CN114216595A - Test device and method for measuring frictional resistance of thixotropic slurry - Google Patents
Test device and method for measuring frictional resistance of thixotropic slurry Download PDFInfo
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- CN114216595A CN114216595A CN202111308382.0A CN202111308382A CN114216595A CN 114216595 A CN114216595 A CN 114216595A CN 202111308382 A CN202111308382 A CN 202111308382A CN 114216595 A CN114216595 A CN 114216595A
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Abstract
The invention provides a test device and a method for measuring the frictional resistance of thixotropic slurry, wherein the test device comprises: a test bed; the sliding box is filled with precast concrete blocks and used for simulating a reinforced concrete box culvert on site and coating thixotropic slurry on the surface of the concrete; the loading device is loaded above the concrete along the longitudinal direction, a soil sample is filled in the loading device so as to simulate an overlying soil body of the box culvert in the jacking construction process, and the loaded soil sample is contacted with the thixotropic slurry; the horizontal dynamometer is horizontally and fixedly connected to the side part of the loading device, and a baffle plate which is opposite to the horizontal dynamometer is arranged on the test bed; the sliding box is driven to slide towards the baffle along the test bed, the horizontal dynamometer is stopped by the baffle, the loading device and the sliding box slide relatively, and the frictional resistance between the soil sample and the concrete is displayed through the horizontal dynamometer, so that the effect between the box culvert, the slurry and the overlying soil body in the jacking process of the box culvert under the occurrence state of thixotropic slurry is simulated.
Description
Technical Field
The invention belongs to the technical field of thixotropic slurry evaluation, and particularly relates to a test device and a method for measuring the frictional resistance of thixotropic slurry.
Background
With the continuous acceleration of the modernized construction pace of cities in China, the pipe curtain box culvert jacking construction is widely applied to the development of underground spaces of the cities. The thixotropic slurry is used as an essential material in the jacking construction of the pipe curtain box culvert, can play a role in reducing drag and lubrication and can also play a role in supporting and reducing sedimentation. Therefore, the frictional resistance of the thixotropic slurry is accurately measured, the drag reduction effect of the thixotropic slurry is effectively evaluated, and the selection of the thixotropic slurry with a proper proportion for engineering is very important. The existing test device for measuring the frictional resistance of the thixotropic slurry is complex, has a complex operation process and is difficult to accurately measure the real frictional resistance.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a testing device for measuring the frictional resistance of thixotropic slurry, which has a simple structure.
In order to achieve the above purpose, the invention provides the following technical scheme:
a test device for determining the frictional resistance of a thixotropic slurry, said test device comprising:
a test bed;
the sliding box is filled with concrete and used for simulating an on-site box culvert, and thixotropic slurry is coated on the surface of the concrete;
the loading device is loaded above the concrete along the longitudinal direction, a soil sample is filled in the loading device, and the soil sample is contacted with the thixotropic slurry so as to simulate an overlying soil body of the box culvert in the jacking construction process;
the horizontal dynamometer is horizontally and fixedly connected to the side part of the loading device, and a baffle plate facing the horizontal dynamometer is arranged on the test bed;
the sliding box is driven to slide towards the baffle along the test bed, the horizontal dynamometer is stopped by the baffle, the loading device and the sliding box slide relatively, and the frictional resistance between the soil sample and the concrete is displayed through the horizontal dynamometer, so that the frictional resistance between the box culvert and the overlying soil body in the jacking process of the box culvert is simulated under the occurrence state of thixotropic slurry.
Preferably, the loading device comprises a loading box and a loading plate, the loading plate is longitudinally and slidably assembled inside the loading box, and the soil sample is filled between the loading plate and the thixotropic slurry in the loading box;
the loading plate is loaded with counterweights, and the counterweights are increased and decreased so as to simulate different pressures of overlying soil bodies in the box culvert jacking process.
Preferably, a loading frame shaped like a Chinese character 'kou' is sleeved outside the test bed and the sliding box, a lever is hinged to the bottom of the test bed, and the counterweight is arranged on the lever so as to apply pressure to the loading frame through the lever, so that the loading frame applies pressure to the loading plate along the longitudinal direction.
