CN110646164A - Experimental device for simulation shield tunnel section of jurisdiction come-up process - Google Patents
Experimental device for simulation shield tunnel section of jurisdiction come-up process Download PDFInfo
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- CN110646164A CN110646164A CN201910995863.XA CN201910995863A CN110646164A CN 110646164 A CN110646164 A CN 110646164A CN 201910995863 A CN201910995863 A CN 201910995863A CN 110646164 A CN110646164 A CN 110646164A
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- inner cylinder
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- shield tunnel
- tunnel segment
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
Abstract
The invention discloses an experimental device for simulating a floating process of a shield tunnel segment, which comprises an inner cylinder for simulating the tunnel segment, an outer cylinder forming an annular gap with the inner cylinder, two side baffles for fixing and sealing the outer cylinder, a displacement sensor for measuring floating displacement of the inner cylinder and a cross beam, wherein the inner cylinder is fixed on the outer cylinder; the beam passes through the two baffles and the inner cylinder, and the positions of two ends of the beam are fixed; the two ends of the inner cylinder are tightly attached to the baffles on the two sides through sealing rings, the cross beam is connected with the inner cylinder through an adjusting device, the displacement sensor is connected with the inner cylinder, a grouting device is installed on the side portion of each baffle, and the grouting device is communicated with the annular gap between the inner cylinder and the outer cylinder. 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.
Description
Technical Field
The invention belongs to the technical field of shield construction engineering, and particularly relates to an experimental device for simulating a floating process 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.
Disclosure of Invention
Based on the problems in the prior art, the invention aims to provide an experimental device for simulating the floating process of a shield tunnel segment.
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 process of a shield tunnel segment, which comprises an inner cylinder for simulating the tunnel segment, an outer cylinder forming an annular gap with the inner cylinder, two side baffles for fixing and sealing the outer cylinder, a displacement sensor for measuring the floating displacement of the inner cylinder and a cross beam, wherein the inner cylinder is fixed on the outer cylinder; the beam passes through the two baffles and the inner cylinder, and the positions of two ends of the beam are fixed; the two ends of the inner cylinder are tightly attached to the baffles on the two sides through sealing rings, the cross beam is connected with the inner cylinder through an adjusting device, the displacement sensor is connected with the inner cylinder, a grouting device is installed on the side portion of each baffle, and the grouting device is communicated with the annular gap between the inner cylinder and the outer cylinder.
Preferably, the adjusting devices are symmetrically arranged on two sides of the center of the inner barrel and comprise adjusting screw rods, adjusting nuts and fixed end nuts, the fixed end nuts are embedded in the inner wall of the inner barrel, the tops of the adjusting screw rods are connected with the fixed end nuts, and the lower portions of the adjusting screw rods penetrate through the cross beam and are fixed through the adjusting nuts.
Preferably, the slip casting device include slip casting pipe, flow control valve and funnel, the slip casting pipe lower extreme pass the baffle and communicate with annular gap, the funnel is installed in the slip casting pipe upper end, flow control valve installs on the slip casting pipe.
Preferably, the four corners of the baffle are respectively provided with a hole, the connecting rod penetrates through the holes to connect the baffle with the two sides of the outer barrel, and the two ends of the connecting rod are fixed through connecting nuts. The connecting rods penetrate through the four holes respectively, the baffle and the two ends of the outer barrel are fixedly sealed, the structure is stable, a small amount of vaseline is smeared on the contact surfaces of the two baffles and the outer barrel, the baffles are made of polytetrafluoroethylene thin plates, the surface friction coefficient is extremely low, and the friction force between the inner barrel and the baffles on the two sides in the floating process can be reduced.
Preferably, the baffle is provided with a round hole, the aperture of the round hole is smaller than the cylinder diameter of the inner cylinder, and the cross beam passes through the center of the round hole. The round hole makes things convenient for the installation of crossbeam, and provides the facility of operation for the experimentation.
