28 results about "Counterforce" patented technology

The application belongs to the technical field of static test, and relates to a quasi-static test device. The device comprises a support frame, two first hydraulic push rods symmetrically arranged on the support frame, a sliding block, a pressure frame slidably connected to the sliding block, a base fixed to the lower part of the support frame, connecting frames symmetrically arranged and slidably connected to the base, a counterforce frame rotatably connected to the connecting frames, torsional springs fixed between the counterforce frame and the connecting frames, and extrusion frames symmetrically arranged and slidably connected to the base. The positions of the two extrusion frames are adjusted to determine the position of the counterforce frame for supporting the sample, so that the end-fixed sample and the end-hinged sample are simulated. The height of the extrusion frame is changed to adjust the compression degree and the inclination degree of the counterforce frame during force receiving, so that the quasi-static test of the sample under various boundary conditions is realized, and the diversity of test results is improved.

The application discloses a high-efficiency shield split launching and tunneling construction method, which comprises the following steps: S1, first-time main machine tunneling; S2, second-time main machine, equipment bridge, 1# and 2# trolley tunneling; and S3, third-time whole machine launching and tunneling. The shield split launching and construction is divided into three tunneling processes by adopting the method of shield body assembling in a shaft launching shaft, stage tunneling, and moving the counterforce frame forward after removing the negative ring segment in advance. The three-time split launching can realize the high-efficiency shield split launching and construction even under the condition of the single shaft narrow space. After the first-time main machine split launching and tunneling for a certain distance, the negative ring segment is removed in advance, the counterforce frame is moved to the hole end, the single shaft can provide the space for the subsequent trolley to go down the shaft, the vertical transportation space of the tunneling construction is increased, the input of a plurality of extension pipelines is reduced, the tunneling construction efficiency is improved, the whole machine tunneling is realized through the three-time process conversion, and the construction cost and the construction difficulty are effectively reduced.

The utility model relates to an inspection device for calibrating the output coefficient of a hydraulic steel sleeper, which comprises an inspection bench main body, an output mechanism, a counter-force mechanism and a pressure measurement system, and is characterized in that the inspection bench main body comprises a base and a support frame, and the base and the support frame are arranged at an interval along the height direction of the inspection bench main body; the output mechanism comprises a jack, an oil pump and an oil pipe, the jack is directly or indirectly arranged on the base, and the oil pipe is connected with the oil pump and the jack; the counter-force mechanism and the output mechanism are oppositely arranged, at least part of the counter-force mechanism is located on the upper side of the supporting frame, the counter-force mechanism comprises a force transmission column and a counter-force plate, the counter-force plate is arranged on the side, away from the jack, of the force transmission column, and the counter-force plate abuts against the fixing face and can bear the pressure of the jack; the pressure measuring system is used for monitoring pressure values of the jack and the steel sleeper and displaying monitoring data. The inspection device for calibrating the output coefficient of the hydraulic steel sleeper can accurately calibrate the output coefficient and the stability of the hydraulic steel sleeper, and provides reliable technical support for the detection of water-power engineering steel sleepers.

The application provides a kind of sea work steel sample machining gap excess material auxiliary take-out device and take-out method, realize the high-quality high-efficiency take-out of the excess material in the large-size sample machining gap, and the overall volume of the take-out device is small, light in weight, stable and reliable in structure, can be used with the existing three-point bending tooling and fatigue testing machine, without any change to the existing equipment and tooling, the take-out device can apply a larger force to the excess material in the gap at a slower rate by the integral counterforce structure design, without damaging the shape of the machined gap root, ensuring the accuracy and effectiveness of the test results, while the overall structure is simple, easy to disassemble and maintain.

The application discloses a method for continuously removing a leading beam before incremental launching construction, which installs a hanger fixing device and a hanger structure on a bent cap as a fixing base of a jacking equipment and a counterforce support portal, so that the jacking equipment and the counterforce portal can form supports at the bottoms of two different leading beam sections respectively, when the leading beam is removed, the first leading beam section at the front end is jacked up to the top of the second leading beam section at the rear end by the jacking equipment, then the first leading beam section is pulled to slide along the second leading beam section to the rear end by a sliding mode, so that the leading beam is removed section by section while the incremental launching is performed; the application can effectively reduce high-altitude operation in the leading beam removal work to reduce the construction safety risk, and realizes the continuous segmented removal of the leading beam to improve the construction efficiency.

