CN111502679A - Simulation shield constructs blade disc mud cake and forms device - Google Patents
Simulation shield constructs blade disc mud cake and forms device Download PDFInfo
- Publication number
- CN111502679A CN111502679A CN202010426982.6A CN202010426982A CN111502679A CN 111502679 A CN111502679 A CN 111502679A CN 202010426982 A CN202010426982 A CN 202010426982A CN 111502679 A CN111502679 A CN 111502679A
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- CN
- China
- Prior art keywords
- cutter head
- mud
- mud cake
- cylinder wall
- transparent cylinder
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/093—Control of the driving shield, e.g. of the hydraulic advancing cylinders
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/008—Subject matter not provided for in other groups of this subclass by doing functionality tests
Abstract
The invention provides a device for simulating formation of a shield cutter disc mud cake, which comprises a driving motor, a sensor group, a support frame, a mud inlet pipe, a transparent cylinder wall, a bottom plate, a jack, a reinforcing plate, an operating platform, a driving main shaft, a spring rod, a cutter disc, a heating device, a metal probe and a base cover. And during the simulation test, soil is added from the mud inlet pipe, the cutter head starts to rotate downwards after being heated to simulate the tunneling of the cutter head, and the metal probe retracts when the stress exceeds the pretightening force, so that the formation of a mud cake is proved. The invention can intuitively simulate the process of the cutter disc mud cake and creates conditions for researching the relation between the cutter disc mud cake forming and the temperature, pressure and pressurizing time of the cutter disc.
Description
Technical Field
The invention belongs to the technical field of shield model tests of underground engineering, and particularly relates to a device for forming a mud cake of a simulated shield cutter head.
Background
With the development of modernization, the construction of underground engineering becomes the focus of urban construction, which puts higher requirements on the quality and quantity of tunnel construction. At present, the shield machine is widely applied to the construction of underground tunnels and obtains good economic and social benefits, but the geological conditions of shield tunneling are complex, mud cakes are easily generated on a tunneling cutter head in certain strata with large clay and silt content, the cutting capability of the cutter head is weakened, the mud cakes can also block the discharge of the silt, and huge economic loss is caused to the shield tunneling construction.
In order to solve the problems, the mud cake formation phenomenon of the cutter head needs to be researched, and the influence of the forming process of the mud cake and external conditions on the mud cake is known. However, because the shield construction working environment is severe, personnel are difficult to pass through and the test cannot be carried out on site, the process of forming the mud cake of the shield cutter head can only be simulated through an indoor test, so that the factors for forming the mud cake and the prevention treatment method are researched.
The scholars have conducted many researches on the mud cake phenomenon and built many test devices, but the researches are basically limited to indoor tests on different soil samples to judge the possibility of mud cake formation, or only consider the influence of pressure on the mud cake formation, but not comprehensively consider the influence of parameters such as cutter head temperature, cutter head rotating speed, cutter head pressure and action time on the mud cake formation.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a device for forming mud cakes of a simulated shield cutter head, which can simulate the forming process of the mud cakes when the shield cutter head tunnels in a soil body, the test device can adjust the temperature of the cutter head, the rotating speed of the cutter head, the magnitude of applied pressure and the action time of the cutter head, a straight pipe is used for observing the generating process of the mud cakes under different tunneling conditions, and the forming degree of the mud cakes is judged by whether a metal probe retracts or not, so that test conditions are created for researching the forming mechanism, the forming reason, the prevention method, the treatment means and the like of the mud cakes.
The technical solution for realizing the purpose of the invention is as follows:
a simulated shield cutter disc mud cake forming device comprises a driving motor, a sensor group, a supporting frame, a mud inlet pipe, a transparent cylinder wall, a bottom plate, a jack, a reinforcing plate, an operating platform, a driving main shaft, a spring rod, a cutter disc, a heating device, a metal probe and a base cover, wherein the transparent cylinder wall is cylindrical and is vertically fixed on the bottom plate; during simulation test, soil is added from a mud inlet pipe, the cutter head starts to rotate downwards after being heated to simulate tunneling of the cutter head, and the metal probe retracts when the stress exceeds the pre-tightening force, so that formation of mud cakes is proved; the sensor group monitors parameters such as cutter head temperature, pressure, extrusion time, soil body strength, soil body thickness and the like.
Furthermore, a reinforcing plate is fixed between the transparent cylinder wall and the support, the transparent cylinder wall is arranged above the reinforcing plate, and the base cover, the bottom plate and the jack are arranged below the reinforcing plate.
