CN114776313A - Anti-mud-cake steel plate for shield cutter head and simulation experiment table for characteristic test of anti-mud-cake steel plate - Google Patents
Anti-mud-cake steel plate for shield cutter head and simulation experiment table for characteristic test of anti-mud-cake steel plate Download PDFInfo
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- CN114776313A CN114776313A CN202210396477.0A CN202210396477A CN114776313A CN 114776313 A CN114776313 A CN 114776313A CN 202210396477 A CN202210396477 A CN 202210396477A CN 114776313 A CN114776313 A CN 114776313A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 99
- 239000010959 steel Substances 0.000 title claims abstract description 99
- 238000012360 testing method Methods 0.000 title claims abstract description 43
- 238000004088 simulation Methods 0.000 title claims abstract description 19
- 229910000756 V alloy Inorganic materials 0.000 claims abstract description 20
- WUJISAYEUPRJOG-UHFFFAOYSA-N molybdenum vanadium Chemical compound [V].[Mo] WUJISAYEUPRJOG-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000003860 storage Methods 0.000 claims description 23
- 230000007246 mechanism Effects 0.000 claims description 21
- 238000009434 installation Methods 0.000 claims description 17
- 238000002474 experimental method Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 13
- 230000002457 bidirectional effect Effects 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 230000003287 optical effect Effects 0.000 claims description 10
- 238000010276 construction Methods 0.000 abstract description 5
- 239000002002 slurry Substances 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000012986 modification Methods 0.000 abstract description 3
- 230000004048 modification Effects 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 239000004927 clay Substances 0.000 description 75
- 238000000034 method Methods 0.000 description 11
- 239000002689 soil Substances 0.000 description 11
- 238000005303 weighing Methods 0.000 description 8
- 230000005641 tunneling Effects 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 6
- 238000007405 data analysis Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 229910000278 bentonite Inorganic materials 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 101150062705 Wipf3 gene Proteins 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
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- 238000002360 preparation method Methods 0.000 description 1
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- 239000002893 slag Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a testing device of shield construction equipment, in particular to a mud cake preventing steel plate for a shield cutter head and a simulation experiment table for testing the characteristics of the steel plate. The problem of the shield constructs the mud cake and influences the mud outflow on the tool bit among the prior art, and then influences whole operating condition is solved. The shield cutter head is arranged on a shield cutter head, the shape and the position of the front cutter face of the cutter head on the cutter head are consistent with the shape and the position of the front cutter face of the cutter head on the cutter head, the front cutter face and the front cutter face are connected through bolts, the steel plate is made of molybdenum-vanadium alloy or Q235/Q245 through modification, and the surface finish degree of the upper surface is less than 0.1. Has the advantages that: the cutter head is equivalently provided with the toughened film which is beneficial to slurry sliding, and the toughened film is provided with a set of detection platform, so that the toughened film can be adjusted and replaced in real time under different working conditions.
Description
Technical Field
The invention relates to a testing device of shield construction equipment, in particular to a mud cake preventing steel plate for a shield cutter head and a simulation experiment table for testing the characteristics of the steel plate.
Background
In the shield tunneling operation, the stratum at the top of the tunnel is mainly silty clay, silty fine sand, clay, cobble soil and pebble soil. The tunnel penetrates through the stratum and comprises: 16% of silty clay, 11% of silty fine sand, 8% of clay, 15% of breccia soil, 5% of pebble soil, 25% of strongly weathered mudstone, 14% of moderately weathered mudstone and 2% of moderately weathered gravel-containing mudstone. Karst is also present at the local site.
