An intelligent real-time monitoring system for the vibration quality of cast-in-place box beams

Abstract

The present invention belongs to the field of bridge construction technology, and in particular, is an intelligent system for real-time monitoring of the vibration quality of cast-in-place box girders, comprising a data acquisition terminal, the data of which is connected to an intelligent gateway, and the data of which is connected to a cloud platform. The intelligent system for real-time monitoring of the vibration quality of cast-in-place box girders, by setting a data acquisition terminal and a construction control strategy based on intelligent positioning and density monitoring technology of concrete vibration, adopts Internet technology to aggregate the density monitoring data of each insertion point to the cloud platform in real time, dynamically adjusts construction parameters such as the insertion depth and vibration frequency of the vibrating rod, forms an intelligent concrete vibration construction control strategy, and verifies the concrete density monitoring data through an auxiliary vibration verification mechanism, thereby solving the problem that the quality of existing concrete vibration is usually judged by on-site construction personnel based on practical experience, resulting in missed vibration, under-vibration, and over-vibration, which affects bridge safety.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to an intelligent system for real-time monitoring of the vibration quality of a cast-in-situ box girder. Background Art

[0002] Vibration is a crucial step in the concrete construction process, ensuring the quality of concrete pouring and improving structural performance. Although self-compacting concrete uses intelligent material power to achieve the self-filling and self-compacting functions of concrete structures, its high sensitivity to temperature and construction, as well as its high cost, have restricted its further use. Vibration, with its low construction cost, wide application range, and high operability, still holds an irreplaceable position in concrete construction.

[0003] The quality of box girder concrete vibration is closely linked to concrete strength. Insufficient strength can lead to concrete crushing by the anchor plate at the beam head, as well as defects such as honeycombing and pitting. Traditionally, the quality of concrete vibration is judged by on-site construction personnel based on their practical experience, which can severely impact vibration quality, leading to missed, under-, and over-vibrations. Cast-in-place box girders are often used in large, continuous bridges, directly impacting their construction quality. However, due to imperfect construction techniques and quality control strategies for cast-in-place box girders, numerous defects have emerged, impacting bridge safety. Therefore, an intelligent system for real-time monitoring of cast-in-place box girder vibration quality is needed. Summary of the Invention

[0004] Based on the technical problem that the quality of existing concrete vibration is usually judged by on-site construction personnel based on their practical experience, which leads to missed vibration, under-vibration and over-vibration, affecting bridge safety, the present invention proposes an intelligent system for real-time monitoring of the vibration quality of cast-in-place box girders.

[0005] The present invention proposes an intelligent system for real-time monitoring of the vibration quality of cast-in-situ box girders, comprising a data acquisition terminal, wherein the data of the data acquisition terminal is connected to an intelligent gateway, the data of the intelligent gateway is connected to a cloud platform, and the data of the cloud platform is connected to a Web application.

[0006] The data acquisition terminal includes an RTK positioning system for vibration positioning, an ultrasonic concrete vibration density monitoring system for concrete vibration quality detection, and an auxiliary vibration verification mechanism.

[0007] Among them, the RTK positioning system is used to locate and detect the position of the vibrating rod used for vibrating cast-in-place box girder concrete.

[0008] Among them, the ultrasonic concrete vibration density monitoring system is used to monitor the vibration density of cast-in-place box girder concrete in real time.

[0009] Among them, the auxiliary vibration verification mechanism is used to assist in concrete vibration and density monitoring and verification of cast-in-place box girders.

[0010] Preferably, the RTK positioning system is composed of a GPS base station, a GPS mobile station data-connected to the GPS base station, a vibrating rod measurement and control unit data-connected to the GPS mobile station, and a vibrating operation unit data-connected to the vibrating plate measurement and control unit.

[0011] Preferably, the GPS reference station installation includes the following steps:

[0012] Step 1: Set up the base station and antenna, keeping the distance between the two tripods no less than m to avoid the radio station interfering with the GPS signal.

[0013] Step 2: Install the satellite receiver and radio antenna. Install the fixed base station satellite receiver and radio antenna on the base station and antenna support respectively.

[0014] Step 3: Install the digital radio. Install the fixed base station digital radio on the antenna tripod. The three serial ports on the digital radio are connected to the radio antenna, power supply, and satellite receiver respectively.

[0015] Step 4: Turn on the digital radio and check the power of the digital radio to ensure that the base station is set up successfully and is transmitting differential data to the mobile station receiver normally.

[0016] The GPS mobile station installation includes the following steps:

[0017] Step 1: Tighten the centering rod and GPS antenna, and connect the GPS antenna to the mobile station satellite receiver using the GPS antenna cable.

[0018] Step 2: Start the receiver and use the receiver antenna to receive the differential data sent by the base station. Check the signal light to ensure that the receiver is receiving the differential data normally.

[0019] Step 3: Use the handheld to set the receiver data output format to GPGGA format and the data positioning time interval to seconds.

