CN114354434B - Roadbed material dry-wet cycle test device and test method - Google Patents
Roadbed material dry-wet cycle test device and test method Download PDFInfo
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- CN114354434B CN114354434B CN202111627842.6A CN202111627842A CN114354434B CN 114354434 B CN114354434 B CN 114354434B CN 202111627842 A CN202111627842 A CN 202111627842A CN 114354434 B CN114354434 B CN 114354434B
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- 238000012360 testing method Methods 0.000 title claims abstract description 109
- 239000000463 material Substances 0.000 title claims abstract description 48
- 238000010998 test method Methods 0.000 title claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 158
- 238000001035 drying Methods 0.000 claims abstract description 28
- 238000007789 sealing Methods 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 238000005303 weighing Methods 0.000 claims abstract description 15
- 238000011068 loading method Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 10
- 230000003014 reinforcing effect Effects 0.000 claims description 10
- 238000010521 absorption reaction Methods 0.000 claims description 8
- 238000005485 electric heating Methods 0.000 claims description 8
- 238000011049 filling Methods 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 238000011056 performance test Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
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Abstract
The invention discloses a roadbed material dry-wet cycle test device, which comprises: the side wall of the test box is provided with an openable door plate, and the bottom wall of the test box is provided with a moving hole; the sample carrying table is movably inserted in the moving hole, and the two sides of the sample carrying table are provided with downward first inclined surfaces; the sample tank is detachably arranged on the sample carrying table, a sample is arranged in the sample tank, the sample tank is communicated with a vertical water inlet pipe, the bottom of the side wall of the sample tank is communicated with a drain pipe, and an elastic sealing plug is detachably arranged at the outlet of the drain pipe; a liquid supply assembly for adding water into the sample tank through a water inlet pipe; a drying assembly disposed on the test chamber for accelerating drying of the sample; and a weighing scale arranged below the sample carrying platform outside the test box and used for weighing the total weight of the sample tank and the sample carrying platform. The invention has accurate water content of the monitored sample and good test effect.
Description
Technical Field
The invention relates to the technical field of test equipment, in particular to a roadbed material dry-wet cycle test device and a test method.
Background
In the use process of the road subgrade, the road subgrade is repeatedly acted by the load of the vehicle and comprehensively acted by external environment factors, and the internal water content of the road subgrade changes repeatedly in seasons. Research shows that under the action of dry and wet circulation conditions, the internal structure of the roadbed filling material is irreversibly changed, so that the strength and rigidity of the roadbed filling material are reduced, and even the roadbed is unstable. In order to study the change rule of physical and mechanical characteristics of roadbed materials under the action of dry and wet circulation conditions, at present, students at home and abroad mainly study through an indoor dry and wet circulation test method, in the existing dry and wet circulation test, the water content of a road material test piece is generally judged through the soaking time and the drying time, and the mode leads to a larger error in determining the water content of the road material test piece in the dry and wet test.
Disclosure of Invention
It is an object of the present invention to solve at least the above problems and to provide at least the advantages to be described later.
The invention also aims to provide the roadbed material dry-wet cycle test device, which achieves the aim of accurately detecting the water content of the sample in real time by arranging a metering scale to indirectly weigh the weight of the sample corresponding to the water content of the sample in real time in the sample drying process.
To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided a dry and wet cycle test apparatus for roadbed materials, comprising:
the side wall of the test box is provided with an openable door plate, and the bottom wall of the test box is provided with a moving hole;
the sample carrying platform is movably inserted into the moving hole, and the two sides of the sample carrying platform are provided with downward first inclined surfaces;
the sample tank is detachably arranged on the sample carrying table, a sample is arranged in the sample tank, the sample tank is communicated with a vertical water inlet pipe, the bottom of the side wall of the sample tank is communicated with a drain pipe, and an elastic sealing plug is detachably arranged at the outlet of the drain pipe;
a liquid supply assembly for adding water into the sample tank through the water inlet pipe;
a drying assembly disposed on the test chamber for accelerating drying of the sample;
and a weighing scale arranged outside the test box and below the sample loading table for weighing the total weight of the sample tank and the sample loading table.