The clay and the strong-stroke argillaceous rocks contain a large amount of viscous minerals, and the soil body adhesion is strong. The clay cut by the cutter is very easy to attach to the position of a cutter head panel and the opening of the cutter head, is not easy to flow back out of a bin and is easy to generate stagnation and discharge, a stacked bottom bin is formed at the bottom of the bin, clay attached to the cutter head forms mud cakes on the cutter head panel under the extrusion action, the mud cakes are deposited to block the opening of the cutter head, the circulation in the bin is not smooth, the tunneling efficiency is reduced, the tunneling length in a stratum containing clay and mud rocks of the shield exceeds 2400 m, and the prevention and control of the mud cakes on the cutter head in the tunneling process of the shield construction are a serious difficulty.
In the present stage, analysis and prejudgment of the cutter head mud cake formation data are mainly focused on simulation of field working conditions, for example, in published Chinese patent documents, the patent with application number CN201810116195.4 named as a test device and method for soil pressure balance shield cutter head mud cake formation simulation, and the distribution and form conditions of mud cakes are observed by simulating shield tunneling in a specific soil body, adjusting cutter arrangement and construction parameters, so that a basis is provided for researching mud cake phenomenon generation mechanisms and mud cake prevention and treatment methods. For example, application number CN 202110140730.1 is also named as a simulation system for regulating shield cutter head mud cake formation, and the simulation system also provides a basis for a mud cake prevention and treatment method through simulation of a cutter head.
However, the applicant believes that the technology at this stage mainly consists in simulating the cutter head system, measuring the real-time temperature and pressure on the cutter head, and then improving the cutter head by combining the sample conditions, but in practice, it is known that the cutting angle and the cutting temperature on the cutter head are actually low in adjustable space, and most of the time, the proper adjustment cannot be completely made.
Disclosure of Invention
The invention aims to solve the problem that in the prior art, mud cakes on a shield cutter head influence the outflow of mud, so that the overall working state is influenced.
The specific scheme of the invention is as follows:
the steel plate for the shield cutter head is arranged on the shield cutter head, is specifically clamped on the front cutter face of the cutter head on the cutter head, is consistent with the shape and the position of the front cutter face of the cutter head on the cutter head, is connected with the front cutter faces through bolts, is made of molybdenum-vanadium alloy and Q235/Q245, and has the upper surface smoothness of less than 0.1.
A simulation experiment table for testing characteristics of a steel plate comprises an experiment table frame, wherein the experiment table frame comprises a lower storage supporting area and an upper equipment inclination angle area, hinge connection for connecting hinge structural components is arranged between the lower storage supporting area and the upper equipment inclination angle area, an experiment plate supporting table driven by a bidirectional motor is installed in the upper equipment inclination angle area, the experiment plate supporting table is installed on a door-shaped support and comprises a bottom rotating shaft and a clamping jaw installed on the bottom rotating shaft, and the clamping jaw clamps an experiment plate with the length of 40-60 cm and the width of 40-60 cm;
the rotating shaft is installed at the top end of the door-shaped support through a bearing, the input end of the rotating shaft is connected with the output shaft of the bidirectional motor, the experimental plate corresponds to the steel plate material and is correspondingly made of molybdenum-vanadium alloy or Q235/Q245, the surface finish degree of the experimental plate is less than 0.1, a stirring barrel, a sample box and a plurality of experimental plates to be tested are arranged in the lower storage supporting area, the sample box is in a hollow cylindrical barrel shape, and the inner diameter of the sample box is less than 8 cm.
In specific implementation, the experimental plate to be tested is vertically clamped in the lower storage and support area.
In specific implementation, the lower part storage supporting area and the upper part equipment inclination angle area are provided with angle support measuring mechanisms, each angle support measuring mechanism comprises a sliding groove rod and a locking bolt, the top end of each sliding groove rod is connected and installed at the bottom edge of the upper part equipment inclination angle area through a rotating shaft, a sliding groove is formed in each sliding groove rod, each locking bolt penetrates through each sliding groove and each horizontal groove to be fixed on the upper edge of the lower part storage supporting area, and each sliding groove is provided with a scale mark so as to guide the installation angle between the lower part storage supporting area and the upper part equipment inclination angle area.
