CN206945047U - City underground engineering allpurpose model experimental system - Google Patents
City underground engineering allpurpose model experimental system Download PDFInfo
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- CN206945047U CN206945047U CN201720408735.7U CN201720408735U CN206945047U CN 206945047 U CN206945047 U CN 206945047U CN 201720408735 U CN201720408735 U CN 201720408735U CN 206945047 U CN206945047 U CN 206945047U
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- 230000003068 static effect Effects 0.000 description 6
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- 239000002689 soil Substances 0.000 description 4
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- 238000009529 body temperature measurement Methods 0.000 description 2
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- 238000009412 basement excavation Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
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Abstract
The utility model discloses a kind of city underground engineering allpurpose model experimental system.The system includes sensor, deformeter and processor, and sensor is placed in the relevant position of test specimen, and sensor is connected with deformeter, and deformeter is connected with processor；Sensor, measurement data is exported according to the ess-strain of test specimen；Deformeter, the measurement data of collection sensor output, and transmit to processor；Control module, analysis module and display module are provided with processor；Wherein, control module, control signal is sent to deformeter, controlled strain instrument is from sensor collection measurement data and real-time Transmission to analysis module；And analysis module, measurement data is carried out measurement result is calculated, and export to display module and shown.
Description
Technical Field
The utility model relates to a measure variable quantity fields such as stress-strain, specifically relate to a multi-functional model experimental system of city underground works.
Background
Nowadays, urban underground engineering is increasingly paid attention, and the process of monitoring stress and strain in the excavation process is particularly important no matter in a process field and a rock-soil laboratory. The existing acquisition system is not high in system integrity and poor in software and hardware integration, most of the existing acquisition systems acquire data through strain gauges and then import the data into a computer for processing, and real-time data interaction of the strain gauges and sensors by the computer cannot be realized.
SUMMERY OF THE UTILITY MODEL
To the above problem, the embodiment of the utility model provides a multi-functional model experiment system of city underground works has realized the direct control to strainometer, sensor through the treater that has the test analysis function of meeting an emergency to on feeding back the data that the sensor was surveyed in real time to treater (like the computer), realize digital display, multi-functional, real-time portable collection and analysis to ground body monitoring data and other type data.
The embodiment of the utility model provides a multi-functional model experiment system of city underground works. The system comprises a sensor, a strain gauge and a processor, wherein the sensor is arranged at the corresponding position of a test piece and is connected with the strain gauge, and the strain gauge is connected with the processor;
the sensor outputs measurement data according to the stress strain of the test piece;
the strain gauge is used for acquiring measurement data output by the sensor and transmitting the measurement data to the processor;
the processor is provided with a control module, an analysis module and a display module;
the control module sends a control signal to the strain gauge, controls the strain gauge to collect measurement data from the sensor and transmits the measurement data to the analysis module in real time;
and the analysis module is used for calculating the measurement data to obtain a measurement result and outputting the measurement result to the display module for displaying.
The embodiment of the utility model provides a for overcoming current monitoring system monitoring knot because of software and hardware integration degree is not high, and the control of strainmeter is convenient directly perceived inadequately, but the data acquisition real-time display, and the poor scheduling problem of strainmeter and sensor compatibility utilizes the treater that has analysis function, provides city underground works multi-functional model experimental system and integrates sensor, strainmeter, treater three for data acquisition is convenient, control instrument is directly perceived.
Drawings
FIGS. 1(a) to 1(c) are schematic diagrams of a specific bridge structure provided in an embodiment of the present invention.
Fig. 2 is a flowchart of a stress-strain acquisition and analysis method according to another embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a stress-strain acquisition and analysis system according to another embodiment of the present invention.
Detailed Description
For the purpose of promoting an understanding of the invention, reference will now be made in detail to the present invention as illustrated in the accompanying drawings and described in the following description. The following description is provided to more clearly illustrate the upgrading and improvement of the present invention, and should not be construed as limiting the scope of the present invention.
The embodiment of the utility model provides a integrate sensor, digital display formula multi-functional static strain gauge, treater to the software realizes the visual control to the strain gauge, and the feedback directly perceived of data acquisition.
The scheme is illustrated by the workflow of the present system.
