A vibration compaction test device for road roller

Abstract

The invention relates to a road roller vibration compaction test device in the field of physical measurement. The compaction part simulates the hammering effect of an irregular roller on the soil surface by controlling the reciprocating speed of the power part. During the hammering process of the compaction part, air in the pores of the test sample is squeezed out from the compacted test sample and blown into the bottle body through a connecting pipe. Under the reciprocating hammering action of the compaction part, the test sample is gradually compacted, the pores of the test sample are reduced, and the pressure of the air in the air pressure bottle is increased. Therefore, the vibration compaction effect simulated by the compaction part can be quantitatively and directionally detected by the pressure detected in the air pressure bottle. When the power part completes the reciprocating motion for three consecutive times, and the pressure change measured by the air pressure sensor is less than 5% of the overall pressure change value, it is determined that the test sample is compacted to the limit. The miniaturization and precision of the experimental device can be achieved, which is convenient for the detection work of the staff.

Description

Technical Field

[0001] The invention relates to a vibration compaction test device, in particular to a road roller vibration compaction test device applied in the field of physical measurement. Background Art

[0002] Vibration compaction is a technique that places a vibrating machine on the surface of the foundation to vibrate for a certain period of time, using the shear compaction effect produced by the exciting force in the soil to evenly densify the soil within a certain depth, thereby improving the performance of the foundation. Vibration compaction by a road roller refers to the use of a road roller to pull an uneven roller to level the ground and compact the foundation to facilitate subsequent construction work.

[0003] The invention patent CN202010940647.8 specification discloses a vibration compaction experimental device and experimental method for railway coarse-grained soil filler. It adopts a continuous distance measurement method to analyze the continuous change of filler density under vibration compaction parameters; it adopts a vibration acceleration collection method to analyze the dynamic feedback of the filler under vibration compaction parameters, acceleration amplitude, and spectrum analysis to provide a basis for the optimal compaction parameters of the filler; it combines the data of density change and acceleration change for rapid real-time analysis to provide a basis for on-site construction.

[0004] In the above invention, the acceleration collection method is adopted to analyze the dynamic feedback of the filler under the vibration compaction parameters, and the acceleration collection data will decrease with the increase of the compaction degree of the sample, which will cause a large system error in the later acceleration collection. In order to avoid the above error, it is necessary to increase the size of the experimental device to facilitate the measurement of relatively accurate acceleration changes, which is not easy to miniaturize and accurately measure the experimental device. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that in order to measure relatively accurate acceleration variation, the size of the experimental device needs to be increased, which makes it difficult to miniaturize and accurately measure the experimental device.

[0006] In order to solve the above problems, the present invention provides a road roller vibration compaction test device, comprising a base 1 and a base 2 whose positions match each other, an experimental container is placed on the base 1, and an air pressure bottle is placed on the base 2, both of which are made of high-strength transparent materials, a connecting pipe is fixedly connected between the experimental container and the air pressure bottle, and the experimental container and the air pressure bottle are connected through the connecting pipe, a one-way valve is fixedly connected in the connecting pipe, and the one-way valve is for one-way flow from the experimental container to the air pressure bottle, the base 1 comprises a counterweight part, the base 2 comprises a base body, and pipe laying channels and pipe laying holes matching the connecting pipe are respectively opened on the counterweight part and the base body, and the air pressure bottle comprises a bottle body, and an air pressure sensor is fixedly connected to the inner wall of the bottle body;

[0007] The side wall of the base is fixedly connected with an auxiliary bracket, and the lower end of the auxiliary bracket is fixedly connected with a compaction power module whose position matches the experimental container. The compaction power module includes a power part fixedly connected with the auxiliary bracket, and the end of the power part away from the auxiliary bracket is fixedly connected with a compaction part matching the experimental container, and the compaction part is tightly matched with the experimental container. A pressure relief hole is drilled on the compaction part, and a sealing unit matching itself is threadedly connected to the pressure relief hole. The experimental container contains a test sample, and the end of the connecting pipe close to the auxiliary bracket is fixedly connected with a support plate, and the end of the support plate away from the connecting pipe is fixedly connected with a permeation module. The permeation module includes a metal outer ring, and the inner wall of the metal outer ring is fixedly connected with a plurality of selective permeable membranes and protective membranes. The plurality of selective permeable membranes and protective membranes are staggered, and the protective membrane is located at the uppermost end, and capillary cracks are drilled through the protective membrane and the support plate.