This disclosure provides a reaction frame assembly, belonging to the field of bridge technology. The reaction frame assembly includes: a reaction frame, a tie rod, a locking element, and a pre-embedded sleeve for embedding in and passing through the cable tower. The reaction frame includes: a mounting plate, a locking seat, and a pushing seat. The locking seat is located on the surface of the mounting plate, and the pushing seat is located on the side of the mounting plate. The locking seat has a first through hole passing through it. The mounting plate has second through holes corresponding to the first through holes, and the first through holes and the corresponding second through holes are coaxial. The tie rod is inserted into the first through hole, the second through hole, and the inner hole of the pre-embedded sleeve. One end of the tie rod protrudes from the side of the locking seat away from the pre-embedded sleeve, and the other end of the tie rod protrudes from the end of the pre-embedded sleeve away from the reaction frame. Both ends of the tie rod are provided with locking elements, which are detachably connected to the tie rod. This disclosure allows for multiple reuses, avoiding waste caused by cutting up the reaction frame after use.

The application discloses a structure for providing counterforce for secondary launching of a variable-diameter shield machine after in-hole diameter expansion, comprising a small-shield tail ring cavity steel pipe piece, a diameter-expanding temporary support end wall steel pipe piece, a large-shield head ring cavity steel pipe piece and a counterforce conversion steel rib plate structure; the small-shield tail ring cavity steel pipe piece is arranged at the tail end of a small-shield conventional concrete pipe piece, the diameter-expanding temporary support end wall steel pipe piece is arranged at the outer periphery of the small-shield tail ring cavity steel pipe piece, the large-shield head ring cavity steel pipe piece is fixedly arranged at one side of the diameter-expanding temporary support end wall steel pipe piece, the counterforce conversion steel rib plate structure is fixedly arranged at the inner peripheral surface of the large-shield head ring cavity steel pipe piece, and the counterforce conversion steel rib plate structure is fixedly connected with the diameter-expanding temporary support end wall steel pipe piece and the small-shield tail ring cavity steel pipe piece. Through the above arrangement, the application can set a structure system of an existing small-shield tunnel pipe piece and a stable bedrock attached thereto, so that the structure system has a clear stress transmission path, high bearing capacity and safety and reliability.

The invention discloses a two-roll 220kV transformer suitable for the altitude of 5000 meters, and relates to the field of transformers, the two-roll 220kV transformer comprises an adjusting mechanism and an oil conservator installed on the top of the adjusting mechanism, a lifting mechanism is installed on one side of the adjusting mechanism, and a transformer body is installed on the top of the lifting mechanism. The height of the sliding frame and the height of the lifting frame are adjusted through driving of an air cylinder so as to meet the requirements of different altitudes and site positions, height locking is achieved through clamping connection of a locking block and a control box, the stability and safety of the adjusting process are ensured, a driving motor drives a rotating rod to rotate, and an eccentric wheel and a center groove are matched to apply counter-acting force to control lifting of the sliding frame; when the inclined face of the locking block makes contact with the control box, the lifting direction of the lifting frame and the sliding frame is determined, the locking block is pushed to make contact with the supporting column through the elastic effect of the mounting groove, the precise locking height is ensured, the locking block and the sliding rod move together through sliding of the sliding rod in the mounting groove, and precise adjustment of equipment is ensured through coordination and cooperation of all components.

The invention discloses a center pillar failure simulation test device for studying progressive collapse resistance of a steel frame structure, which comprises a test substructure, a reaction wall, an MTS actuator, an oil jack, a mechanical jack, a sliding support assembly, a mechanical sensor, a pressure beam, a steel pier, a boundary condition updating system and a data interaction control system, the device can collect the displacement of the test piece in real time, perform data interaction with a numerical model, dynamically update the boundary load, realize the relationship between a neutral substructure and a residual system in progressive collapse test research, break through the technical bottleneck of fixed boundary of the traditional anti-collapse test, and greatly improve the test precision of the anti-collapse test of the substructure.

