CN112946015B - Test device and method for measuring soft soil interface thermal contact resistance - Google Patents
Test device and method for measuring soft soil interface thermal contact resistance Download PDFInfo
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- CN112946015B CN112946015B CN202110134390.1A CN202110134390A CN112946015B CN 112946015 B CN112946015 B CN 112946015B CN 202110134390 A CN202110134390 A CN 202110134390A CN 112946015 B CN112946015 B CN 112946015B
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Abstract
The invention discloses a test device and a method for measuring soft soil interface thermal contact resistance, belonging to the field of interface thermal contact resistance test devices, in the scheme, a test device and a method for measuring soft soil interface thermal contact resistance are used for transporting a main body measuring ball to a position far away from a pile body through an electric telescopic rod, staggering the positions of cross sections of the measuring ball and soft soil damaged in the pile body pile arrangement process, reducing system errors caused by pile arrangement, increasing the detection accuracy, protecting the measuring ball and a needle-shaped temperature sensor through a protecting ball which is filled with air and is expanded in the process of transporting the measuring ball through the electric telescopic rod, not easily influencing the detection result, and after the measuring ball is transported to a specified position, the protecting ball is broken to realize that the measuring ball and the needle-shaped temperature sensor are contacted with soft mud layer, and the broken protecting ball can keep relatively complete under the dragging action of a reinforcing net and a filling pipe, convenient subsequent unified recovery, and is not easy to cause extra environmental pollution.
Description
Technical Field
The invention relates to the field of interface contact thermal resistance test devices, in particular to a test device and a method for measuring soft soil interface contact thermal resistance.
Background
Soft soil generally refers to cohesive soil which has large natural water content, high compressibility, low bearing capacity and low shear strength and is in a soft-plastic-flow-plastic state. Soft soil is a generic term of soil, and does not refer to a specific soil, and engineering often subdivides soft soil into soft cohesive soil, mucky soil, silt, peat soil, peat and the like. The high-viscosity natural water-content concrete has the characteristics of high natural water content, large natural pore ratio, high compressibility, low shear strength, small consolidation coefficient, long consolidation time, high sensitivity, high disturbance, poor water permeability, complex soil layer distribution, large difference of physical and mechanical properties among layers and the like.
Two solid surfaces that are nominally in contact with each other, with contact occurring only over a few discrete area elements, the gap between the non-contacting interfaces is often filled with air, and heat will travel through this air gap layer in a thermally conductive manner, adding additional transfer resistance, known as contact resistance, than if the solid surfaces were in full contact. The contact resistance is equal to the difference between the two interface surface temperatures divided by the heat flux. The contact thermal resistance units are: square meter, K/W.
The presence of contact resistance at the interface is mainly due to the influence of surface roughness. There are gaps between the contact points, which in most engineering practice are filled with air. Heat transfer is thus achieved by conduction and/or radiation, convection through the contact gap. The contact resistance can be seen as two parallel resistances: 1, generated from a contact area part; 2, resulting from the gap. The contact area is usually small, in particular a rough surface, whose main role is the thermal resistance generated by the gap.
Different from a common solid medium, the soft soil has certain fluidity, and the interface between two adjacent soft soil layers has no obvious boundary basically, so that the traditional method for driving the pile into the sensor is very easy to damage the interface between the soft soil layers, influence the final measurement result and cause larger measurement error.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a test device and a method for measuring the contact thermal resistance of a soft soil interface, which can realize that the interface between adjacent soft soil layers is not easy to damage in the process of driving the pile and sending the pile into a sensor, the final measurement result is influenced, and the measurement error is reduced.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
The utility model provides a survey test device of weak soil interface thermal contact resistance, includes the pile body, it has first measuring chamber and second measuring chamber to cut on the lateral wall of pile body, first measuring chamber is located the upside of second measuring chamber, equal fixedly connected with electric telescopic handle, two on the lateral wall of first measuring chamber and second measuring chamber the equal fixedly connected with of the other end of electric telescopic handle measures the ball, is located first measuring chamber measure the ball and in-house and have installed heating device, measure on the outer wall of ball a plurality of aciculiform temperature sensor of fixedly connected with, a plurality of aciculiform temperature sensor evenly distributed is on measuring the outer wall of ball, the outside cover of measuring the ball is equipped with the protection ball, the protection ball is located aciculiform temperature sensor's the outside, electric telescopic handle is close to the one end of measuring the ball and runs through the protection ball and with protection ball fixed connection, electric telescopic handle is last to cut the plenum, cut on the air vent and have ventilation hole, sliding connection has and self assorted sealed piston in the ventilation hole, cut on the lateral wall of sealed piston has a pair of air vent, the air vent runs through sealed piston, a pair of spacing slide bar of fixedly connected with on the indoor wall of ventilating sees two the one end that the indoor wall of ventilating was kept away from to spacing slide bar all runs through sealed piston and extends to sealed piston's downside, the outside cover of spacing slide bar is equipped with compression spring, compression spring's both ends are respectively in indoor wall of ventilating and sealed piston fixed connection, can realize being difficult for sending into the sensor in-process at the pile and cause the destruction of interface between the adjacent soft soil layer, influence final measuring result, reduce measuring error.