Preferably, the below of test bench is equipped with and is located the slide under the loading board, be equipped with on the slide the spout that the slip case slip direction extends, the lever pass through the hinge slip assemble in the spout, it is corresponding, the loading frame is located the lever corresponds one side of counterweight, and be close to the hinge.
Preferably, the sliding seat comprises two L-shaped fixing plates which are oppositely arranged, a sliding groove is formed between the two fixing plates, an ear plate extending to the position between the two fixing plates is arranged in the middle of the lever, and the hinge shaft is arranged on the ear plate.
Preferably, the loading frame is a square structure formed by combining four support rods, wherein the middle parts of the support rods above the loading plate are connected with upright posts through bolts, the upright posts point to the loading plate along the longitudinal direction, and the loading plate is provided with placing grooves corresponding to the upright posts.
Preferably, the bottom of the sliding box is leveled by sand, a waterproof board is placed above the sand, and the concrete is filled above the waterproof board.
Preferably, a driving device is arranged on the test bed, acts on one side, far away from the baffle, of the sliding box, and simulates the dynamic construction process of box culvert jacking through controlling the pushing speed.
Preferably, the distance between the upper surface of the thixotropic slurry and the upper surface of the slide box is not less than twice the thickness of the thixotropic slurry.
A test method for determining the frictional resistance of a thixotropic slurry, said method comprising:
step S1, placing a sliding box on a test bed for simulating an on-site box culvert, filling concrete in the sliding box for simulating the on-site box culvert, and coating thixotropic slurry on the surface of the concrete;
step S2, after filling the loading device with a soil sample, loading the loading device on the loading plate along the longitudinal direction to enable the soil sample to be in contact with the thixotropic slurry so as to simulate the overlying soil pressure of the box culvert in the jacking construction process;
step S3, the horizontal dynamometer is made to face the baffle plate arranged on the test bed;
and step S4, driving the sliding box to slide towards the baffle along the test bed, stopping the horizontal dynamometer by the baffle, enabling the loading device and the sliding box to slide relatively, and displaying the frictional resistance between the soil sample and the concrete through the horizontal dynamometer, so as to simulate the frictional resistance between the box culvert and the overlying soil body in the jacking process of the box culvert under the occurrence state of thixotropic slurry.
Has the advantages that: the device for measuring the frictional resistance of the slurry and the test method thereof can prevent the problem of loss of the thixotropic slurry in the test process, can simulate the earth covering pressure on a box culvert on site, can also simulate the jacking speed of the box culvert, accurately measure the frictional resistance of the thixotropic slurry, and accurately evaluate the drag reduction effect of the thixotropic slurry, thereby recommending the drag reduction slurry with proper proportion for site construction, and having small volume, light weight, convenient operation and convenient carrying.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
FIG. 1 is a schematic diagram of a test apparatus according to an embodiment of the present invention;
fig. 2 is a schematic view illustrating the installation of a loading frame according to an embodiment of the present invention.
