CN110657943A - Experimental device for simulating shield tunnel segment floating - Google Patents
Experimental device for simulating shield tunnel segment floating Download PDFInfo
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- CN110657943A CN110657943A CN201910995861.0A CN201910995861A CN110657943A CN 110657943 A CN110657943 A CN 110657943A CN 201910995861 A CN201910995861 A CN 201910995861A CN 110657943 A CN110657943 A CN 110657943A
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Abstract
The invention discloses an experimental device for simulating upward floating of a shield tunnel segment, which comprises an inner cylinder for simulating the tunnel segment, an outer cylinder forming a gap with the inner cylinder, baffles at two ends for fixing and sealing the outer cylinder, a displacement sensor for measuring upward floating displacement of the inner cylinder, a top plate, an adjusting device and a positioning device, wherein two ends of the inner cylinder are of a closed structure, the outer cylinder is sleeved on the inner cylinder, and the inner cylinder and the outer cylinder are coaxial as a whole; the top plate is positioned above the outer cylinder, the top of the inner cylinder is connected with the top plate through a positioning device, and a positioning nut is arranged above the position where the positioning device penetrates through the outer cylinder; the top of the outer barrel is connected with the top plate through an adjusting device, and an adjusting nut is arranged above the adjusting device penetrating through the top plate; the top plate is connected with a displacement sensor. The invention researches and studies the influence of different slurry on the upward floating of the duct piece by injecting different types of slurry under the action of constant external force, and can also adjust the external force acting on the inner cylinder by changing the weight of a heavy object and research the upward floating process of the inner cylinder under the action of different external force.
Description
Technical Field
The invention belongs to the technical field of shield construction engineering, and particularly relates to an experimental device for simulating floating of shield tunnel segments.
Background
The shield construction method has the advantages of multiple aspects and is widely applied to the construction of urban subway tunnels. During construction by a shield method, the segments are assembled in the shield shell, the segments are separated from the shield tail along with forward propulsion of a shield machine, an annular gap is formed between the segments and a stratum, synchronous grouting is required to be carried out in the annular gap for controlling stratum displacement, and injected slurry is a mixture of water, cement, fly ash, an additive and the like. Before the slurry is solidified, the slurry is in a flowable state, and according to the Archimedes buoyancy principle, the slurry can generate buoyancy on the pipe piece, so that the pipe piece floats upwards. Duct piece dislocation can appear after the duct piece come-up, forms dislocation crack, reduces duct piece sealing quality, produces the phenomenon such as duct piece water leakage, consequently seems especially important to the research of duct piece come-up problem.
The section of jurisdiction is surrounded by the thick liquid in the actual engineering, and under thick liquid buoyancy, the section of jurisdiction come-up is arranged and is opened upper portion thick liquid, and the thick liquid flows down along the annular gap, and section of jurisdiction and thick liquid are all in motion state. By consulting related documents, Chinese patent CN108872297A discloses a model test device for shield tail grouting slurry condensation and segment floating process, when the device is used for testing, model soil is placed in a model box, a pressure box and other displacement sensors are pre-embedded in the model soil, a consolidation compression plate is placed on the upper side of the model soil, a compaction mechanism is used for applying pressure to the consolidation compression plate, and the model soil is compacted so as to simulate real soil layer compactness; and then taking out the consolidation compression plate, fixing the steel pipe piece model at the upper end of the model box through bolts, grouting between the steel pipe piece model and model soil through the side wall of the model box and grouting ports on the steel pipe piece model, pressing the model soil through the loading plate by using a pressing mechanism to simulate formation pressure, and controlling the pressure of the loading plate to simulate the floating process of the pipe piece in the solidification process of slurry.
Among the experimental apparatus of above-mentioned patent, the steel-pipe piece model is the rigid, can not simulate the come-up process of section of jurisdiction, also can not simulate the flow process of thick liquid along the annular gap, consequently can not simulate the come-up process of section of jurisdiction in the actual engineering. The buoyancy of the duct piece can not be measured, the buoyancy change rule in the floating process of the duct piece can be researched, and the influence of different slurry on the buoyancy of the duct piece can not be researched.