In specific implementation, the bidirectional motor is further connected with a control mechanism, and the control mechanism is provided with a display screen and a key to control the opening, closing, steering and rotating speed of the bidirectional motor.
In a specific implementation, the lower surface finish of the experimental plate is less than 0.16.
In specific implementation, the edge of the experimental plate is clamped with a tension meter positioning clamp, the head part of the tension meter is hung on the tension meter positioning clamp, the tail end of the tension meter is embedded in the sample box, and the tension meter positioning clamp comprises a [ shaped ] clamp body and a roller arranged at the edge of the experimental plate in a sliding manner in the clamp body.
In a specific implementation, the surface region of the experiment board is provided with a mark line formed by the mark strokes or a mark line projected by an optical mechanism, the optical mechanism comprises a transverse light column for emitting grid-shaped optical lines and support columns at two sides of the transverse light column, and the support columns are clamped on the clamping jaws.
The invention has the beneficial effects that:
different from the prior art, the mud cake is firstly researched, then a steel sheet which is most suitable for the mud cake in the current year is found according to the data of the mud cake, the further steel sheet is equivalent to a layer of toughened film which is beneficial to the slip of slurry and is added on a cutter head, and meanwhile, the toughened film is provided with a set of detection platform, so that the toughened film can be adjusted and replaced in real time under different working conditions, and the change space for changing the property of the cutter head is greatly increased;
specifically, the front cutter face of the cutter head, namely the blade arranged on the main working face, has the characteristic of excellent low surface friction, so that the adhesion of slurry on the main cutting face can be greatly reduced, meanwhile, the blades are made of different materials, the requirements of different requirements on excavating soil layers can be met, the cost is ensured, and the blockage of the slurry on a steel sheet caused by reciprocating jumping is avoided to the maximum extent;
the design of the two sides of the experiment plate is convenient for improving the experiment efficiency and reducing the number of the experiment plates;
the simulated test platform has a simple structure, occupies a small area, can be operated by connecting a circuit, has low requirements on test sites, can basically produce results on site in the test, and has short test time;
the cutting face of the shield cutter head can be simulated at multiple angles, and the accuracy of a test result is guaranteed.
The operation panel can measure multiunit data simultaneously, and the function is various.
Drawings
FIG. 1 is a front view of the structure of the present invention;
FIG. 2 is a top view of the structure of the present invention;
FIG. 3 is a left side view of the structure of the present invention;
FIG. 4 is a right side view of the inventive structure;
FIG. 5 is a rear view of the structure of the present invention;
FIG. 6 is a rear view of another state of the present invention;
FIG. 7 is a perspective view of the present invention;
FIG. 8 is a perspective view from another angle of the present invention;
FIG. 9 is a schematic view of the cutter head for the blade positions involved;
FIG. 10 is a perspective view showing another measurement state in the present invention
FIG. 11 is a graph showing the influence of an inclination angle on a sliding starting inclination angle of clay;
FIG. 12 is a graph showing the relationship between the effect of the inclination angle of multiple materials on the sliding start inclination angle of clay
FIG. 13 is a fitting relationship between K and a sliding critical rotation speed of the steel plate clay;
names of components in the drawings: 1. a rake face; 2. a lower storage support area; 3. an upper equipment tilt zone; 4. a hinge structure member; 5. a control mechanism;
21. an experimental plate support table; 22. a bi-directional motor; 23. a gantry support; 24. a bottom rotating shaft; 25. a claw; 26. an experimental plate; 27. a bearing;
31. locking the bolt; 32. a chute; 33. a horizontal groove; 34. installing a clamp on the experiment board; 35. a stirring barrel; 36. a sample box mounting plate;
6. a sample cartridge; 7. a tension meter; 8. a tension meter positioning clamp; 9. an optical mechanism; 10. a plate material; 11. mud mark
81. A clip body; 82. a roller;
91. a support column; 92. a transverse light pillar.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1
A steel plate for a shield cutter head is installed on the shield cutter head, and specifically, a front cutter face 1 of the cutter head on a cutter head is clamped and installed to be consistent with the shape and position of the front cutter face of the cutter head on the cutter head and connected with the front cutter faces through bolts, the steel plate is made of molybdenum-vanadium alloy and one of Q235/Q245, and the finish degree of the upper surface is less than 0.1.