Further, a use method of the test device for measuring the soft soil interface contact thermal resistance mainly comprises the following steps:
s1, pile arrangement, wherein technicians select measurement groups and pile arrangement positions according to actual measurement requirements, and then detect whether pile bodies can normally work, including but not limited to whether an electric telescopic rod can normally extend and shorten and whether quantitative gas can be filled into a protective ball or not, and the like, and then insert the detected pile bodies into preset positions to finish the pile arrangement work;
s2, preparing, sending an instruction to the pile body which finishes the step S1, filling gas into the protective ball to enable the protective ball to be wholly bulged, then controlling the electric telescopic rod to extend, using the impact force generated by the electric telescopic rod to break the protective cover, sending the measuring ball to a specified measuring position by controlling the specific extending length of the electric telescopic rod, when the measuring ball is sent to the specified position, continuously filling the gas into the protective ball until the protective ball is broken, stopping air filling, at the moment, automatically filling soft soil into the space where the protective ball originally exists, coating the measuring ball and the needle-shaped temperature sensor, staggering the measuring positions of the measuring ball and the needle-shaped temperature sensor from the contact interface of the pile body which is broken in the step S1, and reducing the measuring error caused by the breakage of the pile arrangement process to the section;
S3, measuring interface contact thermal resistance, starting a heating device in the measuring ball at the upper side, heating the soft soil at the measuring ball at the upper side to 20 ℃ above a preset temperature, keeping the temperature for 10 minutes, then switching off the power supply of the heating device, naturally cooling the soft soil to the preset temperature, recording the temperatures of the soft soil layers of the upper and lower measuring balls, starting the heating device, keeping the temperature of the soft soil layer of the measuring ball at the upper side at the preset temperature, simultaneously detecting the temperature change of the soft soil layer of the measuring ball at the lower side for 1 hour, recording the energy generated by the heating device in the measuring ball at the upper side and the temperature detected by the measuring ball at the lower side in real time at intervals of 5 minutes, and calculating the final interface contact thermal resistance.
Furthermore, a prefabricated groove is cut on the inner wall of the protective cover, the depth of the prefabricated groove is two thirds of the thickness of the protective cover, and the protective cover is conveniently broken by the protective ball under the action of the electric telescopic rod.
Furthermore, a reinforcing net is embedded in the protective ball and fixedly connected with the protective ball, so that the strength of the protective ball is increased, and the protective ball filled with air is not easy to break under the action of external force.
Furthermore, the inner wall of protection ball is excavated and is had a plurality of fracture grooves, it has a plurality of and the prefabricated breach that the groove matches breaks to cut on the reinforcing net for can divide into a plurality of controllable fragments when the protection ball breaks, conveniently carry out recovery work.
Furthermore, strengthen the online fixedly connected with filling tube of net, the one end that the reinforcing net was kept away from to the filling tube extends to the protection ball inboard, one portion that the filling tube is located the protection ball is mutually crisscross and is shown three-dimensional space spatial structure, the filling tube can increase the joint strength between the protection ball on the one hand, even the protection ball is cracked and is a plurality of fragments, also can unify the recovery under the traction of filling tube, on the other hand, the filling tube of packing in the protection ball can be as buffer material, reduce the protection ball in the displacement in-process in the soft mud layer by a wide margin, soft mud is through the influence to aciculiform temperature sensor to the power that the protection ball extrusion produced, make aciculiform temperature sensor not fragile.