[0020] The vibrator measurement and control unit includes the following installation steps:

[0021] Step 1: Install the embedded GPS antenna cross handle sleeve on the end of the vibrating rod operating rod, and tighten the welding screws on one end of the centering rod and the sleeve.

[0022] Step 2: Fix the special electrode device near the head of the vibrating rod and connect the other end of the electrode power cord to the microcontroller.

[0023] The vibration unit's operating process involves activating the vibrating rod and performing the vibration operation. Specifically, during the vibration operation, the GPS antenna should be kept vertical as much as possible to ensure a high-precision fixed solution. The active layer data in the vibration display analysis and calculation software should be checked for real-time refreshes. The on-site construction personnel should be communicated and instructed via intercom to collect data.

[0024] Preferably, the ultrasonic concrete vibration density monitoring system is composed of a controller, an ultrasonic transmitting end of an ultrasonic detector electrically connected to the controller, and an ultrasonic receiving end of the ultrasonic detector.

[0025] Preferably, the auxiliary vibration verification mechanism includes a cast-in-place beam box, a rectangular fixed oil tank is fixedly installed on the upper surface of the cast-in-place beam box, hydraulic oil is provided inside the fixed oil tank, a reducer is fixedly installed on the surface of the fixed oil tank, a drive motor for driving the hydraulic oil inside the fixed oil tank is fixedly installed on the surface of the reducer, and the drive motor is electrically connected to the controller through a cable.

[0026] Preferably, the output shaft of the driving motor is fixedly connected to the power input end of the reducer, and the power output end of the reducer is fixedly connected to a driving screw.

[0027] One end of the driving screw rod penetrates and extends to the inner wall of the fixed oil tank, and one end of the driving screw rod is rotatably connected to the inner wall of the fixed oil tank through a bearing.

[0028] The inner wall of the fixed oil tank is fixedly connected with four symmetrically distributed guide positioning rods, the inner wall of the fixed oil tank is slidably connected with a pressurizing piston, and the surface of the pressurizing piston is threadedly connected with the surface of the driving screw.

[0029] Preferably, four guide holes adapted to the guide positioning rod are opened on the surface of the pressurizing piston, and the inner walls of the guide holes are slidably connected to the surface of the guide positioning rod.

[0030] A symmetrically distributed pressurized transverse pipe and a pressure-releasing transverse pipe are fixedly installed on the surface of the cast-in-place beam box. The two pressurized transverse pipes and the two pressure-releasing transverse pipes are symmetrically distributed with the axis of the cast-in-place beam box as the center.

[0031] Preferably, the surface of the pressurizing transverse pipe is fixedly connected to a pressurizing pipe fixedly connected to the inner wall of one end of the fixed oil tank, and the surface of the pressure relief transverse pipe is fixedly connected to a pressure relief pipe fixedly connected to the inner wall of the other end of the fixed oil tank.

[0032] A plurality of verification tubes for assisting vibration are fixedly installed on the surface of the cast-in-place beam box. The plurality of verification tubes are symmetrically distributed with the axis of the cast-in-place beam box as the center. One end of the verification tube passes through and extends to the inner wall of the cast-in-place beam box.

[0033] Preferably, the other end and the surface of the verification tube are fixedly connected to an oil inlet pipe and an oil return pipe respectively, and one end of the oil inlet pipe is fixedly connected to the inner wall of the pressurized cross pipe.

[0034] A solenoid valve electrically connected to the controller via a cable is fixedly mounted on the surface of the oil inlet pipe, and one end of the oil return pipe is fixedly connected to the inner wall of the pressure relief transverse pipe.

[0035] Preferably, the inner wall of the verification tube is fixedly connected with a fixed sealing ring, the inner wall of the fixed sealing ring is slidably connected with a piston rod, one end of the piston rod is fixedly connected with a vibration verification column, and one end of the vibration verification column extends to the surface of the verification tube.

[0036] The other end of the piston rod is fixedly connected to a pressure-bearing piston that is slidably connected to the inner wall of the verification tube. A return spring is sleeved on the surface of the piston rod. The two ends of the return spring are respectively fixedly connected to the fixed sealing ring and the surface of the pressure-bearing piston.

[0037] A hydraulic oil chamber is provided between the upper surface of the pressure-bearing piston and the inner wall of the verification tube, and the inner wall of the oil inlet pipe is fixedly connected to the inner wall of the hydraulic oil chamber.

[0038] A reset cavity is provided between the lower surface of the pressure-bearing piston and the inner wall of the verification tube, and the inner wall of the oil return tube is fixedly connected to the inner wall of the reset cavity.

[0039] An oil pressure sensor is fixedly mounted on the inner wall of the hydraulic oil chamber, and the oil pressure sensor is electrically connected to the controller via a cable.

[0040] The beneficial effects of the present invention are:

[0041] 1. By setting up an RTK positioning system, combining the construction characteristics of oblique and straight insertion of the vibrator, as well as the requirements for the spacing between insertion points and the spacing between insertion points and the template, and installing an RTK positioning device on the vibrating rod, real-time positioning of the insertion point can be achieved.