The embodiment of the application provides a determination method of a support leg counterforce digital twin model and a support leg counterforce determination method. The determination method of the support leg counterforce digital twin model comprises the following steps: determining a plurality of working condition parameter types of an engineering equipment related to the support leg counterforce and a plurality of working condition parameter groups containing the plurality of working condition parameter types, then determining a support leg counterforce theoretical value, a support leg counterforce simulation value and a support leg counterforce actual value corresponding to each working condition parameter group, and determining the support leg counterforce digital twin model according to the three kinds of support leg counterforce values and the plurality of working condition parameter groups. After the support leg counterforce digital twin model is transplanted to the engineering equipment, the model can be directly applied to the detection of the support leg counterforce. The processor only needs to input the working condition parameters of the engineering equipment into the model, and the corresponding support leg counterforce can be obtained, so that the detection of the support leg counterforce is more accurate, and the safety monitoring of the engineering equipment is facilitated. Moreover, the model can not only be used for the counterforce monitoring in operation, but also can be used for the counterforce prediction before operation.

The invention provides a counter-force frame for a shield launching opening negative ring and a construction method of the counter-force frame. The counter-force frame comprises a pi-shaped beam, a transverse beam and a transverse beam, the two stand columns are parallel to the plane where the pi-shaped beam is located, and the upper portion of each stand column is connected with the oblique beam on the corresponding side through a set of connecting pieces; the two sets of connecting pieces are correspondingly arranged between the two oblique beams and the stand columns on the corresponding sides respectively. Wherein each group of connecting pieces comprises a plurality of connecting pieces; the supporting assembly comprises two inclined struts and two groups of first horizontal struts; one ends of the two inclined struts are correspondingly connected with the middle parts of the two upright posts respectively; the two first horizontal supports are correspondingly and vertically arranged on the lower portions of the two stand columns respectively. Through the structural design of the counter-force frame, the counter-force frame is suitable for providing counter-force in the shield tunneling machine propelling process when the negative ring is a split ring, the counter-force frame can be installed and fixed without full-ring splicing of the negative ring, the using amount of negative ring materials is effectively reduced, time consumed for splicing and dismounting of the negative ring is reduced, and the construction efficiency is improved.

The invention relates to the field of pile foundation detection, and particularly discloses a pile foundation self-balancing counter-force device and a pile foundation detection method.The pile foundation self-balancing counter-force device comprises a steel reinforcement cage, a counter-force box and a detection module, the steel reinforcement cage comprises vertical steel bars, annular steel bars and at least three guide steel bars, the guide steel bars are vertically arranged and evenly distributed with the vertical steel bars, and the counter-force box is connected with the detection module; the annular reinforcing steel bars are bound on the vertical reinforcing steel bars and the guide reinforcing steel bars, and a first guide groove and a second guide groove are formed in the side, facing the interior of the reinforcement cage, of each guide reinforcing steel bar; the counter-force box is arranged in the second guide groove in a sliding mode, and the detection module is arranged in the first guide groove in a sliding mode. The detection module comprises an industrial camera. The invention aims to solve the technical problem of how to determine the friction force balance point.

The application discloses a shield cutting line launching method, which is characterized in that numerical control jacks and counterforce frames are respectively arranged on two sides of a launching bracket, when it is needed to adjust the launching posture of the shield to one side, the numerical control jack on the side only plays a supporting role, and the launching posture is adjusted by controlling the numerical control jack on the other side to generate a thrust force, so that the launching posture of the shield can be adjusted after the shield body is hoisted, and the center line of the shield machine can be kept in the line design curve cutting line direction excavation. Moreover, when the launching posture is adjusted, whether the launching posture meets the design requirement can be preliminarily estimated, the shield design parameter can be adjusted in time when the launching posture does not meet the design requirement, the shield posture parameter is calculated based on the shield design parameter, and the thrust force values of the numerical control jacks are calculated based on the shield posture parameter. The application firstly proposes a calculation model for calculating the thrust force values of the numerical control jacks based on the shield design parameter, and the calculation model can be well applied to the posture adjustment in the shield cutting line launching stage.

The invention provides an overall launching method for an ultra-buried-depth large-diameter EPB-TBM dual-mode shield, and relates to the technical field of shield tunnel construction.The method comprises the steps that a vertical shaft, a front pilot tunnel and a rear blind hole which communicate with one another are sequentially excavated and supported; a starting base and a rear steel frame are installed in the vertical shaft, and a main machine part of the shield tunneling machine is hoisted to the shaft and assembled on the starting base; the assembled main machine part of the shield tunneling machine is pushed forwards in an empty mode in the front pilot tunnel, and a plurality of trolleys used in a matched mode are synchronously and sequentially assembled behind the main machine part of the shield tunneling machine; a counter-force ring beam is poured in the tunnel face area of the front pilot tunnel, and a continuous deslagging system is installed in a composite space formed by the vertical shaft, the front pilot tunnel and the rear blind hole; and after the counter-force ring beam reaches the first design strength, the shield tunneling machine is started to conduct overall starting tunneling, and continuous deslagging is conducted through a continuous deslagging system. The shield launching time is greatly shortened, the large-area foundation pit excavation link is omitted, the construction cost is remarkably saved, and the construction efficiency of the ultra-buried-depth large-diameter tunnel can be improved.