Further, the one end that the filling pipe is located the protection ball is the elasticity rubber tube body, the elasticity rubber tube body is three-dimensional heliciform, and crisscross entanglement forms three-dimensional space spatial structure between the adjacent elasticity rubber tube body, increases the bulk strength of elasticity rubber tube body, and easily elasticity rubber tube body keeps elasticity, is difficult for leading to elasticity rubber tube body three-dimensional space spatial structure collapse under the exogenic action, is difficult for causing the guard action inefficacy of elasticity rubber tube body.
Furthermore, a filling cavity is formed in the elastic rubber hose body, capillary fibers are filled in the filling cavity, the elasticity of the elastic rubber hose body is increased, and the capability of the whole filling hose for resisting external force is increased.
Further, the one end that capillary fibre is close to the elastic rubber tube body runs through the elastic rubber tube body and extends to the outside of elastic rubber tube body to the cladding is in the outside of elastic rubber tube body, and is adjacent connect through capillary fibre's entanglement between the elastic rubber tube body, increases the intensity of the self of elastic rubber tube body on the one hand, and on the other hand increases the joint strength between the elastic rubber tube body through capillary fibre's entanglement.
Furthermore, a plurality of capillary cracks are cut on the elastic rubber tube body and penetrate through the elastic rubber tube body, so that the elastic rubber tube body can be torn along the capillary cracks when the protective ball is broken, and the needle-shaped temperature sensor is not easy to be pulled and damaged.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
this scheme will detect the main part through electric telescopic handle and measure the ball and transport the position of keeping away from the pile body, stagger the weak soil intersectional position of measuring ball and pile body cloth pile in-process damage, reduce the systematic error because of the cloth pile causes, increase the accuracy that detects.
The measuring ball and the needle-shaped temperature sensor are protected by the protection ball which is filled with air and is swelled in the process of conveying the measuring ball by the electric telescopic rod, and the measuring ball and the needle-shaped temperature sensor are not easily damaged or coated by soft mud, so that the detection result is not easily influenced.
After the measuring ball is transported to the assigned position, the sufficient air can be injected into the protecting ball, so that the protecting ball is broken, the measuring ball and the needle-shaped temperature sensor are contacted with the soft mud layer, the broken protecting ball can be kept relatively complete under the dragging action of the reinforcing net and the filling pipe, the subsequent uniform recovery is facilitated, and the additional environmental pollution is not easy to cause.
Drawings
FIG. 1 is a schematic view of the main structure of the soft soil interface thermal contact resistance test device of the present invention;
FIG. 2 is a schematic structural diagram of the test device for soft soil interface thermal contact resistance of the present invention with the protective cover removed;
FIG. 3 is a schematic side sectional view of the protective cover of the testing device for soft soil interface thermal contact resistance of the present invention;
FIG. 4 is a partial structural view of the measuring ball according to the present invention;
FIG. 5 is a schematic view of the structure at A in FIG. 4;
FIG. 6 is a schematic view of the structure at B in FIG. 5;
FIG. 7 is a schematic structural view of a fill tube of the present invention;
FIG. 8 is a schematic cross-sectional view of a fill tube of the present invention;
Fig. 9 is a schematic view of a structure for calculating heat transfer efficiency according to the present invention.