[0042] 2. By setting up an ultrasonic concrete vibration density monitoring system, based on the pouring characteristics of concrete components, ultrasonic transmitting and receiving devices are established to achieve real-time control of concrete vibration density through vibration waveform judgment.

[0043] 3. By setting up a data acquisition terminal and adopting a construction control strategy based on intelligent concrete vibration positioning and density monitoring technology, the density monitoring data of each insertion point is aggregated to the cloud platform in real time using Internet technology, and the construction parameters such as the insertion depth and vibration frequency of the vibrating rod are dynamically adjusted to form a concrete intelligent vibration construction control strategy. The concrete density monitoring data is verified by an auxiliary vibration verification mechanism, thus solving the problem that the quality of existing concrete vibration is usually judged by on-site construction personnel based on practical experience, resulting in missed vibration, insufficient vibration, and over-vibration, which affects the safety of the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of an intelligent system for real-time monitoring of the vibration quality of cast-in-situ box girders proposed by the present invention;

[0045] Figure 2 A three-dimensional diagram of the cast-in-situ box beam structure of an intelligent system for real-time monitoring of the vibration quality of cast-in-situ box beams proposed by the present invention;

[0046] Figure 3 This is a front view of the cast-in-situ box beam structure of an intelligent system for real-time monitoring of the vibration quality of cast-in-situ box beams proposed by the present invention;

[0047] Figure 4 A three-dimensional diagram of the fixed oil tank structure of the intelligent system for real-time monitoring of the vibration quality of cast-in-situ box beams proposed by the present invention;

[0048] Figure 5 This is a three-dimensional diagram of the reducer structure of the intelligent system for real-time monitoring of the vibration quality of cast-in-situ box beams proposed by the present invention;

[0049] Figure 6 This is a three-dimensional diagram of the verification tube structure of the intelligent system for real-time monitoring of the vibration quality of cast-in-situ box beams proposed by the present invention;

[0050] Figure 7 A three-dimensional diagram of the vibration verification column structure of the intelligent system for real-time monitoring of the vibration quality of cast-in-situ box girders proposed by the present invention;

[0051] Figure 8 This is a schematic diagram of the RTK positioning system structure of an intelligent system for real-time monitoring of the vibration quality of cast-in-situ box beams proposed by the present invention;

[0052] Figure 9 This is a schematic diagram of the current transformer in the RTK positioning system structure of an intelligent system for real-time monitoring of the vibration quality of cast-in-situ box beams proposed by the present invention;

[0053] Figure 10 This is a structural ultrasonic detection model diagram of an ultrasonic concrete vibration density monitoring system for a real-time monitoring intelligent system for the vibration quality of cast-in-situ box beams proposed by the present invention;

[0054] Figure 11 This is a schematic diagram of concrete changes during the vibration process of the RTK positioning system of the intelligent system for real-time monitoring of the vibration quality of cast-in-place box girders proposed by the present invention.

[0055] Figure 1: Data acquisition terminal; 2: Intelligent gateway; 3: Cloud platform; 4: Web application; 5: RTK positioning system; 6: Ultrasonic concrete vibration density monitoring system; 601: Controller; 602: Ultrasonic transmitter; 603: Ultrasonic receiver; 7: Auxiliary vibration verification mechanism; 701: Cast-in-place beam box; 702: Fixed oil tank; 703: Reducer; 704: Drive motor; 705: Drive screw; 706: Guide rod ;707, pressurizing piston;708, guide hole;709, pressurizing cross pipe;710, pressure relief cross pipe;711, pressurizing pipe;712, pressure relief pipe;713, verification pipe;714, oil inlet pipe;715, oil return pipe;716, solenoid valve;717, fixed sealing ring;718, piston rod;719, vibration verification column;720, pressure-bearing piston;721, reset spring;722, hydraulic oil chamber;723, reset chamber;724, oil pressure sensor. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0057] Reference Figures 1-11 , an intelligent system for real-time monitoring of the vibration quality of cast-in-place box beams, including a data acquisition terminal 1, the data acquisition terminal 1 is connected to an intelligent gateway 2, the intelligent gateway 2 is connected to a cloud platform 3, and the cloud platform 3 is connected to a Web application 4.

[0058] Specifically, the intelligent gateway 2 uses the Modbus protocol to communicate with the data acquisition terminal device and the MQTT protocol to upload the data to the cloud platform 3; the cloud platform 3 is built by Alibaba Cloud server and cloud database, and the back-end uses the Express framework to design the Web application 4, and the front-end uses AdminLTE, Ajax and Echarts technologies to design the human-computer interaction interface to achieve real-time monitoring and feedback of the vibration quality during construction.

[0059] The data acquisition terminal 1 includes an RTK positioning system 5 for vibration positioning, an ultrasonic concrete vibration density monitoring system 6 for concrete vibration quality detection, and an auxiliary vibration verification mechanism 7.

[0060] Among them, the RTK positioning system 5 is used to locate and detect the position of the vibrating rod used for vibrating the cast-in-place box girder concrete.