Preferably, both ends of the inner cylinder and both ends of the outer cylinder are both in an open structure, and the outer cylinder is provided with an air outlet. The air outlet hole 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 cylinder is wrapped with a metal mesh, cement paste is smeared on the outer surface of the metal mesh, and the surface condition of the reinforced concrete segment can be simulated. The processing mode comprises the steps of polishing the outer surface of the inner cylinder to be rough, and then coating cement paste, or coating materials such as metal nets, cloth and the like, and then coating the cement paste.
Preferably, a first annular positioning block and a second annular positioning block are arranged on the inner side of the baffle; the lower end of the inner cylinder is positioned on the first annular positioning block, and the lower end of the outer cylinder is positioned on the second annular positioning block. The first annular positioning block and the second annular positioning block are used for determining the installation positions of the inner cylinder and the outer cylinder.
Preferably, the crossbeam on be equipped with two U type draw-in grooves, adjusting screw blocks in the U type draw-in groove.
Preferably, the contact surface of the sealing ring and the baffle is a smooth surface. The sealing ring is a U-shaped rubber sealing ring or a U-shaped sponge sealing ring, can be tightly attached to the baffle plates, prevents slurry from leaking into the inner barrel, and can reduce the friction force between the inner barrel and the baffle plates on the two sides in the floating process by spraying vaseline on the surface of the sealing ring.
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.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is a schematic structural view of a cross-beam according to the present invention;
FIG. 4 is a schematic view of the construction of the baffle of 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 cross beam; 7-sealing ring; 8-grouting devices; 9-a connecting rod; 10-a connecting nut; 11-a first annular locating block; 12-a second annular locating block; 21-air outlet holes; 31-holes; 32-round holes; 51-adjusting screw; 52-an adjusting nut; 53-end-fixing nuts; a 61-U-shaped clamping groove; 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.
As shown in fig. 1 and fig. 2, the present embodiment relates to an experimental device for simulating a floating process of a shield tunnel segment, which includes an inner cylinder 1 for simulating a tunnel segment, an outer cylinder 2 forming an annular gap with the inner cylinder 1, two side baffles 3 for fixing and sealing the outer cylinder 2, a displacement sensor 4 for measuring floating displacement of the inner cylinder 1, and a cross beam 6; the cross beam 6 penetrates through the two baffles 3 and the inner cylinder 1, and the positions of two ends of the cross beam 6 are fixed; the two ends of the inner cylinder 1 are tightly attached to the baffle plates 3 on the two sides through the sealing rings 7, the cross beam 6 is connected with the inner cylinder 1 through the adjusting device 5, the displacement sensor 4 is connected with the inner cylinder 1 through the magnetic gauge stand, the grouting device 8 is installed on the lateral part of the baffle plate 3, and the grouting device 8 is communicated with the annular gap between the inner cylinder and the outer cylinder.
As shown in fig. 1 and 3, the adjusting devices 5 are symmetrically arranged at the left side and the right side of the center of the inner cylinder 1, each adjusting device 5 comprises an adjusting screw 51, an adjusting nut 52 and a fixed end nut 53, the fixed end nut 53 is embedded in the inner wall of the inner cylinder 1, the top of each adjusting screw 51 is connected with the fixed end nut 53, two U-shaped clamping grooves 61 are arranged on the cross beam 6, the lower parts of the adjusting screws 51 are clamped in the U-shaped clamping grooves 61, and the adjusting nuts 52 are screwed into the adjusting screws 51 below the cross beam 6.
As shown in fig. 1, the grouting device 8 includes a grouting pipe 81, a flow control valve 82 and a funnel 83, the lower end of the grouting pipe 81 passes through the baffle 3 to communicate with the annular gap, the funnel 83 is installed at the upper end of the grouting pipe 81, and the flow control valve 82 is installed on the grouting pipe 81 for controlling grouting.
As shown in fig. 2 and 4, holes 31 are respectively formed at four corners of the baffle 3, the connecting rod 9 passes through the 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. Pass connecting rod 9 respectively in four holes 31, with the both ends fixed seal of baffle 3 and urceolus 2, the structure is firm, paints a small amount of vaseline in the contact surface department of two baffles 3 and urceolus 2, baffle 3 adopts the polytetrafluoroethylene sheet metal, and coefficient of surface friction is minimum, can reduce inner tube 1 come-up in-process and the frictional force of both sides baffle 3.
