CN210118126U - Emergency tool changing structure for high-water-pressure shield tunnel in sea area - Google Patents
Emergency tool changing structure for high-water-pressure shield tunnel in sea area Download PDFInfo
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- CN210118126U CN210118126U CN201920919978.6U CN201920919978U CN210118126U CN 210118126 U CN210118126 U CN 210118126U CN 201920919978 U CN201920919978 U CN 201920919978U CN 210118126 U CN210118126 U CN 210118126U
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Abstract
The utility model discloses an emergency tool changing structure for a sea area high water pressure shield tunnel, which comprises a shield machine and is characterized by also comprising a freezing operation platform, a soil body freezing curtain and a shield body protection structure; a shield machine is arranged below the freezing operation platform, and the freezing operation platform and the shield machine are connected through a soil freezing curtain; the soil body freezing curtain consists of a front end vertical freezing structure and a lower vertical freezing structure; a cutter head is arranged at one end of the shield tunneling machine facing the soil body freezing curtain, a shield body protection structure is arranged on the side surface of one end close to the cutter head, and a secondary grouting protection structure, a segment plugging protection structure and a shield tail protection structure are arranged on the side surface of the other end; the shield machine is provided with a plurality of shield segments. The utility model discloses realize that submarine shield tunnel emergent tool changing and restoration blade disc etc. under the risk accident appears, and structural style is simple, and is little to the sea influence.
Description
Technical Field
The utility model belongs to the technical field of tunnel and underground works design and construction, especially, relate to one kind at sea area and when the shield tunnel construction under the high water pressure condition under water, emergent repair structure and the corresponding implementation method of adopting under the unusual state, guarantee shield constructs quick-witted safe tunnelling of getting rid of poverty.
Background
Undersea or underwater tunnels are increasingly used as a channel mode with little influence on the environment and strong disaster prevention capability. The shield method is a common form for building the underwater tunnel, and compared with a mine method, the shield method is high in mechanization degree and high in construction speed.
The construction risk of the tunnel penetrating through the water area in a long distance is large, and particularly the shield tunnel under the conditions of high water pressure and long-distance tunneling. As the general geological conditions of the submarine tunnel are complex, hard rock stratums and soft soil layers can exist, the abrasion of the shield cutter is inevitable. When the tunneling distance of the shield tunneling machine is long, the rock breaking capacity and the continuous tunneling capacity of the shield tunneling machine are ensured by adopting a mode of replacing a cutter. Several tool changing methods commonly used at present include the following:
1) open cabin normal pressure tool changing technology-hard rock or stratum with good self-stability and water-resisting property after reinforcement.
2) The pressurized cabin-entering tool changing technology, which is used for various weak stratums, has limited single operation time and lower work efficiency.
3) Saturated gas pressurized cabin-entering tool changing technology-various weak stratums, and continuous operation.
4) The cutter changing technology under normal pressure based on the cutter changing device can change 35 to 40 percent of cutters.
The tool changing method and the tool changing technology are mainly applied to the normal tunneling stage of the shield, the tunnel face has certain stability, and the balance of the soil bin or the muddy water bin of the shield tunneling machine can be established. However, for a long-distance submarine tunnel, the shield tunneling is inevitably likely to encounter an abnormal state such as unstable or collapsed tunnel face, abrasion of a cutter head, and the shield tunneling machine is trapped, which requires replacement and repair of the cutter head of a cutter in an emergency state, so that the shield tunneling machine can be released from the emergency state.
At present, the research on cutter replacement in engineering mainly focuses on a cutter replacing method under normal tunneling, and the research on an emergency cutter replacing technology under the special risk accident of an underwater tunnel has no relevant report. For tunnels constructed by adopting a shield method on land, when a risk accident occurs and tool changing is needed, generally, after ground reinforcement, a vertical shaft is excavated to a shield cutter head, and tool changing and cutter head repair are carried out. The method is not feasible for the submarine tunnel, the shield machine is positioned in the sea, and a conditional excavation vertical shaft cannot be provided on the sea surface.
Therefore, in combination with shield machinery and structural processing, in order to ensure that the construction risk of the submarine shield tunnel is controllable, improve the construction efficiency and reduce the construction risk, the sea area high-water pressure shield emergency tool changing structure and the construction method are provided, wherein the combination of freezing in the sea surface tunnel and digging in the tunnel into a small chamber are adopted, so that the shield machine can be safely and easily taken out of the sea area when a risk accident occurs, and a larger safety accident cannot be caused.
SUMMERY OF THE UTILITY MODEL
The utility model discloses above-mentioned traditional shield method tunnel emergency treatment who exists adopts the technical problem that the submarine tunnel can not be applied to the ground shaft mode among the prior art, the emergency tool changing structure of submarine high water pressure shield method tunnel is provided, realize that submarine shield tunnel appears emergent tool changing under the risk accident and restores the blade disc etc. ensure that the shield constructs the machine and can get rid of poverty and tunnel once more safely, avoid taking place catastrophic accident, and structural style and worker method simple process, the structure atress is reasonable, construction convenient and fast's characteristics, and work such as tool changing and blade disc restoration all goes on in the hole, the construction risk is low, it is little to the sea influence.