Furthermore, height scales are carved on the transparent cylinder wall.
Furthermore, the cutter head is fixedly connected with the driving main shaft through a cutter head connecting bolt.
Furthermore, the driving motor is arranged on an operation platform above the simulation cutterhead.
Furthermore, the sensor group and the timer are fixed on an operation platform above the simulation cutter head, and the input and output among the timer, the sensor and the driving motor are connected.
Further, the sensor group comprises an axial force sensor, a torque sensor, a rotating speed sensor, a temperature sensor and a power sensor.
A test method for simulating a shield cutter mud cake forming device comprises the following steps:
step 1: vertically placing the test device on a horizontal ground, opening a mud inlet pipe, placing the mud inlet pipe into a test soil body according to the upper scale indication of the wall surface, and closing the mud inlet pipe;
step 2: heating the cutter head through a heating device, and applying pretightening force to the metal probe through a spring rod;
and step 3: pressurizing the soil body by using a jack, turning on a motor switch after the pressure reaches a preset value, driving the cutter head to rotate and pressurize downwards, starting timing by using a timer after the pressure reaches the preset value, and simulating the process that the shield cutter head is contacted with the soil body;
and 4, step 4: in the excavation process, the rotating speed of a cutter head and the pressure applied by the cutter head are adjusted, meanwhile, a sensor group records excavation data in real time, the data are displayed through a display instrument, and excavation parameters comprise the cutter head pressure, the cutter head temperature, the cutter head torque and the cutter head rotating speed;
and 5: when the stress of the metal probe exceeds a preset value, the probe retracts, the cutter head stops tunneling, the timer finishes timing, and the driving motor rotates reversely to enable the cutter head to ascend to a safe position. (ii) a
Step 6: and recording data obtained in the test process, removing the jack, opening the base cover, and taking out the mud cakes for subsequent research.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
the invention can simulate the process of tunneling a shield cutter head in a soil body, can visually observe the tunneling condition, can control key tunneling parameters such as the rotating speed of the cutter head, the tunneling speed of the cutter head, the temperature of the cutter head and the like during tunneling, can also automatically judge the forming degree of mud cakes, creates test conditions for researching the influence of the temperature of the cutter head on the forming of the mud cakes, the influence factor of the forming speed of the mud cakes and the like by monitoring the parameters such as force, torque, power and the like of the cutter head in real time during tunneling, and further has important reference significance for preventing and treating the problem of the cutter head mud cakes.
Drawings
Fig. 1 is a schematic structural diagram of a device for simulating formation of a shield cutter mud cake according to the invention.
Fig. 2 is a front view of a simulated shield cutter head mud cake forming device of the present invention.
Fig. 3 is a schematic structural diagram of a cutter head of the device for simulating formation of mud cakes of the shield cutter head.
Fig. 4 is a top view of a cutter head of a simulated shield cutter head mud cake forming device of the present invention.
In the figure: 1-driving motor and sensor group; 2-a support frame; 3-a mud inlet pipe; 4-transparent cylinder wall; 5-a bottom plate; 6-a jack; 7-reinforcing plates; 8-operating the platform; 9-driving the main shaft; 10-a spring rod; 11-a cutter head; 12-a heating device; 13-a metal probe; 14-base cover.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As shown in fig. 1-4, a device for forming a simulated shield cutter disc mud cake comprises a driving motor and sensor group 1, a support frame 2, a mud inlet pipe 3, a transparent cylinder wall 4, a bottom plate 5, a jack 6, a reinforcing plate 7, an operating platform 8, a driving main shaft 9, a spring rod 10, a cutter disc 11, a heating device 12, a metal probe 13 and a base cover 14. The bottom plate 5 is placed on the horizontal ground, is the bottommost part of the device, and has reinforcing plate 7 and support frame 2 above, and transparent section of thick bamboo wall 4 is the place that the mud cake produced, fixes on reinforcing plate 7, and its lower port is equipped with openable base lid 14, and jack 6 sets up in base lid 14 below, provides the counter-force for the soil body, advances the side that mud pipe 3 is located transparent section of thick bamboo wall 4, and operation platform 8 fixes on support frame 2, and its top is installed driving motor and has both been sensor group 1, and driving motor has both been connected with driving spindle 9 below sensor 1, spring beam 10 and blade disc 11.
The wall surface of the transparent cylinder wall 4 of the embodiment is provided with a height scale, so that soil bodies with the same height are added in each test, the thickness of a mud cake is measured after the test is finished, the transparent cylinder wall 4 and the reinforcing plate 7 are welded and fixed together, the base cover 14 at the bottom is closed in the test, the bottom is opened after the test is finished, the mud cake can be taken out from the position, and the jack 6 is jacked below the base cover 14 to provide counter force for the soil bodies.