Disclosure of Invention
Based on the problems in the prior art, the invention aims to provide a model experiment device for testing the synchronous grouting slurry property of a shield tunnel.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention relates to an experimental device for simulating the floating of a shield tunnel segment, which comprises an inner cylinder for simulating the tunnel segment, an outer cylinder forming a gap with the inner cylinder, baffles at two ends for fixing and sealing the outer cylinder, a displacement sensor for measuring the floating displacement of the inner cylinder, a top plate, an adjusting device and a positioning device, wherein two ends of the inner cylinder are of a closed structure, the outer cylinder is sleeved on the inner cylinder, and the inner cylinder and the outer cylinder are coaxial as a whole; the top plate is positioned above the outer cylinder, the top of the inner cylinder is connected with the top plate through a positioning device, and a positioning nut is arranged above the position where the positioning device penetrates through the outer cylinder; the top of the outer barrel is connected with the top plate through an adjusting device, and an adjusting nut is arranged above the adjusting device penetrating through the top plate; the top plate is connected with a displacement sensor; the lateral part of the baffle is provided with a grouting device which is communicated with the gap between the inner cylinder and the outer cylinder.
Preferably, the device also comprises an external frame for providing external force for floating the inner cylinder, and the external frame is arranged on the outer side of the baffle; be equipped with gravity mechanism on the external frame, gravity mechanism include two fixed pulleys, haulage rope and heavy object, one of them fixed pulley is installed directly over the roof, another side top of installing at the roof, the haulage rope connect on two fixed pulleys, the one end and the roof of haulage rope are connected, the other end hangs the heavy object.
Preferably, the adjusting devices are symmetrically arranged on two sides of the center of the top plate and comprise adjusting screw rods and adjusting nuts, the lower ends of the adjusting screw rods are fixedly connected with the outer barrel through fixed end nuts embedded in the top of the outer barrel, and the upper ends of the adjusting screw rods are connected to the top plate through the adjusting nuts.
Preferably, the positioning device comprises a positioning screw and a positioning nut, the positioning screw is located on two sides of the adjusting device, two first holes are formed in the top of the outer barrel, the positioning screw penetrates through the first holes, the lower end of the positioning screw is fixedly connected with the inner barrel through a fixed end nut embedded in the top of the inner barrel, the middle of the positioning screw is connected with the top of the outer barrel through the positioning nut, and the top of the positioning screw is fixed with the top plate through the fixing nut.
Preferably, the grouting device comprises a grouting pipe, a flow regulating valve and a funnel, the lower end of the grouting pipe penetrates through the baffle plate to be communicated with the inner space of the outer barrel, the funnel is arranged at the upper end of the grouting pipe, and the flow regulating valve is arranged on the grouting pipe.
Preferably, four edges of the baffle are respectively provided with a second hole, the connecting rod penetrates through the second holes to connect the baffle with two sides of the outer barrel, and two ends of the connecting rod are fixed through connecting nuts.
Preferably, the inner cylinder and the outer cylinder are made of transparent materials, two ends of the outer cylinder are of an open structure, and the outer cylinder is provided with an air outlet. The air outlet on the outer cylinder is used for discharging air in the outer cylinder when grouting is carried out in the outer cylinder.
Preferably, the outer surface of the inner barrel is wrapped with a metal mesh, and cement slurry is smeared on the outer surface of the metal mesh. The surface condition of the reinforced concrete segment can be simulated, and the cement paste can be coated after the outer surface of the inner cylinder is polished to be rough or coated after materials such as metal mesh, cloth and the like are wrapped.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
1. the device simulates stratum by the inner cylinder simulation duct piece and the outer cylinder simulation stratum, and injects slurry into the outer cylinder to simulate the floating process of the duct piece.
2. The invention measures the displacement condition of the inner cylinder floating through the displacement sensor, and the measurement is accurate.
3. According to the invention, the influence of different slurries on the upward floating of the duct piece is researched and researched by injecting different types of slurries under the action of constant external force.
4. The invention adjusts the external force acting on the inner cylinder by changing the weight of the heavy object, and researches the floating process of the inner cylinder under the action of different external forces.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view in example 2 of the present invention;
FIG. 3 is a side view in embodiment 2 of the present invention;
fig. 4 is a schematic view of the structure of the baffle plate in the present invention.
Description of the labels in the schematic:
1-an inner cylinder; 2-outer cylinder; 3-a baffle plate; 4-a displacement sensor; 5-a regulating device; 6-a positioning device; 7-a top plate; 8-grouting devices; 9-a connecting rod; 10-a connecting nut; 11-an outer frame; 12 gravity mechanism, 13-fixed pulley; 14-a hauling rope; 15-weight; 16-fixing end nuts; 21-a first hole; 22-air outlet holes; 31-a second hole; 51-adjusting screw; 52-an adjusting nut; 61-positioning screw; 62-positioning nut; 63-fixing the nut; 81-grouting pipe; 82-a flow regulating valve; and 83-a funnel.
