CN210487229U - Shield tail synchronous grouting slurry buoyancy measuring device - Google Patents
Shield tail synchronous grouting slurry buoyancy measuring device Download PDFInfo
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- CN210487229U CN210487229U CN201921731075.1U CN201921731075U CN210487229U CN 210487229 U CN210487229 U CN 210487229U CN 201921731075 U CN201921731075 U CN 201921731075U CN 210487229 U CN210487229 U CN 210487229U
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Abstract
The utility model discloses a shield tail synchronous slip casting thick liquid buoyancy measuring device relates to tunnel construction technical field, its technical scheme main points be including the container that is used for holding the thick liquid, submergence in the section of jurisdiction model of thick liquid and set up in the measuring force device of container top, measuring force device's measurement end links in the top of section of jurisdiction model, still including setting up in the inside vibrator of section of jurisdiction model, and the actual conditions is pressed close to more to the technical effect, and the measured data that obtains after the simulation is more accurate.
Description
Technical Field
The utility model relates to a tunnel construction technical field, in particular to synchronous slip casting thick liquid buoyancy measuring device of shield tail of shield constructs.
Background
With the rapid development of urban subway construction in China, the shield method is widely adopted with the advantages of high efficiency, safety and environmental protection. However, when construction is carried out under the geological condition of a mudstone stratum, the floating problem of the shield tunnel segment is abnormal and prominent, the floating of the shield tunnel segment means that the segment is influenced by factors such as geology, underground water, synchronous slurry and the like after the segment is separated from a tail shield, so that the segment is displaced upwards, and the floating amount of a person with serious floating can reach 200-300 mm. The harm caused by the overlarge floating amount of the shield tunnel segment mainly comprises the following steps: firstly, the segment floating causes segment forming quality defects, the phenomenon of dislocation of adjacent shield tunnel segments exists, when the segment dislocation reaches a control amount, the segment bolt joint is damaged, and meanwhile, the segment floating influences the water stopping effect of a segment sealing gasket, so that segment leakage water is caused; secondly, the deviation of the design axis of the tunnel is too large, whether the line type of the tunnel is in line with the design axis and whether the boundary of the tunnel building is met is directly influenced, the shield tunnel segment is installed in a mudstone stratum below the ground, and the deviation of the design axis of the tunnel is too large and the design requirement cannot be met due to the fact that the tunnel axis is arched after the shield tunnel segment floats upwards.
At present, professionals in the industry have studied the problem for a long time, but no consensus is achieved on the mechanism of tunnel floating and the contribution of each factor, so that floating control of the shield tunnel still depends on simulation analysis research and practical experience induction. The common simulation analysis method has the characteristics of low cost, small test implementation difficulty and the like, and can simulate to obtain corresponding data and analyze the data according to different same slurry properties and different engineering conditions so as to be referred to engineering practice.
At present, chinese patent publication No. CN109974924A discloses a buoyancy measuring device and a buoyancy measuring method for synchronous grouting slurry at the tail of a shield, which comprises a container with an opening at the upper part, wherein slurry is contained in the container; a force measuring device supported above the container by a support; and a segment model completely immersed in the slurry, wherein sealing films are covered at two ends of the segment model, and the segment model is connected to the lower end of the tension meter.
Although the model test device can measure the tension of the segment model on the tension meter under the two states of no slurry and immersed in the slurry so as to obtain the floating force of the segment model, the shield synchronous grouting usually comprises sand, powdered carbon ash, bentonite and water, and the slurry is a viscous fluid which has certain fluidity but has obvious viscosity relative to water. The shield machine can vibrate during tunneling, and the vehicle in the tunnel can also vibrate during operation, so that synchronous grouting of the shield near a shield tunnel segment has a shear thickening effect, the shear thickening effect means that the viscosity of fluid shows a non-Newtonian fluid behavior with the increase of magnitude along with the increase of shear rate or shear stress, and in a simple way, the larger the viscosity is, the closer the property shown by the fluid is to a solid, and the smaller the buoyancy can be generated. And in the comparison file, the shield grouting is ideally Newtonian fluid, the influence of buoyancy change caused by vibration on the experiment of the simulation device is not considered, and the obtained result deviates from the reality.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a shield tail synchronous slip casting thick liquid buoyancy measuring device, it has more presses close to actual conditions, and the measured data that obtains after the simulation is more accurate advantage.