The invention discloses a structure for providing counter-force for secondary starting of a variable-diameter shield machine after diameter expansion in a hole. The structure comprises a small shield tail ring cavity steel pipe piece, a diameter expansion temporary support end wall steel pipe piece, a large shield head ring cavity steel pipe piece and a counter-force conversion steel rib plate structure. The small shield tail ring cavity pipe piece is arranged at the tail end of the small shield conventional concrete pipe piece, the expanding temporary support end wall steel pipe piece is arranged on the periphery of the small shield tail ring cavity pipe piece, and the large shield head ring cavity steel pipe piece is fixedly arranged on one side of the expanding temporary support end wall steel pipe piece. The counter-force conversion steel rib plate structure is fixedly arranged on the inner circumferential face of the large shield head ring cavity steel pipe piece, and the counter-force conversion steel rib plate structure is fixedly connected with the expanding temporary support end wall steel pipe piece and the small shield tail ring cavity pipe piece. By means of the arrangement, the structure system can be arranged on the existing small shield tunnel segment and the stable bed rock attached to the small shield tunnel segment, so that the structure system is clear in stress transmission path, high in bearing capacity, safe and reliable.

The application provides an EPB-TBM double-mode shield whole launching method for super deep and large diameter, and relates to the technical field of shield tunnel construction.The method comprises the following steps: excavating and supporting a vertical shaft, a pilot tunnel and a rear blind hole in sequence to form a mutual communication; installing a launching base and a rear steel frame in the vertical shaft, hoisting the main machine components of a shield machine into the vertical shaft and assembling the main machine components on the launching base; pushing the assembled main machine components forward in the pilot tunnel and synchronously assembling multiple trolleys used in sequence in the rear; pouring a counterforce ring beam in the tunnel face area of the pilot tunnel, and installing a continuous slag removal system in the composite space formed by the vertical shaft, the pilot tunnel and the rear blind hole; starting the shield machine to perform whole launching and excavation when the counterforce ring beam reaches the first design strength, and continuously removing slag through the continuous slag removal system.The method not only greatly shortens the shield launching time, saves the large-area foundation pit excavation link and significantly saves the construction cost, but also improves the construction efficiency of super deep and large diameter tunnels.

The application discloses a perlite lateral pressure test device, which comprises a test box, a sliding plate and a loading mechanism. The test box comprises a base, a fixed back plate, a fixed top plate and two fixed side plates. The fixed back plate and the fixed side plates are fixedly installed on the base. The two fixed side plates are located on the left and right sides of the fixed back plate. The fixed top plate is fixedly installed on the fixed side plates and the fixed back plate to enclose a test chamber. The sliding plate is arranged vertically and is transversely movably arranged in the test chamber. The sliding plate is installed with a plurality of pressure sensors arranged vertically and spaced apart. An elastic felt is fixed on the side of the sliding plate facing the fixed back plate. Expanded perlite is filled between the elastic felt and the fixed back plate. The loading mechanism comprises a counterforce frame and a servo actuator. The counterforce frame is transversely arranged between the two fixed side plates. The counterforce frame is installed on the fixed side plates. The servo actuator is installed on the counterforce frame and is fixedly connected with the sliding plate.

The present application belongs to the technical field of large bridge sinking well construction, and relates to a large sinking well foundation suspension type in-situ test reaction force system and a construction method. The system comprises a sinking well foundation and a plurality of embedded pipes embedded in the bottom section of the sinking well foundation, wherein a steel rod is arranged in the embedded pipe. The steel rod can extend out of the well wall or the partition beam outside the bottom section of the sinking well foundation and is sleeved with a steel beam. A rigid bearing plate is arranged below the steel beam. A jack is arranged between the rigid bearing plate and the bottom of the steel beam. A plurality of displacement sensors are arranged on the rigid bearing plate. The displacement sensors are connected with a static load tester for real-time recording of in-situ test pressure and sinking amount data. The present application can improve the operation space of the test and detection personnel in the well cabin of the large sinking well foundation, and the test can be carried out at any point position in the well cabin, even close to the well wall. The present application can not only meet the principle of randomly selecting test points, but also meet the requirement of carrying out the test at the most unfavorable position.