Detailed Description
For further understanding of the present invention, the present invention will be described in detail with reference to examples, which are provided for illustration of the present invention but are not intended to limit the scope of the present invention.
Example 1
As shown in fig. 1, the present embodiment relates to an experimental apparatus for simulating shield tunnel segment floating, which includes an inner cylinder 1 for simulating a tunnel segment, an outer cylinder 2 forming a gap with the inner cylinder 1, two end baffles 3 for fixing and sealing the outer cylinder 2, a displacement sensor 4 for measuring floating displacement of the inner cylinder 1, a top plate 7, an adjusting device 5 and a positioning device 6, wherein two ends of the inner cylinder 1 are of a closed structure, the outer cylinder 2 is sleeved on the inner cylinder 1, and the inner cylinder 1 and the outer cylinder 2 are generally coaxial; the top plate 7 is positioned above the outer cylinder 2, the top of the inner cylinder 1 is connected with the top plate 7 through a positioning device 6, and a positioning nut 62 is arranged above the position where the positioning device 6 penetrates through the outer cylinder 2; the top of the outer cylinder 2 is connected with a top plate 7 through an adjusting device 5, and an adjusting nut 52 is arranged above the position where the adjusting device 5 penetrates through the top plate 7; the top plate 7 is connected with the displacement sensor 4; a grouting device 8 is arranged at the side part of the baffle 3, and the grouting device 8 is communicated with the gap between the inner cylinder and the outer cylinder.
As shown in fig. 3 and 4, the baffle 3 is provided with second holes 31 at four corners, the connecting rod 9 passes through the second holes 31 to connect the baffle 3 with two sides of the outer cylinder 2, and two ends of the connecting rod 9 are fixed by the connecting nuts 10.
As shown in fig. 1, the adjusting devices 5 are symmetrically arranged on two sides of the center of the top plate 7, the adjusting devices 5 include adjusting screws 51 and adjusting nuts 52, the lower ends of the adjusting screws 51 are fixedly connected with the outer cylinder 2 through fixed end nuts 16 embedded in the top portion 2 of the outer cylinder, and the upper ends of the adjusting screws 51 are connected to the top plate 7 through the adjusting nuts 52. Positioner 6 include positioning screw 61 and set nut 62, positioning screw 61 is located adjusting device 5's both sides, 2 tops of urceolus be equipped with two first holes 21, positioning screw 61 passes first hole 21, the lower extreme of positioning screw 61 is through the solid end nut 16 and the inner tube 1 fixed connection at embedded 1 top of inner tube, positioning screw 61 middle part is passed through set nut 62 and is connected with 2 tops of urceolus, positioning screw 61 top is fixed with roof 7 through fixation nut 63.
The inner barrel 1 and the outer barrel 2 are made of transparent materials, two ends of the outer barrel 2 are of an open structure, and the outer barrel 2 is provided with an air outlet 22. The air outlet hole 22 on the outer cylinder 2 is used for discharging air in the outer cylinder 2 when grouting into the outer cylinder 2. The outer surface of the inner cylinder 1 is wrapped with a metal net, and cement paste is smeared on the outer surface of the metal net. The surface condition of the reinforced concrete segment can be simulated, and cement paste can be coated after the outer surface of the inner cylinder 1 is polished to be rough or coated after materials such as metal mesh, cloth and the like are wrapped.
The specific installation process of this embodiment is as follows:
the method comprises the following steps: the top of the inner cylinder 1 is embedded with a fixed end nut 16, the inner cylinder 1 is arranged in the outer cylinder 2, the two fixed end nuts 16 of the inner cylinder 1 are aligned with the two second holes 21 of the outer cylinder, and a positioning screw 61 penetrates through the second holes 21 and is screwed on the fixed end nuts 16 on the top of the inner cylinder 1; a positioning nut 62 is screwed into the positioning screw 61, and the position of the positioning nut 62 is adjusted so that the inner cylinder 1 and the outer cylinder 2 are generally coaxial.
