CN210087322U - Shield constructs quick-witted lower existing shield tunnel analogue means of wearing - Google Patents
Shield constructs quick-witted lower existing shield tunnel analogue means of wearing Download PDFInfo
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- CN210087322U CN210087322U CN201920284516.1U CN201920284516U CN210087322U CN 210087322 U CN210087322 U CN 210087322U CN 201920284516 U CN201920284516 U CN 201920284516U CN 210087322 U CN210087322 U CN 210087322U
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- 238000004088 simulation Methods 0.000 claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 238000006073 displacement reaction Methods 0.000 claims abstract description 14
- 239000002689 soil Substances 0.000 claims description 26
- 238000009412 basement excavation Methods 0.000 claims description 9
- 229910052602 gypsum Inorganic materials 0.000 claims description 7
- 239000010440 gypsum Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 16
- 230000008569 process Effects 0.000 abstract description 11
- 238000010276 construction Methods 0.000 abstract description 10
- 230000005641 tunneling Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000009933 burial Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The utility model discloses complicated to shield tunnel job site simulation process, problem with high costs provides a shield constructs machine and has worn existing shield tunnel analogue means down, belongs to the tunnel engineering field. The simulation device comprises a model box, a loading beam, a jack, a steel sleeve and a shield segment model; the top of the model box is provided with an opening, a top plate is arranged at the opening, and the top plate is connected with the inner wall of the model box in a sliding manner; a jack is arranged on the top plate, and a loading beam is arranged on the jack; a shield tunnel model is arranged in the model box, an earth pressure cell and a strain gauge are arranged on the outer wall of the shield tunnel model, and displacement meters are circumferentially distributed on the outer side of the shield tunnel model; a starting port and a receiving port are symmetrically arranged on a model box below the shield tunnel model, and the central connecting line of the round hole is crossed with the axis of the shield tunnel model; the outer diameter of the steel sleeve is the same as that of the shield segment model and is smaller than the starting opening and the receiving opening. The simulation device can simply and orderly simulate the key steps of the whole process of the shield tunnel construction of the shield machine.
Description
Technical Field
The utility model belongs to the segment lining structure tunnel engineering field that adopts shield method construction such as city subway, highway tunnel, concretely relates to shield constructs machine and wears to have had shield tunnel analogue means down.
Background
With the continuous development of urban construction, the overground space cannot meet the traffic requirements of some large cities, a plurality of underground tunnels are actively constructed, a shield method is safer and more efficient compared with other excavation methods, the shield machine vertically downwards penetrates the existing shield tunnels more and more, great potential safety hazards exist when the shield vertically downwards penetrates the existing tunnels, and the problems of displacement change of the original shield tunnels, stress deformation of supporting structures and the like can be caused. Simulating the process helps to analyze problems in the construction process and thereby reduce the risk of the actual construction process. However, the simulation process of the shield tunnel construction site is complex and the cost is too high. It is therefore necessary to develop an indoor model simulation.
At present, some researches simulate the influence of the shield tunneling machine on the displacement and deformation of an upper building (structure) when the shield tunneling machine is worn downwards. However, in the case of performing a model test, since the force of the jack is directly applied to the surface of the model and the above-described structure is constructed on the surface of the ground, it is difficult to make the surface stress conform to the actual situation in the case of performing a simulation test, and it is difficult to effectively simulate the ground stress in which the shield machine is located. And the utility model discloses a shield constructs tunnel model and shield constructs machine excavation department and all in the great depths of stratum, can directly adjust the pressure of jack according to the shield tunnel buried depth, and needn't consider the error of earth's surface pressure. At present, no existing shield tunnel simulation device for the downward penetration of the shield machine is developed.
Disclosure of Invention
There is very big potential safety hazard when passing existing shield tunnel perpendicularly to the shield constructs the machine, and shield tunnel construction site simulation process is complicated, the above-mentioned problem of too high cost, the utility model provides a shield constructs machine and has worn existing shield tunnel analogue means down, has saved the complicated device of shield structure model, can succinctly orderly simulation shield construct machine and wear the key step that has had shield tunnel construction overall process down, accord with the engineering reality to easy operation.
The utility model aims at realizing through the following technical scheme:
a simulation device for a shield machine to penetrate through an existing shield tunnel comprises a model box filled with model soil inside, a loading beam, a jack, a steel sleeve and a shield segment model; the top of the model box is provided with an opening, a top plate is arranged at the opening, and the top plate is connected with the inner wall of the model box in a sliding manner; a jack is arranged on the top plate, and a loading beam is arranged on the jack;
a shield tunnel model is arranged in the model box, an earth pressure cell and a strain gauge are arranged on the outer wall of the shield tunnel model, and displacement meters are distributed on the outer side of the shield tunnel model in the circumferential direction;
two circular holes with the same size are symmetrically formed in a model box below the shield tunnel model and are respectively used as an initial opening and a receiving opening for simulating shield machine excavation, and the central connecting line of the circular holes and the axis of the shield tunnel model are in a cross shape;
the shield segment models are connected into a ring by gypsum;
the outer diameter of the steel sleeve is the same as that of the shield segment model and is smaller than the diameters of the starting opening and the receiving opening.