The above technical purpose of the present invention can be achieved by the following technical solutions:
a shield tail synchronous grouting slurry buoyancy measuring device comprises a container for containing slurry, a segment model immersed in the slurry, and a force measuring device arranged above the container, wherein the measuring end of the force measuring device is connected to the top of the segment model; the device is characterized by further comprising a vibration device arranged inside the segment model.
Through adopting above-mentioned technical scheme, the vibrating device of section of jurisdiction model inside is simulated the produced vibrations of shield tunneling machine tunnelling and intraductal vehicle travel for section of jurisdiction model is irregularly to carrying out extrusion collision to thick liquid all around, and the thick liquid is owing to receive extrusion collision and take place shear thickening, and its liquid characteristic reduces, and the solid characteristic increases. In the case of liquid, the liquid is squeezed by gravity and flows freely, so that pressure is generated inside the liquid and increases with the increase of depth, and the buoyancy is the difference between the liquid pressure on the downward side and the liquid pressure on the upward side of the object. When the slurry tends to solidify due to shear thickening, the fluidity deteriorates and its pressure on the outer wall of the pipe mold is also reduced, so that the buoyancy is reduced. In conclusion, due to the arrangement of the vibration device, the simulation of the measuring device can be closer to the real situation, and the obtained buoyancy data error is smaller.
Further setting: the container and the segment model are both arranged in a cylindrical shape.
Through adopting above-mentioned technical scheme, because be full of the thick liquid between container and the section of jurisdiction model, the section of jurisdiction model when taking place vibrations, the extruded thick liquid of the model of being divided by the section of jurisdiction has the trend of outside removal, and container and section of jurisdiction model are cylindric setting, compare in the comparison file, and the thick liquid can receive the hindrance of wall, the simulation true situation that can be just good. When the floating and sinking are not directly affected by the vibration of the segment model in the horizontal direction, only the vibration in the vertical direction is discussed. First, the segment model and the internal vibration device are discussed in isolation, which vibrates without external force and the center of gravity is not changed. When the segment model vibrates upwards, the segment model is pressed upwards, and in addition to the downward pressure generated by the slurry due to self weight, the segment model is also subjected to the reaction force transmitted by the slurry through the upper wall compared with a comparison document, so that the segment model is more difficult to push away the slurry above. In conclusion, due to the cylindrical arrangement of the container and the segment model, the simulation of the measuring device can be closer to the real situation, and the obtained buoyancy data error is smaller.
Further setting: the vibrating device comprises a vibrating motor, and the vibrating motor is freely placed on the inner wall of the segment model.
By adopting the technical scheme, two groups of eccentric blocks are respectively arranged at two ends of a rotor shaft of the vibration motor, and the exciting force is obtained by utilizing the centrifugal force generated by the high-speed rotation of the shaft and the eccentric blocks. By freely placing the vibration motor on the inner wall of the segment model, the running of vehicles in the shield tunnel can be well simulated.
Further setting: the force measuring device is a tension meter, the tension meter is provided with a plurality of tension meters which are uniformly arranged along the axial direction of the container, and the measuring end of the tension meter is connected with the top of the segment model through a suspension device.
Through adopting above-mentioned technical scheme, section of jurisdiction model has certain length along the axial, and solitary tensiometer hardly keeps the balance of section of jurisdiction model. And the design of a plurality of tension meters can ensure that the segment model is suspended on the tube piece model without inclination, thereby avoiding the contact between the segment model and the container. Simultaneously, because the section of jurisdiction model is heavier, the thick liquid has inhomogeneous phenomenon to make everywhere buoyancy have the difference, and the measuring error of single tensiometer is great, uses a plurality of tensiometers to measure the back accumulation simultaneously, can eliminate the error to a certain extent.
Further setting: the suspension device comprises a support rod arranged along the axial direction of the container and a stay cable for connecting the side surface of the support rod with the top of the segment model, wherein one side of the support rod back to the stay cable is connected with the measuring end of the tension meter.
