CN216049684U - Displacement measuring device for jacking bridge - Google Patents

Abstract

The utility model discloses a displacement measuring device for jacking a bridge, which comprises the steps of preliminary preparation work, mounting of displacement measuring instruments, jacking operation, support removal, support replacement, descending to an appointed position and the like, wherein in the step of mounting of the displacement measuring instruments, a plurality of displacement measuring instruments are arranged below or on the side surface of the bridge to be jacked in a measuring mode to obtain the current data of the bridge to be jacked, all the displacement measuring instruments and a smart base station on a construction site are connected into the same network system, the displacement measuring instruments upload the collected data to a data management system through the smart base station through a 5G micro base station for calculation processing, and relevant data are output to support the jacking operation of the bridge. The remarkable effects are as follows: the bridge jacking work is combined with the 5G network, so that the signal delay is effectively reduced, the bridge jacking speed is increased, and the construction period is shortened; the time delay of data is effectively reduced, and the displacement change of the bridge can be timely known in the bridge jacking process.

Description

Displacement measuring device for jacking bridge

Technical Field

The utility model relates to the technical field of engineering construction information, in particular to a displacement measuring device for jacking a bridge.

Background

From more than a decade ago, China vigorously develops infrastructure construction and builds a lot of roads and bridges. In the long-time use process, the actual load of a road bridge is far greater than the originally expected standard load, so that the lower support of the bridge is rapidly aged, engineering diseases such as support shear deformation failure, bridge displacement and the like occur, and a series of safety problems are brought. At this point, the lower support needs to be replaced by jacking the bridge.

Before replacing the lower support, the bridge needs to be lifted, then the lower support needs to be replaced, and then the bridge needs to be put back to the original position. When a support is replaced, the stress state of a beam body needs to be maintained basically unchanged, a single-span bridge is provided with a left beam end and a right beam end, synchronous jacking needs to be realized by using a data processing system of computer software, and the tolerance error of the jacking process is very small and is often several millimeters. Therefore, monitoring and feedback equipment needs to be arranged on the bridge, data signals are transmitted to a data processing system, and whether the jacking of the bridge is coordinated or not is monitored.

The existing bridge jacking work has the technical defects that: firstly, in order to reduce the delay risk of data transmission, the speed of jacking the bridge is adjusted to be very slow, for an urban bridge, the work of jacking, replacing a support and lowering the support back to the original position generally needs to be finished at night, the construction period is very short, and the engineering accident is caused by pursuing the speed in order to complete a task on schedule; secondly, displacement is generally monitored only at the bridge end in the prior art, and displacement of other positions such as the bridge span is not monitored; thirdly, the jacking command center in the prior art is generally far away from the site, the bridge is also long, and the data transmission risks; fourthly, in the traditional method, a very long-distance entity signal transmission line needs to be prepared, so that the interference of other on-site electrical equipment is easily caused, or the deformation such as rolling by vehicles is failed, or manual errors exist during connection, so that the signal distortion is caused, and the bridge jacking state cannot be accurately monitored.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model aims to provide a displacement measuring device for bridge jacking, which combines data transmission and a 5G network in the bridge jacking process and erects a exquisite base station and a wireless infrared displacement measuring system on a construction site so as to effectively overcome various defects in the prior art.

In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:

the utility model provides a displacement measurement device for bridge jacking which the key lies in: the displacement measuring device comprises a plurality of exquisite base stations arranged along the length direction of the bridge and a plurality of displacement measuring instruments respectively arranged at each preset measuring point, wherein each displacement measuring instrument comprises infrared distance measuring devices and position calibrators which are paired in pairs, and the infrared distance measuring devices are arranged at preset positions and used for simultaneously emitting pulse infrared light and digital pulse signals A; the position calibrator is arranged at the irradiation point of pulse infrared light at the bottom of the bridge and used for sending a digital pulse signal B when receiving the pulse infrared light sent by the infrared distance meter, and the digital pulse signal A and the digital pulse signal B are uploaded to a data management system through a smart base station and a 5G micro base station;