[0008] In the above-mentioned roller vibration compaction test device, the miniaturization and precision of the test device can be achieved, which is convenient for the detection work of the staff.

[0009] As a further improvement of the present application, the pressure cylinder includes multiple different models, that is, the volumes of the multiple different pressure cylinders are different. The pressure change of the same gas after compression during the detection process can be changed by replacing multiple pressure cylinders, which is suitable for different detection accuracy requirements.

[0010] As a further improvement of the present application, multiple reinforcing nets are embedded in the protective membrane. The multiple reinforcing nets are woven into a spider web shape. The reinforcing nets are utilized to increase the structural strength of the protective membrane, so that the protective membrane is not easily torn under the action of air pressure and is not easily to lose protection for the selectively permeable membrane.

[0011] As a further improvement of the present application, the density of the reinforcing mesh increases from the center to the outside in the selective permeable membrane, and the unit density of the reinforcing mesh in the protective membrane is uniform, which is not easy to affect the protective effect of the reinforcing mesh.

[0012] As a further improvement of the present application, multiple protective films are all made of colorless and transparent materials, and the reinforcing nets in the multiple reinforcing nets are made of different colors. The multiple reinforcing nets are all pre-stretched. The pre-stretched reinforcing nets can increase the ability to resist external pulling. At the same time, once the protective film and the reinforcing net are partially ruptured, the structure of the reinforcing net will quickly collapse and spread apart. The staff can quickly determine how many layers of the selective permeable membrane are in effect through the color change on the surface of the protective film, which is convenient for timely replacement and maintenance.

[0013] As another improvement of the present application, the upper end of the bottle body is threadedly connected to a manual adjustment module, the manual adjustment module includes a threaded rod threadedly connected to the bottle body, and the upper end of the threaded rod is located on the outside of the bottle body and is fixedly connected to a rotating handle, the lower end of the threaded rod is located in the bottle body and is fixedly provided with a push plate, the outer side of the push plate is rotatably connected to a sealing edge, the sealing edge has an interference fit with the bottle body, and scale patterns are engraved on the outer wall of the bottle body, and the position of the push plate in the bottle body can be adjusted by rotating the rotating handle, thereby adjusting the effective utilization rate of the space in the bottle body, and the use accuracy of the air pressure bottle can be quickly adjusted.

[0014] As another improved supplement of the present application, a plurality of positioning rings are fixedly connected to the inner wall of the pressure bottle, and the plurality of positioning rings are equidistantly distributed. The positions of the positioning rings are set at standard positions, so that the staff can adjust the effective volume of the bottle body to the standard volume conveniently.

[0015] As another improvement supplement to the present application, a warning strip is embedded in the sealing edge. The warning strip is located on the side of the sealing edge away from the push plate. When the warning strip is exposed, it indicates that the sealing edge is excessively worn, the push plate and the sealing edge cannot complete the separation function, and the air pressure bottle needs to be replaced and maintained.

[0016] To summarize, the present application realizes the hammering effect of the irregular roller on the soil surface by simulating the compaction part by controlling the reciprocating motion speed of the power part. During the hammering process of the compaction part, the air existing in the pores of the test sample will be squeezed out from the compacted test sample and blown into the bottle body through the connecting pipe. Under the reciprocating hammering action of the compaction part, the test sample is gradually compacted, the pores of the test sample are reduced, and the pressure of the air in the pressure bottle is increased. In unit volume, the pressure of the air is proportional to the amount of gas. Therefore, the vibration compaction effect simulated by the compaction part can be detected by quantitatively and directionally detecting the pressure detected in the pressure bottle.