[0061] The RTK positioning system 5 is composed of a GPS base station, a GPS mobile station connected to the GPS base station data, a vibrating rod measurement and control unit connected to the GPS mobile station data, and a vibrating operation unit connected to the vibrating plate measurement and control unit data.

[0062] The establishment of a GPS base station includes the following steps:

[0063] Step 1: Set up the base station and antenna, keeping the distance between the two tripods at least 3m to avoid interference with the GPS signal.

[0064] Furthermore, the GPS base station needs to be set up in a place with high terrain and wide vision to avoid strong magnetic fields, so as to facilitate UHF (Ultra High Frequency) wireless signal transmission and satellite signal reception.

[0065] Step 2: Install the satellite receiver and radio antenna. Install the fixed base station satellite receiver and radio antenna on the base station and antenna support respectively.

[0066] Furthermore, if the mobile station is far away, you can use an extension pole for the radio antenna. Use the receiver to start satellite reception until the satellite light flashes N times at an interval of 5 seconds, indicating that N satellites are received.

[0067] Step 3: Install the digital radio. Install the fixed base station digital radio on the antenna tripod. The three serial ports on the digital radio are connected to the radio antenna, power supply, and satellite receiver respectively.

[0068] Furthermore, the radio is connected to the receiver via a radio data transmission line, and is connected to the power supply via a radio power line.

[0069] Step 4: Turn on the digital radio and check the power of the digital radio to ensure that the base station is set up successfully and is transmitting differential data to the mobile station receiver normally.

[0070] Furthermore, the data transmission distance of digital radio should not be less than 5km.

[0071] The installation of a GPS mobile station includes the following steps:

[0072] Step 1: Tighten the centering rod and GPS antenna, and connect the GPS antenna to the mobile station satellite receiver using the GPS antenna cable.

[0073] Step 2: Start the receiver and use the receiver antenna to receive the differential data sent by the base station. Check the signal light to ensure that the receiver is receiving the differential data normally.

[0074] Step 3: Use the handheld to set the receiver data output format to GPGGA (GPS fixed data output sentence) format and the data positioning time interval to 1 second.

[0075] The vibrator measurement and control unit includes the following installation steps:

[0076] Step 1: Install the embedded GPS antenna cross handle sleeve on the end of the vibrating rod operating rod, and tighten the welding screws on one end of the centering rod and the sleeve.

[0077] Step 2: Fix the special electrode device near the head of the vibrating rod and connect the other end of the electrode power cord to the microcontroller.

[0078] The vibration unit's operating process involves turning on the vibrating rod and performing the vibration operation. Specifically, during the vibration operation, the GPS antenna should be kept vertical as much as possible to ensure a high-precision fixed solution. The active layer data in the vibration display analysis and calculation software should be checked for real-time refresh. The on-site construction personnel should be communicated and instructed via intercom to collect data.

[0079] In order to realize real-time positioning monitoring of vibration, RTK (real-time kinematic) is used to track the vibrating rod in real time. It is based on GNSS (global navigation satellite system) positioning technology. The working principle is as follows: Figure 8 shown.

[0080] First, the GPS mobile station receives real-time positioning data from the antenna fixed on the vibrator and the base station, and solves and processes the data to obtain the high-precision positioning trajectory coordinates of the vibrator head (accuracy reaches cm level), and obtains the required data of the insertion point spacing and distance from the template under different construction characteristics of the internal vibrator being inserted obliquely or at an angle.

[0081] Furthermore, based on the difference in potential between the residual concrete slurry on the vibrating rod when it is inserted and removed from the vibrating mixture, a specialized electrode device is used to collect and transmit electrical signals and calculate the insertion and removal interval to determine the vibration time. Secondly, wireless radio frequency (RF) is used to continuously receive real-time data on the vibrating rod's head position, including the 3D coordinates and vibration status. This data is then transmitted in real-time via a radio station to a remote cloud platform 3 database in a data packet format for further integrated feedback.

[0082] Vibration duration refers to the time it takes for a vibrator to be inserted and removed. Vibration time is an essential process evaluation parameter, and the data collection device consists of a current transformer and a conversion circuit installed on the vibrator motor.

[0083] The current transformer converts and measures the current based on the electromagnetic principle. Figure 9The device uses a through-type current transformer (model DL-CT08CL5) with a primary winding directly mounted on the vibrator motor power cable. The secondary winding has 2000 turns, and the output secondary current is converted to the desired voltage. When the vibrator is inserted into the concrete, the primary current changes due to increased power consumption, which in turn causes changes in the secondary current and the converted voltage. The microcontroller uses this change in converted voltage to determine whether the vibrator is inserted or removed from the concrete.

[0084] Furthermore, fresh concrete is a Bingham fluid. When the shear stress exceeds the static yield stress of concrete, the concrete begins to flow, accompanied by the sinking of aggregate and the floating of internal bubbles. The theoretical calculation formula for shear force under ramming is shown below:

[0085] T W =T0+μY W

[0086] Where: T W is the shear force provided by the vibrator, Pa; is the yield stress of concrete, Pa; μ is the plastic viscosity of concrete, mPa·s; is the vibration shear strain rate, 1 / s.