the infrared distance measuring device comprises a first shell, a first power supply, a first control module and a first infrared receiver electrically connected with the first control module are arranged in the first shell, the first infrared receiver is used for receiving pulse infrared light reflected by the position calibrator, a transmission window is further arranged on the first shell right above the first infrared receiver, an infrared transmitter and a first wireless communication module which are electrically connected with the first control module are arranged at the top of the first shell, the infrared transmitter is used for emitting pulse infrared light, and the first control module is in communication interconnection with the exquisite base station through the first wireless communication module;

the position calibrator comprises a second shell, wherein a second power supply, a second control module and a second infrared receiver electrically connected with the second control module are arranged in the second shell, a second wireless communication module electrically connected with the second control module is arranged at the top of the second shell, the second control module is in communication interconnection with the exquisite base station through the second wireless communication module, a window is formed in the top of the second shell, and a reflecting plate is arranged at the bottom of the inner side of the second shell, which is right opposite to the window.

Further, the infrared distance meter sends a digital pulse signal C to the exquisite base station after receiving the pulse infrared light emitted by the position calibrator.

Furthermore, an adhesive fixing layer is fixedly arranged at the bottom of the outer side of the second shell.

Further, a number is provided on a front side surface of the second housing.

The utility model has the following remarkable effects:

firstly, communication between a displacement measuring instrument and a data management system is realized through a smart base station and a 5G micro base station on a construction site, so that displacement measurement in bridge jacking is combined with a 5G network, signal delay is effectively reduced, bridge jacking speed is improved, and construction period is shortened;

secondly, displacement measuring instruments formed by pairwise matched infrared distance measuring devices and position calibrating devices are arranged on the whole bridge to be jacked for displacement monitoring, so that the whole bridge is monitored for displacement in the jacking process, the monitoring accuracy is high, and in addition, the data of the exquisite base station is rapidly transmitted, the time delay of the data is effectively reduced, and the displacement change of the bridge can be timely known in the jacking process of the bridge;

and thirdly, wireless networking communication is carried out between the smart base station and the 5G micro base station, so that the defect that the jacking state of the bridge cannot be accurately monitored due to signal distortion caused by factors such as manual errors and the like caused by the fact that a very long-distance entity signal transmission line needs to be prepared in the traditional method and is easily interfered by other on-site electrical equipment or deformed and invalid due to rolling by vehicles and the like is avoided.

Drawings

FIG. 1 is a system block diagram of the present invention;

FIG. 2 is a schematic view of the displacement measuring device;

FIG. 3 is a schematic diagram of an infrared range finder;

fig. 4 is a schematic structural diagram of the position marker.

Detailed Description

The following provides a more detailed description of the embodiments and the operation of the present invention with reference to the accompanying drawings.

As shown in fig. 1, a displacement measuring device for bridge jacking is characterized in that: the displacement measuring device comprises a plurality of exquisite base stations 60 arranged along the length direction of the bridge 10 and a plurality of displacement measuring instruments 40 respectively arranged at preset measuring points, wherein each displacement measuring instrument 40 comprises an infrared distance measuring device 41 and a position calibrator 42 which are paired in pairs, and the infrared distance measuring devices 41 are arranged at preset positions and used for simultaneously emitting pulse infrared light and a digital pulse signal A; the position calibrator 42 is arranged at the irradiation point of the pulse infrared light at the bottom of the bridge 10, and is used for sending a digital pulse signal B when receiving the pulse infrared light sent by the infrared distance meter 41, and the digital pulse signal a and the digital pulse signal B are both uploaded to the data management system 80 through the smart base station 60 via the 5G micro base station.