In the figure, 1 is a test bed; 2 is a sliding box; 3 is a driving device; 4 is a loading box; 5 is a loading frame; 6 is a vertical deformation dial indicator; 7 is a horizontal dynamometer; 8 is a lever; 9 is a weight; 10 is sandstone; 11 is a waterproof board; 12 is concrete; 13 is thixotropic slurry; 14 is a soil sample; 15 is a permeable plate; 16 is a loading plate; 17 is a fixed plate; 18 is a baffle plate; 19 is a column; 20 is a hinge shaft; 21 is a roller; 22 is a balance block; 23 is a slide bar.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" used herein should be interpreted broadly, and may include, for example, a fixed connection or a detachable connection; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
As shown in fig. 1-2, a test device for measuring the friction resistance of thixotropic slurry comprises a test bed 1, wherein the test bed 1 at least has a smooth upper surface for placing a sliding box 2; the sliding box 2 is placed on the upper surface of the test bed 1 and can slide along the upper surface of the test bed 1, the sliding box 2 is used for simulating an on-site box culvert, concrete 12 is filled in the sliding box 2, and thixotropic slurry 13 is smeared on the surface of the concrete 12; the loading device is loaded above the concrete 12 along the longitudinal direction, a soil sample 14 is filled in the loading device, the soil sample 14 is preferably obtained by sampling at a construction site, so that the humidity and the density of the soil sample 14 are guaranteed to be equal to the construction site to the maximum extent and are kept consistent, and after loading, soil, slurry and concrete blocks can be contacted to simulate the overlying soil of a box culvert in the jacking construction process; the horizontal dynamometer 7 is characterized in that the horizontal dynamometer 7 is horizontally and fixedly connected to the side part of the loading device, and a baffle plate 18 which is opposite to the horizontal dynamometer 7 in the horizontal direction is arranged on the test bed 1; the sliding box 2 is driven to slide to the baffle 18 along the test bed 1, the horizontal dynamometer 7 is stopped by the baffle 18, the loading device and the sliding box 2 slide relatively, and the frictional resistance between the soil sample 14 and the concrete 12 is displayed through the horizontal dynamometer 7, so that the frictional resistance between the box culvert and the overlying soil body in the jacking process of the box culvert after the thixotropic slurry 13 is injected is simulated. The data displayed by the horizontal dynamometer 7 are the frictional resistance of the thixotropic slurry 13 filled between the soil sample 14 and the concrete 12, so that the effect between the box culvert and the slurry and the overlying soil body in the jacking process of the box culvert under the occurrence state of the thixotropic slurry is simulated, and the drag reduction effect of the thixotropic slurry 13 is evaluated. Wherein the concrete is a precast concrete block.
In another alternative embodiment, in the case that the loading device comprises a loading box 4 and a loading plate 16, the loading plate 16 is assembled inside the loading box 4 in a sliding mode along the longitudinal direction, and the soil sample 14 is filled and filled between the loading plate 16 and the thixotropic slurry 13 in the loading box 4; the loading box 4 is placed above the concrete 12 and the thixotropic slurry 13, and at least the length in the driving direction of the sliding box 2 is smaller than the length corresponding to the inner cavity of the sliding box 2, so that the loading box 4 can slide and move for a certain distance relative to the sliding box 2 in the test process; in addition, the loading plate 16 is loaded with the counter weights, the counter weights are increased or decreased on the loading box 4, and the loading pressure is changed, so that different pressures of the overlying soil bodies in the box culvert jacking process are simulated.
Specifically, the sliding box 2 is a square box body with an open upper end, the loading box 4 is a square cylinder, and the whole loading box 4 is smaller than the sliding box 2 in size.
In another alternative embodiment, a loading frame 5 shaped like a Chinese character 'kou' is sleeved outside the test bed 1 and the sliding box 2, a lever is hinged at the bottom of the test bed 1, and a counterweight is arranged on the lever to load the loading frame 5 with pressure through the lever, so that the loading frame 5 applies pressure to the loading plate along the longitudinal direction. Based on the angle that the operation is convenient, the top of test bench 1 is arranged in to the load board, and loading frame 5 cup joints test bench 1 and slide box 2, sets up the weight in the below of test bench 1, effectively reduces the focus of joining in marriage the heavy object, improves loading device's stability in the test process, and the operation of being convenient for need not to carry the weight and has passed test bench 1, reduces operating personnel's working strength.
In another alternative embodiment, a sliding seat is arranged below the test bed 1 and is positioned right below the loading plate, a sliding groove extending in the sliding direction of the sliding box 2 is arranged on the sliding seat, the lever 8 is slidably assembled in the sliding groove through a hinge shaft 20, and correspondingly, the loading frame 5 is positioned on one side of the lever 8 corresponding to the counterweight and is close to the hinge shaft 20. In the test process, the lever 8 can slide along the sliding groove, so that the loading stability of the loading device in the test process is ensured. The balance weights are connected with a plurality of balance weights in a detachable mode, and the moment arm of the loading frame 5 on the lever 8 is smaller than that of the balance weights. According to the lever 8 principle, the force arm corresponding to the counterweight is large, and the counterweight with small weight can be used for generating large loading pressure, so that the operation is convenient; the pressure of the earthing soil at different depths is simulated by increasing or decreasing the weight of the counterweight or adjusting the weight of the counterweight.