Step two: a small amount of vaseline is smeared on the end face of the outer barrel 2, the baffles 3 on the two sides press the outer barrel 2, the first holes 31 at the four corners of the baffles 3 on the two sides penetrate into the connecting rod 9, and the connecting nut 10 is screwed to tightly press and seal the baffles 3 on the two sides and the outer barrel 2.
Step three: the adjusting screw 51 is installed in the fixed end nut 16 embedded in the top of the outer cylinder 2. The fixing nut 63 on the lower side of the top plate 7 is screwed into the positioning screw 61, the top plate 7 is placed on the fixing nut 63, and then the fixing nut 63 on the upper side of the top plate 7 is screwed, so that the top plate 7 can be clamped by the two upper and lower fixing nuts 63. The adjusting nut 52 is screwed into the adjusting screw 51 and contacts the top plate 7. A displacement sensor 4 is mounted below the top plate 7, the displacement sensor 4 is fixed on a magnetic gauge stand (not shown in the figure), and the position of the displacement sensor 4 is adjusted to keep good contact with the top plate 7 when the top plate is lifted. The displacement sensor 4 is connected to a data acquisition instrument (not shown). The grout pipe 81 is attached to the baffle 3.
The present embodiment uses the principle:
the method comprises the following steps: after the experimental device is debugged, sufficient slurry is mixed, the slurry is injected into the gap between the inner barrel 1 and the outer barrel 2 through the grouting pipe 81, air in the outer barrel 2 is discharged from the air outlet 22, and the regulating valve 82 is closed until the whole gap is filled with the slurry.
Step two: after the device is integrally stable, the adjusting nut 52 is unscrewed, the inner cylinder 1 floats upwards under the action of buoyancy, the inner cylinder 1 drives the positioning device 6 to move upwards, the positioning device 6 drives the top plate 7 to move upwards, so that the top plate is driven to float upwards, the floating process is observed, and the floating displacement development process is recorded by the displacement sensor 4. And (4) after the test is finished, detaching the baffle 3, taking out the inner cylinder 1 and cleaning the test device.
Example 2
As shown in fig. 2, the present embodiment relates to an experimental apparatus for simulating shield tunnel segment floating, which includes an inner cylinder 1 for simulating tunnel segment, an outer cylinder 2 forming a gap with the inner cylinder 1, two end baffles 3 for fixing and sealing the outer cylinder 2, a displacement sensor 4 for measuring floating displacement of the inner cylinder 1, a top plate 7, an adjusting device 5, a positioning device 6 and an external frame 11, wherein two ends of the inner cylinder 1 are of a closed structure, the outer cylinder 2 is sleeved on the inner cylinder 1, and the inner cylinder 1 and the outer cylinder 2 are generally coaxial; the top plate 7 is positioned above the outer cylinder 2, the top of the inner cylinder 1 is connected with the top plate 7 through a positioning device 6, and a positioning nut 62 is arranged above the position where the positioning device 6 penetrates through the outer cylinder 2; the top of the outer cylinder 2 is connected with a top plate 7 through an adjusting device 5, and an adjusting nut 52 is arranged above the position where the adjusting device 5 penetrates through the top plate 7; the top plate 7 is connected with the displacement sensor 4; a grouting device 8 is arranged at the side part of the baffle 3, and the grouting device 8 is communicated with the gap between the inner cylinder and the outer cylinder. The outer frame 11 is arranged on the outer side of the baffle 3; be equipped with gravity mechanism 12 on the outer frame 11, gravity mechanism 12 include two fixed pulleys 13, haulage rope 14 and heavy object 15, one of them fixed pulley 13 is installed directly over roof 7, another side top of installing roof 7, haulage rope 14 connect on two fixed pulleys 13, haulage rope 14's one end is connected with roof 7, the other end hangs heavy object 15.
As shown in fig. 3 and 4, the baffle 3 is provided with second holes 31 at four corners, the connecting rod 9 passes through the second holes 31 to connect the baffle 3 with two sides of the outer cylinder 2, and two ends of the connecting rod 9 are fixed by the connecting nuts 10.