The test bed comprises a lower storage supporting area 2 and an upper equipment inclination angle area 3, hinge connection of hinge structure parts 4 is arranged between the lower storage supporting area and the upper equipment inclination angle area, an experimental plate supporting table 21 driven by a bidirectional motor 22 is installed in the upper equipment inclination angle area, the experimental plate supporting table 21 is installed on a door-shaped support 23 and comprises a bottom rotating shaft 24 and a clamping jaw 25 installed on the bottom rotating shaft 24, and the clamping jaw 25 clamps an experimental plate 26 with the length of 40-60 cm and the width of 40-60 cm;
the rotating shaft 24 is mounted at the top end of the door-shaped support through a bearing 27, the input end of the rotating shaft is connected with the output shaft of the bidirectional motor, the experimental plate 26 corresponds to the steel plate material and is correspondingly made of molybdenum-vanadium alloy or Q235/Q245, the upper surface finish degree is less than 0.1, the stirring barrel 35, the sample box 6 and a plurality of experimental plates to be tested are arranged in the lower storage supporting area, the sample box 6 is in a hollow cylindrical barrel shape, and the inner diameter is less than 8 cm.
The experimental plate to be tested is vertically clamped in the lower storage supporting area
Lower part storage supporting area and upper portion equipment inclination district are equipped with angle support measuring mechanism, angle support measuring mechanism includes spout pole and locking bolt 31, the top of spout pole is installed via the pivot connection the bottom edge in upper portion equipment inclination district is provided with spout 32 on the spout pole, and the bottom frame in upper portion equipment inclination district is equipped with horizontal groove 33, the locking bolt warp spout and horizontal groove are fixed on the upper portion edge in lower part storage supporting area, be equipped with the scale mark on the spout 32 in order to guide the interval installation angle in lower part storage supporting area and upper portion equipment inclination.
The bidirectional motor 22 is further connected with a control mechanism 5, and the control mechanism is provided with a display screen and a key to control the opening, closing, steering and rotating speed of the bidirectional motor.
The lower surface finish of the test plate is less than 0.16.
The edge of the experiment plate is clamped with a tension meter positioning clamp, the head part of a tension meter 7 is hung on the tension meter positioning clamp 8, and the tail end of the tension meter is embedded in the sample box 6. The tension meter positioning clamp comprises a [ type clamp body and a roller 72 which is arranged at the edge of the experimental plate in the clamp body in a sliding way.
The surface area of the experiment board is divided into marking lines formed by mark strokes or marking lines projected by an optical mechanism 9, the optical mechanism 9 comprises a transverse light column for emitting grid-shaped optical lines and supporting columns 91 at two sides of the transverse light column 92, and the supporting columns 91 are clamped on the clamping jaws 25. The clamping type is a face-to-face type opposite clamping type.