[0017] During the above detection process, the air pressure sensor will monitor the air pressure in the bottle in real time, and upload the detection data to the control terminal. The control terminal establishes a coordinate system with time and pressure as coordinates, and enters the detection data into the coordinate system. The above data are connected together with a smooth curve to form a detection result graph. When the power unit completes the reciprocating motion for three consecutive times, the air pressure sensor measures a pressure change that is less than 5% of the overall pressure change value, then it is determined that the air pressure sensor has compacted the test sample to the limit during the current detection process, and the test sample cannot be further compacted, so the detection work is stopped. The technicians can judge the effect of this vibration compaction based on the data detected by the air pressure sensor and its change law, and reasonably select the optimal vibration compaction method and working time. Compared with the prior art, the present application can realize the miniaturization and precision of the experimental device, which is convenient for the detection work of the staff.

[0018] In addition, the position of the push plate on the bottle body can be adjusted by turning the handle, thereby adjusting the effective utilization rate of the space in the bottle body. The accuracy of the pressure bottle can be quickly adjusted. However, the continuous adjustment of the manual adjustment module will also lead to an increase in the system error itself, requiring regular calibration, or the pressure bottle should only be used in low-precision detection experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a road roller vibration compaction test device according to a first embodiment of the present application;

[0020] Figure 2 A front cross-sectional view of a road roller vibration compaction test device according to a first embodiment of the present application;

[0021] Figure 3 for Figure 2 The structural diagram at A in the middle;

[0022] Figure 4 This is a schematic structural diagram of a base 1 and an auxiliary bracket according to a first embodiment of the present application;

[0023] Figure 5 This is a schematic structural diagram of the base 2 according to the first embodiment of the present application;

[0024] Figure 6 This is a schematic structural diagram of a plurality of gas pressure bottle groups according to a first embodiment of the present application;

[0025] Figure 7 A side cross-sectional view of an infiltration module according to a first embodiment of the present application;

[0026] Figure 8 This is a schematic structural diagram of a protective film according to a first embodiment of the present application;

[0027] Fig. 9 This is a schematic structural diagram of a road roller vibration compaction test device according to a second embodiment of the present application;

[0028] Fig.10 This is a front cross-sectional view of the air pressure bottle according to the second embodiment of the present application.

[0029] Description of the numbers in the figure:

[0030] 1 base one, 101 counterweight part, 102 pipe laying channel, 2 base two, 201 base body, 202 pipe laying hole, 3 auxiliary bracket, 4 experimental container, 5 pressure bottle, 501 bottle body, 502 pressure sensor, 503 positioning ring, 6 compaction power module, 601 power part, 602 compaction part, 603 pressure relief hole, 604 sealing unit, 7 connecting pipe, 8 one-way valve, 9 permeation module, 901 metal outer ring, 902 selective permeable membrane, 903 protective membrane, 904 strengthening net, 10 support plate, 11 manual adjustment module, 1101 rotating handle, 1102 threaded rod, 1103 push plate, 1104 sealing edge, 1105 warning strip, 12 test sample. DETAILED DESCRIPTION

[0031] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0032] The first implementation method:

[0033] Figure 1-5 and Figure 7 A road roller vibration compaction test device is shown, comprising a base 1 and a base 2 which are matched in position, an experimental container 4 is placed on the base 1, and an air pressure bottle 5 is placed on the base 2. Both the experimental container 4 and the air pressure bottle 5 are made of high-strength transparent materials, a connecting pipe 7 is fixedly connected between the experimental container 4 and the air pressure bottle 5, and the experimental container 4 and the air pressure bottle 5 are connected through the connecting pipe 7, a one-way valve 8 is fixedly connected in the connecting pipe 7, and the one-way valve 8 is for one-way flow from the experimental container 4 to the air pressure bottle 5, the base 1 comprises a counterweight 101, the base 2 comprises a base body 201, and the counterweight 101 and the base body 201 are respectively provided with a pipe laying channel 102 and a pipe laying hole 202 which match the connecting pipe 7, the air pressure bottle 5 comprises a bottle body 501, and an air pressure sensor 502 is fixedly connected to the inner wall of the bottle body 501;