Preferably, in the roadbed material dry-wet cycle test device, the device further comprises a support component, which comprises:
the moving blocks are in a pair and are respectively positioned at two sides of the sample carrying table, and the opposite surfaces of the moving blocks are respectively provided with a second inclined surface which is respectively in sliding tangency with the two first inclined surfaces;
the first electric telescopic rod is arranged on the side wall of the test box, the free end of the first electric telescopic rod is connected with the moving block and drives the moving block to slide on the inner bottom plate of the test box, so that the first inclined surface and the second inclined surface are in sliding tangency.
Preferably, in the roadbed material dry-wet cycle test device, a vertical positioning sleeve is arranged right above the sample groove in a penetrating manner on the top wall of the test box, a vertical moving rod is arranged in the positioning sleeve in a moving manner, and a pressure block is arranged at the bottom end of the moving rod.
Preferably, in the roadbed material dry-wet cycle test device, a support frame is arranged at the bottom in the sample tank, a sample loading tank is arranged on the support frame, a water storage space is reserved between the side wall of the sample loading tank and the side wall of the sample tank, the side wall and the bottom wall of the sample loading tank all comprise an inner wall, a filter layer and an outer wall from inside to outside, and liquid through holes are formed in the inner wall and the outer wall in a staggered mode.
Preferably, in the roadbed material dry-wet cycle test device, the notch at the top of the sample groove is higher than the notch at the top of the sample groove.
Preferably, in the roadbed material dry-wet cycle test device, the liquid supply assembly comprises:
a water tank located outside the test chamber;
the inlet end of the water pump is communicated with the water tank through a water inlet pipe, the outlet end of the water pump is connected with one end of a water outlet pipe, and the other end of the water outlet pipe is opposite to the inlet end of the water inlet pipe and conveys water into the water inlet pipe.
Preferably, in the roadbed material dry-wet circulation test device, an inclined water collecting plate is arranged on the inner side wall of the test box, the top end of the water collecting plate extends to the lower portion of the drain pipe, connecting plates are arranged on two sides of the water collecting plate and are surrounded by the side wall of the test box to form a water collecting tank, and the bottom of the water collecting tank is communicated with the water tank through a connecting pipe.
Preferably, in the roadbed material dry-wet cycle test device, the bottom of the side wall of the sample tank is communicated with the bottom end of a vertical air inlet pipe;
the drying assembly includes:
the electric heating rods are in a plurality of groups and are uniformly arranged on the inner side wall of the test box;
the ventilating fans are uniformly arranged on the side wall of the test box;
the air heater is arranged outside the test box, the air outlet end of the air heater is connected with one end of an air delivery pipe,
the other end of the gas transmission pipe is opposite to the inlet at the top end of the gas inlet pipe and used for conveying hot gas into the gas inlet pipe.
Preferably, in the roadbed material dry-wet cycle test device, a second electric telescopic rod is arranged on the side wall of the test box, and the moving end of the second electric telescopic rod is connected with the elastic sealing plug.
The invention also provides a roadbed material dry-wet cycle test method, which comprises the following steps:
firstly, weighing a dry sample, and recording the mass of the dry sample as M0;
step two, opening an openable door plate, taking out a sample groove, placing a dried sample in the sample groove, placing the sample groove on a sample carrying table, moving the sample carrying table to enable the sample carrying table to rest on a metering scale, and recording the metering scale reading number as M1;
step three, moving the sample carrying table upwards until the sample carrying table is separated from the metering scale, sealing the drain pipe by using an elastic sealing plug, then filling water into the sample tank by using the liquid supply assembly through the water inlet pipe until the sample is completely immersed, and standing until the sample is saturated in water absorption;
step four, taking out the elastic sealing plug, discharging water in the sample tank through the drain pipe, simultaneously, transferring the sample platform downwards until the sample platform contacts with the metering scale, then enabling the sample platform to be placed on the metering scale, closing the openable door plate, and drying the sample by using the drying component until the reading M2 of the metering scale is a value corresponding to the required water content;
step five, repeating the processes of the step three and the step four until the dry and wet cycle times required by the test are reached;
and step six, opening the openable door plate, taking out the sample groove, taking out the sample from the sample groove, and performing other performance tests on the sample.
