CN114034558B - Device capable of developing bearing capacity of tire reinforced soil foundation and tire drawing test - Google Patents
Device capable of developing bearing capacity of tire reinforced soil foundation and tire drawing test Download PDFInfo
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- CN114034558B CN114034558B CN202111321209.4A CN202111321209A CN114034558B CN 114034558 B CN114034558 B CN 114034558B CN 202111321209 A CN202111321209 A CN 202111321209A CN 114034558 B CN114034558 B CN 114034558B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/34—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by mechanical means, e.g. hammer blows
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
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- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
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Abstract
The invention relates to a device capable of developing the bearing capacity of a tire reinforced soil foundation and a tire drawing test, which comprises a model box system; the model box system comprises a rectangular steel plate, a bottom plate and a test box formed by detachably splicing a plurality of channel steels, the internal size of the model box is adjusted by assembling and disassembling the channel steels, the rectangular steel plate and the bottom plate, and the upper surface of the test box is covered by a telescopic loading plate of the vertical direction load application system; the horizontal drawing system is fixed with the waste tire to be tested through a steel wire pull wire, a clamp and a chain rod, the whole strand part led out after the waste tire is bound by the steel wire pull wire and the chain rod are always on the same straight line, and the whole strand part and the chain rod are located on the axis of the clamp. The device can accomplish the ground bearing capacity experiment and can draw the experiment again, can wholly extract tire structure, and box structure can be suitable for multiple tire size, strong adaptability.
Description
Technical Field
The invention relates to the technical field of civil engineering and geological engineering tests, in particular to a device capable of developing the bearing capacity of a tire reinforced soil foundation and a tire drawing test.
Background
In recent years, the number of waste tires produced in China each year is the first in the world for many years, and annual report waste volume is greatly increased year by year. A large amount of waste tires are accumulated, so that the land is occupied, the natural environment is seriously polluted, the health of residents is harmed, and serious environmental problems can be caused when the waste tires are improperly treated. How to scientifically, environmentally, safely and economically recycle the waste tires efficiently is a major practical problem to be solved urgently. Due to the characteristics of good durability, good circumferential tensile property, good tread friction resistance and the like, the waste tire is applied to reinforced earth engineering of reinforcing rock-soil side slopes, retaining walls, embankments, soft foundations and the like. The waste tire reinforced soil engineering becomes a new scheme for solving the worldwide difficult problem of recycling the waste tires. The mechanical behavior of the rib-soil interface is one of the core mechanisms of reinforced soil engineering. The drawing test is an important test for measuring interface parameters of a drawn object and surrounding materials, so that the measurement of the mechanical characteristics of the interface of the waste tire and the soil is important for mastering the reinforcing mechanism and performance of the reinforced soil of the waste tire.
Generally, in order to maximize the reinforcement effect of the waste tires on the rock soil, the waste tire reinforced soil is formed by horizontally arranging and burying the tires in an underground soil layer. Therefore, the drawing test of the junked tires can be considered as a three-dimensional test, however, most of the current patents and documents related to the drawing test apparatus of the junked tires adopt tire strips or tire pieces. In fact, the waste tire is a whole body, and after the waste tire is embedded into the soil body, the waste tire has a horizontal interface and a vertical interface, so that the mechanical characteristics of the whole waste tire and the soil body cannot be reflected by a single tire strip or tire piece in the hydraulic direction for a drawing test. In addition, relevant technical specifications of the existing reinforced earth (such as technical specifications for highway geosynthetic material application (JTG/TD32-2012), "design specifications for highway subgrade (JTGD30-2015)," design specifications for railway subgrade (TB10001-2016), etc.) do not have relevant provisions for integral drawing tests of waste tires. In consideration of the fact that waste tires are used for soil body improvement, the bearing capacity of the improved foundation is a crucial improvement index. The soil-embedded tires may be embedded in a single layer or multiple layers. Most of the current test devices related to the bearing capacity of the waste tire foundation can only carry out single-type tests. For example, in the document, "study on mechanical properties of waste tire reinforced building garbage soil foundation, [ D ]. 2020 ] of university of industry in north of lake," the instrument can only be used for simply performing a single-type test on the bearing capacity of the waste tire reinforced soil foundation, and is too large and complicated in test steps. Therefore, how to design a test device can carry out the drawing test of the whole tire and also can carry out the test of the bearing capacity of the tire reinforced soil foundation, the equipment utilization rate is improved to the maximum extent, the cost is saved, and the limitation of a test instrument to the size of the tire is broken through.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: the utility model provides a device that experimental is drawn to tire reinforced earth foundation bearing capacity and tire can be developed, the device can accomplish the experiment of foundation bearing capacity and can draw the experiment again, can wholly extract the tire structure, and box structure can be suitable for multiple tire size, strong adaptability.
The technical scheme adopted by the invention for solving the technical problems is as follows: provides a device capable of developing the bearing capacity and tire drawing test of a tire reinforced soil foundation, adopts a test device to carry out the bearing capacity test and the tire drawing test of the tire reinforced soil foundation, and is characterized in that the device comprises a vertical direction load applying system, a horizontal direction drawing system, a model box system and a data acquisition system,
the vertical direction load applying system is mainly used for testing the bearing capacity of the reinforced earth foundation and simulating the setting of the burial depth;
the horizontal drawing system is mainly used for developing a rib drawing test;
the model box system mainly comprises a detachable channel steel with holes, a rectangular steel plate, a bottom plate, a rib material and a filler, and the sizes of different types of indoor test box bodies are adjusted through assembling and disassembling the channel steel, the rectangular steel plate and the bottom plate;
the data acquisition system is mainly used for acquiring stress and displacement in the test process and data information generated by the related sensors;
the vertical direction load applying system comprises a reaction frame (1), a servo motor I (2), an actuator (3), a pressure head (4), a displacement sensor I (5) and a stress sensor I (6), wherein the actuator (3) is installed on the inner side of the top of the reaction frame (1), the pressure head (4) is located inside the actuator (3), and the pressure head (4) is stretched through the reciprocating motion of a piston in the actuator (3), so that the output and the unloading of the vertical direction load are realized; the servo motor I is used for providing a loading force in the vertical direction, and the servo motor I controls the extension and retraction of the pressure head through data fed back by the displacement sensor I and the stress sensor I;
the horizontal drawing system comprises a servo motor II (7), a gearbox (8), a clamp (9), a steel wire drawing wire (10), a chain rod (11), a displacement sensor II (12) and a stress sensor II (13), wherein the clamp (9) is integrally of a plate-shaped structure formed by combining a trapezoid shape and a rectangular shape, a plurality of round holes (27) are formed in the rectangular area along the same straight line, the circle center connecting lines of all round holes are perpendicular to the drawing direction, the axis of each round hole is along the thickness direction of the clamp, the round holes are in a through hole shape, the long bottom side of the trapezoid is connected with the rectangular area into a whole, and the central side of the short bottom side of the trapezoid is provided with a mounting hole for being fixed with the chain rod (11);
one end of the steel wire stay wire (10) is connected with the waste tire (14) and the other end of the steel wire stay wire is connected with the clamp (9) through a plurality of round holes, and the concrete connection mode is as follows: the steel wire stay wire enters from a round hole in the middle, then the steel wire stay wire (10) is divided into two parts with the same number of strands, each part respectively passes through other round holes on the left side and the right side of the round hole in the middle in sequence, and the round hole at the tail end is inserted by a fastener (28) to achieve the purpose of fixing; the whole strand part of the steel wire stay wire and the chain rod (11) are always on the same straight line, and the whole strand part and the chain rod are positioned on the axis of the clamp, so that the steel wire stay wire can be ensured to be capable of pulling the center of the tire; one end of the chain rod (11) is connected with the clamp (9), and the other end of the chain rod is connected with the gearbox (8), so that the application of the drawing force of the waste tire (14) in the horizontal direction is realized;
gearbox (8) are connected with servo motor II electricity, and install displacement sensor II (12) and stress sensor II (13) between the two, gather the displacement and the atress of horizontal direction, receive servo motor II's control.