And (I) according to the monitoring requirement, selecting a corresponding sensor, arranging the sensor at a corresponding position of the test piece, and connecting the sensor to the strain gauge according to a preset mode.
Firstly, according to the monitoring requirement, selecting a corresponding sensor, and arranging the sensor at a corresponding position of the test piece. If the strain gauge is the strain gauge, the strain gauge is stuck to the surface of the test piece by glue; if the soil pressure cell is the soil pressure cell, the soil pressure cell is buried in the corresponding position of the model; other types of sensors are installed as desired. And the placed sensor is detected, the installation quality is ensured, and then the sensor is connected with the digital display multifunctional static strain gauge.
Secondly, selecting the bridge type of the measuring point of the strain gauge according to the type of the sensor, and connecting the sensor to the strain gauge according to a preset mode, so that the measuring point accessed by the sensor forms a bridge circuit of the selected type. The bridge circuit type formed by the measuring points comprises a full bridge circuit, a half bridge circuit or an 1/4 bridge circuit.
In the embodiment, a plurality of measuring points are arranged in the strain gauge, and each measuring point is provided with a port connected with an external sensor and a measuring point circuit; a plurality of resistors corresponding to each measuring point are further arranged in the strain gauge, and one or more of the resistors can be connected to or disconnected from the measuring point circuit of the corresponding measuring point; when measurement is carried out, the access end of the external sensor is inserted into the corresponding port of the measuring point, the corresponding resistor in the measuring point circuit is switched on or off, and the measuring point forms a circuit of a preset type bridge.
When the specific type of circuit is realized, the access end of the external sensor is inserted into the corresponding port of the measuring point, all resistors in the measuring point circuit are disconnected, and the measuring point forms a full-bridge circuit; the access end of the external sensor is inserted into a corresponding port of a measuring point and is communicated with 2 resistors in a measuring point circuit, and the measuring point forms a full half-bridge circuit; the access end of the external sensor is inserted into a corresponding port of the measuring point, and is communicated with 3 resistors in the measuring point circuit, and the measuring point forms an 1/4 circuit.
Referring to fig. 1(a) to 1(C), each station has five ports 201, port a, port B, port BQ, port C and port D;
FIG. 1(a) is a schematic connection diagram of a full-bridge circuit, when the access end of an external sensor including 4 strain gauges 202 is inserted into a port A, a port B and a port C of a measurement point, the measurement point constitutes the full-bridge circuit;
FIG. 1(B) is a schematic diagram of a half-bridge circuit connection, in which when the access end of an external sensor including 2 strain gauges is inserted into a port A, a port B and a port C of a measurement point, the measurement point constitutes a half-bridge circuit;
FIG. 1(c) is a schematic diagram of 1/4 bridge circuit connection, wherein the access end of the external sensor including 1 strain gauge is inserted into port A and port BQ of the measuring point, and the measuring point constitutes 1/4 bridge circuit.
Through setting a plurality of measuring points, for example, 20 measuring points and 1 specific force measuring point, all measuring points are internally provided with corresponding precise low-temperature drift resistors, and each measuring point can form a full bridge, a half bridge and an 1/4 bridge in different bridge combination modes, so that different measuring bridges can be switched according to actual measuring requirements, and the flexibility is improved for complex engineering tests.
Secondly, connecting a processor with a strain test analysis function with a strain gauge connected with a sensor;
the processor with the strain test analysis function may be implemented as a computer installed with static strain test analysis system software. When the computer is connected with the strain gauge and the sensor, the connection mode can be divided into wired connection and wireless connection. Each wireless strain gauge and the gateway are automatically networked, and each strain gauge has a routing function, so that the multifunctional model experiment system for the large-scale urban underground engineering is formed. Or all the static strain gauges can be connected through a bus, and the computer is connected with the first USB wire to form a wired urban underground engineering multifunctional model experiment system.
And (III) setting parameters and acquisition modes acquired by the strain gauge according to the selected sensor and the physical quantity to be measured.
Furthermore, before measurement, a balancing operation is generally performed to read the initial imbalance value of each measurement point for correcting the measurement result. This is a preparation before formal measurement, and if this measurement is the same as the parameter set by the previous measurement, even the balance result is the same, the balance operation can be omitted.