The invention at least comprises the following beneficial effects: in the invention, the water loss/water absorption of the sample can be monitored constantly through the metering scale by always arranging the sample on the metering scale together with the sample tank and the sample carrying table in the drying and gradual water loss process, so that the water content is calculated; according to the invention, the metering scale is positioned at the outer side of the test box, so that the influence of high temperature in the test box in the sample drying process can be effectively avoided, and the weighing reading is more accurate. The invention does not need to manually and repeatedly lift and move the sample, saves manpower and has high test efficiency.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic diagram of the front view internal structure of a roadbed material dry-wet cycle test device in the invention;
FIG. 2 is a schematic diagram showing the side view of the internal structure of the dry-wet cycle test device for road base materials in the invention;
FIG. 3 is a schematic diagram showing a cross-sectional front view of a sample cell according to the present invention;
FIG. 4 is a schematic top view of a sample cell according to the present invention;
the device comprises a 1-movable block, a 2-first electric telescopic rod, a 3-ventilating fan, a 4-electric heating rod, a 5-air inlet pipe, a 6-test box, a 7-hot air blower, an 8-air conveying pipe, a 9-sample tank, a 10-positioning sleeve, a 11-movable rod, a 12-pressure block, a 13-water outlet pipe, a 14-water pump, a 15-water inlet pipe, a 16-sample carrying table, a 17-weighing scale, a 18-movable hole, a 19-water tank, a 20-connecting pipe, a 21-water collecting plate, a 22-connecting plate, a 23-second electric telescopic rod, a 24-elastic sealing plug, a 25-water outlet pipe, a 26-outer wall, a 27-filtering layer, a 28-inner wall, a 29-liquid through hole and a 30-supporting frame.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
It will be understood that terms, such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
It should be noted that the experimental methods described in the following embodiments, unless otherwise specified, are all conventional methods, and the reagents and materials, unless otherwise specified, are all commercially available; in the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "disposed" are to be construed broadly, and may be fixedly connected, disposed, or detachably connected, disposed, or integrally connected, disposed, for example. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. The terms "transverse," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used for convenience in describing and simplifying the description of the present invention based on the orientation or positional relationship shown in the drawings, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present invention.
In one technical scheme, as shown in fig. 1, 2, 3 and 4, the invention provides a roadbed material dry-wet cycle test device, which comprises:
the side wall of the test box 6 is provided with an openable door plate, and the bottom wall of the test box is provided with a moving hole 18;
a sample carrying table 16 movably inserted in the moving hole 18, wherein both sides of the sample carrying table 16 are provided with downward first inclined surfaces;
the sample tank 9 is detachably arranged on the sample carrying table 16, a sample is arranged in the sample tank 9, the sample tank 9 is communicated with a vertical water inlet pipe 15, the bottom of the side wall of the sample tank 9 is communicated with a drain pipe 25, and an elastic sealing plug 24 is detachably arranged at the outlet of the drain pipe 25;
a liquid supply unit for supplying water to the sample tank 9 through the water inlet pipe 15;
a drying assembly disposed on the test chamber 6 for accelerating the drying of the test sample;
a weighing scale 17 is provided outside the test chamber 6 below the sample stage 16 for weighing the total weight of the sample cell 9 and the sample stage 16.