The model box system comprises a test box which is formed by detachably splicing a rectangular steel plate, a bottom plate and a plurality of channel steel, the plurality of channel steel form left and right side walls of the test box, the plurality of channel steel are detachably connected, the size inside the model box is adjusted through assembling and disassembling the channel steel, the rectangular steel plate and the bottom plate, and the upper surface of the test box is covered by a telescopic loading plate of a vertical direction load applying system; the horizontal drawing system is fixed with the waste tire to be tested through a steel wire pull wire, a clamp and a chain rod, the whole strand part led out after the waste tire is bound by the steel wire pull wire and the chain rod are always on the same straight line, and the whole strand part and the chain rod are located on the axis of the clamp.
The circle center connecting line of the round holes on the clamp can also be arranged in parallel to the drawing direction, at the moment, the round holes and the whole strand of steel wire stay wires and the chain rod are all on the same straight line, and the steel wire stay wires sequentially penetrate the round holes in a whole strand mode.
Furthermore, the model box system comprises a plurality of channel steels (15), two rectangular steel plates (16), a bottom plate (17), waste tires (14), a telescopic loading plate (18) and a filler (19), wherein the channel steels (15), the two rectangular steel plates (16) and the bottom plate (17) are detachably connected together to form a rectangular frame structure; each channel steel has the same structure and comprises wing plates and web plates, wherein the wing plates are provided with a plurality of rows of screw holes (20) along the length direction, and the screw holes of all the wing plates on all the channel steels are arranged at the same position; a plurality of connecting holes (21) are symmetrically formed in the side wall surface of the web plate of the channel steel (15), namely a plurality of connecting holes are formed in the front side and the rear side of the web plate of the channel steel;
the structure of the two rectangular steel plates is the same, multiple rows of first screw hole units (22) are symmetrically arranged in the area, close to the edge, of each rectangular steel plate (16), the number, the shape and the size of screw holes in each first screw hole unit of each vertical row of the rectangular steel plates are related to the number of unilateral channel steel and the number of connecting holes (21) on the side wall surface of a web plate of the channel steel (15), all the connecting holes on one side, corresponding to the side wall surface of the web plate of the channel steel, in each first screw hole unit are in a group, and the group of screw holes can be just connected with one channel steel;
the whole bottom plate 17 is of a rectangular structure, a plurality of fixing holes (23) are formed in the periphery of the edge of the rectangular structure, the bottom plate is installed on the ground through the fixing holes, and then the whole model box system is fixed on the ground; a plurality of vertical second screw hole units (24) are symmetrically arranged in the left and right of the bottom plate area of the fixing hole, two adjacent vertical second screw hole units are fixed with a wing plate of one channel steel, and the number of screw holes in each second screw hole unit is consistent with the number, position, shape and size of single-row screw holes (20) formed in the length direction of a single wing plate in the channel steel;
the channel steel (15), the rectangular steel plate (16) and the bottom plate (17) can be combined to form a test box, the waste tire (14) is embedded into the filler (19) and integrally positioned in the test box, and the telescopic loading plate (18) is tightly attached to the top of the filler (19); the size of scalable load plate (18) can be in the adjustment of transverse direction, the screw that is located on the channel-section steel pterygoid lamina of below is together fixed with the second screw unit on the relevant position upper plate, the height of proof box can be adjusted through the quantity of adjustment unilateral channel-section steel, the size of proof box length direction can be adjusted through the fixed position of adjustment channel-section steel fore-and-aft direction and rectangle steel sheet, the width size of proof box has been decided to the length of channel-section steel, the maximum height that highly is not less than the tire of waiting to test of single channel-section steel.
Furthermore, the telescopic loading plate is formed by two parts in a transverse inserting mode, the transverse length of the telescopic loading plate is adjusted, and the adjusted area can cover the inner space of the upper surface of the whole test box.
The number of the waste tires (14) in the test box is single or multiple, the waste tires are horizontally laid or vertically stacked, the waste tires are connected into a whole according to a set rule through steel wire pull wires when the number of the waste tires is multiple, and finally the waste tires are connected with the clamp (9).
The filler (19) is soil, construction waste or gravel soil.