Before (iii), this embodiment further includes: carrying out balance operation, and reading the initial unbalance value of each measuring point; the acquiring of the measurement data output by the sensor comprises: and subtracting the corresponding initial unbalance value from the measurement data of the measuring point, and correcting the measurement data.
In the third step, the measurement channels are configured according to the type of the sensor and the physical quantity to be measured, and a piece of configuration data is generated for each measurement channel, wherein the configuration data comprises channel identification, measurement content and physical quantity parameters; specifically, a stress-strain channel, a bridge-type sensor channel, a thermocouple channel, a thermal resistance channel, a voltage channel, a nonlinear resistance channel, and a vibrating wire gauge channel are configured according to the type of the sensor and the physical quantity to be measured; parameters (such as physical quantity parameters required to be acquired) acquired by the strain gauge and an acquisition mode are set by adjusting configuration data of each channel.
Further, the software interface may display the configured channels one by one according to the sensor type, such as: stress-strain channels, bridge sensor channels, thermocouple channels, thermal resistance channels, voltage channels, and nonlinear resistance channels. The channel identifier includes a channel name, a channel serial number, and a channel description, and the measurement content indicates a physical quantity to be measured by the channel. And the software can also display the values of different physical quantities measured by different channels, such as: the physical quantity parameters corresponding to the stress-strain channel comprise strain sheet resistance, wire resistance, elastic modulus, Poisson's ratio, full scale, engineering unit and the like.
Further, this embodiment may also set a corresponding warning value for the connected sensor, where the warning value includes "warning upper limit", "warning lower limit", "warning upper limit", and "warning lower limit".
And (IV) after the measurement is started, controlling the strain gauge to acquire the measurement data output by the sensor according to the set acquisition parameters and acquisition mode.
The set acquisition mode comprises trial acquisition, single acquisition, timing acquisition and continuous acquisition:
under a trial collection mode, controlling the strain gauge to collect measurement data output by the sensor, transmitting the measurement data to the processor in real time for calculation to obtain a measurement result, and monitoring whether the system is normal or not according to the measurement result;
under a single acquisition mode, controlling the strain gauge to acquire measurement data output by the sensor, transmitting the measurement data to the processor in real time to obtain a measurement result, displaying the measurement result, and stopping acquisition;
under a timing acquisition mode, controlling a strain gauge to acquire measurement data output by a sensor at intervals;
and under the continuous acquisition mode, controlling the strain gauge to immediately perform next acquisition after the end of one acquisition.
Namely, the present embodiment provides the following four acquisition modes:
1. the 'trial collection' is used for system detection, the trial collection is generally selected before measurement is started, whether the measurement result is normal or not is examined, whether the system is normal or not is judged, and the measurement data is not stored by a computer.
2. The single acquisition is used for manual measurement, and after the single acquisition is carried out, the data is stored in a computer and the acquisition is stopped.
3. "timed acquisition" is a scan measurement of the strain gauge at intervals. By setting the timing interval, the computer can automatically scan and measure once every a period of time, and the measured result is automatically stored until the user stops collecting.
4. The continuous acquisition is that the next acquisition is carried out immediately after the end of one acquisition, so that the data as much as possible can be acquired in the shortest time and can be used when the observation signal changes rapidly.
And (V) transmitting the measurement data to a processor in real time to calculate to obtain a measurement result, and displaying the measurement result.
And generating a multi-page table view, a single-page table view, a time curve view and/or a strain plot view according to the measurement results, and displaying the corresponding views on a screen. The present embodiment provides the following four views:
(a) multi-page table: the multi-page table is a table for recording measurement data. The method can store the results of multiple measurements in a table form, and is convenient for browsing data and comparing the results before and after the data is browsed. The recorded information includes the data of all selected measuring channels, the engineering information of measuring time and the like.
(b) Single page table: the single-page form can display the data measured at one time in one form. When the number of measurement channels is large, data of all channels can be observed.
(c) Time curve: the time curve is used for describing the curve of the change rule of the measurement parameters with time in the process of multiple scanning measurement of the selected channel. Alternatively, the measurement data of a plurality of channels may be displayed on a graphic.
(d) Strain curve: for displaying the strain time course curve.