As shown in fig. 2, the adjusting devices 5 are symmetrically arranged at the left and right sides of the center of the top plate 7, each adjusting device 5 comprises an adjusting screw 51 and an adjusting nut 52, the lower end of the adjusting screw 51 is fixedly connected with the outer cylinder 2 through a fixed end nut 16 embedded at the top of the outer cylinder 2, and the upper end of the adjusting screw 51 is connected to the top plate 7 through the adjusting nut 52. Positioner 6 include positioning screw 61 and set nut 62, positioning screw 61 is located adjusting device 5's the outside, 2 tops of urceolus be equipped with two first holes 21, positioning screw 61 passes first hole 21, the lower extreme of positioning screw 61 is through the solid end nut 16 and the inner tube 1 fixed connection at embedded 1 top of inner tube, positioning screw 61 middle part is passed through set nut 62 and is connected with 2 tops of urceolus, positioning screw 61 top is fixed with roof 7 through fixation nut 63.
The inner barrel 1 and the outer barrel 2 are made of transparent materials, two ends of the outer barrel 2 are of an open structure, and the outer barrel 2 is provided with an air outlet 22. The air outlet 22 on the outer cylinder 2 is used for discharging air in the outer cylinder 2 when grouting in the outer cylinder 2. The outer surface of the inner cylinder 1 is wrapped with a metal net, and cement paste is smeared on the outer surface of the metal net. The surface condition of the reinforced concrete segment can be simulated, and cement paste can be coated after the outer surface of the inner cylinder 1 is polished to be rough or coated after materials such as metal mesh, cloth and the like are wrapped.
The specific installation process of this embodiment is as follows:
the method comprises the following steps: the top of the inner cylinder 1 is embedded with a fixed end nut 16, the inner cylinder 1 is arranged in the outer cylinder 2, the two fixed end nuts 16 of the inner cylinder 1 are aligned with the two first holes 21 of the outer cylinder, and a positioning screw 61 penetrates through the first holes 21 and is screwed on the fixed end nuts 16 on the top of the inner cylinder 1; a positioning nut 62 is screwed into the positioning screw 61, and the position of the positioning nut 62 is adjusted so that the inner cylinder 1 and the outer cylinder 2 are generally coaxial.
Step two: and (3) smearing a small amount of vaseline on the end face of the outer barrel 2, pressing the outer barrel 2 by the baffles 3 at the two sides, penetrating the connecting rod 9 into the second holes 31 at the four corners of the baffles 3 at the two sides, and screwing the connecting nut 10 to tightly press and seal the baffles 3 at the two sides and the outer barrel 2.
Step three: the adjusting screw 51 is installed in the fixed end nut 16 embedded in the top of the outer cylinder 2. The fixing nut 63 on the lower side of the top plate 7 is screwed into the positioning screw 61, the top plate 7 is placed on the fixing nut 63, and then the fixing nut 63 on the upper side of the top plate 7 is screwed, so that the top plate 7 can be clamped by the two upper and lower fixing nuts 63. The adjusting nut 52 is screwed into the adjusting screw 51 and contacts the top plate 7. A displacement sensor 4 is mounted below the top plate 7, the displacement sensor 4 is fixed on a magnetic gauge stand (not shown in the figure), and the position of the displacement sensor 4 is adjusted to keep good contact with the top plate 7 when the top plate is lifted. The displacement sensor 4 is connected to a data acquisition instrument (not shown), and the grouting pipe 81 is attached to the baffle 3.
Step four: an outer frame 11 is erected outside the baffle 3, two fixed pulleys 13 are fixed on the outer frame 11 above the top plate 7, a traction rope 14 penetrates through one ends of the two fixed pulleys 13 to be connected with the middle position of the top plate, and a heavy object 15 is hung at the other end of the traction rope.
The present embodiment uses the principle:
the method comprises the following steps: after the experimental device is debugged, sufficient slurry is mixed, the slurry is injected into the gap between the inner barrel 1 and the outer barrel 2 through the grouting pipe 81, air in the outer barrel 2 is discharged from the air outlet 22, and the regulating valve 82 is closed until the whole gap is filled with the slurry.
Step two: after the device is integrally stable, the adjusting nut 52 is unscrewed, the inner cylinder 1 finishes the floating process through the fixed pulley 13 under the action of external force provided by the weight 15, the floating process is observed, and the floating displacement development process is recorded by the displacement sensor 4.
Step three: changing the weight of the weight 15, repeating the first step and the second step, and researching the floating process of the inner cylinder under the action of different external forces.
Step four: injecting different types of slurry, and repeating the first step, the second step and the third step to study the influence of different types of slurry on the floating process of the inner barrel 1, thereby determining the properties of different types of slurry. And (4) after the test is finished, detaching the baffle 3, taking out the inner cylinder 1 and cleaning the test device.