The method comprises a waste tire drawing test and a waste tire reinforced soil foundation bearing capacity test, and comprises the following specific steps:
drawing test step of waste tires
S1, determining the size of the test box, the size of the telescopic loading plate and the position and the number of the channel steel (15) according to the shape parameters, the number, the arrangement and combination mode and the burial depth of the tires, namely determining the size of the inner space of the test box;
s2, determining the type, the compaction degree and the water content of the filler (19), and weighing the filler (19) with corresponding mass according to the size of the inner space of the test box and the density of the filler;
s3, determining the total number of layers of the filler in the test box, filling and tamping the filler (19) from bottom to top in layers, detecting a three-phase index of each layer when each layer is tamped, wherein the three-phase index is density, water content and particle specific gravity, and determining that the property of the filler (19) in the box is uniform when the three-phase index of each layer of the filler (19) changes within a set index change threshold range, otherwise, specifically analyzing reasons for difference generation, and re-filling and re-detecting after adjustment;
s4, setting the number of layers of the tire embedding position, laying the waste tire (14) wound with the steel wire stay (10) after compacting to the set number of layers, attaching the other end of the steel wire stay (10) to the position close to the inner wall of the channel steel (15), continuously layering and compacting the rest number of layers of fillers (19), performing offset printing and full compaction on the top layer of fillers (19) until the top surface is flat, packaging with plastic cloth, and standing for 24 hours;
s5, removing the plastic cloth, placing the telescopic loading plate (18) on the top surface of the filler (19), placing the model box system in the reaction frame (1) by adopting a cart or a forklift, adjusting the position of the box body, and ensuring that a pressure head (4) of the vertical direction load applying system is positioned right above the telescopic loading plate (18);
s6, starting the load applying system in the vertical direction, clearing all the displacement data and the stress data to ensure that the pressure head (4) contacts the top end of the telescopic loading plate (18), applying a preset overlying load in a stress control mode, measuring the vertical displacement S at the same time, and performing the step S7 when the vertical displacement S is basically kept unchanged;
s7, removing the single channel steel (15) which is close to the horizontal position of the waste tire (14), exposing the steel wire pull wire (10) attached to the channel steel in the step S4, pulling the steel wire pull wire (10) out of the test box, connecting the test box to the clamp (9), and fastening the test box by using a fastener; subsequently, the chain rod (11) is connected with the clamp (9);
s8, starting a horizontal drawing system, clearing all displacement data and stress data, extracting the waste tire (10) through a clamp (9), measuring and storing corresponding stress-strain data in the extraction process;
s9, unloading the drawing force after the test is finished, then unloading the vertical stress, moving out of the model box body system, cleaning the waste tires (14) and the filler (19) in the box body, and finishing the drawing test of the waste tires;
step two, testing the bearing capacity of the waste tire reinforced soil foundation
A1, repeating S1-S3;
a2, setting the number of layers of the tire embedding position, laying the waste tire (14) after compacting to the set number of layers, continuously layering and compacting the residual layers of the filler (19), performing offset printing and full compaction on the top layer of the filler (19) in the last layer of compaction until the top surface is flat, packaging by using plastic cloth, and standing for 24 hours;
a3, removing the plastic cloth, placing the telescopic loading plate (18) on the top surface of the filler (19), placing the model box system in the reaction frame (1) by adopting a cart or a forklift, and adjusting the position of the box body to ensure that a pressure head (4) of the vertical direction load applying system is positioned right above the telescopic loading plate (18);
a4, starting a vertical direction load application system, and clearing all displacement data and stress data to zero, so that a pressure head (4) contacts the top end of a telescopic loading plate (18), performing graded application of a vertical load sigma by adopting a stress control mode, and measuring a vertical displacement S and a vertical stress sigma at the same time;
and A5, after the test is finished, unloading the vertical stress through a servo motor of the vertical direction load applying system, moving out of the model box body system, cleaning the waste tires (14) and the fillers (19) in the box body, and finishing the test of the bearing capacity of the reinforced soil foundation of the waste tires.
The assembly mode of the test chamber is as follows: arrange the bottom plate in horizontal ground earlier, fix the one deck channel-section steel on the bottom plate through the screw on the channel-section steel pterygoid lamina afterwards, then choose a rectangle steel sheet 16 for use, according to the proof box inner space size of confirming, select certain vertical row screw on the rectangle steel sheet to be connected with the connecting hole of channel-section steel web lateral wall, be connected channel-section steel and channel-section steel according to one deck in proper order immediately, the channel-section steel is connected with the rectangle steel sheet, be connected the rectangle steel sheet of opposite side and the connecting hole of channel-section steel web lateral wall at last, all channel-section steels of homonymy constitute the lateral wall about the proof box on same horizontal position.
When the size and the arrangement mode of the waste tires are changed, the number of the channel steel or/and the connecting position of the channel steel and the two rectangular steel plates are/is changed, the internal size of the test box is adjusted, and the test device is suitable for tests of the bearing capacity and the drawing test of waste tire reinforced soil foundations with different sizes.
The substantial invariance in step S6 means that the amount of change in the vertical displacement S in 1 hour is not more than 1% of the total displacement amount, and the vertical displacement is considered to remain substantially unchanged.
In the step A4, after each level of load application, reading the vertical displacement at intervals of 15min, and when the settlement per hour is less than 0.1mm within 2 hours continuously, considering that the load is stable, and applying the next level of load; and (4) until the vertical direction load applying system cannot continue to stably load in the loading process, namely, the loading is considered to be finished.
Compared with the prior art, the invention has the beneficial effects that:
the invention belongs to the technical field of civil engineering and geological engineering tests, and designs a device for carrying out two different types of indoor tests. The device has simple structure, convenient and safe use and high test precision, overcomes the defect of single function of the traditional model box, and meets the development requirements of the bearing capacity test and the tire drawing test of the tire reinforced soil foundation; the size limitation of the traditional model box on the waste tires is broken through, and the purpose of waste tire testing in different shape parameters (tread height, tire diameter, section shape and the like) and combined modes (vertical stacking, horizontal arrangement and the like) is achieved. The method promotes the application of the waste tires in geotechnical engineering, is favorable for solving the recycling problem of the waste tires, and also provides beneficial supplement for the current reinforced soil technical specification. The shape parameters generally refer to: the height, diameter and tire profile (many circles; also multi-deformation tires, such as triangles, and cross-sectional profiles formed after being arranged and stacked). It is worth noting that: when the size of the tire is smaller, the size of the normally required model box is correspondingly reduced, the model box is in a combined form with an adjustable internal structure, the size of the model box can be changed according to shape parameters, the waste of raw materials is reduced to the greatest extent, and the test input cost is reduced.
The invention can realize two test tests of tires with different sizes by using one test box, is particularly suitable for testing small tires and tires in different stacking and arrangement modes, can set the height of filling soil according to the number of layers of the tires and the like, can pull out the whole tire after the filling soil is compacted to finish the drawing test, enlarges the applicability of the test device and avoids the waste on design.
Drawings
FIG. 1 is a schematic view showing the overall structure of the apparatus for performing a tire reinforced earth foundation bearing capacity and a tire pull-out test according to the present invention;
FIG. 2 is a schematic structural view of section A-A in FIG. 1;
FIG. 3 is a schematic structural view of a rectangular steel plate;
FIG. 4 is a schematic structural diagram of a channel;
FIG. 5 is a schematic view of the structure of the clamp;
FIG. 6 is a schematic structural view of a base plate;
FIG. 7 is a schematic view of a fastener (expansion bolt);
fig. 8 is a schematic diagram of a retractable loading plate structure.