The roadbed material dry-wet circulation test device provided by the technical scheme comprises a test box 6, a sample carrying table 16, a sample groove 9, a liquid supply assembly, a drying assembly and a metering scale 17, wherein an openable door plate is arranged on the side wall of the test box 6, the operation of internal equipment of the test box 6 is facilitated, a supporting leg is arranged at the bottom of the test box 6, a moving hole 18 is formed in the bottom wall of the test box 6, the sample carrying table 16 is inserted in the moving hole 18 and can move up and down, the sample carrying table 16 is an I-shaped structure consisting of two transverse plates and a vertical plate, a first reinforcing block with a right triangle cross section is arranged between the upper transverse plate and the vertical plate, a first inclined surface is formed by the inclined surface of the first reinforcing block downwards, a second reinforcing block with a right triangle cross section is arranged between the lower transverse plate and the vertical plate, the inclined surface of the second reinforcing block faces upwards, the I-shaped sample carrying table increases the contact area above the test sample carrying table to stably support objects with larger areas, the reinforcing block increases the stability of the structure of the sample carrying table 16, the sample carrying groove 9 provided with a plurality of samples can be detached, if the sample carrying table 16 is provided with the sample carrying plates with the right triangle cross section and the right triangle is provided with the right triangle and the first reinforcing block and the sample carrying plate, and the sample carrying table is clamped between the limit plates and the limit plates; the sample tank 9 is communicated with a vertical water inlet pipe 15, a liquid supply component is used for adding water into the sample tank 9 through the water inlet pipe 15, the height of the water inlet pipe 15 is larger than that of the sample tank 9 so as to ensure that the sample tank 9 can be fully filled with water, a water drain pipe 25 for supplying and draining water is communicated with the bottom of the side wall of the sample tank 9, a filter screen is arranged at the joint of the sample tank and the water drain pipe, the sample is prevented from running off along with water flow during draining, an elastic sealing plug 24 is detachably arranged at the outlet of the water drain pipe 25, the elastic sealing plug can be a rubber plug, a metering scale 17 is arranged below a sample carrying table 16 outside a test box 6 and can be contacted with or separated from the sample carrying table 16, the metering scale 17 can weigh the weight of the sample carrying table 16 and the sample tank 9 above the sample carrying table 16 under the condition that the sample carrying table 16 is not supported, a drying component is arranged on the test box 6 so as to accelerate the drying of the sample, a limit groove can be further arranged on the metering scale 17, and the bottom of the sample carrying table 17 is blocked in the limit groove when the sample carrying table 16 is contacted with the metering scale 17 to weigh, and the sample carrying table 16 is prevented from shaking and shifting.
The application method of the roadbed material dry-wet cycle test device provided by the technical scheme comprises the following steps: the openable door plate is opened initially, the sample tank 9 is taken out, a sample is placed in the sample tank 9, then the sample tank 9 is placed back on the sample carrying platform 16, the sample carrying platform 16 is moved down, the sample carrying platform 16 and the sample tank 9 are placed on the metering scale 17 at the same time, the total weight of the sample carrying platform 16, the sample tank 9 and the sample can be weighed, then the sample carrying platform 16 is moved up, the total weight of the sample is separated from the metering scale 17, the outlet of the drain pipe 25 is plugged by the elastic sealing plug 24, the water is added into the sample tank 9 through the water inlet pipe 15 by the liquid supply component so as to enable the sample to absorb water, after the water absorption is completed, the outlet of the drain pipe 25 is opened, the sample carrying platform 16 is moved down until the sample tank is placed on the metering scale 17, after the water in the sample tank is drained, the drying component is started to dry the sample, and the total weight change of the sample carrying platform 16, the sample tank 9 and the sample is monitored constantly through the reading of the metering scale 17 so as to determine the water absorption amount of the sample.
The invention at least comprises the following beneficial effects: in the invention, the water loss/water absorption of the sample can be monitored constantly through the metering scale by always arranging the sample on the metering scale together with the sample tank and the sample carrying table in the drying and gradual water loss process, so that the water content is calculated; according to the invention, the metering scale is positioned at the outer side of the test box, so that the influence of high temperature in the test box in the sample drying process can be effectively avoided, and the weighing reading is more accurate.