The diameter of blade disc 11 slightly is less than the diameter of transparent section of thick bamboo wall 4, can stretch into in the transparent section of thick bamboo wall 4, adopt bolted connection between blade disc 11 and drive main shaft 9, be convenient for change the blade disc of different grade type, the drive main shaft 9 other end links to each other with driving motor 1, can realize positive and negative rotation and flexible function, heating device 12 of blade disc 11 top is electric heat drive, can heat blade disc 11, metal probe 13 of blade disc 11 below is total four, its probe stretches out the blade disc and contacts with the soil body, the other end links to each other with spring beam 10, provide the pretightning force by spring beam 10, operation platform 8 of blade disc 11 top is for placing driving motor and sensor group 1 place, also be the platform of arranging sensor display instrument and personnel's operation, operation platform 8 links to each other with.
The sensor group of this embodiment includes axial force sensor, temperature sensor, speed sensor, torque sensor and power sensor, and the sensor group still has the timer in addition to be used for measuring the time that the mud cake formed, and the data of sensor monitoring are read through display instrument, are opened and are dug the condition and carry out record and observation.
The test comprises the following steps:
step 1: vertically placing the testing device on a horizontal ground, opening a mud inlet pipe, placing a certain testing soil body according to the upper scale indication of the wall surface, and then closing the mud inlet pipe;
step 2: heating the cutter head by a heating device, and applying a certain pretightening force to the metal probe by using a spring rod;
and step 3: pressurizing the soil body by using a jack, after the pressure reaches a preset value, turning on a motor switch to drive a cutter head to rotate and pressurize downwards, simulating the process that the shield cutter head is contacted with the soil body, and starting timing by a timer when the numerical value of a pressure sensor reaches a threshold value;
and 4, step 4: adjusting the rotating speed of a cutter head and the pressure applied by the cutter head in the excavation process, simultaneously recording excavation data in real time by a sensor group, and displaying the data through a display instrument, wherein the excavation data comprises the cutter head pressure, the cutter head temperature, the cutter head torque and the cutter head rotating speed;
and 5: when the mud cake is basically formed, the stress of the metal probe exceeds a preset value, the probe retracts, the motor is turned off to stop the tunneling of the cutter head, and the timer finishes timing;
step 6: and lifting the cutter disc to a safe position, recording and arranging data obtained in the test process, removing the jack, opening the base cover, and taking out the mud cakes for other researches.
The foregoing is directed to embodiments of the present invention and, more particularly, to a method and apparatus for controlling a power converter in a power converter, including a power converter, a power.
Claims (9)
1. A device for forming mud cakes of a simulated shield cutter head is characterized by comprising a driving motor, a sensor group (1), a support frame (2), a mud inlet pipe (3), a transparent cylinder wall (4), a bottom plate (5), a jack (6), a reinforcing plate (7), an operating platform (8), a driving main shaft (9), a spring rod (10), a cutter head (11), a heating device (12), a metal probe (13) and a base cover (14);
the bottom plate (5) supports the whole device, the jack (6) is installed below the base cover (14) and provides counter force for the cutter head (11) to extrude soil, the lower end of the transparent cylinder wall (4) is installed on the base cover (14), the transparent cylinder wall (4) is of a cylindrical structure and is vertically fixed on the bottom plate (5), the lower end of the transparent cylinder wall is the base cover (14), the cutter head (11) is arranged at the upper end of the transparent cylinder wall, the cutter head (11) is driven by the driving main shaft (9), a sensor group is arranged on the driving main shaft (9), the mud inlet pipe (3) is positioned on the side wall surface of the transparent cylinder wall (4), the cutter head (11) enters the transparent cylinder wall (4) from the upper end, the cutter head (11) is cylindrical heat-conducting metal, the diameter of the metal is slightly smaller than the inner diameter of the transparent cylinder wall (4), the number of the metal probes (13) is four, the heating device (12) is installed at the top of the cutter head (11), electric energy is used for providing heat for the cutter head (11), the spring rod (10) is connected with the metal probe (13) and provides pre-tightening force for the metal probe (13), and the driving main shaft (9) drives the cutter head (11) to rotate and move up and down;
the sensor group (1) comprises an axial force sensor, a temperature sensor, a rotating speed sensor, a torque sensor and a power sensor, and is arranged on the operating platform (8);
the driving motor (1) provides driving force for the movement of the cutter head (11) and is arranged on the operating platform (8).