FIG. 9 scrap tire pull test procedure.
FIG. 10 shows a step of a bearing capacity test of a reinforced earth foundation with waste tires.
Fig. 11 is a drawing force-displacement curve in the drawing test.
FIG. 12 load-displacement curve of foundation bearing capacity.
In the figure, 1 reaction frame, 2 servo motors I, 3 actuators, 4 pressure heads, 5 displacement sensors I, 6 stress sensors I, 7 servo motors II, 8 gearboxes, 9 clamps, 10 steel wire pull wires, 11 chain rods, 12 displacement sensors II, 13 stress sensors II, 14 waste tires, 15 channel steel, 16 rectangular steel plates, 17 bottom plates, 18 telescopic loading plates, 19 fillers, 20 screw holes, 21 connecting holes, 22 first screw hole units, 23 fixing holes, 24 second screw hole units, 25 computer controllers, 26 data memories, 27 round holes and 28 fasteners (expansion bolts).
Detailed Description
The present invention is further explained with reference to the following examples and drawings, but the scope of the present invention is not limited thereto.
The invention can develop a tire reinforced soil foundation bearing capacity and tire drawing test device, adopts a test device to carry out a tire reinforced soil foundation bearing capacity test and a tire drawing test, and comprises a vertical direction load applying system, a horizontal direction drawing system, a model box system and a data acquisition system.
The vertical direction load application system mainly comprises a servo motor, an actuator and a pressure head and is mainly used for testing the bearing capacity of the reinforced earth foundation and simulating the setting of burial depth;
the horizontal drawing system mainly comprises a servo motor, a gearbox, a clamp and the like and is mainly used for developing a rib drawing test;
the model box system mainly comprises a detachable channel steel with holes, a rectangular steel plate, a bottom plate, a rib material and a filler, and the sizes of different types of indoor test box bodies are adjusted through assembling and disassembling the channel steel, the rectangular steel plate and the bottom plate;
the data acquisition system mainly comprises a computer controller, a data memory and the like and is mainly used for acquiring stress and displacement in the test process and data information generated by related sensors.
The vertical direction load applying system comprises a reaction frame (1), a servo motor I (2), an actuator (3), a pressure head (4), a displacement sensor I (5) and a stress sensor I (6), wherein the actuator (3) is installed on the inner side of the top of the reaction frame (1), the pressure head (4) is located inside the actuator (3), and the pressure head (4) is stretched through the reciprocating motion of a piston in the actuator (3), so that the output and the unloading of the vertical direction load are realized; servo motor I is used for providing the loading force of vertical direction, and servo motor I is through displacement sensor I and the data that stress sensor I feedbacked and then the flexible of control pressure head.
The horizontal drawing system comprises a servo motor II (7), a gearbox (8), a clamp (9), a steel wire drawing wire (10), a chain rod (11), a displacement sensor II (12) and a stress sensor II (13), wherein the clamp (9) (see fig. 5) is integrally of a plate-shaped structure formed by combining a trapezoid and a rectangle, a plurality of round holes 27 are formed in the rectangular area along the same straight line, the circle center connecting lines of all round holes are perpendicular to the drawing direction, the axis of each round hole is along the thickness direction of the clamp, the round holes are in a through hole form, the long bottom side of the trapezoid is connected with the rectangular area into a whole, and the central side of the short bottom side of the trapezoid is provided with a mounting hole for being fixed with the chain rod 11;
one end of the steel wire stay wire (10) is connected with the waste tire (14) and the other end of the steel wire stay wire is connected with the clamp (9) through a plurality of round holes, and the concrete connection mode is as follows: the steel wire drawing wire enters from a middle round hole, then the steel wire drawing wire 10 is divided into two parts with equivalent strand number, each part respectively passes through other round holes at the left side and the right side of the middle round hole in sequence, and the end-most round hole is inserted by a fastening piece 28, so that the fixing purpose is achieved. The fastener may be an expansion bolt. The whole strand part of the steel wire stay wire and the chain rod 11 are always on the same straight line and are positioned on the axis of the clamp, so that the steel wire stay wire can be ensured to pull the center of the tire, the torque is avoided, the utilization rate of the steel wire stay wire is improved, the whole strand is connected in a strand dividing mode, and the whole drawing test cannot be influenced when one strand is disconnected. One end of the chain rod (11) is connected with the clamp (9), and the other end of the chain rod is connected with the gearbox (8); the chain rod (11) is driven to move by the rotation of a chain wheel in the gearbox (8), the chain rod only limits the movement of a rigid sheet connected with the chain rod along the two hinged connection directions of the chain rod, and one chain rod is equivalent to one constraint, so that the application of the drawing force of the waste tire (14) in the horizontal direction is realized;
the gearbox 8 is electrically connected with the servo motor II, and a displacement sensor II (12) and a stress sensor II (13) are arranged between the gearbox 8 and the servo motor II to acquire displacement and stress in the horizontal direction and be controlled by the servo motor II.
Another possible way in the present invention is: the circle center connecting lines of the round holes can be arranged in parallel to the drawing direction on the fixture, the round holes and the whole strand of steel wire drawing lines and the chain rod are all on the same straight line, and the steel wire drawing lines sequentially penetrate the round holes in a whole strand mode.