In another technical scheme, as shown in fig. 1, in the roadbed material dry-wet cycle test apparatus, further comprises a support component, which includes:
a pair of moving blocks 1, which are respectively positioned at two sides of the sample carrying table 16, wherein the opposite surfaces of the pair of moving blocks 1 are respectively provided with a second inclined surface which is respectively in sliding tangent with the two first inclined surfaces;
the first electric telescopic rod 2 is arranged on the side wall of the test box 6, the free end of the first electric telescopic rod is connected with the moving block 1, and the moving block 1 is driven to slide on the inner bottom plate of the test box 6, so that the first inclined surface and the second inclined surface are in sliding tangency. Starting a first electric telescopic rod, wherein the first electric telescopic rod stretches and drives the moving block to move, when the moving block moves in the opposite direction, the first inclined surface slides upwards along the second inclined surface in an inclined way, so that the sample carrying table moves upwards, and when the moving block moves in the opposite direction, the first inclined surface slides downwards along the second inclined surface in an inclined way, so that the sample carrying table moves downwards; the two moving blocks move oppositely or back to realize the up-and-down movement of the sample carrying platform.
In another technical scheme, as shown in fig. 1, in the roadbed material dry-wet circulation test device, a vertical positioning sleeve 10 is arranged right above the sample tank 9 in a penetrating manner on the top wall of the test box 6, a vertical moving rod 11 is arranged in the positioning sleeve 10 in a moving manner, and a pressure block 12 is arranged at the bottom end of the moving rod 11. The movable rod is a threaded rod, the inner wall of the positioning sleeve is provided with an internal thread matched with the external thread on the threaded rod, and the movable rod moves up and down in the positioning sleeve through the matching of the external thread and the internal thread; the threaded rod moves downwards to push the pressure block to move downwards, so as to apply pressure to the sample in the sample tank, and simulate the pressure applied by the vehicle to the roadbed material under the road condition; the top end of the threaded rod is provided with a horizontal auxiliary rotating rod, so that the rotating movement of the moving rod is facilitated.
In another technical scheme, as shown in fig. 3 and 4, in the roadbed material dry-wet circulation test device, a support frame 30 is arranged at the bottom in the sample tank 9, a sample loading tank is arranged on the support frame 30, a water storage space is reserved between the side wall of the sample loading tank and the side wall of the sample tank 9, the side wall and the bottom wall of the sample loading tank all comprise an inner wall 28, a filter layer 27 and an outer wall 26 from inside to outside, and liquid through holes 29 are formed in the inner wall 28 and the outer wall 26 in a staggered manner. The drain pipe is communicated with the water storage space, when the sample is saturated by water absorption, water in the sample loading groove sequentially passes through the liquid through holes on the inner wall of the sample loading groove, the filter layer and the liquid through holes on the outer wall of the sample loading groove to flow into the water storage space, and then is discharged through the drain pipe; the filter layer is arranged on the wall of the sample loading groove to prevent the sample from losing in the drainage process; the filter layer can be filter sponge, the inner wall of the pore diameter of the filter sponge is completely broken, water can directly permeate from the pore according to the force, and the water cannot be absorbed by the filter sponge, so that the filter sponge can not only filter and prevent the sample from losing, but also not absorb water.
In another technical scheme, as shown in fig. 3, in the roadbed material dry-wet cycle test device, the notch at the top of the sample tank 9 is higher than the notch at the top of the sample loading tank. The water is allowed to fully submerge the sample loading well within the sample well to ensure complete submersion of the sample.
In another technical scheme, as shown in fig. 1 and 2, in the roadbed material dry-wet cycle test apparatus, the liquid supply assembly comprises:
a water tank 19 located outside the test chamber 6;
the inlet end of the water pump 14 is communicated with the water tank 19 through a water inlet pipe, the outlet end of the water pump is connected with one end of a water outlet pipe 13, and the other end of the water outlet pipe 13 is opposite to the inlet end of the water inlet pipe 15 and is used for conveying water into the water inlet pipe 15. The size of the inlet of the water inlet pipe is larger than that of the outlet at the other end of the water outlet pipe, and the inlet of the water inlet pipe is vertically opposite to the outlet at the other end of the water outlet pipe, so that the water pump pumps the water in the water tank into the water outlet pipe, and then flows into the water inlet pipe and flows to the water tank; the inlet of the water inlet pipe is higher than the notch of the sample tank so as to prevent water in the sample tank from flowing out of the water inlet pipe.