Through adopting above-mentioned technical scheme, the cable is a flexible connecting piece, and it can only follow length direction transmission pulling force and can not produce pressure, uses the cable to hang the section of jurisdiction model, compares in the bracing piece rigid connection section of jurisdiction model and the container of reference file, reduces the vibrations transmission of section of jurisdiction model inside and gives container and tensiometer, has still avoided simultaneously owing to set up improper and has pushed the risk of moving the section of jurisdiction model downwards. In addition, the setting of bracing piece for the gravity of section of jurisdiction model can be unified by the bracing piece burden, and each tensiometer is given in the reallocation, thereby reduces measuring error.
Further setting: the upper part of the container is provided with a pulp inlet and an exhaust port, and the lower part of the container is provided with a pulp outlet.
Through adopting above-mentioned technical scheme, go into thick liquid mouth and gas vent and set up in the upper portion of container, can conveniently pour into thick liquid into the container and discharge the inside air of container, compare in and set up in the lower part of container into thick liquid mouth, can avoid the inside thick liquid of container to rise gradually and produce the high pressure and produce the injection production of slurry and hinder. The slurry outlet is arranged at the lower part of the container, and the slurry can be automatically discharged from the slurry outlet by utilizing the gravity and the fluidity of the slurry.
Further setting: the top of the container is also provided with a pressure gauge.
Through adopting above-mentioned technical scheme, can monitor whether the container is inside to be full of by the thick liquid, simultaneously, when the thick liquid in the deep overburden layer of simulation, need pressurize the thick liquid, can detect container internal pressure through the pressure gauge, when the manometer reachs appointed number of degrees, stop the thick liquid and close into the thick liquid mouth can, convenient and reliable, and can make the simulation be close to reality more.
Further setting: the container is characterized in that a base is arranged on one side, close to the ground, of the container, the bottom surface of the base abuts against the ground, a supporting groove used for installing the container is formed in the top of the base, and the shape of the supporting groove is matched with that of the container.
Through adopting above-mentioned technical scheme, the container is more stable, can effectively simulate stable soil layer, avoids the container to rock and causes harmful effects to the measurement. In addition, the container is prevented from being directly pressed on the ground, the supporting grooves can uniformly support the side wall of the container, and the outer wall of the container is prevented from being damaged due to overlarge pressure.
To sum up, the utility model discloses following beneficial effect has: the pipe piece model and the container are arranged to be cylindrical by arranging the vibrating device, so that the actual situation is more approached, and the measured data obtained after simulation is more accurate; due to the internal structure arrangement of the force measuring device, the interference can be effectively reduced, the measurement error can be reduced, and the obtained data can be more accurate; the whole device is stable in structure, convenient to maintain and high in practicability.
Drawings
Fig. 1 is a schematic structural diagram of a shield tail synchronous grouting slurry buoyancy measuring device in this embodiment.
Fig. 2 is a left side view of the shield tail synchronous grouting slurry buoyancy measuring device in the embodiment.
In the figure, the position of the upper end of the main shaft,
1. a container; 11. a pulp inlet; 12. an exhaust port; 13. a pressure gauge; 14. a valve; 15. a pulp outlet;
2. a base; 21. a support groove;
3. a segment model;
4. a force measuring device; 41. a tension meter;
5. a vibration device; 51. a vibration motor; 52. a storage battery;
6. a suspension device; 61. a support bar; 62. a cable;
7. and (4) grouting pipes.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The utility model provides a shield tail synchronous slip casting thick liquid buoyancy measuring device, refer to figure 1, including the container 1 that is used for holding the thick liquid, a base 2 that is used for supporting container 1, section of jurisdiction model 3 of submergence in the thick liquid, and set up force measuring device 4 in container 1 top, the last buoyancy of tunnel model can be measured, and then utilize numerical simulation, analytic theory etc. to evaluate the mechanical properties and the displacement of construction period shield section of jurisdiction, solved current tunnel come-up model test device can't accurately measure the problem of the last buoyancy that section of jurisdiction model 3 receives.
Referring to fig. 1 and 2, the base 2 is in a table shape, the bottom surface of the base 2 abuts against the ground, the top of the base 2 is provided with a supporting groove 21, the supporting groove 21 is matched with the container 1 in shape, and the container 1 is installed in the supporting groove 21.