In this embodiment, the counterweight may be a weight 9, the force arm of the counterweight is more than five times that of the loading frame 5, and the specific loading pressure is obtained by calculating according to the theorem of the lever 8.
In this embodiment, the sliding seat comprises two L-shaped fixing plates 17 arranged oppositely, a sliding slot is formed between the two fixing plates 17, a lug plate extending to the position between the two fixing plates 17 is arranged in the middle of the lever 8, and the hinge shaft 20 is arranged on the lug plate.
Preferably, a contact point corresponding to the loading frame 5 is provided on the lever 8 to fix the moment arm corresponding to the loading frame 5; the contact point can be an arc-shaped notch, and the position of the loading frame 5 on the lever 8 is limited on the premise that the loading frame 5 can rotate relative to the lever 8; alternatively, a hinged plate is provided on the loading frame 5, which is hinged to the lever 8 via the hinged plate.
In some embodiments, in order to reduce the friction between the hinge shaft 20 and the sliding chute, a roller 21 is disposed on the hinge shaft 20, and the roller 21 slides along the sliding chute, wherein the roller 21 is disposed on both sides of the lever 8, the roller 21 is correspondingly disposed on the horizontal portions of the two L-shaped fixing plates 17, the distance between the horizontal portions of the two fixing plates 17 is adapted to the lever width, so that the lever has sufficient rotation space, and the roller 21 may also be a ball bearing.
In another alternative embodiment, the loading frame 5 is a square structure formed by combining four supporting rods, wherein the middle parts of the supporting rods above the corresponding loading plates are connected with upright posts through bolts, the upright posts point to the loading plates along the longitudinal direction, and the loading plates are provided with placing grooves corresponding to the upright posts. The loading plate 16 is provided with a placing groove corresponding to the upright column 19 to ensure that the loading position of the upright column 19 is constant, so that the accuracy of test data is improved, and in addition, the upright column 19 can not generate displacement relative to the sliding box 2 in the test process, and the placing groove is arranged at the center of the loading plate 16 to ensure the stress balance and keep the load applied to the center of the soil sample all the time. Specifically, the upright is disposed between the loading frame 5 and the loading plate, a longitudinal through hole is disposed on the support rod above the loading frame 5, and a bolt is threaded onto the upright after passing through the through hole to fix the upright and the loading frame 5, thereby ensuring stable loading.
In another alternative embodiment, a sliding rod extends out from one end of the lever far away from the weight, a balance weight 22 is slidably mounted on the sliding rod, the balance weight 22 has a certain weight, the lever can be kept horizontal in a non-loading state, and preferably, scales are arranged on the sliding rod 23 so as to calculate the actual loading weight; preferably, the counterbalance 22 is threadedly coupled to the slide rod 23 to maintain the position of the counterbalance 22 against lever rotationBitMoving; or，The balance weight is designed to determine good quality，And fixed on the sliding rod，To keep the lever balanced in the unloaded state.
In another alternative embodiment, the bolt is provided with a vertical deformation dial indicator 6 to observe the compression deformation of the loaded soil sample.
In another embodiment, studs are extended from two struts located at both sides of the loading frame 5, at least the upper ends of the studs correspondingly penetrate through the struts located at the upper side of the loading frame 5, and nuts located at the upper side and the lower side of the struts located at the upper side of the loading frame 5 are arranged on the studs, so that the longitudinal length of the loading frame 5 can be adjusted through the nuts to adapt to concrete or thixotropic slurry tests with different thicknesses.
In another alternative embodiment, the shape of the loading plate 16 is matched with the loading box 4, and the water permeable plate 15 is arranged between the loading plate 16 and the soil sample 14, so that the loading plate is prevented from being in direct contact with the soil sample, and water can be added on the loading plate to ensure the water content of the soil sample.