In another technical scheme, as shown in fig. 2 and 4, in the roadbed material dry-wet circulation test device, an inclined water collecting plate 21 is arranged on the inner side wall of the test box 6, the top end of the water collecting plate 21 extends to the lower portion of the drain pipe 25, connecting plates 22 are arranged on two sides of the water collecting plate 21 and are surrounded with the side wall of the test box 6 to form a water collecting tank, and the bottom of the water collecting tank is communicated with the water tank 19 through a connecting pipe 20. The water collecting plate is used for receiving water flowing out of the drain pipe, and the water flows to the water tank through the connecting pipe after entering the water collecting tank, so that the water can be reused.
In another technical scheme, as shown in fig. 1, in the roadbed material dry-wet cycle test device, the bottom of the side wall of the sample tank 9 is communicated with the bottom end of a vertical air inlet pipe;
the drying assembly includes:
the electric heating rods 4 are in a plurality of groups, and the electric heating rods 4 are uniformly arranged on the inner side wall of the test box 6;
a plurality of ventilation fans 3, wherein the ventilation fans 3 are uniformly arranged on the side wall of the test box 6;
the air heater 7 is arranged outside the test box 6, the air outlet end of the air heater 7 is connected with one end of an air pipe 8, and the other end of the air pipe 8 is opposite to the inlet at the top end of the air inlet pipe 5 and conveys hot air into the air inlet pipe 5.
The size of the inlet at the top end of the air inlet pipe is larger than the size of the outlet of the air delivery pipe, and the inlet of the air inlet pipe is vertically opposite to the outlet of the air delivery pipe, so that hot air enters the air inlet pipe through the air delivery pipe and then enters the sample tank, and the hot air entering the sample tank penetrates into the sample tank from multiple directions through the liquid through holes, so that the drying speed of the sample is accelerated; the inlet at the top end of the air inlet pipe is higher than the notch of the sample tank so as to prevent water in the sample tank from flowing out of the air inlet pipe.
In another technical scheme, as shown in fig. 2, in the roadbed material dry-wet cycle test device, a second electric telescopic rod 23 is arranged on the side wall of the test chamber 6, and the moving end of the second electric telescopic rod 23 is connected with the elastic sealing plug 24. When the sample carrying platform moves to the highest position, the second electric telescopic rod stretches or contracts to drive the elastic sealing plug to move so as to plug or open the water outlet of the drain pipe, and labor is saved.
The first electric telescopic rod, the second electric telescopic rod, the electric heating rod, the ventilating fan, the air heater and the water pump are all connected with a power supply through electric connecting wires.
In another technical scheme, the invention also provides a roadbed material dry-wet cycle test method, which comprises the following steps:
firstly, weighing a dry sample, and recording the mass of the dry sample as M0;
step two, opening an openable door plate, taking out a sample groove, placing a dried sample in the sample groove, placing the sample groove on a sample carrying table, moving the sample carrying table to enable the sample carrying table to rest on a metering scale, and recording the metering scale reading number as M1;
step three, moving the sample carrying table upwards until the sample carrying table is separated from the metering scale, sealing the drain pipe by using an elastic sealing plug, then filling water into the sample tank by using the liquid supply assembly through the water inlet pipe until the sample is completely immersed, and standing until the sample is saturated in water absorption;
step four, taking out the elastic sealing plug, discharging water in the sample tank through the drain pipe, simultaneously, transferring the sample platform downwards until the sample platform contacts with the metering scale, then enabling the sample platform to be placed on the metering scale, closing the openable door plate, and drying the sample by using the drying component until the reading M2 of the metering scale is a value corresponding to the required water content;
step five, repeating the processes of the step three and the step four until the dry and wet cycle times required by the test are reached;
and step six, opening the openable door plate, taking out the sample groove, taking out the sample from the sample groove, and performing other performance tests on the sample.
The formula is:the value of M2 is calculated. The method can accurately control the water content of the sample in the dry-wet cycle process.