Referring to fig. 1, the container 1 is cylindrical and has an axis arranged in a horizontal direction, a slurry inlet 11, an exhaust port 12 and a pressure gauge 13 are formed at the highest point of the top of the container 1, and a slurry outlet 15 is formed at the bottom of the end wall of the container 1. The slurry inlet 11, the slurry outlet 15 and the exhaust port 12 are respectively provided with a valve 14 for controlling the opening and closing of the slurry inlet 11, the slurry outlet 15 and the exhaust port 12. The exhaust port 12 is covered with a waterproof and breathable material, preferably a waterproof and breathable film in this embodiment. When the container 1 needs to be grouted, the grouting pipe 7 is connected to the valve 14 of the grout inlet 11, then the valves 14 of the grout inlet 11 and the air outlet 12 are opened, grouting into the container 1 is started, and air pressed by the grout in the container 1 is exhausted through the air outlet 12. When the pressure gauge starts to indicate that the interior of the container 1 is filled with the slurry, the vent 12 is closed to prevent the slurry from overflowing and damaging the waterproof and breathable membrane. When the deep soil layer environment needs to be simulated, slurry is continuously injected into the container 1 to increase the pressure, and the reading of the pressure gauge 13 continuously rises. When the pressure measured by the pressure gauge 13 reaches a designated value, the valve 14 of the slurry inlet 11 is closed, and the grouting operation can be completed. When the slurry needs to be discharged, the valves 14 at the exhaust port 12 and the slurry outlet 15 need to be opened.
Referring to fig. 1, the top of the container 1 is provided with a force measuring device 4, in this embodiment the force measuring device 4 is a tension meter 41, the display of the tension meter 41 is located outside the container 1, and the measuring end of the tension meter 41 is located inside the container 1. As a preferred embodiment, the number of the tension meters 41 is four and the four tension meters are uniformly arranged along the axial direction of the container 1, so that the tension applied to the segment model 3 by the tension meters 41 uniformly acts on the segment model 3, and the segment model 3 is ensured not to tilt or rotate during the test. The segment model 3 in the container 1 is in a cylindrical shape, and the inner part of the segment model is hollow and the outer wall of the segment model is closed. The top of the segment model 3 is connected to the measuring end of the tension meter 41 via the suspension device 6. The suspension device 6 comprises a support rod 61 arranged along the axial direction of the container 1 and a bracing wire 62 connecting the side surface of the support rod 61 and the top of the segment model 3, and one side of the support rod 61 back to the bracing wire 62 is connected with the measuring end of the tension meter 41. The inside of segment model 3 is provided with vibrator 5, and vibrator 5 includes vibrating motor 51 and for the battery 52 of vibrating motor 51 power supply, vibrating motor 51 is freely placed on the inner wall of segment model 3.
The following description is made of the method for measuring buoyancy of synchronous grouting slurry at the tail of a shield in a middle shield according to the present invention with reference to the accompanying drawings.
Referring to fig. 1, the utility model discloses a shield tail synchronous grouting slurry buoyancy measuring method includes following steps:
a base 2 is provided and placed on a horizontal ground, and the container 1 is placed in the supporting recess 21 of the base 2.
After the vessel 1 is stationary and the interior segment model 3 is stabilized, the readings of each tension meter 41 are recorded and the first reading is summarized.
The battery 52 in the remote start container 1 is then energized with the vibration motor 51, the vibration motor 51 starts and starts vibrating, and the reading of the tension meter 41 starts to change in relation thereto. The individual tension meters 41 take their readings as they stabilize, or take their intermediate values as they float up and down, and aggregate a second reading.
To sum up, the buoyancy force applied to the segment model 3 is obtained by subtracting the second reading from the first reading.
The above-mentioned embodiments are merely illustrative of the present invention, and are not intended to limit the present invention, and those skilled in the art can make modifications of the present embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the present invention.
Claims (8)
1. A shield tail synchronous grouting slurry buoyancy measuring device comprises a container (1) for containing slurry, a segment model (3) immersed in the slurry, and a force measuring device (4) arranged above the container (1), wherein the measuring end of the force measuring device (4) is connected to the top of the segment model (3); the device is characterized by further comprising a vibration device (5) arranged inside the segment model (3).
2. The device for measuring the buoyancy of the slurry for synchronous grouting of the shield tail of the shield according to claim 1, wherein the container (1) and the segment model (3) are both arranged in a cylindrical shape.