The reference numbers in the figures illustrate:
the device comprises a pile body 1, a first measuring chamber 2, a second measuring chamber 3, a protective cover 4, a prefabricated groove 5, an electric telescopic rod 6, a measuring ball 7, a needle-shaped temperature sensor 8, a protective ball 9, a breaking groove 10, a reinforcing mesh 11, a filling tube 12, an elastic rubber tube body 1201, a filling cavity 1202, capillary fibers 1203, a capillary crack 1204, a vent chamber 13, a sealing piston 14, a vent hole 15, a limiting slide rod 16 and a compression spring 17.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection can be direct connection or indirect connection through an intermediate medium, and can be communication inside the model adapting element. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
referring to fig. 1-5, a testing apparatus for determining soft soil interface thermal contact resistance comprises a pile body 1, a first measuring chamber 2 and a second measuring chamber 3 are drilled on the side wall of the pile body 1, the first measuring chamber 2 is located on the upper side of the second measuring chamber 3, electric telescopic rods 6 are fixedly connected to the side walls of the first measuring chamber 2 and the second measuring chamber 3, measuring balls 7 are fixedly connected to the other ends of the two electric telescopic rods 6, a heating device is installed in the measuring ball 7 located in the first measuring chamber 2, a plurality of needle-shaped temperature sensors 8 are fixedly connected to the outer wall of the measuring ball 7, the plurality of needle-shaped temperature sensors 8 are uniformly distributed on the outer wall of the measuring ball 7, a protective ball 9 is sleeved outside the measuring ball 7, the protective ball 9 is located outside the needle-shaped temperature sensors 8, one end of the electric telescopic rod 6 close to the measuring ball 7 penetrates through the protective ball 9 and is fixedly connected with the protective ball 9, electric telescopic handle 6 is last to be dug has plenum 13, the last ventilation through hole that has dug of plenum 13, sliding connection has with self assorted sealing piston 14 in the ventilation through hole, it has a pair of air vent 15 to dig on sealing piston 14's the lateral wall, air vent 15 runs through sealing piston 14, a pair of spacing slide bar 16 of fixedly connected with on the plenum 13 inner wall, the one end of seeing two spacing slide bar 16 and keeping away from plenum 13 inner wall all runs through sealing piston 14 and extends to sealing piston 14's downside, spacing slide bar 16's outside cover is equipped with compression spring 17, compression spring 17's both ends are respectively in plenum 13 inner wall and sealing piston 14 fixed connection.
Particularly, one end of the ventilation chamber 13, which is far away from the sealing piston 14, is communicated with the external space, and a high-pressure air pump is arranged in the ventilation chamber 13, and the high-pressure air pump can pump external air into the ventilation chamber 13, which is a known technology of a person skilled in the art, and is not described in detail in the present application, the person skilled in the art can reasonably design and install the device and the structure according to the prior art, so that the use requirements are met, meanwhile, the structure shown in fig. 1 in the scheme is only used for reference, and the sizes and the intervals of the components of the device need to be reasonably designed and produced according to the actual measurement requirements of the person skilled in the art, and are not uniform and fixed in size.
A use method of a test device for measuring soft soil interface contact thermal resistance mainly comprises the following steps:
s1, pile arrangement, wherein technicians select measurement groups and pile arrangement positions according to actual measurement requirements, and then detect whether the pile body 1 can normally work, including but not limited to whether the electric telescopic rod 6 can normally extend and shorten and whether a fixed amount of gas can be filled into the protective ball 9, and the like, and then insert the detected pile body 1 into a preset position to complete pile arrangement work, in order to increase the accuracy of the test, a plurality of measurement points can be selected in a soft soil area to be detected to detect the contact thermal resistance of a soft soil interface, and after part of data with larger difference is removed, an average value is taken to obtain a final measurement result;
S2, preparing, sending an instruction to the pile body 1 which is finished with the step S1, filling gas into the protective ball 9 to enable the protective ball 9 to be wholly bulged, then controlling the electric telescopic rod 6 to extend, using the impact force generated by the electric telescopic rod 6 to break the protective cover 4, sending the measuring ball 7 to a specified measuring position by controlling the specific extending length of the electric telescopic rod 6, when the measuring ball 7 is sent to the specified position, continuing filling the gas into the protective ball 9 until the protective ball 9 is broken, stopping filling the air, at the moment, automatically filling soft soil into the space originally existing in the protective ball 9, coating the measuring ball 7 and the needle-shaped temperature sensor 8, staggering the positions measured by the measuring ball 7 and the needle-shaped temperature sensor 8 and the contact interface damaged by the pile body 1 in the step S1, and reducing the measuring error caused by the damage of the pile-arranging process to the soft soil section;
s3, measuring interface contact thermal resistance, starting a heating device in the measuring ball 7 at the upper side, heating the temperature of soft soil where the measuring ball 7 at the upper side is located to 20 ℃ above a preset temperature, keeping the temperature for 10 minutes, then cutting off the power supply of the heating device, naturally cooling the soft soil to the preset temperature, recording the temperature of soft soil layers where the upper and lower measuring balls 7 are located, starting the heating device, keeping the temperature of the soft soil layer where the measuring ball 7 at the upper side is located at the preset temperature, simultaneously detecting the temperature change of the soft soil layer by the measuring ball 7 at the lower side, lasting for 1 hour, recording the energy generated by the heating device in the measuring ball 7 at the upper side and the real-time detected temperature of the measuring ball 7 at the lower side at intervals of 5 minutes, and calculating the final interface contact thermal resistance, wherein the energy generated by the heating device needs to be converted according to a proportion when the interface contact thermal resistance is carried out, that is, the ratio of the soil layer area of the measuring ball 7 at the lower side of the measuring ball 7 to the surface area of the measuring ball 7, which is affected by the heat emitted by the heating device in the measuring ball 7, is the above ratio, and is related to the size and the distance between the two measuring balls 7, so that a person skilled in the art can reasonably calculate the ratio according to actual conditions.