Furthermore, the jack is three, and the position of the centroid of jack and roof contact surface is directly over the shield tunnel model axis, and two jacks symmetry set up the edge at the roof, and one sets up the center department at the roof.
Furthermore, the material of the model box is transparent acrylic material.
Further, the model soil is sandy soil.
Further, the shield tunnel model is made of gypsum materials.
The utility model has the advantages of it is following: the operation is simple, and the required operators are few; the complex device of the shield model is omitted, the shield shell is only needed to be simulated by the steel sleeve for excavation, and the prefabricated duct pieces are used for supporting, so that the key steps of the whole construction process of the existing shield tunnel can be simply and orderly simulated by the shield machine; applying a certain pressure by using a jack and transmitting the certain pressure to a model box top plate, and then transmitting the certain pressure to model soil by using the model box top plate so as to simulate the pressure stress of the actual buried deep soil of the tunnel, thereby being more in line with the engineering practice; the method can effectively simulate the influence caused when the shield machine passes through the existing shield tunnel, and provides a more reliable and effective model test method for the shield tunnel to pass through the excavated tunnel construction research.
Drawings
Fig. 1 is a schematic front view of an existing shield tunnel simulation device under a shield tunneling machine in an embodiment of the present invention;
fig. 2 is a schematic side view of the shield tunneling machine of the embodiment of the present invention passing through the existing shield tunnel simulation apparatus;
fig. 3 is a schematic diagram of the position of the jack on the top plate according to the embodiment of the present invention;
fig. 4 is a schematic diagram of the positions of the soil pressure cell and the strain gauge on the shield tunnel model according to the embodiment of the present invention;
fig. 5 is the embodiment of the utility model provides an embodiment shield constructs the structure sketch map of section of jurisdiction model.
In the above figures: 1. a load beam; 2. a jack; 3. a shield tunnel model; 31. a soil pressure cell; 32. a strain gauge; 4. model soil; 5. a steel sleeve; 6. an originating port; 7. a receiving port; 8. a shield segment model; 9. a displacement meter; 10. a model box; 11. a top plate.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and accompanying drawings.
Examples
The embodiment provides a shield tunneling simulation device for a shield tunneling machine to penetrate through an existing shield tunneling, and as shown in fig. 1-2, the shield tunneling simulation device comprises a cuboid-shaped model box 10 made of transparent acrylic materials, sand filled in the model box is used as model soil 4, a shield tunneling model 3 made of gypsum materials is arranged in the model soil, a soil pressure box 31 and a strain gauge 32 are adhered to the outer wall of the shield tunneling model 3, a displacement meter 9 is arranged on the outer side of the shield tunneling model 3 in the circumferential direction, and no fixed connection relation exists between the displacement meter 9 and the shield tunneling model 3.
Two circular holes with the same size are symmetrically formed in the wall of a model box 4 below a shield tunnel model 3 and are respectively used as a starting opening 6 and a receiving opening 7 for simulating shield machine excavation, the central connecting line of the starting opening 6 and the receiving opening 7 is in a cross shape with the axis of the tunnel model, and the starting opening 6 and the receiving opening 7 have enough distance from the shield tunnel model 3.
The simulation device further comprises a steel sleeve 5 and a shield segment model 8 made of gypsum, wherein the outer diameter of the steel sleeve 5 is the same as that of the shield segment model 8, and the outer diameter of the steel sleeve 5 is smaller than the diameters of the starting opening 6 and the receiving opening 7.
The top of the model box is opened, a top plate 11 is arranged at the opening, the top plate 11 is in sliding connection with the inner wall of the model box 10, three jacks 2 and a loading beam 1 are arranged above the top plate 11, the centroid of the contact surface of the jacks 2 and the top plate 11 is positioned right above the axis of the shield tunnel model, as shown in fig. 3, the two jacks 2 are symmetrically arranged at the edge of the top plate 11, and one jack is arranged at the center of the top plate 11. After the jack 1 is started, certain pressure is transmitted to the top plate 11, the top plate 11 moves towards the bottom of the model box 4, and the top plate transmits the pressure to the model soil 4 so as to simulate the pressure stress of the actual deep-buried soil of the tunnel.