The embodiment also relates to a test method for following the working of the simulation experiment table for testing the characteristics of the steel plate, which comprises the following steps:
(1) preparing clay: (a) weighing natural clay or 300g of simulation shield site cost clay, and pouring the clay into a stirring barrel; (b) weighing 20g of II-grade bentonite, pouring into the stirring barrel, and uniformly stirring; (c) 100ml of tap water is measured by using a measuring cylinder, slowly poured into the stirring barrel, and uniformly stirred; (5) putting the prepared clay into a dry sample box, and weighing the total mass of the clay and the sample box;
(2) adjusting the multifunctional steel plate clamping device to ensure that the installation inclination angle of the experimental plate is firstly adjusted to 0 degree, and then placing the sample box filled with clay on the upper part of the steel plate surface; (b) gradually adjusting the rotation inclination angle of the steel plate by a control system of the multifunctional steel plate clamping device until the clay starts to rotate on the surface of the steel plate, recording a sliding starting angle, simultaneously measuring the tension of a tension meter, and converting the tension into the friction force of the steel plate on the clay through calculation; (c) the same steps are used, the installation inclination angle of the steel plate is adjusted to 5 degrees and 10 degrees respectively, repeated tests are carried out, data are recorded, and clay starting angle and starting tension test data are obtained;
(3) data analysis is carried out to obtain the influence of the installation inclination angle on the starting angle, and a steel plate material with proper field working condition is selected as a cutter
The moving pair connection ensures that the roller group can realize linear movement on the substrate, thereby adjusting the distance between rollers in the roller group and adapting to the measurement of the motor stators and rotors with different sizes.
In the working process, two types of different mirror steel plates, namely a Q345 steel plate and a molybdenum-vanadium alloy, are used, each steel plate has positive and negative two different smooth degrees, the steel plates are adjusted to different angles and fixed by a multifunctional steel plate clamping device respectively, the sliding starting angle, the sliding speed degree and the mud remaining amount of clay on the surfaces of the steel plates are recorded, and meanwhile, the tension of the clay during sliding is tested by a tension meter and converted into the sliding friction force of the steel plates. Firstly, clay is manufactured, or mud and soil discharged from a construction pattern layer are sampled, and then the clay and soil are measured on different experimental boards, and the sliding angle, especially the static friction angle and the sliding tension are measured. After the most appropriate experimental plate material is determined, the steel plates made of the same material are selected and installed on the blades, so that the conversion from experiment to actual combat can be completed, the stable output of slurry in the tunneling process is realized, and the blocking caused by jumping is prevented.
The following is exemplified in a single working run:
firstly, clay preparation is carried out: (1) weighing 300g of natural clay, and pouring into a stirring barrel; (2) weighing 20g of II-grade bentonite, pouring into the stirring barrel, and uniformly stirring;
3) 100ml of tap water is measured by a measuring cylinder, slowly poured into the stirring barrel and uniformly stirred; 4) and (3) putting the prepared clay into a dry sample box, and weighing the total mass of the clay and the sample box.
Secondly, testing the sliding starting angle of the clay.
When the device works, the inclination angle area of the upper device is adjusted to ensure that the installation inclination angle of the specially processed experimental plate is firstly adjusted to 0 degree, and then the sample box filled with clay is placed on the upper part of the steel plate surface; (2) gradually adjusting the rotation inclination angle of the steel plate through a control system until the clay starts to rotate on the surface of the steel plate, recording a sliding starting angle, measuring the tension of a tension meter, and converting the tension into the friction force of the steel plate on the clay through calculation; (3) the same procedure was used to adjust the steel plate installation tilt angle to 5 ° and 10 ° respectively, repeat the test, and record the data, as shown in table 1.
TABLE 1 Clay Start Angle and Start tension test data
Data analysis was then performed:
based on experimental data, the influence of the installation inclination angle on the clay sliding starting angle is analyzed, and research finds that under the experimental condition, along with the increase of the installation inclination angle, the clay sliding starting inclination angle is gradually reduced, namely along with the increase of the installation inclination angle, the clay is more and more favorable for falling of the clay from the surface of the steel plate, specifically as shown in fig. 11, a Q345 steel plate and Ra0.012 are taken as representatives, and an influence relation curve of the installation inclination angle on the clay sliding starting inclination angle is drawn.