[0087] The shear force is provided by the exciting force generated by the vibrator, which reflects the amount of power provided by the vibrator for the forced vibration of the particles in the concrete. The exciting force depends only on the structure of the vibrator. The greater the mass and eccentricity of the vibrator, the greater the amplitude, exciting force and shear force. It can be seen from the above formula that within the effective range of vibration, the shear force exceeds the yield stress, the fluidity of the concrete is enhanced, the aggregate sinks, and the contained bubbles float up or are crushed and discharged, so that the slurry is filled more fully, and the purpose of dense concrete is achieved. Outside the effective range, due to energy attenuation, the shear force is less than the yield stress, the aggregate will not settle only under the action of gravity, and the bubbles will not float only under the action of buoyancy. The mixture still exhibits solid properties, and the concrete cannot be dense. Figure 11 shown.

[0088] By setting up the RTK positioning system 5, combining the construction characteristics of oblique and straight insertion of the vibrator, as well as the requirements for the spacing between insertion points and the spacing between insertion points and templates, and installing an RTK positioning device on the vibrating rod, real-time positioning of the insertion point can be achieved.

[0089] The ultrasonic concrete vibration density monitoring system 6 is used to monitor the vibration density of the cast-in-place box girder concrete in real time.

[0090] The ultrasonic concrete vibration density monitoring system 6 is composed of a controller 601 , an ultrasonic transmitting end 602 of an ultrasonic detector electrically connected to the controller 601 , and an ultrasonic receiving end 603 of the ultrasonic detector.

[0091] To achieve real-time monitoring of the concrete vibrated density of cast-in-place box girders, this embodiment employs ultrasonic testing technology. When the detector emits an electrical signal, an ultrasonic wave is emitted. This wave passes through an acrylic wedge, enters the test sample, and is scattered by defects. After propagating again within the sample and wedge, it is converted from mechanical vibration into an electrical signal by the same probe and recorded as a waveform. Based on the concrete component's casting characteristics, an ultrasonic transmitter 602 and receiver are established, and the vibration waveform is used to determine and control the concrete vibrated density in real time.

[0092] The measurement system can be expressed as a linear time-invariant model as follows.

[0093] v0(t)=b(t) * m(t) * p in (t) * c in (t) * r in (t) * a(t) * r sc (t) * p sc (t)

[0094] Where V0(t) represents the received waveform, * represents the time series composite, and each of b(t), m(t), p(t), c(t), r(t), and a(t) is a measurement device. When propagating in a wedge and inside a solid, the ultrasonic pulse-echo method model is based on the ultrasonic pulse-echo method to analyze the sound attenuation, propagation distance, ultrasonic beam diffraction, and plane wave propagation at the wedge / solid interface. In represents the incident wave propagation process, and sc represents the scattered wave propagation process.

[0095] Perform Fourier transform on the above formula to get:

[0096] v0(t)=B(ω) * M(ω) * P in (ω) * C in (ω) * R in (ω) * A(ω) * ×R sc (ω) * C sc (ω) * P sc (ω)

[0097] Where ω is the angular frequency, and the uppercase function is the frequency domain response function corresponding to the lowercase function. The attenuation of M(ω) and the influence of the measurement setup on B(ω) were experimentally examined. For Pin(ω) to Psc(ω), which are related to scattered wave propagation, initial and boundary conditions were used to solve the wave equation as an initial value boundary problem, which can be formulated and evaluated based on elastic wave theory.

[0098] Except for special cases, the internal defects of the material have arbitrary shapes, and it is not easy to solve the closed-form boundary value problem with the initial value. The simulation of ultrasonic waves is usually calculated by numerical calculation.

[0099] By setting up an ultrasonic concrete vibration density monitoring system 6, based on the pouring characteristics of concrete components, ultrasonic transmitting and receiving devices are established to achieve real-time control of concrete vibration density through vibration waveform judgment.

[0100] Among them, the auxiliary vibration verification mechanism 7 is used to assist in concrete vibration and density monitoring and verification of the cast-in-place box girder.

[0101] The auxiliary vibration verification mechanism 7 includes a cast-in-place beam box 701, and a rectangular fixed oil tank 702 is fixedly installed on the upper surface of the cast-in-place beam box 701. Hydraulic oil is provided inside the fixed oil tank 702. A reducer 703 is fixedly installed on the surface of the fixed oil tank 702. A drive motor 704 for driving the hydraulic oil inside the fixed oil tank 702 is fixedly installed on the surface of the reducer 703. The drive motor 704 is electrically connected to the controller 601 through a cable.

[0102] The output shaft of the driving motor 704 is fixedly connected to the power input end of the speed reducer 703 , and the power output end of the speed reducer 703 is fixedly connected to the driving screw 705 .

[0103] One end of the driving screw rod 705 passes through and extends to the inner wall of the fixed oil tank 702 , and one end of the driving screw rod 705 is rotatably connected to the inner wall of the fixed oil tank 702 via a bearing.