When the displacement measuring device is applied to the jacking of the bridge, the method comprises the following steps:

step 1, early preparation:

acquiring the basic condition of a bridge 10 to be jacked in a field investigation mode, measuring the damaged position of a support and the deflection distance of a beam body, determining the jacking height of the bridge 10, drawing up the support of the bridge 10 to be replaced, and finishing the three-way one-level work of a site;

arranging a supporting structure 30 on the pier 20 needing to replace the support, wherein the supporting structure 30 can be a steel column support or a steel hoop in specific implementation, and the supporting structure 30 is formed on the ground at a required position by steel bars, a connecting system, concrete and the like when the steel column support is adopted as temporary support; the steel anchor ear forms a supporting structure 30 on the top of the pier 20 through the anchor ear;

the method comprises the following steps of arranging m exquisite base stations 60 as data nodes according to the length of a bridge 10 to ensure effective acquisition and high-speed feedback of signal data, wherein the exquisite base stations 60 comprise a cabinet, a lithium battery, a 5G AUU, an antenna and the like;

only 5G of low delay can meet the requirement of remote control, a common data cable cannot meet the requirement of jacking a plurality of supports of a bridge at the same time, signals are easily interfered due to overlong line distance, and engineering accidents are easily caused due to untimely stopping because the delay of other remote methods is overhigh. Therefore, in this embodiment, a 5G communication system is adopted for networking.

Selecting a coordinate control point at the site, importing the position information of the coordinate control point into the data management system 80, and setting the origin of coordinates of the site;

step 2, mounting the displacement measuring instrument 40: measuring and installing n displacement measuring instruments 40 below or on the side surface of the bridge 10 to be jacked to obtain the current data of the bridge 10 to be jacked, accessing all the n displacement measuring instruments 40 and m exquisite base stations 60 on a construction site into the same network system, uploading the acquired data to a data management system 80 through the nearby exquisite base stations 60 through a 5G micro base station 70 by the displacement measuring instruments 40 for calculation processing to ensure the timeliness of data transmission, wherein the block diagram of the system after networking is shown in figure 1, and outputting related data to support jacking operation of the bridge 10;

in this example, the displacement measuring instrument 40 is composed of two infrared distance measuring devices 41 and a position calibration device 42 which are paired, as shown in fig. 2, the infrared distance measuring devices 41 are arranged at predetermined positions and used for simultaneously emitting pulsed infrared light and digital pulse signals a; the position marker 42 is arranged at the irradiation point of the pulse infrared ray and is used for sending out a digital pulse signal B when receiving the pulse infrared ray sent out by the infrared distance meter 41, the digital pulse signal a and the digital pulse signal B are both sent to the smart base station 60, the data management system 80 calculates the displacement change of the bridge 10 through the time difference between the digital pulse signal a and the digital pulse signal B, the position marker 42 is also capable of reflecting pulsed infrared light to the infrared rangefinder 41, the infrared distance meter 41 sends out a digital pulse signal C to the smart base station 60 after receiving the emitted pulsed infrared light, the data management system 80 calculates the displacement change of the bridge 10 through the time difference between the digital pulse signal a and the digital pulse signal C, and the calculated displacement change of the bridge 10 can be used.

Further, the installation method of the displacement measuring instrument 40 is as follows:

measuring and laying lead points below or on the side surface of the bridge 10 by taking the coordinate control points as reference;

installing an infrared distance meter 41 at the lead point, turning on the infrared distance meter 41 and emitting a pulse infrared ray;

a lifting vehicle is used for carrying a technician to the position below the pulse infrared ray irradiation point, the technician is lifted to a specified height, and the position calibrator 42 is fixed at the infrared ray irradiation point.

Referring to fig. 3, the infrared distance measuring device 41 includes a first housing 411, a first power source 412, a first control module 413 and a first infrared receiver 414 electrically connected to the first control module 413 are disposed in the first housing 411, the first infrared receiver 414 is configured to receive pulsed infrared light reflected by the position marker 42, a first wireless communication module 415 electrically connected to the first control module 413 is disposed on a top of the first housing 411, the first control module 413 is communicatively connected to the smart base station 60 through the first wireless communication module 415, an infrared transmitter 416 configured to transmit the pulsed infrared light is further disposed on the top of the first housing, and the infrared transmitter 416 is located on a right side of the first wireless communication module 415. A transparent window 417 is disposed on the first housing 411 near the infrared transmitter 416, and the transparent window 417 is located right above the first infrared receiver 414.

