CN213544297U

CN213544297U - Self-compaction solidified soil contractility testing arrangement

Info

Publication number: CN213544297U
Application number: CN202022143857.2U
Authority: CN
Inventors: 孔恒; 郭飞; 张丽丽; 王杰; 王璐; 姜瑜; 付晓健; 孙博通; 鲁赟; 齐立勇; 李振坤
Original assignee: Beijing Municipal Construction Co Ltd; Beijing High Tech Municipal Engineering Technology Co Ltd
Current assignee: Beijing Municipal Construction Co Ltd; Beijing High Tech Municipal Engineering Technology Co Ltd
Priority date: 2020-09-25
Filing date: 2020-09-25
Publication date: 2021-06-25
Anticipated expiration: 2030-09-25

Abstract

The application relates to a self-compacting solidified soil contractility testing device, which comprises a testing platform, a mounting frame, a testing head, a displacement measuring mechanism and a placing disc, wherein the testing platform is hollow inside, the mounting frame comprises a mounting plate and a mounting head, the mounting plate is vertically and fixedly connected to the testing platform, the mounting head is fixedly connected to the top end of the mounting plate, the testing head is fixedly connected to the mounting head, the direction of the testing head is vertical downwards, and a pressure sensor is fixedly connected to the bottom end of the testing head; displacement measurement mechanism includes driving piece, telescopic link and displacement sensor, the driving piece can drive the telescopic link is followed vertical direction and is moved, it is in to place a rigid coupling the telescopic link top, displacement sensor can measure the motion displacement of telescopic link, place and to place the sample mould in the dish, solidification soil can be placed in the sample mould, the test head can stretch into contact with solidification soil in the sample mould. This application has the effect of measuring self-compaction solidification soil shrinkage.

Description

Self-compaction solidified soil contractility testing arrangement

Technical Field

The application relates to the technical field of material performance testing, in particular to a self-compacting solidified soil contractility testing device.

Background

The self-compacting solidified soil is widely applied to the backfilling of special roadbeds as a high-fluidity and self-compacting backfilling material.

The subgrade is used as a basic part of a road composition, the performance requirements on the subgrade backfill material in the actual engineering are usually met according to local conditions, particularly in the subgrade extension engineering, the shrinkage deformation value of the subgrade backfill material is considered, if the shrinkage deformation value of the material is too large, large shrinkage cracks can be generated after the engineering, and the diseases of settlement, damage and the like of an upper structure are caused.

In order to meet the construction fluidity of newly-mixed self-compacting solidified soil in actual engineering, the design of the mix proportion of self-compacting backfill materials usually adopts a high water-cement ratio or water-cement ratio to obtain good fluidity, the water consumption in the mixed materials is large, excessive free water exists in the form of free water, and after the self-compacting solidified soil is filled, along with the evaporation, reaction and loss of water, some dry shrinkage phenomena can occur, so that soil body cracking is caused, and once the soil body cracks, the durability, long-term mechanical property, integrity and aesthetic property (apparent quality) of the soil body are greatly weakened, so that the determination of the shrinkage deformation value of the self-compacting solidified soil is very necessary for meeting the construction requirements and ensuring the engineering quality.

SUMMERY OF THE UTILITY MODEL

In order to realize the measurement of self-compaction solidification soil contractibility, this application provides a self-compaction solidification soil contractibility testing arrangement.

The application provides a self-compaction solidification soil contractility testing arrangement adopts following technical scheme:

a self-compacting solidified soil contractility testing device comprises a testing system, wherein the testing system comprises a testing platform, a mounting frame, a testing head, a displacement measuring mechanism and a placing disc;

the mounting frame comprises a mounting plate and a mounting head, the mounting plate is vertically and fixedly connected to the test platform, and the mounting head is fixedly connected to the top end of the mounting plate;

the testing head is fixedly connected to the mounting head and faces vertically downwards, and a pressure sensor is fixedly connected to the bottom end of the testing head;

the displacement measuring mechanism comprises a driving piece, a telescopic rod and a displacement sensor, the driving piece is fixedly connected to the test platform, and the driving piece can drive the telescopic rod to move along the vertical direction;

the placing disc is fixedly connected to the top end of the telescopic rod, and the displacement sensor can measure the movement displacement of the telescopic rod;

place and place the sample mould in the dish, the solidification soil can be placed in the sample mould, the test head can stretch into contact with the solidification soil in the sample mould.