[0104] Four symmetrically distributed guide positioning rods 706 are fixedly connected to the inner wall of the fixed oil tank 702 , and a pressurizing piston 707 is slidably connected to the inner wall of the fixed oil tank 702 . The surface of the pressurizing piston 707 is threadedly connected to the surface of the driving screw 705 .

[0105] Four guide holes 708 that match the guide positioning rod 706 are formed on the surface of the pressurizing piston 707 , and the inner walls of the guide holes 708 are slidably connected to the surface of the guide positioning rod 706 .

[0106] A symmetrically distributed pressurized transverse pipe 709 and a pressure relief transverse pipe 710 are fixedly installed on the surface of the cast-in-place beam box 701. The two pressurized transverse pipes 709 and the two pressure relief transverse pipes 710 are symmetrically distributed with the axis of the cast-in-place beam box 701 as the center.

[0107] The surface of the pressure transverse pipe 709 is fixedly connected to the inner wall of one end of the fixed oil tank 702 with a pressure pipe 711 , and the surface of the pressure relief transverse pipe 710 is fixedly connected to the inner wall of the other end of the fixed oil tank 702 with a pressure relief pipe 712 .

[0108] A plurality of verification tubes 713 for auxiliary vibration are fixedly installed on the surface of the cast-in-place beam box 701. The plurality of verification tubes 713 are symmetrically distributed with the axis of the cast-in-place beam box 701 as the center. One end of the verification tube 713 passes through and extends to the inner wall of the cast-in-place beam box 701.

[0109] The other end and the surface of the verification tube 713 are fixedly connected to an oil inlet pipe 714 and an oil return pipe 715 respectively. One end of the oil inlet pipe 714 is fixedly connected to the inner wall of the pressurized cross pipe 709.

[0110] A solenoid valve 716 electrically connected to the controller 601 via a cable is fixedly mounted on the surface of the oil inlet pipe 714 , and one end of the oil return pipe 715 is fixedly connected to the inner wall of the pressure relief transverse pipe 710 .

[0111] Furthermore, the solenoid valve 716 is a normally open solenoid valve 716 .

[0112] The inner wall of the verification tube 713 is fixedly connected to a fixed sealing ring 717, and the inner wall of the fixed sealing ring 717 is slidably connected to a piston rod 718. One end of the piston rod 718 is fixedly connected to a vibration verification column 719, and one end of the vibration verification column 719 extends to the surface of the verification tube 713.

[0113] When in use, the verification tube 713 is sealed by vibrating the verification column 719 to prevent the concrete inside the cast-in-place beam box 701 from entering the verification tube 713.

[0114] The other end of the piston rod 718 is fixedly connected to a pressure-bearing piston 720 that is slidably connected to the inner wall of the verification tube 713. A return spring 721 is sleeved on the surface of the piston rod 718. The two ends of the return spring 721 are respectively fixedly connected to the surface of the fixed sealing ring 717 and the pressure-bearing piston 720.

[0115] A hydraulic oil chamber 722 is provided between the upper surface of the pressure-bearing piston 720 and the inner wall of the verification tube 713 , and the inner wall of the oil inlet pipe 714 is fixedly connected to the inner wall of the hydraulic oil chamber 722 .

[0116] A reset cavity 723 is provided between the lower surface of the pressure-bearing piston 720 and the inner wall of the verification tube 713 , and the inner wall of the oil return tube 715 is fixedly connected to the inner wall of the reset cavity 723 .

[0117] An oil pressure sensor 724 is fixedly mounted on the inner wall of the hydraulic oil chamber 722 , and the oil pressure sensor 724 is electrically connected to the controller 601 via a cable.

[0118] Specifically, the working principle of the auxiliary vibration verification mechanism 7 in this embodiment is that when the cast-in-place box beam is vibrated, the driving motor 704 is automatically controlled by the controller 601 to work, and the driving motor 704 drives the driving screw 705 to rotate the pressurizing piston 707 through the reducer 703. The pressurizing piston 707 moves inside the fixed oil tank 702, squeezing and pushing the hydraulic oil inside the fixed oil tank 702 through the pressurizing pipe 711 into the pressurizing cross pipe 709, and the hydraulic oil inside the pressurizing cross pipe 709 enters the oil inlet pipe 714, and enters the verification pipe 713 through the oil inlet pipe 714, squeezing and pushing the pressure-bearing piston 720 in the verification pipe 713. The pressure-bearing piston 720 is squeezed and pushed by the hydraulic oil, driving the piston rod 718 and the vibration verification column 719 to extend out of the verification pipe 713, enter the cast-in-place beam box 701 to contact the concrete, and tamp the concrete.

[0119] After the hydraulic oil pressure data is fed back to the controller 601 and the cloud platform 3, the controller 601 controls the driving motor 704 to reverse, and the driving motor 704 drives the pressurizing piston 707 to move in the opposite direction through the reducer 703, driving the pressurizing piston 707 to squeeze the hydraulic oil inside the fixed oil tank 702 into the pressure relief pipe 712, and then enter the pressure relief cross pipe 710 through the pressure relief pipe 712, and then enter the verification pipe 713 through the return oil pipe 715, pushing the pressure-bearing piston 720, the piston rod 718 and the vibration verification column 719 to reset.