2. The device for forming the mud cake of the simulated shield cutter head and the detection method according to claim 1 are characterized in that: the base cover (14) is of an openable and closable structure and is detachable from the bottom.
3. The device for forming the mud cake of the simulated shield cutter head and the detection method according to claim 1 are characterized in that: a reinforcing plate is fixed between the transparent cylinder wall (4) and the support frame (2), the transparent cylinder wall (4) is arranged above the reinforcing plate, the base cover (14), the bottom plate (5) and the jack (6) are arranged below the reinforcing plate, and the side surface of the transparent cylinder wall (4) is carved with a height dimension.
4. The device for forming the mud cake of the simulated shield cutter head and the detection method according to claim 1 are characterized in that: the metal probe (13) is provided with pretightening force by the spring rod (10), and retracts when the pretightening force is exceeded by stress.
5. The device for forming the mud cake of the simulated shield cutter head and the detection method according to claim 1 are characterized in that: the sensor group (1) is connected with the driving motor (1).
6. The device for forming the mud cake of the simulated shield cutter head and the detection method according to claim 1 are characterized in that: the heating device (12) only heats the cutter disc and keeps constant temperature after reaching the set temperature.
7. The device for forming the mud cake of the simulated shield cutter head and the detection method according to claim 1 are characterized in that: the driving main shaft (9) is fixed on the cutter head, and the cutter head (11) is driven to move through the driving motor (1).
8. The device for forming the mud cake of the simulated shield cutter head and the detection method according to claim 1 are characterized in that: the cutter head is fixedly connected with the driving main shaft through a cutter head connecting bolt.
9. A test method for simulating a shield cutter mud cake forming device comprises the following steps:
step 1: vertically placing the test device on a horizontal ground, opening a mud inlet pipe, placing the mud inlet pipe into a test soil body according to the upper scale indication of the wall surface, and closing the mud inlet pipe;
step 2: heating the cutter head through a heating device, and applying pretightening force to the metal probe through a spring rod;
and step 3: pressurizing the soil body by using a jack, turning on a motor switch after the pressure reaches a preset value, driving the cutter head to rotate and pressurize downwards, starting timing by using a timer after the pressure reaches the preset value, and simulating the process that the shield cutter head is contacted with the soil body;
and 4, step 4: in the excavation process, the rotating speed of a cutter head and the pressure applied by the cutter head are adjusted, meanwhile, a sensor group records excavation data in real time, the data are displayed through a display instrument, and excavation parameters comprise the cutter head pressure, the cutter head temperature, the cutter head torque and the cutter head rotating speed;
and 5: when the stress of the metal probe exceeds a preset value, the probe retracts, the cutter head stops tunneling, the timer finishes timing, and the driving motor rotates reversely to enable the cutter head to ascend to a safe position. (ii) a
Step 6: and recording data obtained in the test process, removing the jack, opening the base cover, and taking out the mud cakes for subsequent research.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010426982.6A CN111502679A (en) | 2020-05-19 | 2020-05-19 | Simulation shield constructs blade disc mud cake and forms device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010426982.6A CN111502679A (en) | 2020-05-19 | 2020-05-19 | Simulation shield constructs blade disc mud cake and forms device |
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| Publication Number | Publication Date |
|---|---|
| CN111502679A true CN111502679A (en) | 2020-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010426982.6A Pending CN111502679A (en) | 2020-05-19 | 2020-05-19 | Simulation shield constructs blade disc mud cake and forms device |
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| CN109406389A (en) * | 2018-10-09 | 2019-03-01 | 南京林业大学 | Mud cake bond strength test device and test method on shield model test cutterhead |
| CN110186704A (en) * | 2019-07-11 | 2019-08-30 | 西南交通大学 | A kind of simulation air pressure auxiliary earth pressure balanced shield, EPBS experimental provision and experimental method |
| CN209924995U (en) * | 2019-12-03 | 2020-01-10 | 中铁九局集团第四工程有限公司 | Earth pressure balance shield constructs quick-witted blade disc mud cake scraping device |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101285386A (en) * | 2008-05-09 | 2008-10-15 | 清华大学 | Torsional moment and force loading unit for shield excavation simulation |
| CN201339473Y (en) * | 2008-12-24 | 2009-11-04 | 中铁隧道集团有限公司 | Foam injection device for composite shield ground conditioning system |
| CN101762625A (en) * | 2010-01-19 | 2010-06-30 | 南京工业大学 | Gas sensitivity measurement device for gas sensitive material |
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