The baffle 3 is provided with a round hole 32, the aperture of the round hole 32 is smaller than the diameter of the inner cylinder 1, when the inner cylinder 1 floats upwards, the inner cylinder 1 is always positioned at the periphery of the round hole 32, and the cross beam 6 penetrates through the center of the round hole 32. The round hole 32 facilitates the installation of the cross beam 6 and provides convenience for the operation of the experimental process.
As shown in fig. 1, both ends of the inner cylinder 1 and both ends of the outer cylinder 2 are open, and the outer cylinder 2 is provided with an air outlet 21. The air outlet 21 of the outer cylinder 2 is used for discharging air in the outer cylinder 2 when injecting slurry into the outer cylinder 2. The outer surface of the inner cylinder 1 is wrapped with a metal mesh, cement paste is smeared on the outer surface of the metal mesh, and the surface condition of the reinforced concrete segment can be simulated. The processing mode comprises the steps of polishing the outer surface of the inner barrel 1 to be rough, and then coating cement paste, or coating materials such as metal meshes and cloth and then coating the cement paste.
As shown in fig. 1 and 2, a first annular positioning block 11 and a second annular positioning block 12 are arranged inside the baffle 3; the lower end of the inner cylinder 1 is positioned on a first annular positioning block 11, and the lower end of the outer cylinder 2 is positioned on a second annular positioning block 12. The first annular positioning block 11 and the second annular positioning block 12 are used for determining the installation positions of the inner cylinder 1 and the outer cylinder 2.
The contact surface of the sealing ring 7 and the baffle 3 is a smooth surface. The sealing ring 7 is a U-shaped rubber sealing ring or a U-shaped sponge sealing ring, can be tightly attached to the baffle 3, prevents slurry from leaking into the inner barrel, and can reduce the friction force between the inner barrel 1 and the baffle 3 on the two sides in the floating process by spraying and gathering vaseline on the surface of the sealing ring 7.
The specific installation process of the invention is as follows:
the method comprises the following steps: the inner wall of the inner cylinder 1 is embedded with a fixed end nut 53, the two ends of the inner cylinder 1 are sleeved with the sealing rings 7, at the moment, gaps are reserved between the sealing rings 7 and the two end faces of the inner cylinder 1, and the distance between the two end faces of the sealing rings 7 is slightly larger than the length of the outer cylinder 1. The upper end of the adjusting screw 51 is screwed into the fixed end nut 53, the lower end is screwed into the adjusting nut 52, the displacement sensor 4 is arranged in the inner cylinder 1, the displacement sensor 4 and the adjusting device 5 are positioned in the same plane, and the inner cylinder 1 is arranged in the outer cylinder 2.
Step two: baffle 3 is placed in the outside of inner tube 1, urceolus 2, and inner tube 3 is placed on first annular locating piece 11, and urceolus 2 is placed on second annular locating piece 12, and rotatory urceolus 2 guarantees that venthole 21 is located directly over. The connecting rod 9 penetrates through the holes 31 at the four corners of the two side baffles 3, the connecting nut 10 is screwed to tightly press and seal the two side baffles 3 and the outer cylinder 2, meanwhile, the sealing ring 7 slides along the inner cylinder 1, and the two side baffles 3 are tightly attached to the sealing ring 7.
Step three: the beam 6 is inserted into the inner cylinder 1 through the round hole 32, and the two adjusting screws 51 are clamped into the U-shaped groove 61. And adjusting a magnetic gauge stand (not shown in the figure) to enable the displacement sensor 4 to be in contact with the inner wall of the inner barrel 1, and fixing the two sides of the cross beam 6 after the adjustment is finished so as to ensure that the cross beam 6 does not move. The adjusting nut 52 is rotated to contact with the lower surface of the cross beam 6, the debugging displacement sensor 4 is connected to a data acquisition instrument (not shown in the figure), and the grouting pipe 81 is installed.
The invention adopts the following 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 cylinder 1 and the outer cylinder 2 through the grouting pipe 81, air in the outer cylinder 2 is discharged from the air outlet 22, and the regulating valve 82 is closed until the whole annular gap is filled with the slurry.