The model box system comprises a plurality of channel steels (15), two rectangular steel plates (16), a bottom plate (17), a waste tire (14), a telescopic loading plate (18) and a filler (19), wherein the channel steels (15), the two rectangular steel plates (16) and the bottom plate (17) are detachably connected together to form a rectangular frame structure; each channel steel 15 (see fig. 4) has the same structure and comprises wing plates and web plates, wherein the wing plates are provided with a plurality of rows of screw holes (20) along the length direction, and the screw holes of all the wing plates on all the channel steels are arranged at the same position; a plurality of connecting holes (21) are symmetrically formed in the side wall surface of the web plate of the channel steel (15), namely a plurality of connecting holes are formed in the front side and the rear side of the web plate of the channel steel;
the two rectangular steel plates have the same structure, multiple rows of first screw hole units 22 are symmetrically arranged in the area, close to the edge, of each rectangular steel plate 16 (see fig. 3), in the embodiment, 8 vertical rows of first screw hole units 22 are arranged on one rectangular steel plate, the number, shape and size of screw holes in each vertical row of first screw hole units of each rectangular steel plate are related to the number of single-side channel steel and the number of connecting holes 21 on the web side wall surface of the channel steel (15), all connecting holes on one side, corresponding to the web side wall surface of one channel steel, in each first screw hole unit are in one group, and the screw holes in the group can be just connected with one channel steel;
the whole bottom plate 17 (see fig. 6) is of a rectangular structure, a plurality of fixing holes (23) are formed in the periphery of the edge of the rectangular structure, the bottom plate is installed on the ground through the fixing holes, and then the whole model box system is fixed on the ground to play a role in supporting connection; 8 vertical second screw hole units (24) are symmetrically arranged in the left and right of the bottom plate area of the fixing hole, two adjacent vertical second screw hole units are fixed with a wing plate of one channel steel, and the number of screw holes in each second screw hole unit is consistent with the number, position, shape and size of single-row screw holes (20) formed in a single wing plate in the channel steel along the length direction;
the channel steel (15), the rectangular steel plate (16) and the bottom plate (17) can be combined to form a test box, the waste tire (14) is embedded into the filler (19) and integrally positioned in the test box, and the telescopic loading plate (18) is tightly attached to the top of the filler (19); the size of scalable load plate (18) can be adjusted, mainly be in transverse direction (also be the length direction of whole device), scalable load plate comprises two parts through the mode at horizontal grafting, adjust its horizontal length, a plurality of channel-section steels loop through the screw on the pterygoid lamina and connect formation rectangle side, the screw that is located on the channel-section steel pterygoid lamina of below is together fixed with the second screw unit on the corresponding position upper plate, the height of proof box can be adjusted through the quantity of adjustment unilateral channel-section steel, the size of proof box length direction can be adjusted through the position that adjustment channel-section steel fore-and-aft direction and rectangle steel sheet are fixed, the width size of proof box has been decided to the length of channel-section steel, the height of single channel-section steel is not less than the maximum height of waiting to test the tire.
The data acquisition system comprises a computer controller (25) and a data memory (26), and is mainly used for acquiring and storing relevant data of the displacement sensor I (5), the stress sensor I (6), the displacement sensor II (12) and the stress sensor II (13) and controlling the progress and the end of a test. The computer controller (25), the data memory (26) and the two servo motors are all arranged on one platform, so that the operation and the control are convenient.
The load transmission mode in the vertical direction mainly applies stress to the telescopic loading plate (18) through the pressure head (4) so as to apply uniform vertical load to the filler (19);
the interior of the test box is generally paved with a plastic film or uniformly coated with a lubricant for reducing the friction between the filler (19) and the channel steel (15) and the rectangular steel plate (16);
the steel wire stay wire (10) is tightly connected with the waste tire (14) in a winding mode and the like.
The waste tires (14) in the test box can be single or multiple, can be horizontally laid or vertically stacked, and can be connected into a whole according to a set rule through a steel wire pull wire when multiple waste tires (14) are arranged in the test box, and finally, the waste tires are connected with the clamp (9).
One end of the steel wire stay wire (10) is firmly tied through a fastener after being connected with the clamp (9), so that the steel wire stay wire (10) is prevented from loosening or being drawn out of the clamp (9) in the test process.
The filler (19) can be soil, and can also be materials such as construction waste, gravel soil and the like.
The number of the inverted U-shaped steel brackets of the reaction frame (1) is two, and the inverted U-shaped steel brackets are arranged in a cross shape.
The invention also discloses a test method for developing the bearing capacity and the tire drawing test of the tire reinforced soil foundation, the test method uses the device, the test method comprises a waste tire drawing test and a waste tire reinforced soil foundation bearing capacity test, and the specific steps are as follows:
drawing test step of waste tires
S1, determining the size of the test box, the size of the loading plate (18) and the position and the number of the channel steel (15) according to the test working conditions (such as the shape parameters, the number, the arrangement and combination modes and the like of the buried tires, and the buried depth mainly relates to the size of a vertical load), namely determining the size of the internal space of the test box; the specific instrument assembly sequence is as follows:
the assembly mode of the test chamber is as follows: arrange the bottom plate in horizontal ground earlier, fix the one deck channel-section steel on the bottom plate through the screw on the channel-section steel pterygoid lamina afterwards, then choose a rectangle steel sheet 16 for use, according to the proof box inner space size of confirming, select the first screw unit of a certain vertical row on the rectangle steel sheet to be connected with the connecting hole of channel-section steel web lateral wall, be connected channel-section steel and channel-section steel according to one deck in proper order immediately, the channel-section steel is connected with above-mentioned rectangle steel sheet, at last be connected the rectangle steel sheet of opposite side and the connecting hole of channel-section steel web lateral wall, all channel-section steels of homonymy are on same horizontal position.
S2, determining the type, the compaction degree and the water content of the filler (19), and weighing the filler (19) with corresponding mass according to the size of the inner space of the test box and the density of the filler;
s3, determining the total number of layers of the filler in the test box, filling and tamping the filler (19) from bottom to top in layers, detecting three-phase indexes (density, water content and particle specific gravity) of each layer when each layer is tamped, determining that the three-phase indexes of each layer of the filler (19) do not change greatly (setting an index change threshold range, determining that the three-phase indexes of each layer of the filler (19) do not change greatly when the three-phase indexes of each layer of the filler (19) change in the set index change threshold range, determining that the three-phase indexes change slightly, determining that the set index change threshold range is different according to different filler attributes, determining that the property of the filler (19) in the box is uniform, and re-filling and re-detecting the filler after adjustment if the detected indexes have larger difference and the reason for generating the difference is analyzed specifically;
s4, setting the number of layers of the tire embedding position, laying the waste tire (14) wound with the steel wire stay (10) after compacting to the set number of layers, attaching the other end of the steel wire stay (10) to the position close to the inner wall of the channel steel (15), continuously layering and compacting the rest number of layers of fillers (19), performing offset printing and full tamping on the top layer of fillers (19) until the top surface is flat, packaging with plastic cloth, and standing for 24 hours;
s5, removing the plastic cloth, placing the telescopic loading plate (18) on the top surface of the filler (19), placing the model box system in the reaction frame (1) by adopting a cart or a forklift, adjusting the position of the box body, and ensuring that the pressure head (4) is positioned right above the model box system;
s6, starting a computer controller (25), starting a servo motor I (2), clearing all displacement data and stress data to zero, enabling a pressure head (4) to contact the top end of a telescopic loading plate (18), applying a preset overlying load in a stress control mode, measuring vertical displacement S by using a displacement sensor I (5), and performing S7 when the vertical displacement S is basically unchanged; the substantially constant in this embodiment means that the amount of change in the vertical displacement S in 1 hour is not more than 1% of the total displacement amount, and it is considered that the vertical displacement is substantially constant.