Referring to fig. 9, it is considered that the energy wave emitted from the heating device is emitted uniformly around the circumference, and the range of the energy wave affected by the measuring ball 7 on the lower side is as shown in fig. 9, so the specific value of the above ratio is the quotient of the surface area of the measuring ball 7 on the upper side in the energy wave and the whole surface area of the measuring ball 7.
Referring to fig. 3-4 and 7-8, a preformed groove 5 is cut on the inner wall of the protective cover 4, the depth of the preformed groove 5 is two thirds of the thickness of the protective cover 4, the protective cover 4 is conveniently broken by the protective ball 9 under the action of the electric telescopic rod 6, a reinforcing net 11 is embedded in the protective ball 9, the reinforcing net 11 is fixedly connected with the protective ball 9, the strength of the protective ball 9 is increased, the protective ball 9 filled with air is not easy to break under the action of external force, a plurality of breaking grooves 10 are cut on the inner wall of the protective ball 9, a plurality of prefabricated gaps matched with the breaking grooves 10 are cut on the reinforcing net 11, the protective ball 9 can be divided into a plurality of controllable fragments when broken, the recovery work is convenient, a filling pipe 12 is fixedly connected on the reinforcing net 11, one end of the filling pipe 12 far away from the reinforcing net 11 extends to the inner side of the protective ball 9, a part of the filling pipe 12 in the protective ball 9 is staggered to present a three-dimensional structure, the filling tube 12 can increase the joint strength between the protection ball 9 on the one hand, even though the protection ball 9 is cracked to be a plurality of fragments, also can unify and retrieve under the traction of filling tube 12, and on the other hand, the filling tube 12 of packing in the protection ball 9 can regard as buffer material, reduces protection ball 9 in the displacement in-process in the soft mud layer by a wide margin, and soft mud is through the influence to aciculiform temperature sensor 8 to the power that produces the extrusion of protection ball 9 for aciculiform temperature sensor 8 is not fragile.
One end of the filling pipe 12, which is positioned in the protective ball 9, is an elastic rubber hose body 1201, the elastic rubber hose body 1201 is in a three-dimensional spiral shape, adjacent elastic rubber hose bodies 1201 are interlaced and entangled to form a three-dimensional space structure, the overall strength of the elastic rubber hose body 1201 is increased, the elastic rubber hose body 1201 is easy to maintain elasticity, the three-dimensional space structure of the elastic rubber hose body 1201 is not easy to collapse under the action of external force, the protection effect of the elastic rubber hose body 1201 is not easy to lose efficacy, a filling cavity 1202 is formed in the elastic rubber hose body 1201, capillary fibers 1203 are filled in the filling cavity 1202 to increase the elasticity of the elastic rubber hose body 1201, the overall capacity of the filling pipe 12 for resisting the external force is increased, one end of the capillary fibers 1203, which is close to the elastic rubber hose body 1201, penetrates through the elastic rubber hose body 1201 and extends to the outer side of the elastic rubber hose body 1201 and is coated on the outer side of the elastic rubber hose body 1201, and the adjacent elastic rubber hose bodies are connected through entanglement of the capillary fibers 1203, on the one hand, the strength of the elastic rubber hose body 1201 is increased, on the other hand, the connection strength between the elastic rubber hose bodies 1201 is increased through entanglement of the capillary fibers 1203, a plurality of capillary cracks 1204 are dug on the elastic rubber hose body 1201, and the plurality of capillary cracks 1204 penetrate through the elastic rubber hose body 1201, so that the elastic rubber hose body 1201 can be torn along the capillary cracks 1204 when the protective ball 9 is broken, and the needle-shaped temperature sensor 8 is not easy to be pulled and damaged.