Step two: the inner cylinder 1 is fixed under the restriction of the adjusting nuts 52 and the cross beam 6, after the device is stabilized, the two adjusting nuts 52 are unscrewed, the inner cylinder 1 floats upwards under the action of buoyancy, and the displacement sensor 4 measures and records the development process of the floating displacement. And (4) after the experiment is finished, detaching the baffle 3, taking out the inner barrel 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 (10)
1. An experimental device for simulating the floating process of a shield tunnel segment is characterized by comprising an inner cylinder for simulating the tunnel segment, an outer cylinder forming an annular gap with the inner cylinder, two side baffles for fixing and sealing the outer cylinder, a displacement sensor for measuring floating displacement of the inner cylinder and a cross beam; the beam passes through the two baffles and the inner cylinder, and the positions of two ends of the beam are fixed; the two ends of the inner cylinder are tightly attached to the baffles on the two sides through sealing rings, the cross beam is connected with the inner cylinder through an adjusting device, the displacement sensor is connected with the inner cylinder, a grouting device is installed on the side portion of each baffle, and the grouting device is communicated with the annular gap between the inner cylinder and the outer cylinder.
2. The experimental device for simulating the floating process 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 inner cylinder, each adjusting device comprises an adjusting screw rod, an adjusting nut and a fixed end nut, the fixed end nuts are embedded in the inner wall of the inner cylinder, the top of each adjusting screw rod is connected with the fixed end nuts, and the lower portions of the adjusting screw rods penetrate through the cross beams and are fixed through the adjusting nuts.
3. The experimental device for simulating the floating process 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 annular gap, the funnel is installed at the upper end of the grouting pipe, and the flow regulating valve is installed on the grouting pipe.
4. The experimental device for simulating the floating process of the shield tunnel segment as claimed in claim 1, wherein holes are respectively formed at four corners of the baffle, the connecting rod passes through the holes to connect the baffle with two sides of the outer cylinder, and two ends of the connecting rod are fixed through connecting nuts.
5. The experimental device for simulating the floating process of the shield tunnel segment as claimed in claim 1, wherein the baffle is provided with a circular hole, and the aperture of the circular hole is smaller than the diameter of the inner cylinder.
6. The experimental device for simulating the floating process of the shield tunnel segment according to claim 1, wherein both ends of the inner cylinder and both ends of the outer cylinder are open structures, and the outer cylinder is provided with air outlets.
7. The experimental device for simulating the floating process of the shield tunnel segment as claimed in claim 1, wherein the outer surface of the inner cylinder is wrapped with a metal mesh, and cement slurry is coated on the outer surface of the metal mesh.
8. The experimental device for simulating the floating process of the shield tunnel segment according to claim 1, wherein a first annular positioning block and a second annular positioning block are arranged on the inner side of the baffle; the lower end of the inner cylinder is positioned on the first annular positioning block, and the lower end of the outer cylinder is positioned on the second annular positioning block.
9. The experimental device for simulating the floating process of the shield tunnel segment according to claim 2, wherein the beam is provided with two U-shaped clamping grooves, and the adjusting screw is clamped in the U-shaped clamping grooves.
10. The experimental device for simulating the floating process of the shield tunnel segment according to claim 1, wherein the contact surface of the sealing ring and the baffle is a smooth surface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910995863.XA CN110646164B (en) | 2019-10-18 | 2019-10-18 | Experimental device for simulation shield tunnel section of jurisdiction come-up process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910995863.XA CN110646164B (en) | 2019-10-18 | 2019-10-18 | Experimental device for simulation shield tunnel section of jurisdiction come-up process |
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| CN110646164B CN110646164B (en) | 2021-09-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111272980A (en) * | 2020-02-29 | 2020-06-12 | 西南石油大学 | Simulation system and experimental method for regulating shield floating of mudstone stratum |
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| CN111272980B (en) * | 2020-02-29 | 2024-04-19 | 西南石油大学 | Simulation system and experimental method for regulating shield floating of mudstone stratum |
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| CN110646164B (en) | 2021-09-14 |
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