Still further, the effect of the steel properties on the launch angle can be analyzed:
according to data analysis, as shown in fig. 4, by comparing a curve Q345 (ra0.012) with a curve Q345 (ra0.2) and comparing a molybdenum-vanadium alloy curve (ra0.012) with a curve (ra0.2), it can be obtained that for the same kind of steel, when the smooth finish is different, the starting inclination angle of the sliding of the clay is greatly influenced, namely the smooth finish is better, and under the same condition, the smaller the starting angle is, namely the same sliding length is, more time can be won for the sliding of the clay on the steel plate; by comparing the curve Q345 (Ra0.012) with the Mo-V alloy curve (Ra0.012) and comparing the curve Q345 (Ra0.2) with the Mo-V alloy curve (Ra0.2), the Mo-V alloy steel plate has better anti-caking effect than the Q345 steel plate for different steels with the same smoothness. The molybdenum-vanadium alloy can be Cr12, Cr16 and Cr20, and Q235 can be replaced by Q225 and Q245.
Further, analysis of the influence of the steel characteristics on the clay sliding friction force was conducted.
In view of the fact that the sliding friction force of the indoor test steel plate to the clay is not easy to directly obtain, the sliding friction force is straightMeasuring the tensile force of the clay during sliding according to FForce of sliding down=FTension force+FFrictional forceAnd converting to obtain the friction force when the clay slides downwards. Namely, under the condition that the slip force is certain, the measured pulling force is larger, the friction force received by the clay slip is smaller, and the clay slip is less prone to caking. For convenience of calculation, the condition that the installation inclination angle is 0 degree is adopted for analysis, the total mass of the clay box sample box is 286g, specific tensile test data and calculated friction force are shown in table 4, and the friction force data comparison of Q345 (Ra0.012) and Q345 (Ra0.2) and the friction force data comparison of molybdenum-vanadium alloy (Ra0.012) and molybdenum-vanadium alloy (Ra0.2) show that the higher the smoothness of the same steel plate is, the smaller the friction force is; through the comparison of the data of the friction force between the Q345 (Ra0.012) and the Mo-V alloy (Ra0.012) and the data of the friction force between the Q345 (Ra0.2) and the Mo-V alloy (Ra0.2), when the smoothness is the same, the friction force applied to the clay on the Mo-V alloy steel plate is smaller than that on the Q345 steel plate. The experimental procedure is shown in fig. 5.
TABLE 2 installation Dip angle 0 DEG Friction force statistics table for different materials and smooth surfaces
And further, testing and analyzing the influence of the rotating speed of the cutter head on the mud cake.
5.2.1 test procedure
(1) Weighing the prepared clay, fixing the contact area of the clay and the steel plate to ensure that the contact area is consistent in each test, and pressing the upper surface of the clay with the same force to enable the clay to be bonded with the steel plate;
(2) adjusting the multifunctional steel plate clamping device to rotate at different speeds, and recording the sliding condition of clay on a steel plate;
(3) and weighing clays with different masses, and repeating the test.
5.2.2 data analysis
Through the test, the data of the sliding influence of the rotating speed of the cutter head with the same degree of finish on the clay with different qualities aiming at the same steel plate are obtained, and the test phenomenon is recorded. The test data are shown in table 3. Data analysis in the table shows that, for fixed mass in unit area, the faster the rotating speed of the steel plate is, the more unfavorable the clay slip is, the easier the clay slip is to accumulate to form mud cakes, a concrete phenomenon in the test is that the clay can swing back and forth and does not fall off in the process of rotating by 0-360 degrees along with the increase of the rotating speed of the steel plate, and when the rotating speed of the steel plate is below the critical rotating speed, the clay slips off from the edge of the steel plate in the process of rotating by 0-180 degrees.