The scheme transports the measuring ball 7 of the detecting main body to a position far away from the pile body 1 through the electric telescopic rod 6, staggers the position of a cross section between the measuring ball 7 and soft soil damaged in the pile arrangement process of the pile body 1, reduces system errors caused by pile arrangement, increases the detection accuracy, protects the measuring ball 7 and the needle-shaped temperature sensor 8 through the protection ball 9 which is filled with air and swells in the process of transporting the measuring ball 7 through the electric telescopic rod 6, is not easily damaged or coated by soft mud, does not easily influence the detection result, can lead the protection ball 9 to be broken by injecting sufficient air into the protection ball 9 after the measuring ball 7 is transported to a designated position, realizes that the measuring ball 7 and the needle-shaped temperature sensor 8 are contacted with the soft mud layer, and the broken protection ball 9 can keep relatively complete under the traction action of the reinforcing net 11 and the filling pipe 12, is convenient for subsequent unified recovery, is not easy to cause additional environmental pollution.
The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should also be able to cover the technical scope of the present invention by the equivalent or modified embodiments and the modified concepts of the present invention.
Claims (10)
1. The utility model provides a survey soft soil interface thermal contact resistance's test device, includes pile body (1), its characterized in that: the pile comprises a pile body (1), and is characterized in that a first measuring chamber (2) and a second measuring chamber (3) are drilled on the side wall of the pile body (1), the first measuring chamber (2) is positioned at the upper side of the second measuring chamber (3), protective covers (4) are arranged at the opening parts of the first measuring chamber (2) and the second measuring chamber (3), electric telescopic rods (6) are fixedly connected to the side walls of the first measuring chamber (2) and the second measuring chamber (3), measuring balls (7) are fixedly connected to the other ends of the two electric telescopic rods (6), a heating device is arranged in each measuring ball (7) positioned in the first measuring chamber (2), a plurality of needle-shaped temperature sensors (8) are fixedly connected to the outer wall of each measuring ball (7), the plurality of needle-shaped temperature sensors (8) are uniformly distributed on the outer wall of each measuring ball (7), and a protective ball (9) is sleeved outside each measuring ball (7), the utility model discloses a safety protection device for a needle-shaped temperature sensor, including protection ball (9), electric telescopic handle (6), breather chamber (13), ventilation through-hole, sliding connection has self assorted sealing piston (14) in the ventilation through-hole, a pair of air vent (15) have been dug on the lateral wall of sealing piston (14), air vent (15) run through sealing piston (14), a pair of spacing slide bar (16) of fixedly connected with on breather chamber (13) the inner wall, two the one end that breather chamber (13) inner wall was kept away from in spacing slide bar (16) all runs through sealing piston (14) and extends to the downside of sealing piston (14), the outside cover of spacing slide bar (16) is equipped with compression spring (17), two ends of the compression spring (17) are respectively fixedly connected with the inner wall of the breather chamber (13) and the sealing piston (14);
One end of the ventilation chamber (13) far away from the sealing piston (14) is communicated with the external space, and a high-pressure air pump is arranged in the ventilation chamber (13) and pumps external air into the ventilation chamber (13);
during testing, the pile body (1) is inserted into a preset position through detection to complete pile arrangement, gas is filled into the protective ball (9), the protective ball (9) is enabled to be wholly bulged, then the electric telescopic rod (6) is controlled to extend, the protective cover (4) is knocked down by using the impact force generated by the electric telescopic rod (6), the measuring ball (7) is sent to a specified measuring position by controlling the specific extending length of the electric telescopic rod (6), when the measuring ball (7) is sent to the specified position, the gas is continuously filled into the protective ball (9) until the protective ball (9) is broken, air filling is stopped, soft soil can be automatically filled into the space originally existing in the protective ball (9), the measuring ball (7) and the needle-shaped temperature sensor (8) are coated, the positions measured by the measuring ball (7) and the needle-shaped temperature sensor (8) are staggered with the contact interface damaged by the pile body (1) in the pile arrangement process, and the measurement error caused by the damage of the pile arrangement process to the soft soil section is reduced.
2. The test device for measuring the contact thermal resistance of the soft soil interface according to claim 1, wherein: the inner wall of the protective cover (4) is provided with a prefabricated groove (5), and the depth of the prefabricated groove (5) is two thirds of the thickness of the protective cover (4).