3. The shield tail synchronous grouting slurry buoyancy measuring device according to claim 1, wherein the vibrating device (5) comprises a vibrating motor (51), and the vibrating motor (51) is freely placed on the inner wall of the segment model (3).
4. The shield tail synchronous grouting slurry buoyancy measuring device according to claim 1, wherein the force measuring device (4) is a tension meter (41), a plurality of tension meters (41) are uniformly arranged along the axial direction of the container (1), and the measuring end of each tension meter (41) is connected with the top of the segment model (3) through a suspension device (6).
5. The shield tail synchronous grouting slurry buoyancy measuring device according to claim 4, wherein the suspension device (6) comprises a support rod (61) arranged along the axial direction of the container (1) and a stay rope (62) connecting the side surface of the support rod (61) and the top of the segment model (3), and one side of the support rod (61) opposite to the stay rope (62) is connected with the measuring end of the tension meter (41).
6. The shield tail synchronous grouting slurry buoyancy measuring device according to claim 1, characterized in that a slurry inlet (11) and an exhaust port (12) are arranged at the upper part of the container (1), and a slurry outlet (15) is arranged at the lower part of the container (1).
7. The shield tail synchronous grouting slurry buoyancy measuring device according to claim 1, characterized in that a pressure gauge (13) is further arranged at the top of the container (1).
8. The shield tail synchronous grouting slurry buoyancy measuring device according to claim 1, wherein a base (2) is arranged on one side, close to the ground, of the container (1), the bottom surface of the base (2) abuts against the ground, a supporting groove (21) for installing the container (1) is formed in the top of the base (2), and the shape of the supporting groove (21) is matched with that of the container (1).
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| CN201921731075.1U CN210487229U (en) | 2019-10-14 | 2019-10-14 | Shield tail synchronous grouting slurry buoyancy measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921731075.1U CN210487229U (en) | 2019-10-14 | 2019-10-14 | Shield tail synchronous grouting slurry buoyancy measuring device |
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| CN210487229U true CN210487229U (en) | 2020-05-08 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113125066A (en) * | 2021-03-08 | 2021-07-16 | 浙江工业大学 | Device and method for testing floating force of single-ring duct piece |
| CN113418647A (en) * | 2021-06-22 | 2021-09-21 | 腾达建设集团股份有限公司 | Floating force testing device and method for shield segment in surrounding rock |
| CN114017041A (en) * | 2021-09-26 | 2022-02-08 | 深圳市市政工程总公司 | Monitoring method for shield tail pressure balance |
| CN114018465A (en) * | 2021-09-26 | 2022-02-08 | 深圳市市政工程总公司 | Monitoring device for shield tail pressure balance |
| CN114198107A (en) * | 2021-12-13 | 2022-03-18 | 西安交通大学 | Multifunctional reduced-scale shield model free of shield machine model and test method thereof |
| CN114235250A (en) * | 2021-12-01 | 2022-03-25 | 山东大学 | Device and method for testing longitudinal resultant force of duct piece in slurry |
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2019
- 2019-10-14 CN CN201921731075.1U patent/CN210487229U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113125066A (en) * | 2021-03-08 | 2021-07-16 | 浙江工业大学 | Device and method for testing floating force of single-ring duct piece |
| CN113418647A (en) * | 2021-06-22 | 2021-09-21 | 腾达建设集团股份有限公司 | Floating force testing device and method for shield segment in surrounding rock |
| CN114017041A (en) * | 2021-09-26 | 2022-02-08 | 深圳市市政工程总公司 | Monitoring method for shield tail pressure balance |
| CN114018465A (en) * | 2021-09-26 | 2022-02-08 | 深圳市市政工程总公司 | Monitoring device for shield tail pressure balance |
| CN114018465B (en) * | 2021-09-26 | 2023-11-17 | 深圳市市政工程总公司 | Monitoring device for shield tail pressure balance |
| CN114017041B (en) * | 2021-09-26 | 2024-01-30 | 深圳市政集团有限公司 | Monitoring method for shield tail pressure balance |
| CN114235250A (en) * | 2021-12-01 | 2022-03-25 | 山东大学 | Device and method for testing longitudinal resultant force of duct piece in slurry |
| CN114198107A (en) * | 2021-12-13 | 2022-03-18 | 西安交通大学 | Multifunctional reduced-scale shield model free of shield machine model and test method thereof |
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