Referring to fig. 2, the utility model discloses the multi-functional model experiment system work flow chart of city underground works that still another embodiment provided. The processor sends control signals to the strain gauge and the sensor, the sensor collects data and transmits the data back to the strain gauge to generate measurement data, the measurement data are transmitted to the processor to be analyzed and processed, and finally output and display are carried out.
The utility model discloses a further embodiment explains this scheme through the concrete use and the measuring condition of different grade type sensor.
(a) Stress strain: for stress or strain test, it is first necessary to select the type of full bridge, half bridge, 1/4 bridge, and set the resistance, sensitivity, etc. of the sensor (such as strain gauge).
(b) Bridge sensor: the bridge sensor is connected with a suitable sensitivity which corresponds directly to the physical quantity to be measured. For example, a displacement meter label of 2.3uεMm, in which case a sensitivity of 2.3 can be set in the channel configuration, and the following engineering unit is set to mm, the displacement value of the displacement meter can be displayed directly by means of a table or a graph.
(c) Thermocouple: the temperature can be measured by directly connecting a thermocouple, and the sensor is directly connected to the ends of the ports B and D of a measuring point of the strain gauge. It is also desirable to set the "cold end temperature", i.e., the ambient temperature at which the sensor is located when it is "auto-balanced" prior to measurement by the sensor. The type of sensor for strain may be selected in the "thermocouple type" column.
(d) Thermal resistance: the "1/4 bridge" is chosen to connect the measured thermal resistance directly between the site ports "A" and "BQ". The "half-bridge" is selected, the thermal resistance to be measured is connected between the test point ports "A" and "B", and the resistance for comparison is connected between "B" and "C".
(e) Voltage: the sensor can be used for measuring voltage or outputting voltage, the measured physical quantity is in direct proportion to the voltage, and signals are directly connected to the terminals 'B' and 'D' (if the measured physical quantity is in a nonlinear relation with the voltage, a nonlinear voltage can be selected).
(f) Resistance: a resistance or resistive sensor may be measured and the physical quantity measured is proportional to the resistance (if the physical quantity measured is non-linear with the resistance, a non-linear resistance may be chosen). The "1/4 bridge" is selected to connect the measured resistance directly between site ports "A" and "BQ". The half-bridge is selected, the resistance to be measured is connected between the measuring point ports A and B, and the resistance for comparison is connected between the measuring point ports B and C.
(g) Nonlinear voltage: for a voltage-measuring sensor, the measured physical quantity is not proportional to the voltage, and a non-linear relationship between the voltage and the physical quantity needs to be set (the measured physical quantity is linear to the voltage, and the measured voltage is directly selected).
(h) Nonlinear resistance: for measuring resistive sensors. The measured physical quantity is not proportional to the resistance, and a non-linear relationship between the resistance and the physical quantity needs to be set (the measured physical quantity is linear to the resistance, and the measured resistance is directly selected). The "1/4 bridge" is selected to connect the measured resistance directly between site ports "A" and "BQ". The half-bridge is selected, the resistance to be measured is connected between the measuring point ports A and B, and the resistance for comparison is connected between the measuring point ports B and C.
(i) A vibrating wire gauge: for mating with a vibrating wire strain gauge. The measurement type can be selected from temperature measurement and non-temperature measurement, and a vibrating wire strain gauge library can also be edited.
Referring to fig. 3, a multifunctional model experiment system for urban underground engineering according to another embodiment of the invention is shown. The device comprises one or more sensors 401, a strain gauge 402 and a processor 403, wherein the sensors 401 are arranged at corresponding positions of a test piece, and the sensors are adhered to the surface of the test piece; or the sensor is embedded in the corresponding position in the test piece. The sensor 401 is connected with a strain gauge, and the strain gauge is connected with a processor; a sensor 401 for outputting measurement data according to the stress-strain of the test piece; and the strain gauge is used for acquiring the measurement data output by the sensor and transmitting the measurement data to the processor.
The processor 403 is provided with a control module 4031, an analysis module 4032 and a display module 4033, and at least three modules are used for realizing a strain test analysis function in the processor. The processor may be hosted by a computer.