3. The test device for measuring the contact thermal resistance of the soft soil interface according to claim 1, wherein: a reinforcing net (11) is embedded in the protective ball (9), and the reinforcing net (11) is fixedly connected with the protective ball (9).
4. A test device for measuring soft soil interface thermal contact resistance according to claim 3, characterized in that: the inner wall of the protective ball (9) is provided with a plurality of breaking grooves (10), and the reinforcing net (11) is provided with a plurality of prefabricated gaps matched with the breaking grooves (10).
5. A test device for measuring soft soil interface thermal contact resistance according to claim 3, characterized in that: fixedly connected with filling tube (12) on strengthening net (11), the one end that strengthening net (11) was kept away from to filling tube (12) extends to protection ball (9) inboard, one end that filling tube (12) are located protection ball (9) is crisscross each other and is shown three-dimensional space spatial structure.
6. A test device for measuring soft soil interface thermal contact resistance according to claim 5, characterized in that: the packing tube (12) is located one end of the protection ball (9) and is an elastic rubber tube body (1201), the elastic rubber tube body (1201) is in a three-dimensional spiral shape, and adjacent elastic rubber tube bodies (1201) are interlaced and entangled to form a three-dimensional space three-dimensional structure.
7. The test device for measuring the contact thermal resistance of the soft soil interface according to claim 6, wherein: a filling cavity (1202) is formed in the elastic rubber tube body (1201) in a chiseled mode, and capillary fibers (1203) are filled in the filling cavity (1202).
8. A test device for determining soft soil interface thermal contact resistance according to claim 7, wherein: one end, close to the elastic rubber tube body (1201), of the capillary fiber (1203) penetrates through the elastic rubber tube body (1201), extends to the outer side of the elastic rubber tube body (1201), and is wrapped on the outer side of the elastic rubber tube body (1201), and the adjacent elastic rubber tube bodies (1201) are connected through entanglement of the capillary fiber (1203).
9. The test device for measuring the contact thermal resistance of the soft soil interface according to claim 6, wherein: a plurality of hairline cracks (1204) are cut on the elastic rubber tube body (1201), and the hairline cracks (1204) penetrate through the elastic rubber tube body (1201).
10. The use method of the test device for determining the soft soil interface contact thermal resistance according to claim 1 comprises the following steps: the method is characterized in that: the method mainly comprises the following steps:
s1, pile arrangement, wherein technicians select measurement groups and pile arrangement positions according to actual measurement requirements, and then detect whether the pile body (1) can normally work, including but not limited to whether the electric telescopic rod (6) can normally extend and shorten and whether a fixed amount of gas can be filled into the protective ball (9), and then insert the detected pile body (1) into a preset position to complete pile arrangement;
s2, preparing, sending an instruction to the pile body (1) which is finished with the step S1, filling gas into the protective ball (9), enabling the protective ball (9) to be wholly bulged, then controlling the electric telescopic rod (6) to extend, using the impulsive force generated by the electric telescopic rod (6) to crash the protective cover (4), sending the measuring ball (7) to a specified measuring position by controlling the specific extending length of the electric telescopic rod (6), and continuing filling the gas into the protective ball (9) when the measuring ball (7) is sent to the specified position until the protective ball (9) is broken, stopping filling air, and at the moment, filling soft soil into the originally existing space of the protective ball (9) automatically, and coating the measuring ball (7) and the needle-shaped temperature sensor (8);
S3, measuring interface contact thermal resistance, starting a heating device in the measuring ball (7) positioned at the upper side, heating the temperature of the soft soil where the measuring ball (7) positioned at the upper side is positioned to 20 ℃ above the preset temperature, keeping the temperature for 10 minutes, then cutting off the power supply of the heating device, naturally cooling the soft soil to the preset temperature, recording the temperature of the soft soil layers where the upper and lower measuring balls (7) are positioned, starting the heating device, keeping the temperature of the soft soil layer where the measuring ball (7) positioned at the upper side is positioned at the preset temperature, simultaneously detecting the temperature change of the soft soil layer by the measuring ball (7) positioned at the lower side, continuing for 1 hour, recording the energy generated by the heating device in the measuring ball (7) positioned at the upper side and the real-time detected temperature of the measuring ball (7) positioned at the lower side every 5 minutes, and calculating the final interface contact thermal resistance.
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