By adopting the technical scheme, during testing, the solidified soil to be tested is firstly placed in the sample mold, then the driving piece is driven to drive the telescopic rod to move upwards until the surface layer of the solidified soil is contacted with the pressure sensor on the testing head, and the reading of the pressure sensor is larger than zero; setting a test period (taking 60 days as an example), then enabling the pressure sensor and the grating ruler to be in an equal working state, enabling the solidified soil to have two shrinkage processes in the test period, namely shrinkage during solidification and shrinkage after solidification, enabling the pressure sensor to be separated from the gasket in the two shrinkage processes, namely enabling the reading of the pressure sensor to be zero, programming the pressure sensor and the driving piece before testing to achieve the purpose that when the reading of the pressure sensor is zero, the driving piece can drive the telescopic rod to continue to move upwards, so that the pressure sensor is always in contact with the solidified soil surface layer when the solidified soil is solidified and shrunk, and preferably, when the pressure sensor is in contact with the solidified soil surface layer, the displayed reading is larger than zero and smaller than one, and after the test period is finished, the distance of upward movement of the telescopic rod of the displacement sensor can be recorded and displayed on a computer, the distance is the shrinkage of the solidified soil, and a relation curve of the shrinkage of the solidified soil and the test period can be generated on the computer at the moment, so that the shrinkage of the solidified soil can be known.

Preferably, the device further comprises a computer, and the pressure sensor, the driving member and the displacement sensor are electrically connected with the computer.

By adopting the technical scheme, the computer can simultaneously control the pressure sensor, the driving piece and the displacement sensor to work, and can automatically generate a relation curve of the shrinkage of the solidified soil and the test period.

Preferably, a gasket is arranged in the sample mold, the gasket is placed on the surface layer of solidified soil, and the pressure sensor is abutted to the gasket.

Through adopting above-mentioned technical scheme, the gasket can prevent in pressure sensor inserts the solidification soil, has also kept the roughness on solidification soil top layer simultaneously for the accuracy of test result is higher.

Preferably, the gasket is provided with a plurality of air holes.

Through adopting above-mentioned technical scheme, the gas permeability of the native of multiplicable solidification of bleeder vent to make the gasket can not influence the solidification of solidification soil, so that final test result is more accurate.

Preferably, the telescopic link is close to the one end rigid coupling of placing the dish has the bellows weighing sensor, the bellows weighing sensor with the computer electricity is connected, it establishes to place the dish pressure on the bellows weighing sensor.

Through adopting above-mentioned technical scheme, solidification soil accessible capsule weighing sensor records weight and demonstrates weight parameter on data display before the test, and solidification soil solidification shrink can be lost by some moisture evaporation during the test, and after the test cycle, weight parameter on the data display can reduce, and the numerical value that should reduce then is the moisture loss of solidification soil, then can produce the relation curve of shrinkage and water content of this solidification soil on the computer.

Preferably, the test platform bottom surface is equipped with leveling structure, leveling structure is including adjusting pole and fixing base, adjust the pole with test platform bottom surface threaded connection, the fixing base sets up adjust the pole and keep away from test platform's one end and with it rotates to adjust the pole and is connected, it twists the head to cup joint on the pole.

Through adopting above-mentioned technical scheme, can finely tune test platform's levelness through rotating the regulation pole to realize test platform's levelness and adjust, so that the test of solidification soil shrinkage is more accurate.

Preferably, a bubble level gauge is placed on the test platform.

Through adopting above-mentioned technical scheme, the levelness when bubble spirit level can improve test platform fine setting.

Preferably, the bubble level gauge is embedded in the placing groove.