In an alternative embodiment, the bottom of the slide box 2 is leveled by sand 10, and a flashing 11 is placed over the sand 10, and concrete 12 is filled over the flashing 11. The waterproof board 11 is arranged to simulate a waterproof layer of a construction site, so that the site construction condition is simulated more truly, a standard test is realized, and the reliability of a test result is ensured.
In another alternative embodiment, a driving device 3 is arranged on the test bed 1, the driving device 3 acts on one side of the sliding box 2 far away from the baffle 18, and the dynamic construction process of box culvert jacking is simulated by controlling the pushing speed. The driving device 3 can be any one of an oil cylinder and an air cylinder, and the driving speed is controlled by the control valve, so that the propelling speed of the box culvert can be completely simulated, the dynamic construction process of jacking the box culvert is simulated, and the frictional resistance of the box culvert is simulated.
In an alternative embodiment, the distance between the upper surface of the thixotropic slurry 13 and the upper surface of the slide box 2 is not less than twice the thickness of the thixotropic slurry 13. The thixotropic slurry 13 is partially extruded under the action of longitudinal load, so that a certain distance is required between the slurry and the top of the sliding box 2, the problem of loss of the thixotropic slurry 13 in the experimental process is solved, the effective contact area of the concrete 12, the thixotropic slurry 13 and the soil body is the cross sectional area of the soil sample 14, and the level of a contact surface is strictly controlled in the smearing process of the thixotropic slurry 13.
In another alternative embodiment, the vertical deformation dial indicator 6 is arranged on the upright column 19 to observe the compression deformation of the loaded soil sample.
In some embodiments, a ball groove is formed on the upper surface of the test bed 1, and balls are arranged in the ball groove, at least two ball grooves are respectively corresponding to two sides of the sliding box 2 and are directed to the baffle 18, so that the friction force between the sliding box 2 and the test bed 1 is reduced; in another embodiment, a roller can be arranged above the test bed 1, and the sliding box 2 can be carried by the roller.
In another alternative embodiment, there is provided a test method for determining the frictional resistance of thixotropic slurry 13, the method comprising:
step S1, placing the sliding box 2 on the test bed 1 for simulating a field box culvert, filling concrete 12 in the sliding box 2, and smearing thixotropic slurry 13 on the surface of the concrete 12;
step S2, loading a loading device above the concrete 12 along the longitudinal direction, filling a soil sample 14 in the loading device, and enabling the soil sample 14 to be in contact with thixotropic slurry 13 so as to simulate an overlying soil body of a box culvert in the jacking construction process;
step S3, making the horizontal dynamometer 7 face the baffle plate 18 arranged on the test bed 1;
step S4, the sliding box 2 is driven to slide towards the baffle 18 along the test bed 1, the horizontal dynamometer 7 is stopped by the baffle 18, the loading device and the sliding box 2 slide relatively, and the frictional resistance between the soil sample 14 and the concrete 12 is displayed through the horizontal dynamometer 7, so that the frictional resistance between the box culvert and the overlying soil body in the jacking process of the box culvert after the thixotropic slurry 13 is injected is simulated.
In another alternative embodiment, the following detailed procedure was used for the experiments:
1) the test bed 1 is placed, a proper amount of lubricating oil is smeared in the ball grooves of the test bed 1 for lubrication, and then six balls with certain sizes are uniformly placed in each ball groove.
2) Placing sliding box 2 on the ball, carrying out the sand in sliding box 2's bottom and making level to put into waterproof board 11, avoid sliding box 2 inside follow-up packing to make level the production adverse effect to the sand, simulate the site operation condition more really, guarantee the reliability of test result.
3) The sliding box 2 is filled with concrete 12, the strength and the material of which are the same as those of the box culvert, so that the box culvert state in construction is truly simulated.
4) The thixotropic slurry 13 is uniformly coated on the surface of the concrete 12, the level of a contact surface is strictly controlled, and the distance between the surface of the thixotropic slurry 13 and the top of the sliding box 2 is not suitable to be less than 2 times of the thickness of the thixotropic slurry 13.