The utility model relates to the field of bridge building detection, and discloses a reinforcing layer foundation reliability detection device, which comprises a detection mechanism and a fixing mechanism, the detection mechanism comprises a control console and a retaining frame, the bottom of the control console is fixedly connected with a bottom plate, the front end face of the control console is fixedly connected with an ultrasonic-rebound comprehensive detector and a ground penetrating radar, and the retaining frame is fixedly connected with the ultrasonic-rebound comprehensive detector. A fixing plate is movably connected to the position, located at the front end of the console, of the top of the bottom plate, a counter-force frame is fixedly connected to the top of the fixing plate, the fixing mechanism comprises two screws, the outer walls of the two screws are in threaded connection with fixing blocks, the outer walls of the two fixing blocks are fixedly connected with protruding plates, and a jack is fixedly connected to the rear end face of the counter-force frame. According to the utility model, through the arrangement of the detection mechanism, multiple detection functions are integrated, carrying and operation are convenient, the detection efficiency is improved, and through the arrangement of the fixing mechanism, data during load detection are more stable.

The utility model discloses a locking structure of contactor for ship, include: counterforce mechanism includes connecting rod, and connecting rod is connected with support, interlocking piece and connecting rod cooperation form first locking portion, second locking portion, and interlocking piece is equipped with interlocking hole, and first locking portion, second locking portion form the connecting fixed of connecting rod and interlocking piece, drive assembly includes drive source and lock bolt, and drive source drives lock bolt to move, and the state of opening and closing, and lock bolt extends to interlocking hole, and lock bolt locks interlocking piece, and the state of closing, and lock bolt is from interlocking hole and extends, and connecting rod drives interlocking piece to move, this structure, simple structure, locking effect is good, avoids the misoperation of contactor under the vibration environment, improves the stability of contactor work.

The invention provides a disassembly system for interference fit parts of a ship chamber working door of a ship lift in a narrow space and a use method. The system is formed by integrating a positioning module, a frame module, a hydraulic driving module and a hydraulic measurement and control module. The positioning module achieves centering and locking in the X direction, the Y direction and the Z direction, the frame module provides rigid counter-force supporting, the hydraulic driving module outputs continuous controllable drawing force, the measurement and control module collects force and displacement parameters in real time, and closed-loop control is achieved. The method solves the problems that a traditional method is narrow in space, difficult to center, prone to damaging equipment and the like, has the advantages of nondestructive disassembly, data driving, high adaptability and the like, and achieves rapid, accurate and safe disassembly operation. The device can be widely applied to the field of water conservancy and shipping equipment maintenance.

The application relates to the technical field of test equipment, and provides a shield tunnel segment joint test device and method.The device comprises a counterforce frame, a first force applying assembly arranged on a first inner wall of the counterforce frame, a loading basket detachably connected to the end of the first force applying assembly and clamping a segment, a pair of rod cylinder paste assemblies clamping two ends of the segment, wherein the first rod cylinder paste assembly is rotatably connected to the inner wall of the counterforce frame, a second force applying assembly, wherein the first end of the second force applying assembly is connected to a second inner wall, and the second end of the second force applying assembly is rotatably connected to a second rod cylinder paste assembly, and the second inner wall is perpendicular to the first inner wall.The device guarantees seamless fixing between the non-joint side of the segment and the inner wall of the counterforce frame, reduces energy loss and virtual displacement energy consumption, and thus ensures the accuracy and reliability of the test results.

The application relates to a limiting device for testing the out-of-plane instability of a frame, which comprises a limiting structure, the limiting structure comprising a counterforce frame and a limiting component, the counterforce frame being fixed to one side of a test piece, the limiting component comprising two groups of lateral connecting assemblies, two groups of middle connecting assemblies and at least two groups of pulley assemblies, wherein one side of the two groups of lateral connecting assemblies is connected with the counterforce frame, the other side is connected with the two groups of middle connecting assemblies, the two groups of middle connecting assemblies are oppositely arranged on the two sides of the test piece and are fixed with the pulley assemblies on the inner sides, and the two groups of middle connecting assemblies can be adjusted and positioned to the positions where the pulleys of the pulley assemblies press the sides of the test piece. The counterforce frame of the application is concentrated on the same side of the test piece, the space occupation of the test site is reduced, the performance change of the test piece can be observed by the tester on the other side, the test piece after the test can be detected, and the interference of the counterforce frame is avoided.

