CN109945925B - Temperature and humidity sensor protection device buried in gravel soil subgrade and application method - Google Patents
Temperature and humidity sensor protection device buried in gravel soil subgrade and application method Download PDFInfo
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- CN109945925B CN109945925B CN201910242969.2A CN201910242969A CN109945925B CN 109945925 B CN109945925 B CN 109945925B CN 201910242969 A CN201910242969 A CN 201910242969A CN 109945925 B CN109945925 B CN 109945925B
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Abstract
The invention discloses a temperature and humidity sensor protection device buried in a gravel soil subgrade and a use method thereof, wherein the temperature and humidity sensor protection device comprises a protection shell for containing a temperature and humidity sensor and an insulated metal wire fixed on the protection shell; a plurality of air holes are uniformly formed in the protective shell, and a top cover is arranged at one end of the protective shell through threads; the insulated metal wires are arranged in a U shape, the bottoms of the insulated metal wires are wound around and fixed on the protective shell, and the two ends of the insulated metal wires are horizontally led out to the outer side of the roadbed. The temperature and humidity sensor embedding process is controllable, the probes of the temperature and humidity sensor are in contact with fine soil, the contact degree of the probes of the temperature and humidity sensor and gravel soil is improved, and the temperature and humidity measurement accuracy is ensured. The invention solves the problems of sensor displacement and difficult later positioning caused by the fact that the sensor embedded in coarse soil is possibly disturbed by testing the resistance of the metal wire. The invention solves the problem that the sensor is easy to be extruded and damaged by the gravels on the gravel-containing road foundation.
Description
Technical Field
The invention relates to the technical field of engineering monitoring, in particular to a temperature and humidity sensor protection device buried in a gravel soil subgrade and a use method thereof.
Background
Survey shows that the distribution area of frozen soil (> 1 m) in middle and deep seasons of China approximately occupies 1/3 of the area of the China. The freezing injury of the roadbed in the frozen soil area is a prominent problem which troubles the construction and safe operation of roads in northern and western China for a long time, wherein the water migration and temperature change in the roadbed are important reasons causing the frost heaving of the roadbed. Therefore, in the highway engineering in northern areas of China, it is necessary to monitor the moisture and temperature changes in the roadbed by using a temperature/humidity sensor. In addition, in many areas in northern China, the roadbed filling mostly adopts on-site filling soil containing broken stones, the existing temperature/humidity sensors are generally designed to be only suitable for measuring the temperature and the water content of fine-grained soil, such as clay, silt and the like, and the existing technology has many defects for coarse-grained soil filling soil foundations. The measurement accuracy of a temperature/humidity sensor is affected by many factors, such as the shape of the sensor itself, the angle of placement, the grain composition of the embedded medium, the degree of compaction, and the like. Generally speaking, the main factors influencing the measurement accuracy of the sensor include two aspects of the characteristics of the sensor and the embedding condition.
For the burying of a conventional sensor such as an earth pressure cell under fill conditions, the general procedure is as follows:
1) and excavating a pit groove to a preset position at a preset measuring point.
2) The base bed surface is embedded in the leveling sensor, so that the sensor is compact, uniform and level.
3) The sensors are placed as required.
4) Protecting a sensor; generally, graded sand is adopted to prepare a protective layer above a sensing film, and the particle size requirement of the protective layer can be properly relaxed when the sensor is buried in coarse-grained soil. The protective layer should be prepared by layered rolling to ensure compactness
5) And backfilling the in-situ soil medium. And (3) spreading and layering and compacting the thin layer to ensure that the gradation, the water content and the density of the materials around the sensor are consistent with those of the surrounding soil body.
From the above steps, if the temperature and humidity sensor is arranged in the coarse-grained soil according to the traditional burying method, the following disadvantages will exist:
1) the sensor measurement validity is not guaranteed. When a temperature/humidity sensor is buried in coarse-grained soil and stone materials for measurement, the probe of the sensor cannot be in full contact with the soil due to the fact that the particles of the soil are large, and therefore a test result is wrong.
2) The sensors are buried in the road bed containing broken stones, and the sensors are easily extruded and damaged under the condition of field construction and rolling because broken stones, blocks, stones and the like in the road bed have large grain sizes and sharp edges and corners.
3) In the roadbed filling construction process, because factors such as embankment filling and slope cutting in the construction process are adopted, the outer edge of a slope toe is dynamically adjusted all the time, a sensor is often buried in the construction stage, and the accurate position and the later stage of the sensor are difficult to accurately position when the construction is finished.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a temperature and humidity sensor protection device and a use method, wherein the temperature and humidity sensor probe can be ensured to be fully contacted with a field soil body, the temperature and humidity sensor can be prevented from being damaged by crushed stone, and the position of the sensor can be accurately determined.