5) The loading box 4 is pre-filled with a soil sample 14, the soil body is to be sampled from the position of the soil body covered on the actual box culvert, the density of the soil sample 14 is the same as that of the soil body covered on the actual box culvert, the soil body actually contacted with the box culvert is truly simulated, a water permeable plate 15 is placed on the upper part of the soil sample 14, the loading box 4 is placed inside the sliding box 2, then the loading plate 16 and the loading frame 5 are placed, and the stand column 19 is placed in the placing groove above the loading plate 16.
6) The dynamometer reading is zeroed.
7) And (4) calculating the weight of the weight 9 according to the test parameters, correspondingly arranging the weight 9 on the lever 8, and simulating the overlying soil pressure of the on-site box culvert.
8) And starting a stopwatch, moving the driving device 3 at the speed of 0.8-1.2 mm/min, controlling the time within 3-5 min, and simulating the jacking speed of the box culvert. If the dynamometer reading stabilizes, or a significant rollback condition occurs, the test is terminated.
9) When the horizontal displacement of the sliding box 2 reaches 4mm, reading the reading of the dynamometer; if the reading of the dynamometer continues to increase, when the horizontal displacement of the sliding box 2 reaches 6mm, the reading of the dynamometer is read, namely the frictional resistance under the condition of smearing the thixotropic slurry 13 is measured, namely the drag reduction effect of the thixotropic slurry 13 is evaluated.
10) After the test is finished, the weights 9 and the loading box 4 are removed as soon as possible, and the soil body, the thixotropic slurry 13 and the concrete 12 are taken out so as to carry out the next test.
11) And (3) repeating the steps 1) to 10) by adopting the thixotropic slurry 13 with different proportions, so that the frictional resistance of the thixotropic slurry 13 with different proportions can be measured, and the drag reduction effect of the thixotropic slurry 13 with different proportions can be compared. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
The invention is not to be considered as limited to the particular embodiments shown, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A test device for measuring the frictional resistance of thixotropic slurry is characterized by comprising:
a test bed;
the sliding box is filled with concrete and used for simulating an on-site box culvert, and thixotropic slurry is coated on the surface of the concrete;
the loading device is loaded above the concrete along the longitudinal direction, a soil sample is filled in the loading device, and the soil sample is contacted with the thixotropic slurry so as to simulate an overlying soil body of the box culvert in the jacking construction process;
the horizontal dynamometer is horizontally and fixedly connected to the side part of the loading device, and a baffle plate facing the horizontal dynamometer is arranged on the test bed;
the sliding box is driven to slide towards the baffle along the test bed, the horizontal dynamometer is stopped by the baffle, the loading device and the sliding box slide relatively, and the frictional resistance between the soil sample and the concrete is displayed through the horizontal dynamometer, so that the frictional resistance between the box culvert and the overlying soil body in the jacking process of the box culvert is simulated under the occurrence state of thixotropic slurry.
2. The test device for measuring the frictional resistance of thixotropic slurry according to claim 1, wherein the loading device comprises a loading box and a loading plate, the loading plate is longitudinally and slidably assembled inside the loading box, and the soil sample is filled between the loading plate and the thixotropic slurry in the loading box;
the loading plate is loaded with counterweights, and the counterweights are increased and decreased so as to simulate different pressures of overlying soil bodies in the box culvert jacking process.
3. The testing device for measuring the frictional resistance of the thixotropic slurry as claimed in claim 2, wherein a loading frame shaped like a Chinese character kou is sleeved outside the test bed and the sliding box, a lever is hinged to the bottom of the test bed, and the weight is disposed on the lever so as to apply pressure to the loading frame through the lever, so that the loading frame applies pressure to the loading plate along the longitudinal direction.