The control module 4031 sends a control signal to the strain gauge, controls the strain gauge to collect measurement data from the sensor 401 and transmits the measurement data to the analysis module 4032 in real time; and the analysis module 4032 calculates the measurement data to obtain a measurement result, and outputs the measurement result to the display module 4033 for display. Further, according to different acquisition modes, the control module 4031 sends a control signal to the strain gauge to control the strain gauge to perform primary acquisition and then stops the acquisition; or controlling the strain gauge to perform scanning measurement at intervals; or controlling the strain gauge to immediately perform the next acquisition after the end of the first acquisition.
When the system comprises a plurality of strain gauges, each strain gauge is provided with a wireless communication module, and different strain gauges are wirelessly connected through the wireless communication module to form a wireless test network; or each strain gauge is provided with a data bus interface, and the strain gauges form a wired test network through a data bus. Specifically, a gateway is arranged in the wireless test network, and each strain gauge is automatically networked through the gateway; the wired test network comprises at least one computer, the computer is connected with the first strain gauge through a USB data line, and other strain gauges in the network are connected to the first strain gauge after being connected in series through a data bus.
The strain gauge of the system is provided with a plurality of measuring points, and each measuring point is provided with a port connected with an external sensor and a measuring point circuit; the strain gauge is also provided with a plurality of resistors corresponding to each measuring point, and one or more of the resistors can be connected with or disconnected from the measuring point circuit of the corresponding measuring point; when measurement is carried out, the access end of the external sensor is inserted into a corresponding port of the measuring point, a corresponding resistor in the measuring point circuit is switched on or off, and the measuring point forms a circuit of a preset type of bridge.
The access end of the external sensor is inserted into a corresponding port of the measuring point, all resistors in the measuring point circuit are disconnected, and the measuring point forms a full-bridge circuit; the access end of the external sensor is inserted into a corresponding port of a measuring point and is communicated with 2 resistors in a measuring point circuit, and the measuring point forms a full half-bridge circuit; the access end of the external sensor is inserted into a corresponding port of the measuring point, and is communicated with 3 resistors in the measuring point circuit, and the measuring point forms an 1/4 circuit; wherein,
each measuring point is provided with five ports, namely a port A, a port B, a port BQ, a port C and a port D;
when the access end of an external sensor comprising 4 strain gauges is inserted into a port A, a port B and a port C of a measuring point, the measuring point forms a full-bridge circuit; when the access end of an external sensor comprising 2 strain gauges is inserted into a port A, a port B and a port C of a measuring point, the measuring point forms a half-bridge circuit; the access end of an external sensor containing 1 strain gauge is inserted into a port A and a port BQ of a measuring point, and the measuring point forms an 1/4 bridge circuit.
Further, the strain gauge also comprises a compensation strain gauge, a compensation terminal is arranged on the strain gauge, and during measurement, the compensation strain gauge is connected to the strain gauge through the compensation terminal to measure the stress or strain generated due to temperature change.
The sensors in the present system include, but are not limited to, stress strain sensors, bridge sensors, thermocouple sensors, thermal resistance sensors, voltage sensors, nonlinear resistance sensors, and vibrating wire gauges.
The specific operation of each device in this embodiment can be referred to the related description of other embodiments of the present invention.
The embodiment of the utility model provides an at first utilize sensor data collection, through cable transmission and strain gauge in, the strain gauge is with data transmission again in the computer of installing static strain test analytic system software. The data is then added to the data sequence to process the acquired data. After the calculation is finished, the result is output to a computer screen through static strain test analysis system software, and the method has the advantages of simplicity in operation, visual result and high accuracy.
Claims (10)
1. The utility model provides a multi-functional model experiment system of city underground works which characterized in that: the device comprises a sensor, a strain gauge and a processor, wherein the sensor is arranged at the corresponding position of a test piece and is connected with the strain gauge, and the strain gauge is connected with the processor;
the sensor outputs measurement data according to the stress strain of the test piece;
the strain gauge is used for acquiring measurement data output by the sensor and transmitting the measurement data to the processor;
the processor is internally provided with a control module, an analysis module and a display module;
the control module sends a control signal to the strain gauge, controls the strain gauge to collect measurement data from the sensor and transmits the measurement data to the analysis module in real time;
and the analysis module calculates the measurement data to obtain a measurement result and outputs the measurement result to the display module for displaying.