Referring to fig. 4, the position calibrator 42 includes a second housing 421, a second power supply 422, a second control module 423, and a second infrared receiver 424 electrically connected to the second control module 423 are disposed in the second housing 421, a second wireless communication module 425 electrically connected to the second control module 423 is disposed at a top of the second housing 421, the second control chip 423 is communicatively connected to the smart base station 60 through the second wireless communication module 425, a window 426 is disposed at a top of the second housing 421, a reflective plate 427 is disposed at a bottom of an inner side of the second housing 421 opposite to the window 426, an adhesive fixing layer 428 is fixedly disposed at a bottom of an outer side of the second housing 421, and a number 429 is disposed on a front side surface of the second housing 421.

In practice, the adhesive fixing layer 428 may be a replaceable electrostatic sticker, a thin layer of strong glue, or the like.

The reason for using position marker 42 is that infrared has a dispersion effect on concrete and does not necessarily return all the way, resulting in inaccurate measured distance, so a reflective plate is needed, but if the angles of the reflective plates are aligned and the installation is correct, an infrared receiver is needed to form a valid signal, which is processed by the control module, sent out by the wireless communication module and compared in data management system 80 to analyze whether position marker 42 is installed in place.

By using the data management system 80, all the displacement measuring instruments 40 and the on-site exquisite base station 60 are connected to the same network system, and the infrared distance measuring instruments 41 and the position calibration instruments 42 are paired in pairs, because related instruments are more, and the outer surfaces of the displacement measuring instruments and the position calibration instruments are written with stickers to form digital numbers 428.

The existing data of the bridge 10 is obtained in an infrared measurement mode by installing the infrared distance measuring device 41 and the position calibration device 42, the infrared distance measuring device 41 and the position calibration device 42 form a group of effective infrared measuring points, a plurality of groups of measuring points are arranged at the position of the pier 20 needing to replace a support and at the middle part of the bridge 10, and the number of the measuring points at the position of the pier 20 is larger than that at the middle part of the bridge 10.

When the displacement of the bridge 10 is measured, the infrared distance measuring device 41 emits infrared light and irradiates the reflecting plate 427 of the position calibrating device 42, the reflecting plate 427 can reflect the infrared light to the infrared distance measuring device 41, the distance measuring result is generated by calculating the time difference of the two signals, the actual jacking speed of the bridge 10 is obtained by borrowing, the time information of the data pulse signal A is controlled by the built-in chip and is transmitted to the exquisite base station 60 from the first wireless communication module and the second wireless communication module; all data transmitted to the smart base stations 60 are transmitted to the regional micro base stations 70 through the smart base stations 60 and then transmitted to the data management system 80 for processing; the data management system 80 may also calculate the actual jacking speed of the other bridge 10 for the time difference between the received data pulse signal a and the data pulse signal C, calibrate the jacking speed, and finally output information such as accumulated displacement, operation time, jacking speed, etc. on the display screen of the interactive operation interface of the interactive control terminal 90.

Step 3, jacking operation:

determining whether construction conditions are met before construction, wherein the method comprises the following steps:

turning on all the displacement meters 40 and confirming that all the signals are transmitted in time;

whether the field jack 50 is safe and effective;

the zeroing adjustment check is that before the window period of traffic control, the bridge 10 may have a slight displacement due to the vibration of vehicles coming and going, and the data needs to be zeroed and adjusted after the traffic control is started;

each monitoring personnel at the construction site confirms whether the irrelevant personnel leave the site or not;

whether emergency measures are in place or not and whether safety conditions are met or not.