TABLE 3 statistical table of influence data of steel plate rotating speed on clay slip
The clay with different masses has the same contact area with the steel plate, so that the mass of the clay in unit area can form a corresponding relation with the rotating speed of the steel plate, and a parameter basis is provided for setting the excavation penetration degree and the rotating speed of the cutter head of the field shield tunneling machine. The contact area of the fixed clay and the steel plate is 50cm2Setting the mass of clay per unit area as represented by symbol K, and forming a one-to-one correspondence relationship between K and the critical falling speed of steel plate clay based on the data in Table 3, as shown in Table 4. Fig. 13 is a fitting relationship between K and the sliding critical rotation speed of the steel plate clay.
Table 4K and steel plate clay slipping critical rotating speed corresponding relation
Based on the data in table 4, the data was subjected to fitting processing, and the processing result is shown in fig. 12, and the curve is approximated to a straight line.
During specific work, a plate is arranged above the lower storage and support area to receive the dropped mud cakes.
Finally, aiming at the condition that clay is taken as a material, a test conclusion and a suggestion are made.
(1) To the different installation inclination of same steel sheet, the installation inclination is big more, and the gliding start angle of clay is less, is favorable to the discharge of clay more. The mounting inclination angle is recommended to properly increase the slope angle of steel at the opening of a lower cutter under the condition of ensuring the strength of the opening of the cutter.
(2) Aiming at different finishments of the same steel plate, the surface finishment is higher, and under the condition of the same installation inclination angle, the clay sliding starting angle is smaller, so that the clay stratum muck is more favorably discharged. The existing shield machine cutter head opening is suggested to be provided with a high-finish mirror steel plate on the rough steel plate surface, so as to carry out field test.
(3) Through the comparison of the Q345 steel plate and the molybdenum-vanadium alloy steel plate test, the molybdenum-vanadium alloy steel plate has better performance than the Q345 steel plate in the aspect of preventing mud cakes, but compared with the rough surface of the traditional steel, the two steels can show obvious advantages. Two steel plates are respectively additionally arranged at the supporting part of the on-site cutter head to carry out tests so as to judge which material is used in the later period, and the method is more economical and reasonable.
(4) The cutter head rotational speed has great influence to the landing of clay on the steel sheet, and to the clay of certain unit area quality, when the cutter head rotational speed is below the critical rotational speed, the clay can be smooth from the steel sheet edge gliding, when the cutter head rotational speed is above the critical rotational speed, glutinous and showing for 360 rotations along with the steel sheet and horizontal hunting, difficult steel sheet surface landing of following. When the stratum easy to form mud cakes is excavated on site, the rotating speed of the cutter head is timely adjusted according to the slag quantity.
In the concrete implementation, by using the method, specific conclusions under different soil qualities can be drawn, so that the most appropriate material is selected to be used as a steel sheet to be paved on the main cutting surface of the shield cutting in combination with cost control, and the mud retention channel condition is adjusted and improved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a shield constructs blade disc with preventing mud cake steel sheet which characterized in that: the steel plate is arranged on the shield cutter head, the shape and the position of the front cutter face of the cutter head on the cutter head are consistent with the shape and the position of the front cutter face of the cutter head on the cutter head, the steel plate is connected with the front cutter faces through bolts, the steel plate is made of molybdenum-vanadium alloy and Q235/Q245 in a modified mode, and the surface finish degree of the upper surface is less than 0.1.
2. A simulation experiment table for testing the characteristics of a steel plate is characterized in that: the device comprises a test bed frame, wherein the test bed frame comprises a lower storage supporting area and an upper equipment inclination angle area, hinge connection for connecting hinge structural components is arranged between the lower storage supporting area and the upper equipment inclination angle area, an experimental plate supporting table driven by a bidirectional motor is installed in the upper equipment inclination angle area, the experimental plate supporting table is installed on a door-shaped support and comprises a bottom rotating shaft and a clamping jaw installed on the bottom rotating shaft, and the clamping jaw clamps an experimental plate with the length of 40-60 cm and the width of 40-60 cm;
the rotating shaft is mounted at the top end of the door-shaped support through a bearing, the input end of the rotating shaft is connected with the output shaft of the bidirectional motor, the experimental plate corresponds to the steel plate in material, is correspondingly made of molybdenum-vanadium alloy or Q235/Q245 in a modified mode, the smoothness of the upper surface is less than 0.1, a stirring barrel, a sample box and a plurality of experimental plates to be tested are arranged in the lower storage supporting area, the sample box is in a hollow cylindrical barrel shape, and the inner diameter of the sample box is less than 8 cm.