S7, removing the channel steel (15) which is close to the horizontal position of the waste tire (14), exposing the steel wire pull wire (10) attached to the channel steel in the step S4, connecting the steel wire pull wire (10) to the clamp (9) and fastening the clamp with a fastener; subsequently, the chain rod (11) is connected with the clamp (9);
s8, starting a servo motor II (7), clearing all displacement data and stress data, starting a gearbox (8), driving a clamp (9) to extract a waste tire (10), measuring corresponding stress and strain data by a displacement sensor II (12) and a stress sensor II (13), and storing the stress and strain data into a data storage (26);
s9, after the test is finished, the drawing force is unloaded, then the vertical stress is unloaded, the model box body system is moved out of the reaction frame (1), and the waste tires (14) and the fillers (19) in the box body are cleaned.
Step two, testing the bearing capacity of the waste tire reinforced soil foundation
A1, repeating S1-S3;
a2, laying the waste tires (14) after compacting to a set number of layers, continuously layering and compacting the fillers (19) in the remaining layers, performing offset printing and full compaction on the top layer fillers (19) until the top surface is flat when the last layer of compaction is performed, packaging by using plastic cloth, and standing for 24 hours;
a3, removing the plastic cloth, placing the telescopic loading plate (18) on the top surface of the filler (19), placing the model box system in the reaction frame (1) by using a cart or a forklift, and adjusting the position of the box body to ensure that the pressure head (4) is positioned right above the model box system;
a4, starting a computer control system, starting a servo motor I (2), and resetting all displacement data and stress data to ensure that a pressure head (4) contacts the top end of a telescopic loading plate (18), performing graded application of a vertical load sigma in a stress control mode, and simultaneously measuring a vertical displacement S by adopting a displacement sensor I (5) and a vertical stress sigma by adopting a stress sensor I (6); generally, after each stage of load application, reading the vertical displacement at intervals of 15min, and when the settlement per hour is less than 0.1mm within 2 hours continuously, considering that the load is stable and applying the next stage of load can be carried out; until the loading device can not continue to stably load in the loading process, the loading is considered to be finished;
A5. after the test is finished, the vertical stress is relieved through the servo motor, the model box body system is removed from the reaction frame (1), and waste tires (14) and fillers (19) in the box body are cleaned.
Example 1
The steps of the junked tire drawing test of the present invention are shown in fig. 9.
Test conditions were determined, test boxes were assembled and prepared for packing (referred to as S1-S2). The buried depth is 1.5m, and the shape parameters of a single tire are as follows: tread height 40mm, tire cutThe surface shape is circular, the outer diameter of the tire is 200mm, and the thickness of the tire skin is 15 mm. The inside dimensions of the test chamber were 600mm by 500mm by 220mm in length by width by height. The effective length x width x height of the adjustable retractable load plate is 550mm x 400mm x 10 mm. The number of the channel steel is 8 (the left channel steel and the right channel steel are 4 respectively). The type of the filler is sand with water content of 0% and density of 1.9g/cm 3 The degree of compaction of the filling in the tank is 65%. Arrange the bottom plate in the level subaerial, fix one deck channel-section steel on the bottom plate through the screw on the channel-section steel pterygoid lamina afterwards, then choose a rectangle steel sheet for use, select the first screw unit of suitable vertical row, be connected the first screw unit of selected rectangle steel sheet and the connecting hole of channel-section steel web lateral wall, remain three-layer channel-section steel and be connected with above-mentioned rectangle steel sheet according to the order immediately, be connected the rectangle steel sheet of opposite side and the connecting hole of channel-section steel web lateral wall at last
Sample filling (referred to as S3-S4). Filling sandy soil in a layered filling mode. The thickness of each layer was 50 mm. After the first layer of sandy soil is filled, the waste tires are buried, and the steel wire stay wire is ensured to be arranged near the inner wall of the channel steel. And then, continuously filling the sandy soil until the depth of the sandy soil reaches 200 mm. And finally, ramming the top surface of the filled soil, packaging the filled soil by using plastic cloth, and standing for 24 hours.
Test box placement and position fine tuning (S5 is involved). Removing the plastic cloth, placing the telescopic loading plate on the top surface of the sandy soil, placing the model box system in the reaction frame by adopting a cart or a forklift, adjusting the position of the box body, and ensuring that the pressure head is positioned right above the model box system.
Vertical load application (involving S6-S7). Starting a computer controller, starting a servo motor I, and resetting all displacement data and stress data to make the pressure head contact the top of the telescopic loading plate, applying 20KN vertical total load step by step (equivalent to the total gravity generated by 1.5m of burial depth, 5KN load of each level) by adopting a stress control mode, and simultaneously measuring the vertical displacement S by adopting a displacement sensor I. When the load is applied step by step, when the vertical displacement S is continuously less than 0.05mm/min for 5 minutes, the next-stage loading can be carried out. When the amount of change in the total vertical displacement S in 1 hour is not more than 1% of the total displacement amount, it is considered that the vertical displacement remains substantially unchanged.
Horizontal pull tests were performed (involving S7-S8). Removing the channel steel with the horizontal position close to that of the waste tire, connecting the steel wire pull wire to the clamp and fastening the steel wire pull wire with a fastener (expansion bolt); the chain bar is then connected to the clamp. And starting a servo motor II, resetting all displacement data and stress data, starting a gearbox, carrying out a drawing test at a horizontal loading rate of 1mm/min, driving the clamp until the waste tire is drawn out and damaged, and stopping the test. And the displacement sensor II and the stress sensor II measure corresponding stress-strain data and store the stress-strain data in the data memory, and the obtained test result is shown in figure 11.
Material cleaning and device removal after the end of the test (referred to S9). And after the test is finished, the drawing force is unloaded, then the vertical stress is unloaded, the model box body system is moved out of the reaction frame, and the waste tires and the sandy soil in the box body are cleaned.
Example 2
The steps of the test of the bearing capacity of the junked tire reinforced soil foundation of the present invention are shown in fig. 10.