4. The testing apparatus for testing the frictional resistance of thixotropic slurry as claimed in claim 3, wherein a slide carriage is disposed under the test bed and directly under the loading plate, a slide slot extending along the sliding direction of the slide box is disposed on the slide carriage, the lever is slidably mounted in the slide slot through a hinge shaft, and correspondingly, the loading frame is disposed on a side of the lever corresponding to the counterweight and close to the hinge shaft.
5. The testing device for testing the frictional resistance of thixotropic slurry according to claim 4, wherein the sliding seat comprises two L-shaped fixing plates which are oppositely arranged, a sliding groove is formed between the two L-shaped fixing plates, an ear plate extending to the position between the two L-shaped fixing plates is arranged in the middle of the lever, and the hinge shaft is arranged on the ear plate.
6. The testing device for testing the frictional resistance of thixotropic slurry according to claim 3, wherein the loading frame is a square structure formed by combining four supporting rods, wherein a column is connected to the middle part of each supporting rod above the loading plate through a bolt, the column points to the loading plate along the longitudinal direction, and a placing groove corresponding to the column is formed in the loading plate.
7. The testing apparatus for testing frictional resistance of thixotropic slurry according to claim 1, wherein the bottom of said slide box is leveled by sand, and a waterproof sheet is placed over said sand, and said concrete is filled over said waterproof sheet.
8. The test device for testing the frictional resistance of thixotropic slurry according to claim 1, wherein a driving device is arranged on the test bed, acts on one side of the sliding box far away from the baffle plate, and simulates the dynamic construction process of box culvert jacking by controlling the pushing speed.
9. The test apparatus for determining the frictional resistance of a thixotropic slurry as claimed in claim 1, wherein the distance between the upper surface of the thixotropic slurry and the upper surface of the slide box is not less than twice the thickness of the thixotropic slurry.
10. A test method for determining the frictional resistance of a thixotropic slurry, said method comprising:
step S1, placing a sliding box on a test bed for simulating an on-site box culvert, filling concrete in the sliding box for simulating the on-site box culvert, and coating thixotropic slurry on the surface of the concrete;
step S2, after filling a loading device with a soil sample, loading the loading device on the loading plate along the longitudinal direction to enable the soil sample to be in contact with the thixotropic slurry so as to simulate the overlying soil pressure of the box culvert in the jacking construction process;
step S3, the horizontal dynamometer is made to face the baffle plate arranged on the test bed;
and step S4, driving the sliding box to slide towards the baffle along the test bed, stopping the horizontal dynamometer by the baffle, enabling the loading device and the sliding box to slide relatively, and displaying the frictional resistance between the soil sample and the concrete through the horizontal dynamometer, so as to simulate the frictional resistance between the box culvert and the overlying soil body in the jacking process of the box culvert under the occurrence state of thixotropic slurry.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111308382.0A CN114216595B (en) | 2021-11-05 | 2021-11-05 | Test device and method for measuring thixotropic slurry friction resistance |
| PCT/CN2021/131546 WO2022105840A1 (en) | 2021-11-05 | 2021-11-18 | Test device and method for measuring frictional resistance of thixotropic mud |
| NL2033396A NL2033396B1 (en) | 2021-11-05 | 2022-10-26 | Test device and method for measuring frictional resistance of thixotropic mud |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN117890563A (en) * | 2024-03-12 | 2024-04-16 | 安徽建筑大学 | Rectangular jacking pipe thixotropic slurry drag reduction and fluid loss performance test system and method |
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| CN115094959B (en) * | 2022-06-24 | 2023-08-18 | 山东省路桥集团有限公司 | Horizontal simulation test device and method for side friction resistance of concrete pile |
| CN116558915A (en) * | 2023-03-20 | 2023-08-08 | 中建安装集团南方建设有限公司 | True triaxial experiment remolded soil sample preparation facilities |
| CN116858584B (en) * | 2023-07-07 | 2024-04-05 | 长沙理工大学 | Multifunctional pipe jacking model test device and test method |
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| NL2033396B1 (en) | 2024-02-02 |
| WO2022105840A1 (en) | 2022-05-27 |
| NL2033396A (en) | 2023-06-05 |
| CN114216595B (en) | 2023-04-25 |
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