The technical scheme is as follows: a temperature and humidity sensor protection device buried in a gravel soil subgrade comprises a protection shell for containing a temperature and humidity sensor and an insulated metal wire fixed on the protection shell; a plurality of air holes are uniformly formed in the protective shell, and a top cover is arranged at one end of the protective shell through threads; the insulated metal wires are arranged in a U shape, the bottoms of the insulated metal wires are wound around and fixed on the protective shell, and the two ends of the insulated metal wires are horizontally led out to the outer side of the roadbed.
The invention also comprises a protective sleeve horizontally laid under the ground; the insulated metal wire is laid in the protective sleeve.
Furthermore, the insulated metal conducting wire and a cable of the temperature and humidity sensor are bundled and are jointly arranged in the protective sleeve.
The use method of the temperature and humidity sensor protection device buried in the gravel soil roadbed comprises the following steps:
the method comprises the following steps: screening the field soil sample, filling the field screened fine soil into the protective shell, wherein the filling depth is greater than the length of a probe of the temperature and humidity sensor, and compacting the soil until the soil is consistent with the compaction degree of the field roadbed soil; then, a probe of the temperature and humidity sensor faces downwards, the temperature and humidity sensor is stably inserted into the soil body in the protective shell, the temperature and humidity sensor is placed into the protective shell, the field soil sample is continuously filled to be full, and the compactness is kept consistent with that of the field roadbed soil; then screwing the top cover;
step two: excavating an embedding groove, placing the temperature and humidity sensor protection device configured in the step one in an excavated embedding pit, and placing the temperature and humidity sensor protection device at a point to be detected;
step three: the bottom of the insulated metal wire is wound around and fixed on the protective shell, and then two ends of the insulated metal wire are horizontally led out to the outer side of the roadbed;
step four: continuously backfilling the in-situ soil body on the site, carrying out layered rolling, and controlling the compactness of the in-situ soil body to be the same as that of the in-situ soil body until the backfilling material fills the whole burying pit;
step five: and measuring the total resistance of the insulated metal wire by an ammeter, and obtaining the horizontal distance from the embedded position of the temperature and humidity sensor to the measuring point according to the resistance value of the unit length of the insulated metal wire and the measured total resistance.
Has the advantages that: (1) the temperature and humidity sensor embedding process is controllable, the probes of the temperature and humidity sensor are in contact with fine soil, the contact degree of the probes of the temperature and humidity sensor and gravel soil is improved, and the temperature and humidity measurement accuracy is ensured. (2) The invention effectively solves the problems of sensor displacement and difficult later positioning caused by the fact that the sensor embedded in coarse soil is possibly disturbed by testing the resistance of the metal wire. (3) The invention effectively solves the problem that the sensor is easy to be extruded and damaged by the broken stones on the road foundation containing the broken stones.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
Referring to fig. 1, the temperature and humidity sensor protection device buried in a gravel soil subgrade comprises a protection shell 2 for containing a temperature and humidity sensor 1 and an insulated metal lead 4 fixed on the protection shell 2.
A plurality of air holes are uniformly formed in the protective shell 2, and in order to improve water permeability and air permeability and simultaneously block extrusion of broken stones, the air holes are closely arranged and the aperture is smaller than the average particle size of the broken stones. The material of the protective shell 2 is preferably PVC, and the inertia of the PVC ensures the durability of the protective shell under the field application condition.
And a top cover 3 is arranged at one end of the protective shell 2 through threads, so that the temperature and humidity sensor 1 can be conveniently disassembled and assembled. The cable 5 of the temperature and humidity sensor 1 is led out through a round hole in the top cover 3.
The insulated metal wire 4 is arranged in a U shape, the bottom of the insulated metal wire 4 is wound around and fixed on the protective shell 2, and two ends of the insulated metal wire 4 are horizontally led out to the outer side of the roadbed.
The insulated metal conductor 4 is bundled with a cable 5 and placed together in a protective casing laid horizontally under the ground. The protective sleeve can protect the insulated metal wire 4 and the cable 5 from being damaged by the crushed gravel soil. And when the buried position of the protective casing 2 is changed due to external factors in the construction process, the insulated metal wire 4 and the cable 5 can freely move up and down along the protective casing.