3. The simulation bench for characteristic test of steel sheet as set forth in claim 1, wherein: the experimental plate to be tested is vertically clamped in the lower storage supporting area.
4. The simulation bench for characteristic test of steel sheet according to claim 1, wherein: lower part storage supporting area and upper portion equipment inclination district are equipped with angle support measuring mechanism, angle support measuring mechanism includes spout pole and locking bolt, the top of spout pole is installed via the pivot connection the bottom edge in upper portion equipment inclination district is provided with the spout on the spout pole, and the bottom frame in upper portion equipment inclination district is equipped with the horizontal groove, locking bolt wears to warp spout and horizontal groove are fixed on the upper portion edge in lower part storage supporting area, be equipped with the scale mark on the spout in order to guide the interval installation angle in lower part storage supporting area and upper portion equipment inclination.
5. The simulation bench for characteristic test of steel sheet as set forth in claim 1, wherein: the bidirectional motor is further connected with a control mechanism, and the control mechanism is provided with a display screen and a key to control the opening, the closing, the steering and the rotating speed of the bidirectional motor.
6. The simulation bench for characteristic test of steel sheet according to claim 4, wherein: the lower surface finish of the test plate is less than 0.16.
7. The simulation bench for characteristic test of steel sheet according to claim 5, wherein: the edge of the experimental plate is clamped with a tension meter positioning clamp, the head part of the tension meter is hung on the tension meter positioning clamp, the tail end of the tension meter positioning clamp is embedded in the sample box, and the tension meter positioning clamp comprises a [ shaped ] clamp body and a roller arranged at the edge of the experimental plate in a sliding manner in the clamp body.
8. The simulation bench for characteristic test of steel sheet according to claim 1, wherein: the surface area of the experiment board is divided into marking lines formed by mark strokes or marking lines projected by an optical mechanism, the optical mechanism comprises a transverse light column for emitting latticed optical lines and supporting columns on two sides of the transverse light column, and the supporting columns are clamped on the clamping jaws.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210396477.0A CN114776313A (en) | 2022-04-15 | 2022-04-15 | Anti-mud-cake steel plate for shield cutter head and simulation experiment table for characteristic test of anti-mud-cake steel plate |
| PCT/CN2022/137067 WO2023202088A1 (en) | 2022-04-15 | 2022-12-06 | Mud cake formation prevention steel plate for shield cutter head, and simulation test table and test method for characteristic testing thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210396477.0A CN114776313A (en) | 2022-04-15 | 2022-04-15 | Anti-mud-cake steel plate for shield cutter head and simulation experiment table for characteristic test of anti-mud-cake steel plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114776313A true CN114776313A (en) | 2022-07-22 |
Family
ID=82429594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210396477.0A Pending CN114776313A (en) | 2022-04-15 | 2022-04-15 | Anti-mud-cake steel plate for shield cutter head and simulation experiment table for characteristic test of anti-mud-cake steel plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114776313A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023202088A1 (en) * | 2022-04-15 | 2023-10-26 | 盾构及掘进技术国家重点实验室 | Mud cake formation prevention steel plate for shield cutter head, and simulation test table and test method for characteristic testing thereof |
-
2022
- 2022-04-15 CN CN202210396477.0A patent/CN114776313A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023202088A1 (en) * | 2022-04-15 | 2023-10-26 | 盾构及掘进技术国家重点实验室 | Mud cake formation prevention steel plate for shield cutter head, and simulation test table and test method for characteristic testing thereof |
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