Test conditions were determined, test boxes were assembled and the packing (referred to as a1) was prepared. 2 tires are horizontally arranged into a rectangle, and the tire shape parameters are as follows: the height of the tread is 30mm, the section shape of the tire is circular, the outer diameter of the tire is 200mm, and the thickness of the tire skin is 10 mm. The inside dimensions of the test chamber were 1500mm by 500mm by 400mm in length by width by height. The size of the telescopic loading plate after adjustment is as follows: the length X width X height is 1300mm X400 mm X20 mm. The number of the channel steel is 12 (the left and the right are 6 respectively). The type of the filler is selected from construction waste, the water content is 10 percent, and the density is 1.84g/cm 3 The degree of compaction of the filling in the tank is 80%.
Sample filling (referred to as a 2). The construction waste is filled in a layered filling mode. The thickness of each layer was 50 mm. After the first layer of construction waste is filled, the waste tires are connected and then buried, and the steel wire pull wire is ensured to be arranged near the inner wall of the channel steel. And then, continuously loading the construction waste until the depth of the construction waste reaches 350 mm. And finally, leveling the top surface of the filled soil, packaging by using plastic cloth, and standing for 24 hours.
Test box placement and position fine tuning (referred to as a 3). Removing the plastic cloth, placing the telescopic loading plate on the top surface of the sandy soil, placing the model box system in a reaction frame by adopting a cart or a forklift, adjusting the position of the box body, and ensuring that the pressure head is positioned right above the model box system.
Reinforced earth foundation bearing capacity test (refer to a 4). Starting a computer controller, starting the servo motor I, resetting all displacement data and stress data to ensure that the pressure head contacts the top end of the telescopic loading plate,
the method comprises the following steps of applying vertical loads sigma in a stress control mode in a grading manner, wherein the size of each grade of load is 40N, measuring vertical displacement S by using a displacement sensor I (5), and measuring vertical stress sigma by using a stress sensor I (6); after each stage of load application, reading the vertical displacement once at intervals of 15min, and when the settlement per hour is less than 0.1mm within 2 hours continuously, considering that the load is stable and applying the next stage of load; and (4) until the loading device cannot continue to stably load in the loading process, namely, the loading is considered to be finished. The test results are shown in FIG. 12.
Test material cleaning and device removal (referred to as a 5). And (4) after the test is finished, unloading the vertical stress, moving out the model box body system from the reaction frame, and cleaning waste tires and construction waste in the box body.
The testing device is detachable and adjustable, the internal space of the box body system can be freely changed according to the difference of the size, the arrangement mode and the like of the tire, the purpose that the whole tire is pulled out of the box body is achieved, and therefore the purpose that the limitation of the size of the tire is broken through and the applicability of the device is expanded to the maximum degree is achieved. The invention innovatively provides a test device and a test method for the bearing capacity and the drawing of the reinforced soil foundation of the whole waste tire, fills the blank of the current test method and the drawing method for the bearing capacity of the reinforced soil foundation of the tire to a great extent, and has very important reference significance and research value.
The burial depth of the tire in the test method of the present invention directly affects the magnitude of the vertical load (i.e., S6). If the tire is a small tire, the size of the mold box (the number of the channels moved from the sides to the middle and the amount of the filler used) and the amount of the filler used in step S1 are changed, and on the contrary, the size of the mold box is increased and the amount of the filler used is increased.
Nothing in this specification is said to apply to the prior art.
Claims (7)
1. A device capable of developing the bearing capacity and tire drawing test of a tire reinforced soil foundation adopts a test device to carry out the bearing capacity test and the tire drawing test of the tire reinforced soil foundation, the device comprises a vertical direction load applying system, a horizontal direction drawing system, a model box system and a data acquisition system, and is characterized in that,
the vertical direction load applying system is mainly used for testing the bearing capacity of the reinforced earth foundation and simulating the setting of the burial depth;
the horizontal drawing system is mainly used for developing a rib drawing test;
the model box system mainly comprises a detachable channel steel with holes, a rectangular steel plate, a bottom plate, a rib material and a filler, and the sizes of different types of indoor test box bodies are adjusted through assembling and disassembling the channel steel, the rectangular steel plate and the bottom plate; the test box comprises a plurality of channel steels (15), two rectangular steel plates (16) and a bottom plate (17), wherein the channel steels (15), the two rectangular steel plates (16) and the bottom plate (17) can be detachably connected together to form a rectangular frame structure, the channel steels (15), the rectangular steel plates (16) and the bottom plate (17) can be combined to form a test box, the height of the test box can be adjusted by adjusting the number of the channel steels on one side, the size of the length direction of the test box can be adjusted by adjusting the positions, fixed with the rectangular steel plates, of the front and back directions of the channel steels, the length of the channel steels determines the width size of the test box, and the height of a single channel steel is not less than the maximum height of a tire to be tested; when the drawing experiment is carried out, removing a single channel steel (15) which is close to the horizontal position of the waste tire (14);
the data acquisition system is mainly used for acquiring stress and displacement in the test process and data information generated by the related sensors;
the vertical direction load applying system comprises a reaction frame (1), a servo motor I (2), an actuator (3), a pressure head (4), a displacement sensor I (5) and a stress sensor I (6), wherein the actuator (3) is installed on the inner side of the top of the reaction frame (1), the pressure head (4) is located inside the actuator (3), and the pressure head (4) is stretched through the reciprocating motion of a piston in the actuator (3), so that the output and the unloading of the vertical direction load are realized; the servo motor I is used for providing a loading force in the vertical direction, and the servo motor I controls the extension and retraction of the pressure head through data fed back by the displacement sensor I and the stress sensor I;
the horizontal drawing system comprises a servo motor II (7), a gearbox (8), a clamp (9), a steel wire drawing wire (10), a chain rod (11), a displacement sensor II (12) and a stress sensor II (13), wherein the clamp (9) is integrally of a trapezoidal and rectangular combined plate-shaped structure, a plurality of round holes (27) are formed in a rectangular area along the same straight line, the circle center connecting lines of all round holes are perpendicular to the drawing direction, the axes of the round holes are in the thickness direction of the clamp, the round holes are in a through hole form, the long bottom edge of each trapezoid is connected with the rectangular area into a whole, and the center side of the short bottom edge of each trapezoid is provided with a mounting hole for fixing the trapezoid with the chain rod (11);
one end of the steel wire stay wire (10) is connected with the waste tire (14) and the other end of the steel wire stay wire is connected with the clamp (9) through a plurality of round holes, and the concrete connection mode is as follows: the steel wire stay wire enters from a round hole in the middle, then the steel wire stay wire (10) is divided into two parts with the same number of strands, each part respectively passes through other round holes on the left side and the right side of the round hole in the middle in sequence, and the round hole at the tail end is inserted by a fastener (28) to achieve the purpose of fixing; the whole strand part of the steel wire stay wire and the chain rod (11) are always on the same straight line, and the whole strand part of the steel wire stay wire and the chain rod are positioned on the axis of the clamp, so that the steel wire stay wire can be used for pulling the right center of the tire; one end of the chain rod (11) is connected with the clamp (9), and the other end of the chain rod is connected with the gearbox (8), so that the application of the drawing force of the waste tire (14) in the horizontal direction is realized;
gearbox (8) are connected with servo motor II electricity, and install displacement sensor II (12) and stress sensor II (13) between the two, gather the displacement and the atress of horizontal direction, receive servo motor II's control.