The present invention and its embodiments have been described above schematically, without limitation, and the embodiments of the present invention are shown in the drawings, and the actual structures are not limited thereto. Therefore, those skilled in the art should understand that they can easily and effectively design and modify the structure and embodiments of the present invention without departing from the spirit and scope of the present invention.
Claims (8)
1. An experimental device for simulating the upward floating of a shield tunnel segment is characterized by comprising an inner cylinder for simulating the tunnel segment, an outer cylinder forming a gap with the inner cylinder, baffles at two ends for fixing and sealing the outer cylinder, a displacement sensor for measuring the upward floating displacement of the inner cylinder, a top plate, an adjusting device and a positioning device, wherein two ends of the inner cylinder are of a closed structure, the outer cylinder is sleeved on the inner cylinder, and the inner cylinder and the outer cylinder are coaxial as a whole; the top plate is positioned above the outer cylinder, the top of the inner cylinder is connected with the top plate through a positioning device, and a positioning nut is arranged above the position where the positioning device penetrates through the outer cylinder; the top of the outer barrel is connected with the top plate through an adjusting device, and an adjusting nut is arranged above the adjusting device penetrating through the top plate; the top plate is connected with a displacement sensor; the lateral part of the baffle is provided with a grouting device which is communicated with the gap between the inner cylinder and the outer cylinder.
2. The experimental device for simulating the floating of the shield tunnel segment according to claim 1, further comprising an external frame for providing external force for floating of the inner cylinder, wherein the external frame is arranged outside the baffle; be equipped with gravity mechanism on the external frame, gravity mechanism include two fixed pulleys, haulage rope and heavy object, one of them fixed pulley is installed directly over the roof, another side top of installing at the roof, the haulage rope connect on two fixed pulleys, the one end and the roof of haulage rope are connected, the other end hangs the heavy object.
3. The experimental device for simulating the floating of the shield tunnel segment as claimed in claim 1, wherein the adjusting devices are symmetrically arranged at two sides of the center of the top plate, each adjusting device comprises an adjusting screw and an adjusting nut, the lower end of each adjusting screw is fixedly connected with the outer cylinder through a fixed end nut embedded at the top of the outer cylinder, and the upper end of each adjusting screw is connected to the top plate through the adjusting nut.
4. The experimental device for simulating the floating of the shield tunnel segment according to claim 3, wherein the positioning device comprises positioning screws and positioning nuts, the positioning screws are located on two sides of the adjusting device, two first holes are formed in the top of the outer cylinder, the positioning screws penetrate through the first holes, the lower ends of the positioning screws are fixedly connected with the inner cylinder through fixed end nuts embedded in the top of the inner cylinder, the middle of the positioning screws are connected with the top of the outer cylinder through the positioning nuts, and the top of the positioning screws is fixed with the top plate through the fixing nuts.
5. The experimental device for simulating the floating of the shield tunnel segment according to claim 1, wherein the grouting device comprises a grouting pipe, a flow regulating valve and a funnel, the lower end of the grouting pipe penetrates through the baffle plate to be communicated with the inner space of the outer cylinder, the funnel is installed at the upper end of the grouting pipe, and the flow regulating valve is installed on the grouting pipe.
6. The experimental device for simulating the floating of the shield tunnel segment as claimed in claim 1, wherein the four corners of the baffle are respectively provided with a second hole, the connecting rod passes through the second holes to connect the baffle with two sides of the outer cylinder, and two ends of the connecting rod are fixed by connecting nuts.
7. The experimental device for simulating the floating of the shield tunnel segment as claimed in claim 1, wherein the inner cylinder and the outer cylinder are made of transparent materials, two ends of the outer cylinder are open structures, the top of the outer cylinder is provided with air outlets, and the outer cylinder is made of transparent materials.
8. The experimental device for simulating the floating of the shield tunnel segment as claimed in claim 1, wherein the outer surface of the inner cylinder is wrapped with a metal mesh, cement slurry is coated on the outer surface of the metal mesh, and the inner cylinder is made of transparent material.
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| CN201910995861.0A CN110657943B (en) | 2019-10-18 | 2019-10-18 | Experimental device for simulating shield tunnel segment floating |
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| CN201910995861.0A CN110657943B (en) | 2019-10-18 | 2019-10-18 | Experimental device for simulating shield tunnel segment floating |
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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 |
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| CN110657943B (en) | 2021-09-28 |
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