2. The system of claim 1, wherein: the system comprises a plurality of strain gauges, wherein each strain gauge is provided with a wireless communication module, and different strain gauges are wirelessly connected through the wireless communication module to form a wireless test network;
each strain gauge is provided with a data bus interface, and each strain gauge forms a wired test network through a data bus.
3. The system of claim 2, wherein: gateways are arranged in the wireless test network, and each strain gauge is automatically networked through the gateways;
the wired test network comprises at least one computer, the computer is connected with the first strain gauge through a USB data line, and other strain gauges in the network are connected to the first strain gauge after being connected in series through a data bus.
4. The system of claim 1, wherein: a plurality of measuring points are arranged in the strain gauge, and each measuring point is provided with a port connected with an external sensor and a measuring point circuit; the strain gauge is also provided with a plurality of resistors corresponding to each measuring point, and one or more of the resistors can be connected with or disconnected from the measuring point circuit of the corresponding measuring point;
when the measurement is carried out, the access end of the external sensor is inserted into the corresponding port of the measuring point, the corresponding resistor in the measuring point circuit is switched on or switched off, and the measuring point forms a circuit of a preset type bridge.
5. The system of claim 4, wherein: the access end of the external sensor is inserted into a corresponding port of the measuring point, all resistors in the measuring point circuit are disconnected, and the measuring point forms a full-bridge circuit; the access end of the external sensor is inserted into a corresponding port of a measuring point and is communicated with 2 resistors in a measuring point circuit, and the measuring point forms a full half-bridge circuit; the access end of the external sensor is inserted into a corresponding port of a measuring point and is communicated with 3 resistors in a measuring point circuit, and the measuring point forms an 1/4 circuit;
each measuring point is provided with five ports, namely a port A, a port B, a port BQ, a port C and a port D; when the access end of an external sensor comprising 4 strain gauges is inserted into a port A, a port B and a port C of a measuring point, the measuring point forms a full-bridge circuit; when the access end of an external sensor comprising 2 strain gauges is inserted into a port A, a port B and a port C of a measuring point, the measuring point forms a half-bridge circuit; the access end of an external sensor containing 1 strain gauge is inserted into a port A and a port BQ of a measuring point, and the measuring point forms an 1/4 bridge circuit.
6. The system of claim 4, wherein: the strain gauge also comprises a compensation strain gauge, wherein a compensation terminal is arranged on the strain gauge, and during measurement, the compensation strain gauge is connected to the strain gauge through the compensation terminal to measure the stress or strain generated by temperature change.
7. The system of claim 1, wherein: the sensors are arranged at corresponding positions of the test piece and comprise: the sensor is adhered to the surface of the test piece; or the sensor is embedded in the corresponding position in the test piece.
8. The system of claim 1, wherein: the sensors at least comprise stress strain sensors, bridge sensors, thermocouple sensors, thermal resistance sensors, voltage sensors, nonlinear resistance sensors and vibrating wire gauges.
9. The system of claim 1, wherein: the control module sends a control signal to the strain gauge and stops acquisition after controlling the strain gauge to perform primary acquisition; or controlling the strain gauge to perform scanning measurement at intervals; or controlling the strain gauge to immediately perform the next acquisition after the end of the first acquisition.
10. The system of claim 1, wherein the processor is a computer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720408735.7U CN206945047U (en) | 2017-04-18 | 2017-04-18 | City underground engineering allpurpose model experimental system |
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| CN201720408735.7U CN206945047U (en) | 2017-04-18 | 2017-04-18 | City underground engineering allpurpose model experimental system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106840273A (en) * | 2017-04-18 | 2017-06-13 | 中国矿业大学(北京) | City underground engineering allpurpose model experimental system |
| CN116858107A (en) * | 2023-08-17 | 2023-10-10 | 中国船舶科学研究中心 | Parallel measurement method of laser displacement sensor |
-
2017
- 2017-04-18 CN CN201720408735.7U patent/CN206945047U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106840273A (en) * | 2017-04-18 | 2017-06-13 | 中国矿业大学(北京) | City underground engineering allpurpose model experimental system |
| CN116858107A (en) * | 2023-08-17 | 2023-10-10 | 中国船舶科学研究中心 | Parallel measurement method of laser displacement sensor |
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