When construction conditions are met, a signal instruction is issued through the interactive control terminal 90, the signal instruction is issued to a pump set control system 100 of the jack 50 through the exquisite base station 60, the pump set control system 100 sends a hydraulic control signal according to the received signal instruction and transmits the hydraulic control signal to a branch pump set, the branch pump set enables each jack 50 to start to synchronously jack the bridge 10 to a required jacking height by controlling oil pressure in an oil way, and the displacement condition of the bridge 10 is monitored in the jacking process of the bridge 10, so that the working state of each jack 50 is adjusted;

the displacement situation can be visually seen on the interactive interface of the interactive control terminal 90, so that the stress state of the bridge 10 is analyzed, for example, jacking is stopped immediately when unreasonable displacement occurs in the midspan, and a stop signal can be rapidly transmitted to the exquisite base station 60 and then sent to the pump set control systems 100 of the jacks 50.

Step 4, removing the support:

because many of the supports of the original design can not meet the current standard, the supports need to be replaced by larger supports. Thus, after the bridge 10 is lifted to a predetermined position and is maintained, the old abutment of the bridge 10 and a portion of concrete on the top of the pier 20 are removed;

and 5: replacing the support: replacing a new holder 120 having a larger size than the old holder;

and 6, descending to a specified position: the interactive control terminal 90 issues a signal instruction, the smart base station 60 issues the signal to the pump group control system 100 of the jack 50, the pump group control system 100 converts the data information into a hydraulic control signal and transmits the hydraulic control signal to the sub-pump group, and the sub-pump group enables each jack 50 to synchronously descend to a specified position (the same data route is adopted when the hydraulic jack 50 stops and descends) by controlling the oil pressure in the oil way, so that the bottom of the bridge 10 is supported on a new support 120, and the jack 50 and the support structure 30 are taken down.

In the jacking operation process, the risk early warning is further performed on the jacking operation process of the bridge 10 through the engineering risk early warning system 110, the engineering risk early warning system 110 performs the risk early warning on the actual jacking speed of the bridge 10 and controls the working state of the jack 50 based on the determined jacking control speed of the bridge 10, the relation between the actual jacking speed and the displacement of the bridge 10 obtained based on the collected data continuous analysis, and the displacement difference between the two ends and the middle of the bridge 10.

The working principle of the engineering risk early warning system 110 is as follows:

firstly, a designer analyzes the current situation of the bridge 10 according to collected data and determines the maximum jacking speed which can be borne by the bridge 10;

then, according to the requirement of a construction period, such as ten o 'clock at night to six o' clock at morning, determining reasonable maneuvering time in the construction period, subtracting the replacement time of a support, dividing the rest time into a jacking part and a descending part, and finally dividing the distance required by jacking by the time to determine the standard speed of jacking;

comparing the jacking standard speed with the jacking speed determined by a designer, and if the jacking standard speed is within the range, taking the jacking standard speed as a jacking control speed;

inputting the jacking control speed and the maximum jacking speed into the engineering risk early warning system 110;

in the jacking process of the bridge 10, when the actual jacking speed is lower than the jacking control speed, the speed line is displayed as green on a screen, and no special jacking prompt sound exists;

when the actual jacking speed reaches 90% of the control speed, considering that the oil pressure unloading of the jack 50 needs buffering time, the speed cannot be higher than the speed during automatic uniform loading, and a short prompt sound with long intervals is emitted;

in consideration of the actual engineering situation, the progress may need to be accelerated due to field reasons, a technical responsible person is required to input a password to confirm operation, and the operator is allowed to manually increase the actual jacking speed at this time, but the engineering risk early warning system 110 reversely calculates a smooth acceleration according to the loading speed and the unloading speed of the oil pressure in the jack 50, so as to limit the speed increase value, and avoid the inertia effect caused by untimely shutdown to enable the jacking height of the bridge 10 to exceed the maximum height. At the moment, lines on the screen are displayed in yellow, and continuous prompt sounds with common intervals are emitted;

at any time, the engineering risk early warning system 110 continuously analyzes the relationship between the speed and the displacement, and particularly, if the emergency shutdown is performed at a certain time, the unloading speed required by the oil pressure of the jack 50 and the final jacking displacement margin are determined according to the current actual jacking speed, and when the margin has the engineering risk, the actual jacking speed is generally limited, and a corresponding risk source is prompted on an interactive interface.