Examples
The roadbed material dry-wet cycle test method based on the roadbed material dry-wet cycle test device comprises the following steps:
firstly, weighing a dry sample to be measured, and recording the mass of the dry sample as M0;
step two, opening an openable door plate of the device, taking out a sample groove, putting a dry sample into the sample groove, putting the sample groove back onto a sample carrying table, starting a first electric telescopic rod, enabling two moving blocks to move back until the moving blocks are separated from the sample carrying table, closing the first electric telescopic rod, enabling the sample carrying table to move downwards and be placed on a measuring scale, and recording the reading number of the measuring scale as M1;
starting a first electric telescopic rod, enabling the two moving blocks to move in opposite directions, enabling the first inclined surface to slide upwards along the second inclined surface, enabling the sample carrying platform to move upwards until the sample carrying platform is separated from the metering scale, closing the first electric telescopic rod, starting the second electric telescopic rod, driving the elastic sealing plug to move to a water outlet of the water draining pipe and seal the water outlet, closing the second electric telescopic rod, then starting the water pump, pumping water in the water tank into the sample tank through the water inlet pipe, the water outlet pipe and the water inlet pipe until the water is completely immersed in the sample tank, closing the water pump, enabling the sample to stand, simultaneously rotating the moving rod to enable the moving rod to move downwards along the positioning sleeve until the pressure block contacts with the sample to enable the pressure block to apply pressure to the sample, upwards moving the moving rod until the pressure block is separated from the sample after a certain period of pressure is applied, and repeating the pressure applying process until the sample is saturated after a certain period of time;
and fourthly, starting a second electric telescopic rod to enable the elastic sealing plug to be separated from the drain pipe, draining water in the sample tank, closing the second electric telescopic rod, simultaneously starting the first electric telescopic rod, enabling the two moving blocks to move back until the moving blocks are separated from the sample carrying table, closing the first electric telescopic rod, enabling the sample carrying table to move downwards and be placed on the metering scale, closing the openable door plate, starting the electric heating rod, the ventilating fan and the air heater, enabling the temperature rise and ventilation in the test box to dry the sample, simultaneously observing the reading M2 of the metering scale to be a weight value corresponding to the required water content, and closing the electric heating rod, the ventilating fan and the air heater.
Step five, repeating the processes of the step three and the step four until the dry and wet cycle times required by the test are reached;
and step six, opening the openable door plate, taking out the sample groove, taking out the sample from the sample groove, and performing other performance tests on the sample.
The formula in this embodiment is:get->
The number of equipment and the scale of processing described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be readily apparent to those skilled in the art.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown, it is well suited to various fields of use for which the invention is suited, and further modifications may be readily made by one skilled in the art, and the invention is therefore not to be limited to the particular details and examples shown and described herein, without departing from the general concepts defined by the claims and the equivalents thereof.
Claims (9)
1. Roadbed material dry-wet cycle test device, its characterized in that includes:
the side wall of the test box is provided with an openable door plate, and the bottom wall of the test box is provided with a moving hole;
the sample carrying platform is movably inserted into the moving hole, and the two sides of the sample carrying platform are provided with downward first inclined surfaces; the sample carrying table is of an I-shaped structure formed by two transverse plates and a vertical plate, a first reinforcing block with a right-angled triangle cross section is arranged between the upper transverse plate and the vertical plate, the inclined surface of the first reinforcing block faces downwards to form the first inclined surface, a second reinforcing block with a right-angled triangle cross section is arranged between the lower transverse plate and the vertical plate, the inclined surface of the second reinforcing block faces upwards, and the vertical plate is movably inserted in the moving hole;
the sample tank is detachably arranged on the sample carrying table, a sample is arranged in the sample tank, the sample tank is communicated with a vertical water inlet pipe, the bottom of the side wall of the sample tank is communicated with a drain pipe, and an elastic sealing plug is detachably arranged at the outlet of the drain pipe;
a liquid supply assembly for adding water into the sample tank through the water inlet pipe;
a drying assembly disposed on the test chamber for accelerating drying of the sample;
a weighing scale disposed outside the test chamber below the sample stage for weighing the total weight of the sample cell and the sample stage;
a support assembly, comprising:
the moving blocks are in a pair and are respectively positioned at two sides of the sample carrying table, and the opposite surfaces of the moving blocks are respectively provided with a second inclined surface which is respectively in sliding tangency with the two first inclined surfaces;
the first electric telescopic rod is arranged on the side wall of the test box, the free end of the first electric telescopic rod is connected with the moving block and drives the moving block to slide on the inner bottom plate of the test box, so that the first inclined surface and the second inclined surface are in sliding tangency.