Through adopting above-mentioned technical scheme, the standing groove can make bubble spirit level embedding test platform to make the bubble spirit level can not show prominently on test platform, practice thrift test platform's space utilization.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the testing device can simultaneously realize the shrinkage test of the solidified soil and the relation between the shrinkage of the solidified soil and the water content, and the testing process can be more automated through the matching of the testing system and the computer;

2. through the arrangement of the diaphragm capsule weighing sensor, the solidified soil can be measured by the diaphragm capsule weighing sensor before being tested, and weight parameters are displayed on the data display screen, the solidified soil is evaporated and lost by a part of water during testing, the weight parameters on the data display screen are reduced after the testing period is finished, the reduced value is the water loss of the solidified soil, and then a relation curve of the shrinkage and the water content of the solidified soil can be produced on a computer;

3. the levelness of the test platform can be finely adjusted by rotating the adjusting rod so as to adjust the levelness of the test platform, and meanwhile, the levelness of the test platform can be further improved by matching with the bubble level meter.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present application.

Fig. 2 is a schematic diagram for showing an internal structure of a test platform according to an embodiment of the present application.

Fig. 3 is a partially enlarged schematic view of a portion a in fig. 1.

Fig. 4 is a partially enlarged schematic view of a portion B in fig. 1.

Description of reference numerals: 1. a test platform; 11. a placement groove; 2. a mounting frame; 21. mounting a plate; 22. a mounting head; 23. a data display screen; 3. a test head; 31. a pressure sensor; 4. a displacement measuring mechanism; 41. a push rod motor; 42. a telescopic rod; 421. a capsule weighing sensor; 43. a grating scale; 431. a main scale; 432. a reading head; 5. placing a tray; 51. a sample mold; 511. an arc-shaped sheet; 512. mounting lugs; 52. a gasket; 521. air holes are formed; 6. a computer; 7. leveling the structure; 71. adjusting a rod; 711. screwing the head; 72. a fixed seat; 8. a bubble level.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

Example (b):

the embodiment of the application discloses a self-compacting solidified soil contractility testing device, and the device comprises a testing system and a computer 6, and is referred to fig. 1.

The test system comprises a test platform 1, a mounting frame 2, a test head 3, a displacement measuring mechanism 4 and a placing disc 5.

The test platform 1 is hollow inside and is horizontally placed when in use, and the test platform is used as a mounting platform of the whole test system.

The mounting frame 2 comprises a mounting plate 21 and a mounting head 22, wherein the mounting plate 21 is vertically and fixedly connected with the edge of one side of the upper surface of the test platform 1; the mounting head 22 is hollow and horizontally fixed on the top end of the mounting plate 21 and located right above the testing platform 1, and a data display screen 23 is mounted on the end face of the mounting head 22 far away from one end of the mounting plate 21.

The testing head 3 is rectangular and vertically fixed at one end of the lower surface of the mounting head 22 close to the data display screen 23, one end of the testing head 3 far away from the mounting head 22 is fixedly connected with a pressure sensor 31, and the pressure sensor 31 is electrically connected with the computer 6.

Referring to fig. 1 and 2, displacement measurement mechanism 4 includes push rod motor 41, telescopic link 42 and grating chi 43, push rod motor 41 is as driving piece rigid coupling in test platform 1 and the output direction is vertical up, the through-hole has been seted up to test platform 1 upper surface, telescopic link 42 wears to establish in the through-hole and the coaxial rigid coupling of one end and push rod motor 41's output, the other end of telescopic link 42 then wears out test platform 1 upper surface, telescopic link 42's the end rigid coupling that wears out has bellows weighing sensor 421, bellows weighing sensor 421 is connected with data display 23 electricity, it sets up on bellows weighing sensor 421 to place dish 5 pressure, it is uncovered to place the inside cavity of dish 5 and top surface, this department is used for placing the solidification soil that awaits measuring.