[0034] The side wall of the base 1 is fixedly connected with an auxiliary bracket 3, and the lower end of the auxiliary bracket 3 is fixedly connected with a compaction power module 6 positioned to match the experimental container 4. The compaction power module 6 includes a power part 601 fixedly connected with the auxiliary bracket 3, and one end of the power part 601 away from the auxiliary bracket 3 is fixedly connected with a compaction part 602 matching the experimental container 4, and the compaction part 602 is tightly matched with the experimental container 4. A pressure relief hole 603 is drilled on the compaction part 602, and a sealing unit 604 matching itself is connected to the inner thread of the pressure relief hole 603. The test container 4 contains a test sample 12, and one end of the connecting tube 7 close to the auxiliary bracket 3 is fixedly connected to the support plate 10, and the other end of the support plate 10 away from the connecting tube 7 is fixedly connected to the permeation module 9. The permeation module 9 includes a metal outer ring 901, and the inner wall of the metal outer ring 901 is fixedly connected to a plurality of selective permeable membranes 902 and a protective membrane 903. The plurality of selective permeable membranes 902 and the protective membrane 903 are staggered, and the protective membrane 903 is located at the uppermost end. The protective membrane 903 and the support plate 10 are both provided with penetrating capillary cracks.

[0035] In particular, for the convenience of display, the sizes and shapes of various structures in the present application are not drawn strictly in proportion. Those skilled in the art can reasonably design the sizes and shapes of various structures according to actual usage. At the same time, a control terminal is installed in the auxiliary bracket 3, and the control terminal can control the working status of electrical structures such as the auxiliary bracket 3 and the air pressure sensor 502, and the operator can interact and complete the above-mentioned operation process through the control terminal. The settings, controls and connection methods in the control terminal are well-known technologies to those skilled in the art, and therefore are not disclosed in detail in this application.

[0036] Before the work of this application, the staff collects the test sample 12 in the construction area and puts it into the test sample 12, wherein the test sample 12 is a surface block soil sample collected as a whole, to reduce the porosity change of the test sample 12 caused by the collection and reduce the impact on the test result. Before starting the test, the sealing unit 604 is pulled out and the compaction part 602 is moved to the upper surface of the test sample 12, and then the sealing unit 604 is screwed back into the pressure relief hole 603 to complete the sealing. Finally, the air pressure sensor 502 measures the pressure in the bottle body 501 and records it as the initial pressure, completing the preparation work.

[0037] The power unit 601 is started to drive the compaction unit 602 to reciprocate in the experimental container 4 to hammer the surface of the test sample 12. The compaction unit 602 can simulate the hammering effect of the irregular roller on the soil surface by controlling the reciprocating speed of the power unit 601. During the hammering process of the compaction unit 602, the air in the pores of the test sample 12 is squeezed out from the compacted test sample 12 and pumped into the bottle body 501 through the connecting pipe 7. The presence of the penetration module 9 can make the test sample 12 The fragments produced by the lower fragmentation are not easy to enter the connecting pipe 7 and are not easy to affect the detection results. The support plate 10 protects the permeation module 9, making it difficult for the permeation module 9 to fail due to excessive deformation. Under the reciprocating hammering action of the compaction part 602, the test sample 12 is gradually compacted, and the pores of the test sample 12 are reduced, and the pressure of the air in the pressure bottle 5 is increased. In unit volume, the pressure of the air is proportional to the amount of gas. Therefore, the vibration compaction effect simulated by the compaction part 602 can be detected by quantitatively and directionally detecting the pressure detected in the pressure bottle 5.

[0038] During the above detection process, the air pressure sensor 502 will monitor the air pressure in the bottle body 501 in real time, and upload the detected data to the control terminal. The control terminal establishes a coordinate system with time and pressure as coordinates, enters the detection data into the coordinate system, and connects the above data with a smooth curve to form a detection result graph. When the power unit 601 completes the reciprocating motion for three consecutive times, the air pressure sensor 502 measures a pressure change that is less than 5% of the overall pressure change value, then it is determined that the air pressure sensor 502 has compacted the test sample 12 to the limit during the current detection process, and the test sample 12 cannot be further compacted, so the detection work is stopped. The technicians can judge the effect of this vibration compaction based on the data detected by the air pressure sensor 502 and its change law, and reasonably select the optimal vibration compaction method and working time. Compared with the prior art, the present application can realize the miniaturization and precision of the experimental device, which is convenient for the detection work of the staff.