2. The roadbed material dry-wet cycle test device according to claim 1, wherein a vertical positioning sleeve is arranged right above the sample tank and on the top wall of the test box in a penetrating manner, a vertical moving rod is arranged in the positioning sleeve in a moving manner, and a pressure block is arranged at the bottom end of the moving rod.
3. The roadbed material dry-wet cycle test device according to claim 1, wherein a support frame is arranged at the bottom in the sample tank, a sample loading tank is arranged on the support frame, a water storage space is reserved between the side wall of the sample loading tank and the side wall of the sample tank, the side wall and the bottom wall of the sample loading tank respectively comprise an inner wall, a filter layer and an outer wall from inside to outside, and liquid through holes are formed in the inner wall and the outer wall in a staggered manner.
4. The dry and wet cycle test device for roadbed materials according to claim 3, wherein the notch at the top of the sample tank is higher than the notch at the top of the sample tank.
5. The dry and wet cycle test apparatus for roadbed materials according to claim 1, wherein the liquid supply assembly comprises:
a water tank located outside the test chamber;
the inlet end of the water pump is communicated with the water tank through a water inlet pipe, the outlet end of the water pump is connected with one end of a water outlet pipe, and the other end of the water outlet pipe is opposite to the inlet end of the water inlet pipe and conveys water into the water inlet pipe.
6. The dry and wet cycle test device for roadbed materials according to claim 5, wherein an inclined water collecting plate is arranged on the inner side wall of the test box, the top end of the water collecting plate extends to the lower portion of the drain pipe, connecting plates are arranged on two sides of the water collecting plate and are surrounded with the side wall of the test box to form a water collecting tank, and the bottom of the water collecting tank is communicated with the water tank through a connecting pipe.
7. The roadbed material dry-wet cycle test device according to claim 1, wherein the bottom of the side wall of the sample tank is communicated with the bottom end of a vertical air inlet pipe;
the drying assembly includes:
the electric heating rods are in a plurality of groups and are uniformly arranged on the inner side wall of the test box;
the ventilating fans are uniformly arranged on the side wall of the test box;
the air heater is arranged outside the test box, the air outlet end of the air heater is connected with one end of an air conveying pipe, and the other end of the air conveying pipe is opposite to the inlet at the top end of the air inlet pipe and conveys hot air into the air inlet pipe.
8. The roadbed material dry-wet cycle test device according to claim 1, wherein a second electric telescopic rod is arranged on the side wall of the test box, and the moving end of the second electric telescopic rod is connected with the elastic sealing plug.
9. The roadbed material dry-wet cycle test method based on the roadbed material dry-wet cycle test device according to any one of claims 1 to 8, characterized by comprising the following steps:
firstly, weighing a dry sample, and recording the mass of the dry sample as M0;
step two, opening an openable door plate, taking out a sample groove, placing a dried sample in the sample groove, placing the sample groove on a sample carrying table, moving the sample carrying table to enable the sample carrying table to rest on a metering scale, and recording the metering scale reading number as M1;
step three, moving the sample carrying table upwards until the sample carrying table is separated from the metering scale, sealing the drain pipe by using an elastic sealing plug, then filling water into the sample tank by using the liquid supply assembly through the water inlet pipe until the sample is completely immersed, and standing until the sample is saturated in water absorption;
step four, taking out the elastic sealing plug, discharging water in the sample tank through the drain pipe, simultaneously, transferring the sample platform downwards until the sample platform contacts with the metering scale, then enabling the sample platform to be placed on the metering scale, closing the openable door plate, and drying the sample by using the drying component until the reading M2 of the metering scale is a value corresponding to the required water content;
step five, repeating the processes of the step three and the step four until the dry and wet cycle times required by the test are reached;
and step six, opening the openable door plate, taking out the sample groove, taking out the sample from the sample groove, and performing other performance tests on the sample.
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| CN114354434A (en) | 2022-04-15 |
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