The main scale 431 of the grating scale 43 is vertically and fixedly connected to the position, close to the telescopic rod 42, of the testing platform 1, the reading head 432 of the grating scale 43 is fixedly connected to the telescopic rod 42, the reading head 432 and the main scale 431 of the grating scale 43 are electrically connected with the computer 6, and the movement displacement of the telescopic rod 42 can be measured through the matching of the reading head 432 of the grating scale 43 and the main scale 431.

Referring to fig. 1 and 3, place the sample mould 51 that is used for holding solidification soil on the dish 5, sample mould 51 is a cylindrical sleeve that comprises two arcs 511, border at two arcs 511 docks respectively integrated into one piece has installation ear 512, the through-hole has been seted up at equal interval on every installation ear 512, dock back two arcs 511, utilize the bolt to pass the through-hole on the installation ear 512, rethread nut and bolt cooperation screw up can, only need the pine bolt to open two arcs 511 during the drawing of patterns, and is swift convenient.

The whole sample mould 51 is made of organic glass, and a layer of polyvinyl chloride plastic film is paved on the inner wall, so that the friction between the sample mould 51 and the solidified soil can be reduced, the solidified soil can be more freely contracted during testing, and the testing accuracy is improved.

After the solidified soil is put into the sample mold 51, a gasket 52 is placed on the surface layer of the solidified soil, a plurality of air holes 521 are formed in the gasket 52 to increase the air permeability of the solidified soil, and the pressure sensor 31 on the test head 3 is in contact with the gasket 52 when in use.

Referring to fig. 1 and 4, in order to make the testing platform 1 more horizontal when in use, it may be further configured that: the bottom surface of the testing platform 1 is provided with a leveling structure 7, the leveling structure 7 comprises an adjusting rod 71 and a fixed seat 72, the adjusting rod 71 is a threaded rod, the bottom surface of the testing platform 1 is provided with one adjusting rod 71 and one adjusting seat 72, the adjusting rod 71 is in threaded connection with the bottom surface of the testing platform 1, the fixed seat 72 can serve as a support of the testing platform 1, the support is arranged on each adjusting rod 71, a jack is formed in the surface of the fixed seat 72, one end, far away from the testing platform 1, of the adjusting rod 71 can be inserted into the jack and is connected with the fixed seat 72 in a rotating mode through a bearing, the levelness of the testing platform 1 can be finely adjusted by rotating the adjusting rod 71 during use, the adjusting rod 71 is rotated conveniently, and a twisting head 711 is coaxially.

In order to improve the levelness of the test platform 1 during fine adjustment, a placing groove 11 can be formed in the upper surface of the test platform 1, a bubble level meter 8 is embedded into the placing groove 11, and the adjustment levelness of the test platform 1 can be judged by observing the bubble level meter 8 during fine adjustment.

The implementation principle of the self-compacting solidified soil contractility testing device in the embodiment of the application is as follows: during testing, the testing platform 1 is leveled, then the solidified soil to be tested is placed in the sample die 51, the gasket 52 is placed on the surface layer of the solidified soil, then the push rod motor 41 is driven to drive the telescopic rod 42 to move upwards until the gasket 52 is contacted with the pressure sensor 31 on the testing head 3, and at the moment, the reading of the pressure sensor 31 is larger than zero; setting a test period (taking 60 days as an example), then enabling the pressure sensor 31, the bellows weighing sensor 421 and the grating ruler 43 to be in a uniform working state, wherein the solidified soil has two shrinkage processes, namely shrinkage during solidification and shrinkage after solidification, and the two shrinkage processes can separate the pressure sensor 31 from the gasket 52, namely the indication number of the pressure sensor 31 is zero, and at this time, the gasket 52 needs to be moved up to be contacted with the pressure sensor 31 again, so that the pressure sensor 31 and the push rod motor 41 need to be programmed before the test, so that when the indication number of the pressure sensor 31 approaches zero, the push rod motor 41 can drive the telescopic rod 42 to continue to move upwards, so that the pressure sensor 31 is always contacted with the gasket 52 when the solidified soil is solidified and shrunk, it is preferable that the indication number displayed when the pressure sensor 31 is contacted with the gasket 52 is greater than zero and less than one, after the testing period is finished, the grating ruler 43 can record the upward movement distance of the telescopic rod 42 and display the upward movement distance on the computer 6, the distance is the shrinkage of the solidified soil, and at the moment, a relation curve between the shrinkage of the solidified soil and the testing period can be generated on the computer 6, so that the shrinkage of the solidified soil can be known.