[0120] The vibration verification column 719 is pushed repeatedly into the cast-in-place beam box 701 by hydraulic oil squeezing to tamp the concrete, thereby assisting in vibrating and compacting the concrete inside the cast-in-place beam box 701.

[0121] Finally, when monitoring the vibration density, the hydraulic oil is controlled by the solenoid valve 716 to enter the verification tube 713 in turn, squeezing and pushing the pressure-bearing piston 720 in the verification tube 713. The pressure-bearing piston 720 is squeezed and pushed by the hydraulic oil, driving the piston rod 718 and the vibration verification column 719 to extend out of the verification tube 713, enter the cast-in-place beam box 701 to contact the concrete, and tamp the concrete. Then, the oil pressure sensor 724 monitors the hydraulic oil pressure inside the hydraulic oil chamber 722 when the vibration verification column 719 enters the concrete to tamp, and feeds back the pressure to the controller 601 in real time. The controller 601 feeds back the pressure to the cloud platform 3 through the intelligent gateway 2, and cooperates with the RTK positioning system 5 and the ultrasonic concrete vibration density monitoring system 6 to monitor and verify the density of the concrete in the cast-in-place beam box 701 in real time.

[0122] By setting up a data acquisition terminal 1, based on the construction control strategy of intelligent positioning and density monitoring technology of concrete vibration, the Internet technology is used to aggregate the density monitoring data of each insertion point to the cloud platform in real time, and dynamically adjust the construction parameters such as the insertion depth of the vibrating rod and the vibration frequency to form a concrete intelligent vibration construction control strategy. The concrete density monitoring data is verified by the auxiliary vibration verification mechanism 7, thereby solving the problem that the existing concrete vibration quality is usually judged by on-site construction personnel based on practical experience, resulting in missed vibration, insufficient vibration, and over-vibration, which affects the safety of the bridge.

[0123] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An intelligent system for real-time monitoring of the vibration quality of cast-in-situ box beams, comprising a data acquisition terminal (1), characterized in that: The data acquisition terminal (1) is data-connected to an intelligent gateway (2), the intelligent gateway (2) is data-connected to a cloud platform (3), and the cloud platform (3) is data-connected to a Web application (4); the data acquisition terminal (1) comprises an RTK positioning system (5) for vibrating positioning, an ultrasonic concrete vibration density monitoring system (6) for concrete vibration quality detection, and an auxiliary vibration verification mechanism (7); wherein the RTK positioning system (5) is used to perform positioning detection on the position of a vibrating rod for vibrating cast-in-place box girder concrete; wherein the ultrasonic concrete vibration density monitoring system (6) is used to perform real-time monitoring on the vibration density of cast-in-place box girder concrete; wherein the auxiliary vibration verification mechanism (7) is used to perform concrete vibration assistance and density monitoring verification on the cast-in-place box girder; The auxiliary vibration verification mechanism (7) comprises a cast-in-place beam box (701), a rectangular fixed oil tank (702) is fixedly mounted on the upper surface of the cast-in-place beam box (701), hydraulic oil is provided inside the fixed oil tank (702), a reducer (703) is fixedly mounted on the surface of the fixed oil tank (702), a drive motor (704) for driving the hydraulic oil inside the fixed oil tank (702) is fixedly mounted on the surface of the reducer (703), and the drive motor (704) is electrically connected to the controller (601) via a cable; The output shaft of the driving motor (704) is fixedly connected to the power input end of the reducer (703), and the power output end of the reducer (703) is fixedly connected to a driving screw (705); one end of the driving screw (705) penetrates and extends to the inner wall of the fixed oil tank (702), and one end of the driving screw (705) is rotatably connected to the inner wall of the fixed oil tank (702) via a bearing; Four symmetrically distributed guide positioning rods (706) are fixedly connected to the inner wall of the fixed oil tank (702), a pressurizing piston (707) is slidably connected to the inner wall of the fixed oil tank (702), and the surface of the pressurizing piston (707) is threadedly connected to the surface of the driving screw (705); A symmetrically distributed pressurizing transverse pipe (709) and a pressure relief transverse pipe (710) are fixedly mounted on the surface of the cast-in-place beam box (701), and the two pressurizing transverse pipes (709) and the two pressure relief transverse pipes (710) are symmetrically distributed with the axis of the cast-in-place beam box (701) as the center. The surface of the pressurizing transverse pipe (709) is fixedly connected to a pressurizing pipe (711) fixedly connected to the inner wall of one end of the fixed oil tank (702), and the surface of the pressure relief transverse pipe (710) is fixedly connected to a pressure relief pipe (712) fixedly connected to the inner wall of the other end of the fixed oil tank (702); A plurality of verification tubes (713) for assisting vibration are fixedly mounted on the surface of the cast-in-place beam box (701), the plurality of verification tubes (713) being symmetrically distributed around the axis of the cast-in-place beam box (701), and one end of the verification tube (713) passes through and extends to the inner wall of the cast-in-place beam box (701); The inner wall of the verification tube (713) is fixedly connected to a fixed sealing ring (717), the inner wall of the fixed sealing ring (717) is slidably connected to a piston rod (718), one end of the piston rod (718) is fixedly connected to a vibration verification column (719), and one end of the vibration verification column (719) extends to the surface of the verification tube (713); The other end of the piston rod (718) is fixedly connected to a pressure-bearing piston (720) that is slidably connected to the inner wall of the verification tube (713), and the surface of the piston rod (718) is sleeved with a return spring (721), and the two ends of the return spring (721) are fixedly connected to the surface of the fixed sealing ring (717) and the pressure-bearing piston (720), respectively.

