connected to two longitudinal friction plates (211) respectively. Two clamping transverse beams (214) are fixedly connected to two transverse friction plates (212) respectively. The clamping transverse beams (214) and clamping longitudinal beams (213) are connected by tie rods (215) to form a square frame structure. One end of the tie rods (215) is provided with a tie locking device (216).

2. The square clamp lifting device as described in claim 1, characterized in that: Both the clamp longitudinal beam (213) and the clamp transverse beam (214) are fixed with pre-tension rods (217) extending along the length direction.

3. The square clamp lifting device as described in claim 2, characterized in that: The thickness of the clamp longitudinal beam (213) and clamp transverse beam (214) gradually increases from the middle to both ends and forms two connecting seats that cooperate with the pre-tension rod (217). The two ends of the pre-tension rod (217) pass through the two connecting seats respectively and are locked and fixed by nuts that abut against the outside of the connecting seats.

4. The square clamp lifting device as described in claim 3, characterized in that: The middle part of the clamping longitudinal beam (213) and clamping cross beam (214) is a hollow structure, and both ends of the clamping longitudinal beam (213) and clamping cross beam (214) are provided with reinforcing structures.

5. The square clamp lifting device as described in claim 1, characterized in that: The clamp beam (214) has a double-layer structure, and the clamp longitudinal beam (213) passes through the gap between the upper and lower layers of the clamp beam (214).

6. The square clamp lifting device as described in claim 1, characterized in that: Multiple buckles (218) are fixedly provided on the longitudinal friction plate (211) and the transverse friction plate (212). The clamping longitudinal beam (213) and the clamping transverse beam (214) are connected to the longitudinal friction plate (211) and the transverse friction plate (212) respectively through the corresponding buckles (218).

7. The square clamp lifting device as described in claim 1, characterized in that: The number of hydraulic jacks (300) between the two sets of support clamping mechanisms (200) and the number of clamping columns (220) between the two sets of clamping assemblies are four, and they are fixedly installed at the four corners of the support clamping mechanism (200) and the four corners of the clamping assembly respectively; the hydraulic jacks (300) and clamping columns (220) correspond one-to-one and are aligned in the height direction of the square pier (100).

8. The square clamp lifting device as described in claim 2, characterized in that: It also includes stress sensors (219) installed on the pre-tension rod (217) and the tie rod (215). The hydraulic jack (300), stress sensors (219) and tie rod locking device (216) are all electrically connected to the integrated control center located on the ground.

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