Utilize this shield structure machine to wear to have shield tunnel analogue means down, through pre-buried shield tunnel model, the stress in the jack pressurization simulation stratum, the mode of excavating is carried out with steel sleeve simulation shield shell, and the process of wearing to have shield tunnel under the simulation shield structure includes following step:
the method comprises the following steps: attaching the strain gauge 32 and the soil pressure box 31 to the outer surface of the shield tunnel model 3, embedding the shield tunnel model 3 and the displacement meter 9 in the model box 10 together, arranging the displacement meter 9 along the circumferential direction of the shield tunnel model 3, connecting the strain gauge 32, the soil pressure box 31 and the displacement meter 9 to a data acquisition system through leads, in order to ensure the accuracy of the embedding position, putting the model soil 4 into the model box 10 in multiple layers, and putting the next layer of model soil after each layer of model soil is compacted and stabilized, wherein the thickness of each layer of model soil is not more than 10 cm;
step two: covering a top plate 11, starting a jack 2, transmitting a certain pressure to the top plate 11, and transmitting the pressure to the model soil 4 by the top plate 11 to simulate the ground stress of the tunnel burial depth;
step three: after the jack pressure and the soil displacement are stable, reading initial data of the soil pressure box 31, the strain gauge 32 and the displacement meter 9 through a data acquisition system;
step four: placing the steel sleeve 5 into the starting opening 6 for excavation and supporting, excavating slowly in the steel sleeve 5 by using a small shovel, taking out excavated dregs in time, monitoring the excavation distance by using a steel ruler, placing a shield segment model 8 prefabricated in advance into a tunnel for segment supporting every time the distance from excavation to the width of the shield segment model 8 is reached, connecting segments by using gypsum, and circularly excavating and supporting to a receiving opening 7;
step five: when a certain distance is excavated, the data of the soil pressure box 31, the strain gauge 32 and the displacement gauge 9 are read through the data acquisition system, so that the influence of the process of the shield tunneling through the existing shield tunnel on the existing shield tunnel is obtained.
In the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be understood in a broad sense, and may be, for example, a fixed connection, a detachable connection, or an integral connection; they may be connected directly or indirectly through an intermediate. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (5)
1. A simulation device for a shield machine to penetrate through an existing shield tunnel is characterized by comprising a model box filled with model soil, a loading beam, a jack, a steel sleeve and a shield segment model; the top of the model box is provided with an opening, a top plate is arranged at the opening, and the top plate is connected with the inner wall of the model box in a sliding manner; a jack is arranged on the top plate, and a loading beam is arranged on the jack;
a shield tunnel model is arranged in the model box, an earth pressure cell and a strain gauge are arranged on the outer wall of the shield tunnel model, and displacement meters are distributed on the outer side of the shield tunnel model in the circumferential direction;
two circular holes with the same size are symmetrically formed in a model box below the shield tunnel model and are respectively used as an initial opening and a receiving opening for simulating shield machine excavation, and the central connecting line of the circular holes and the axis of the shield tunnel model are in a cross shape;
the shield segment models are connected into a ring by gypsum;
the outer diameter of the steel sleeve is the same as that of the shield segment model and is smaller than the diameters of the starting opening and the receiving opening.
2. The simulation device of claim 1, wherein the number of the jacks is three, the centroid of the contact surface of the jacks and the top plate is positioned right above the axis of the shield tunnel model, two jacks are symmetrically arranged at the edge of the top plate, and one jack is arranged at the center of the top plate.
3. The simulation apparatus of claim 1, wherein the mold box is made of a transparent acrylic material.
4. The simulation apparatus of claim 1, wherein the model soil is sandy soil.
5. The simulation apparatus of claim 1, wherein the shield tunnel model is made of gypsum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920284516.1U CN210087322U (en) | 2019-03-06 | 2019-03-06 | Shield constructs quick-witted lower existing shield tunnel analogue means of wearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920284516.1U CN210087322U (en) | 2019-03-06 | 2019-03-06 | Shield constructs quick-witted lower existing shield tunnel analogue means of wearing |
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| Publication Number | Publication Date |
|---|---|
| CN210087322U true CN210087322U (en) | 2020-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920284516.1U Active CN210087322U (en) | 2019-03-06 | 2019-03-06 | Shield constructs quick-witted lower existing shield tunnel analogue means of wearing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109826633A (en) * | 2019-03-06 | 2019-05-31 | 青岛理工大学 | Device and method for simulating shield machine to penetrate existing shield tunnel downwards |
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- 2019-03-06 CN CN201920284516.1U patent/CN210087322U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109826633A (en) * | 2019-03-06 | 2019-05-31 | 青岛理工大学 | Device and method for simulating shield machine to penetrate existing shield tunnel downwards |
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