[0039] See also Figure 6 The pressure bottle 5 includes multiple different models, that is, the volumes of the multiple different pressure bottles 5 are different. The pressure change of the same gas after compression during the detection process can be changed by replacing multiple pressure bottles 5, which is suitable for different detection accuracy requirements.

[0040] See also Figure 7-8A plurality of reinforcing nets 904 are embedded in the protective film 903, and the plurality of reinforcing nets 904 are woven into a spider web shape. The reinforcing nets 904 are utilized to increase the structural strength of the protective film 903, so that the protective film 903 is not easily torn under the action of air pressure, and is not easily to lose the protection of the selectively permeable membrane 902. The density of the reinforcing nets 904 increases from the center of the circle toward the outside in the selectively permeable membrane 902, and the unit density of the reinforcing nets 904 in the protective film 903 is uniform, which is not easy to affect the protective effect of the reinforcing nets 904.

[0041] The multiple protective films 903 are all made of colorless and transparent material, and the reinforcing nets 904 in the multiple reinforcing nets 904 are of different colors. The multiple reinforcing nets 904 are all pre-stretched. The pre-stretched reinforcing nets 904 can increase the ability to resist external pulling. At the same time, once the protective film 903 and the reinforcing net 904 are partially ruptured, the structure of the reinforcing net 904 will quickly collapse and spread apart. The staff can quickly determine how many layers of the effective selective permeable membrane 902 are left through the color change on the surface of the protective film 903, so as to facilitate timely replacement and maintenance.

[0042] The second implementation method:

[0043] Figure 9-10 The pressure bottle 5 is shown, and the upper end of the bottle body 501 is threadedly connected with a manual adjustment module 11, and the manual adjustment module 11 includes a threaded rod 1102 threadedly connected with the bottle body 501, and the upper end of the threaded rod 1102 is located at the outside of the bottle body 501 and is fixedly connected with a rotating handle 1101, and the lower end of the threaded rod 1102 is located in the bottle body 501 and is fixed with a push plate 1103, and the outer side of the push plate 1103 is rotatably connected with a sealing edge 1104, and the sealing edge 1104 is interference fit with the bottle body 501, and the outer wall of the bottle body 501 is engraved with scale lines, which intersect with the first embodiment. In this embodiment, the position of the push plate 1103 in the bottle body 501 can be adjusted by rotating the rotating handle 1101, thereby adjusting the effective utilization rate of the space in the bottle body 501. The accuracy of the pressure bottle 5 can be quickly adjusted, but the continuous adjustment of the manual adjustment module 11 will also lead to an increase in the system error itself, requiring regular calibration, or the pressure bottle 5 is only used in low-precision detection tests.

[0044] A plurality of positioning rings 503 are fixedly connected to the inner wall of the air pressure bottle 5, and the plurality of positioning rings 503 are equidistantly distributed. The positioning rings 503 are set at standard positions to facilitate the staff to adjust the effective volume of the bottle body 501 to the standard volume. A warning strip 1105 is embedded in the sealing edge 1104, and the warning strip 1105 is located on the side of the sealing edge 1104 away from the push plate 1103. When the warning strip 1105 is exposed, it indicates that the sealing edge 1104 is excessively worn, and the push plate 1103 and the sealing edge 1104 cannot complete the separation function, and the air pressure bottle 5 needs to be replaced and maintained.