The solidified soil can be measured by the capsule weighing sensor 421 before the test, and the weight parameter is displayed on the data display screen 23, the solidified soil can be lost by evaporation of a part of water during the test, after the test period is finished, the weight parameter on the data display screen 23 can be reduced, the reduced value is the water loss of the solidified soil, and then a relation curve of the shrinkage and the water content of the solidified soil can be produced on the computer 6.

Adopt this embodiment, through this testing arrangement, can realize the contractility test of solidification soil simultaneously to and the relation of the shrinkage and the water content of solidification soil, and cooperate through above-mentioned test system and computer 6, make the test procedure also more automatic.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a self-compaction solidification soil contractility testing arrangement which characterized in that: the device comprises a test system, wherein the test system comprises a test platform (1), a mounting frame (2), a test head (3), a displacement measuring mechanism (4) and a placing disc (5);

the mounting frame (2) comprises a mounting plate (21) and a mounting head (22), the mounting plate (21) is vertically and fixedly connected to the test platform (1), and the mounting head (22) is fixedly connected to the top end of the mounting plate (21);

the testing head (3) is fixedly connected to the mounting head (22) and faces vertically downwards, and a pressure sensor (31) is fixedly connected to the bottom end of the testing head (3);

the displacement measuring mechanism (4) comprises a driving piece, a telescopic rod (42) and a displacement sensor, the driving piece is fixedly connected to the test platform (1), and the driving piece can drive the telescopic rod (42) to move along the vertical direction;

the placing disc (5) is fixedly connected to the top end of the telescopic rod (42), and the displacement sensor can measure the movement displacement of the telescopic rod (42);

a sample mould (51) is placed in the placing disc (5), solidified soil is placed in the sample mould (51), and the test head (3) can extend into the sample mould (51) to be in contact with the solidified soil.

2. The self-compacting solidified soil contractility testing apparatus according to claim 1, wherein: the testing device comprises a computer (6), and the pressure sensor (31), the driving piece and the displacement sensor are all electrically connected with the computer (6).

3. The self-compacting solidified soil contractility testing apparatus according to claim 1, wherein: a gasket (52) is arranged in the sample die (51), the gasket (52) is placed on the surface layer of solidified soil, and the pressure sensor (31) is abutted to the gasket (52).

4. The self-compacting solidified soil contractility testing apparatus according to claim 3, wherein: the gasket (52) is provided with a plurality of air holes (521).

5. The self-compacting solidified soil contractility testing apparatus according to claim 2, wherein: telescopic link (42) are close to the one end rigid coupling of placing dish (5) has bellows weighing sensor (421), bellows weighing sensor (421) with computer (6) electricity is connected, it establishes to place dish (5) pressure on bellows weighing sensor (421).

6. The self-compacting solidified soil contractility testing apparatus according to claim 1, wherein: test platform (1) bottom surface is equipped with leveling structure (7), leveling structure (7) are including adjusting pole (71) and fixing base (72), adjust pole (71) with test platform (1) bottom surface threaded connection, fixing base (72) set up adjust pole (71) and keep away from test platform (1) one end and with adjust pole (71) and rotate and connect, it twists first (711) to have cup jointed on adjusting pole (71).

7. The self-compacting solidified soil contractility testing apparatus according to claim 1, wherein: and a bubble level meter (8) is arranged on the test platform (1).

8. The self-compacting solidified soil contractility testing apparatus according to claim 7, wherein: a placing groove (11) is formed in the testing platform (1), and the bubble level meter (8) is embedded in the placing groove (11).