2. The intelligent system for real-time monitoring of the vibration quality of cast-in-situ box beams according to claim 1 is characterized in that: The RTK positioning system (5) is composed of a GPS base station, a GPS mobile station data-connected to the GPS base station, a vibrating rod measurement and control unit data-connected to the GPS mobile station, and a vibrating operation unit data-connected to the vibrating rod measurement and control unit.

3. The intelligent system for real-time monitoring of the vibration quality of cast-in-situ box beams according to claim 2, characterized in that: The GPS reference station installation includes the following steps: Step 1: Set up the base station and antenna, keeping the distance between the two tripods at least 3m to avoid interference with the GPS signal; Step 2: Install the satellite receiver and radio antenna. Install the fixed base station satellite receiver and radio antenna on the base station and antenna support respectively. Step 3: Install the digital radio. Install the fixed base station digital radio on the antenna tripod. Connect the three serial ports on the digital radio to the radio antenna, power supply, and satellite receiver respectively. Step 4: Turn on the digital radio and check the power supply of the digital radio to ensure that the base station is set up successfully and is transmitting differential data to the rover receiver normally; The GPS mobile station installation includes the following steps: Step 1: Tighten the centering rod and GPS antenna, and connect the GPS antenna to the mobile station satellite receiver using the GPS antenna cable; Step 2: Start the receiver and use the receiver antenna to receive the differential data sent by the base station. Check the signal light to ensure that the receiver is receiving the differential data normally. Step 3: Use the handheld to set the receiver data output format to GPGGA format and the data positioning interval to 1 second; The vibrator measurement and control unit includes the following installation steps: Step 1: Install the GPS antenna cross handle sleeve on the end of the vibrating rod, and tighten the welding screws on the sleeve to fix the centering rod; Step 2: Fix the special electrode device near the head of the vibrating rod and connect the other end of the electrode power line to the microcontroller; The operation process of the vibration operation unit is to turn on the vibrating rod and perform the vibration operation; specifically, during the vibration operation, the GPS antenna should be kept vertical as much as possible to ensure a high-precision fixed solution; check whether the active layer data in the vibration display analysis and calculation software is refreshed in real time, and communicate and guide with the on-site construction personnel through the walkie-talkie to collect data.

4. The intelligent system for real-time monitoring of the vibration quality of cast-in-situ box beams according to claim 1 is characterized in that: The ultrasonic concrete vibration density monitoring system (6) is composed of a controller (601), an ultrasonic transmitting end (602) of an ultrasonic detector electrically connected to the controller (601), and an ultrasonic receiving end (603) of the ultrasonic detector.

5. The intelligent system for real-time monitoring of the vibration quality of cast-in-situ box beams according to claim 4 is characterized in that: Four guide holes (708) adapted to the guide positioning rod (706) are provided on the surface of the pressurizing piston (707), and the inner walls of the guide holes (708) are slidably connected to the surface of the guide positioning rod (706).

6. The intelligent system for real-time monitoring of the vibration quality of cast-in-situ box beams according to claim 5, characterized in that: The other end and the surface of the verification tube (713) are fixedly connected to an oil inlet pipe (714) and an oil return pipe (715), respectively. One end of the oil inlet pipe (714) is fixedly connected to the inner wall of the pressurized transverse pipe (709). A solenoid valve (716) electrically connected to the controller (601) via a cable is fixedly mounted on the surface of the oil inlet pipe (714), and one end of the oil return pipe (715) is fixedly connected to the inner wall of the pressure relief transverse pipe (710).

7. The intelligent system for real-time monitoring of the vibration quality of cast-in-situ box beams according to claim 6, characterized in that: A hydraulic oil chamber (722) is provided between the upper surface of the pressure-bearing piston (720) and the inner wall of the verification tube (713), and the inner wall of the oil inlet pipe (714) is fixedly connected to the inner wall of the hydraulic oil chamber (722); A reset cavity (723) is provided between the lower surface of the pressure-bearing piston (720) and the inner wall of the verification tube (713), and the inner wall of the oil return tube (715) is fixedly connected to the inner wall of the reset cavity (723); An oil pressure sensor (724) is fixedly mounted on the inner wall of the hydraulic oil chamber (722), and the oil pressure sensor (724) is electrically connected to the controller (601) via a cable.

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