The utility model relates to the field of deviation rectifying reaction frames, and discloses a deviation rectifying reaction frame device for bridge incremental launching construction, which comprises a sliding plate, the top of the sliding plate is fixedly connected with a supporting plate, the left side of the supporting plate is fixedly connected with a fixing frame, and the inside of the fixing frame is fixedly connected with a hydraulic cylinder I; the output end of the first hydraulic cylinder is fixedly connected with a sliding frame, the front side of the sliding frame is fixedly connected with a second hydraulic cylinder, the interior of the sliding frame is slidably connected with a third hydraulic cylinder, the output end of the third hydraulic cylinder is slidably connected with a lantern ring, the top of the lantern ring is fixedly connected with a rubber pad, and the output end of the third hydraulic cylinder is provided with a replacement assembly. And a cleaning assembly is installed on the right side of the sliding frame, and the replacement assembly comprises two inner shells. According to the utility model, the limiting frame is pushed by the spring I to drive the ball to be clamped in the lantern ring and fixed together with the rubber pad, so that the rubber pad can be quickly disassembled and assembled, the replacement is convenient, the operation is simple and convenient, time and labor are saved, and the replacement efficiency is effectively improved.

The utility model discloses an engineering material compression-torsion composite creep characteristic test system, which comprises a counter-force frame, a horizontal loading mechanism and an arc-shaped bearing plate, balls are embedded on the inner surface of the bearing plate, a torsion loading mechanism is placed above the bearing plate, the torsion loading mechanism comprises a plurality of torsion rollers with round exteriors and square interiors, and the torsion rollers are connected with the counter-force frame. Square holes penetrate through the central axes of the twisting rollers, a sample horizontally penetrates through the twisting rollers, a stand column is installed on the tops of the twisting rollers, a lifting rope is connected to the stand column, a lifting hook used for being connected with a weight is arranged at the lower end of the lifting rope, and angle values in a circumferential array are arranged on the side faces of the twisting rollers. A plurality of vertically downward pointers are slidably mounted on the lower surface of the top frame of the counter-force frame through sliding grooves. The creep characteristic testing system can be used for testing the creep characteristic of the sample under the working condition of single load of pressure load and torsion load or multiple composite loads, and in the testing process, the testing system can reduce the interference load influence on the sample and improve the testing accuracy.

The present application belongs to the technical field of waterproof test of underground structure, and particularly relates to a test device for testing waterproof performance of deformation joint. The device comprises a counterforce box, a jack, a pressurized closed water box, a water injection and pressurization hole and a pasted water-swelling rubber waterstop, the counterforce box is a rectangular frame with two opposite ends open, which is surrounded by a front panel, a back panel and two side panels, the jack is installed in the counterforce box and on the back panel, a rectangular boss is arranged in the middle of one end surface of the pressurized closed water box, a rectangular groove is processed on the other end surface, and the groove bottom of the rectangular groove extends into the rectangular boss, a water injection and pressurization hole is processed on the top side wall of the rectangular boss and communicates with the rectangular groove, a test piece with a deformation joint processed in the middle is arranged between the end surface with the groove and the front panel of the counterforce box. The device does not need special fixing conditions, has weak site requirement, and can simulate the actual water pressure condition in engineering, and quickly test the waterproof performance of the deformation joint part of underground engineering on the construction site.

This invention discloses a portable, small-tonnage pile pull-out reaction force testing device. It comprises a frustum-shaped reaction force steel cage consisting of two sets of four supporting steel pipes each, a bottom annular steel plate, a bottom circular steel hoop, a top annular steel plate, and several pins. All supporting steel pipes have circular holes at both ends. The top annular steel plate has a through hole in the center and is surrounded by annular lifting lugs. One supporting steel pipe from each set is connected and fixed to an adjacent annular lifting lug. The bottom annular steel plate has annular lifting lugs distributed around its inner and outer rings and around the bottom circular steel hoop. The innermost supporting steel pipe is connected and fixed to an adjacent annular lifting lug in the inner ring, while the outermost supporting steel pipe is connected and fixed to adjacent annular lifting lugs in the outer ring and the bottom circular steel hoop. Using this reaction force device, for pile pull-out testing with a bearing capacity below 800kN, it is easy to install and retract on-site, eliminating the need for large machinery such as cranes, significantly reducing costs, and broadening its applicability.