[0045] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A road roller vibration compaction test device, comprising a base 1 (1) and a base 2 (2) whose positions match each other, characterized in that: An experimental container (4) is placed on the base one (1), and an air pressure bottle (5) is placed on the base two (2). The experimental container (4) and the air pressure bottle (5) are both made of a high-strength transparent material. A connecting pipe (7) is fixedly connected between the experimental container (4) and the air pressure bottle (5), and the experimental container (4) and the air pressure bottle (5) are connected via the connecting pipe (7). A one-way valve (8) is fixedly connected inside the connecting pipe (7). The one-way valve (8) is One-way flow from the experimental container (4) to the air pressure bottle (5), the base one (1) includes a counterweight portion (101), the base two (2) includes a base body (201), the counterweight portion (101) and the base body (201) are respectively provided with a pipe laying channel (102) and a pipe laying hole (202) matching the connecting pipe (7), the air pressure bottle (5) includes a bottle body (501), and an air pressure sensor (502) is fixedly connected to the inner wall of the bottle body (501); The side wall of the base 1 (1) is fixedly connected to an auxiliary bracket (3), and the lower end of the auxiliary bracket (3) is fixedly connected to a compaction power module (6) located and matched with the experimental container (4). The compaction power module (6) comprises a power part (601) fixedly connected to the auxiliary bracket (3), and one end of the power part (601) away from the auxiliary bracket (3) is fixedly connected to a compaction part (602) matching with the experimental container (4), and the compaction part (602) is tightly matched with the experimental container (4). A pressure relief hole (603) is drilled on the compaction part (602), and a sealing unit (604) matching with the pressure relief hole (603) is connected to the inner thread of the pressure relief hole (603). The test container (4) contains a test sample (12); one end of the connecting tube (7) close to the auxiliary bracket (3) is fixedly connected to a support plate (10); one end of the support plate (10) away from the connecting tube (7) is fixedly connected to a permeation module (9); the permeation module (9) comprises a metal outer ring (901); the inner wall of the metal outer ring (901) is fixedly connected to a plurality of selective permeable membranes (902) and protective membranes (903); the plurality of selective permeable membranes (902) and protective membranes (903) are arranged in an alternating manner, and the protective membrane (903) is located at the top; and capillary cracks penetrating the protective membrane (903) and the support plate (10) are bored.

2. A road roller vibration compaction test device according to claim 1, characterized in that: The gas pressure bottles (5) include a plurality of different models, that is, the volumes of the plurality of different gas pressure bottles (5) are different.

3. The vibration compaction test device for a road roller according to claim 1, characterized in that: A plurality of reinforcing nets (904) are embedded in the protective film (903), and the plurality of reinforcing nets (904) are woven into a spider web shape.

4. A road roller vibration compaction test device according to claim 3, characterized in that: The density of the reinforcing mesh (904) increases from the center of the circle toward the outside in the selective permeable membrane (902).

5. A road roller vibration compaction test device according to claim 4, characterized in that: The plurality of protective films (903) are all made of a colorless and transparent material, and the reinforcing nets (904) in the plurality of protective films (903) are made of different colors, and the plurality of reinforcing nets (904) are all pre-stretched.

6. A road roller vibration compaction test device according to claim 1, characterized in that: The upper end of the bottle body (501) is threadedly connected to a manual adjustment module (11), the manual adjustment module (11) comprising a threaded rod (1102) threadedly connected to the bottle body (501), the upper end of the threaded rod (1102) being located outside the bottle body (501) and fixedly connected to a rotating handle (1101), the lower end of the threaded rod (1102) being located inside the bottle body (501) and fixedly connected to a push plate (1103), the outer side of the push plate (1103) being rotatably connected to a sealing edge (1104), the sealing edge (1104) being interference fit with the bottle body (501), and the outer wall of the bottle body (501) being engraved with scale lines.

7. A road roller vibration compaction test device according to claim 6, characterized in that: A plurality of positioning rings (503) are fixedly connected to the inner wall of the air pressure bottle (5), the plurality of positioning rings (503) are distributed at equal intervals, and the positions of the positioning rings (503) are set at standard positions.

8. The vibration compaction test device for a road roller according to claim 6, characterized in that: A warning strip (1105) is embedded in the sealing edge (1104), and the warning strip (1105) is located on a side of the sealing edge (1104) away from the push plate (1103).

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