The use method of the temperature and humidity sensor protection device buried in the gravel soil roadbed comprises the following steps:
the method comprises the following steps: screening the field soil sample, filling the field screened fine soil into the protective shell 2, wherein the filling depth is greater than the length of the probe 6 of the temperature and humidity sensor 1, and compacting the soil until the soil is consistent with the compaction degree of the field roadbed soil; then, a probe 6 of the temperature and humidity sensor 1 faces downwards, the temperature and humidity sensor is stably inserted into the soil body in the protective shell 2, the temperature and humidity sensor 1 is placed, then, the field soil sample is continuously filled until the soil sample is filled, and the compactness is kept consistent with the field roadbed soil; then screwing the top cover 3; the probe 6 can be fully contacted with the on-site fine-grained soil, so that the accuracy of a test result is ensured, and the probe can be prevented from being separated from the soil body due to the loss of the fine-grained soil around the sensor;
step two: excavating an embedding groove, placing the temperature and humidity sensor protection device configured in the step one in an excavated embedding pit, and placing the temperature and humidity sensor protection device at a point to be detected;
step three: the bottom of the insulated metal wire 4 is wound around and fixed on the protective shell 2, the insulated metal wire 4 and the cable 5 are bound together by a binding belt every 1-2 m, then the insulated metal wire is sleeved in a horizontally placed protective sleeve, and two ends of the insulated metal wire 4 are horizontally led out to the outer side of the roadbed;
step four: continuously backfilling the in-situ soil body on the site, carrying out layered rolling, and controlling the compactness of the in-situ soil body to be the same as that of the in-situ soil body until the backfilling material fills the whole burying pit;
step five: the total resistance of the insulated metal wire 4 is measured by an ammeter, and the horizontal distance from the embedded position of the temperature and humidity sensor 1 to the measuring point can be obtained according to the resistance value of the unit length and the measured total resistance.
Claims (2)
1. The utility model provides a bury temperature and humidity sensor protection device in rubble dirt road bed which characterized in that: comprises a protective shell (2) for containing a temperature and humidity sensor (1) and an insulated metal wire (4) fixed on the protective shell (2); a plurality of air holes are uniformly formed in the protective shell (2), and the air holes are closely distributed, and the aperture is smaller than the average particle size of the crushed stone, so that the water and air permeability are improved, and the extrusion of the crushed stone is blocked;
a top cover (3) is installed at one end of the protective shell (2) through threads; the insulated metal wires (4) are arranged in a U shape, the bottoms of the insulated metal wires (4) are wound around and fixed on the protective shell (2), and two ends of each insulated metal wire (4) are horizontally led out to the outer side of the roadbed, so that the temperature and humidity sensor (1) is convenient to disassemble and assemble;
also comprises a protective sleeve horizontally laid under the ground; the insulated metal wire (4) is laid in the protective sleeve;
insulating metal wire (4) are tied up with cable (5) of temperature and humidity sensor (1), arrange the protective sheath in jointly, and protective sheath can protect insulating metal wire (4) and cable (5) not receive the extrusion of gravel soil impaired to when external factor leads to burying underground the position of protective housing (2) to change in the work progress, insulating metal wire (4) and cable (5) can be along the free activity from top to bottom of protective sheath.
2. The use method of the temperature and humidity sensor protection device buried in the gravel soil subgrade according to the claim 1 is characterized by comprising the following steps: the method comprises the following steps: screening the field soil sample, filling the fine soil screened on the field into the protective shell (2), wherein the filling depth is greater than the length of a probe (6) of the temperature and humidity sensor (1), and compacting the fine soil until the filling depth is consistent with the compaction degree of the field roadbed soil; then, a probe (6) of the temperature and humidity sensor (1) faces downwards, the temperature and humidity sensor is stably inserted into the soil body in the protective shell (2), the temperature and humidity sensor (1) is placed, then, the field soil sample is continuously filled until the soil sample is filled, and the compaction degree is kept consistent with the field roadbed soil; then screwing the top cover (3);
step two: excavating an embedding groove, placing the temperature and humidity sensor protection device configured in the step one in an excavated embedding pit, and placing the temperature and humidity sensor protection device at a point to be detected;
step three: the bottom of the insulated metal wire (4) is wound around and fixed on the protective shell (2), and then two ends of the insulated metal wire are horizontally led out to the outer side of the roadbed;
step four: continuously backfilling the in-situ soil body on the site, carrying out layered rolling, and controlling the compactness of the in-situ soil body to be the same as that of the in-situ soil body until the backfilling material fills the whole burying pit;
step five: the total resistance of the insulated metal wire (4) is measured through an ammeter, and the horizontal distance from the embedded position of the temperature and humidity sensor (1) to the measuring point can be obtained according to the resistance value of the unit length and the measured total resistance.
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