2. The apparatus for testing the bearing capacity of a deployable tire reinforced soil foundation and the tire pulling capability of claim 1, wherein the connection line of the circle centers of the circular holes on the fixture can be set parallel to the pulling direction, and at this time, the circular holes, the whole strand of the steel wire pulling wire and the chain bar are all on the same straight line, and the steel wire pulling wire sequentially penetrates into the circular holes in a whole strand manner.
3. The apparatus for testing the bearing capacity and the tire drawing force of the expandable tire reinforced soil foundation according to claim 1, wherein the mold box system comprises a plurality of channel steels (15), two rectangular steel plates (16), a bottom plate (17), a waste tire (14), a retractable loading plate (18) and a filler (19), wherein the channel steels (15), the two rectangular steel plates (16) and the bottom plate (17) are detachably connected together to form a rectangular frame structure; the structure of each channel steel is the same, each channel steel comprises a wing plate and a web plate, the wing plates are provided with a plurality of rows of screw holes (20) along the length direction, and the positions of the screw holes of all the wing plates on all the channel steels are the same; a plurality of connecting holes (21) are symmetrically formed in the side wall surface of the web plate of the channel steel (15), namely a plurality of connecting holes are formed in the front side and the rear side of the web plate of the channel steel;
the structure of the two rectangular steel plates is the same, multiple rows of first screw hole units (22) are symmetrically arranged in the area, close to the edge, of each rectangular steel plate (16), the number, the shape and the size of screw holes in each first screw hole unit of each vertical row of the rectangular steel plates are related to the number of unilateral channel steel and the number of connecting holes (21) on the side wall surface of a web plate of the channel steel (15), all the connecting holes on one side, corresponding to the side wall surface of the web plate of the channel steel, in each first screw hole unit are in a group, and the group of screw holes can be just connected with one channel steel;
the whole bottom plate 17 is of a rectangular structure, a plurality of fixing holes (23) are formed in the periphery of the edge of the rectangular structure, the bottom plate is installed on the ground through the fixing holes, and then the whole model box system is fixed on the ground; a plurality of vertical second screw hole units (24) are symmetrically arranged in the left and right of the bottom plate area of the fixing hole, two adjacent vertical second screw hole units are fixed with a wing plate of one channel steel, and the number of screw holes in each second screw hole unit is consistent with the number, position, shape and size of single-row screw holes (20) formed in the length direction of a single wing plate in the channel steel;
the channel steel (15), the rectangular steel plate (16) and the bottom plate (17) can be combined to form a test box, the waste tire (14) is embedded into the filler (19) and integrally positioned in the test box, and the telescopic loading plate (18) is tightly attached to the top of the filler (19); the size of scalable load plate (18) can be in the adjustment of transverse direction, the screw that is located on the channel-section steel pterygoid lamina of below is together fixed with the second screw unit on the relevant position upper plate, the height of proof box can be adjusted through the quantity of adjustment unilateral channel-section steel, the size of proof box length direction can be adjusted through the fixed position of adjustment channel-section steel fore-and-aft direction and rectangle steel sheet, the width size of proof box has been decided to the length of channel-section steel, the maximum height that highly is not less than the tire of waiting to test of single channel-section steel.
4. The apparatus for testing bearing capacity of expandable tire reinforced soil foundation and tire pulling capability of claim 3, wherein the retractable loading plate is formed by two parts in a transverse insertion manner, the transverse length of the retractable loading plate is adjusted, and the adjusted area can cover the inner space of the upper surface of the whole test box.
5. The device for testing the bearing capacity and the tire drawing of the expandable tire reinforced soil foundation according to claim 3, wherein 8 vertical rows of first screw hole units (22) are arranged on one rectangular steel plate, and a plastic film is laid on the inner wall of the test box or a lubricant is uniformly coated on the inner wall of the test box; the steel wire stay wire (10) is tightly connected with the waste tire (14) in a winding mode.
6. The apparatus for testing the bearing capacity and the tire pulling force of the expandable tire reinforced soil foundation according to any one of claims 1 to 5, wherein the number of the junked tires (14) in the test chamber is single or multiple, the junked tires are horizontally laid or vertically stacked, and the junked tires are connected into a whole according to a set rule through a steel wire pulling line in multiple, and finally connected with the clamp (9).
7. The developable tire reinforced soil foundation bearing capacity and tire pull test apparatus according to claim 6, characterized in that the filler (19) is soil, construction waste or gravel soil.
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| CN103674706A (en) * | 2013-12-18 | 2014-03-26 | 湖北工业大学 | Pullout and model dual-purpose test device for reinforced earth structure of tire as well as test measurement method |
| WO2018195919A1 (en) * | 2017-04-28 | 2018-11-01 | 山东大学 | Intelligent numerically-controlled extra-high pressure true three-dimensional non-uniform loading and unloading and pressure regulating model test system |
| CN208132856U (en) * | 2018-05-07 | 2018-11-23 | 深圳市东部公共交通有限公司 | Bearing-type wheel hub drawbench |
| CN108978623A (en) * | 2018-07-31 | 2018-12-11 | 湖北工业大学 | Adulterate the composite reinforced Base with Sand Gravel Cushion and construction method of building waste and waste tire |
| CN109163915A (en) * | 2018-09-19 | 2019-01-08 | 山东大学 | Experimental rig and method for tyre strip pull-out test |
| CN111069316A (en) * | 2018-10-18 | 2020-04-28 | 大冶市博泰异型钢有限公司 | Special-shaped steel drawing production line |
| CN110967249A (en) * | 2019-11-13 | 2020-04-07 | 鞍钢集团矿业有限公司 | Direct shearing and drawing tester for geosynthetic material |
| CN111037790A (en) * | 2020-02-23 | 2020-04-21 | 杨松 | Crushing robot for waste heavy-duty tire casings |
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| CN114034558A (en) | 2022-02-11 |
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