Meanwhile, according to the displacement of the beam end and the middle of the bridge 10, the displacement difference between the beam end and the middle can be analyzed, and from the perspective of risk early warning, when the displacement of the two sides is inconsistent with the design requirement, the actual jacking speed is reduced. And calculating a risk threshold value of the displacement difference through a data processing system, carrying out expansion prediction of the displacement difference according to the stage time of the increase of the displacement difference, comparing the expansion value of the displacement difference with the allowable value of the displacement difference, determining a safety range in percentage according to the allowable value requirement of the displacement difference, then calculating the lifting speed required to be reduced in a reverse mode, giving a risk early warning on an interactive interface, prompting that the risk source is abnormal displacement in the middle of the bridge 10, and sending continuous prompt sound with short intervals.

Due to the continuity of the pulse signals, the displacement of the bridge 10 can be monitored all the time, but the manual monitoring still has the risks of omission and misjudgment, and after the conditions of safety control are set in advance, the jack 50 can be automatically and rapidly stopped by the engineering risk early warning system 110.

The computer software inputs the limiting parameters set by the designer, and the data processing system forms the engineering risk early warning system 110 by analyzing the displacement data. When observing the state and data of the prediction model of the bridge 10, the manager of the control center can obtain the relevant prompt of the engineering risk early warning and adjust the jacking pressure of each support in time. The data processing system records the construction process, and can obtain effective condition feedback particularly when special conditions which are not considered in the design stage occur, thereby avoiding the situation that field personnel judge the jacking condition of the bridge 10 through experience in a visual inspection mode, enabling the field personnel to adjust the jacking pressure in time according to the condition and greatly reducing the engineering risk.

The technical solution provided by the present invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (4)

1. A displacement measuring device for jacking a bridge is characterized by comprising a plurality of exquisite base stations arranged along the length direction of the bridge and a plurality of displacement measuring instruments respectively arranged at preset measuring points, wherein each displacement measuring instrument comprises infrared distance measuring devices and position calibrators which are paired in pairs, and the infrared distance measuring devices are arranged at preset positions and used for simultaneously emitting pulse infrared rays and digital pulse signals A; the position calibrator is arranged at the irradiation point of pulse infrared light at the bottom of the bridge and used for sending a digital pulse signal B when receiving the pulse infrared light sent by the infrared distance meter, and the digital pulse signal A and the digital pulse signal B are uploaded to a data management system through a smart base station and a 5G micro base station;

the infrared distance measuring device comprises a first shell, a first power supply, a first control module and a first infrared receiver electrically connected with the first control module are arranged in the first shell, the first infrared receiver is used for receiving pulse infrared light reflected by the position calibrator, a transmission window is further arranged on the first shell right above the first infrared receiver, an infrared transmitter and a first wireless communication module which are electrically connected with the first control module are arranged at the top of the first shell, the infrared transmitter is used for emitting pulse infrared light, and the first control module is in communication interconnection with the exquisite base station through the first wireless communication module;

the position calibrator comprises a second shell, wherein a second power supply, a second control module and a second infrared receiver electrically connected with the second control module are arranged in the second shell, a second wireless communication module electrically connected with the second control module is arranged at the top of the second shell, the second control module is in communication interconnection with the exquisite base station through the second wireless communication module, a window is formed in the top of the second shell, and a reflecting plate is arranged at the bottom of the inner side of the second shell, which is right opposite to the window.

2. The displacement measuring device for bridge jacking according to claim 1, wherein: and the infrared distance meter also sends a digital pulse signal C to the exquisite base station after receiving the pulse infrared light emitted by the position calibrator.

3. The displacement measuring device for bridge jacking according to claim 1, wherein: and the bottom of the outer side of the second shell is fixedly provided with an adhesive fixing layer.

4. A displacement measuring device for bridge jacking according to claim 1 or 3, wherein: a number is provided on a front side surface of the second housing.

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