In order to solve the technical problem, the utility model discloses a technical scheme is: an emergency tool changing structure of a sea area high water pressure shield tunnel comprises a shield machine (12), a freezing operation platform (1), a soil body freezing curtain (4) and a shield body protecting structure (5);
a shield machine (12) is arranged below the freezing operation platform (1), and the freezing operation platform (1) and the shield machine (12) are connected through a soil freezing curtain (4); the soil freezing curtain (4) consists of a front vertical freezing structure (2) and a lower vertical freezing structure (3);
a cutter head (11) is arranged at one end, facing the soil body freezing curtain (4), of the shield machine (12), a shield body protection structure (5) is arranged on the side surface of one end, close to the cutter head (11), of the shield machine, and a secondary grouting protection structure (8), a segment plugging protection structure (7) and a shield tail protection structure (6) are arranged on the side surface of the other end of the shield machine; the shield machine (12) is provided with a plurality of shield segments (9).
Preferably, the freezing operation platform (1) is positioned on the sea surface above the shield machine stopping position, is used for implementing a platform of a front-end vertical freezing structure, is used for placing a freezing unit and the like, and is formed by splicing fixed ship bodies or is formed by constructing a steel structure and a steel pipe pile foundation.
Preferably, the shield body protection structure (5) adopts shield mud, and the shield mud is injected through radial holes of the shield machine to protect the periphery of the shield machine shell and prevent the shield body from being solidified in the reinforcing process.
Preferably, the shield tail protection structure (6) adopts slurry, the slurry is injected into the tail part of the shield body, and the grouting pipeline and the shield tail are sealed to be wrapped and protected.
Preferably, the duct piece plugging protection structure (7) adopts polyurethane as a hoop, and two rings close to the tail ring of the shield adopt polyurethane as hoops to block a groundwater seepage channel.
Preferably, the secondary grouting protection structure (8) adopts grouting, and secondary grouting is performed on the adjacent 50 ring pipe pieces by using the hoisting holes to plug water from the rear.
Preferably, the front-end vertical freezing structure (2) is a front-end vertical freezing structure drilled by a freezing operation platform, and the front-end vertical freezing structure is drilled to a designed depth to freeze and reinforce the soil around the shield cutter head (11); the freezing and reinforcing range is 3-4 m in front of the cutter head, 2-3 m behind the cutter head (11), 5-8 m above the cutter head (11) and 3-5 m below the cutter head (11).
Preferably, the lower vertical freezing structure is used for freezing and reinforcing soil mass in a blind area below the head part of the shield machine in the shield machine, horizontal advanced freezing hole construction is carried out by utilizing advanced holes at the lower part of the shield machine, 8 advanced holes are arranged in the annular direction, the freezing unit is arranged on a structural bottom plate, and pipelines are arranged in a tunnel.
Preferably, the soil body freezing curtain (4) ensures the water stopping and reinforcing effects of the soil body. The freezing parameters are determined according to seawater and stratum tests, the temperature of the frozen brine is generally not higher than-28 ℃, and the freezing time runs through the whole processes of repair of the tool box and replacement of the tool.
The restoration tunnel (10) is a small-sized chamber excavated in front of a cutter head (11) in a soil body freezing curtain (4), and a vertical wall is connected with an arch structure and supported by steel plates and heat-insulating materials. The repairing tunnel is formed by entering a muddy water bin by personnel after freezing and reinforcing, entering an excavation surface from a cutter head (11), excavating and supporting in time. The size of the repair tunnel is 1.9m in height, 1.8m in width and 0.7m in depth.
The front end vertical freezing structure (2) and the lower vertical freezing structure (3) need to be removed after repair is completed before the shield is restored to tunnel, the lower vertical freezing structure pipes are all removed, the front end vertical freezing structure pipes are removed to 1m outside the range of shield excavation, the shield begins to be deplaced and tunneled, and the rest front end vertical freezing structure pipes are removed after the shield completely passes through the front end vertical freezing structure.
Compared with the prior art, the utility model discloses the beneficial effect who has is:
1. the utility model can realize emergency tool changing and cutter head repairing under the occurrence of risk accidents in the submarine shield tunnel, ensure that the shield machine can safely escape from trouble and tunnel again, and avoid catastrophic accidents;
2. the tool changing and repairing process of the utility model is carried out under normal pressure without considering the problem of high water pressure;
3. the utility model discloses worker method simple process, convenient operation utilize shield structure machine protection and multichannel to freeze the structure, and the construction risk is little, and water-proof effects is good, and safe and reliable is restoreed to the tool changing.
Drawings
FIG. 1 is a schematic view of the longitudinal arrangement of the structure of the present invention;
FIG. 2 is a front cross-sectional view of the cutter head of the present invention;
fig. 3 is a schematic cross-sectional view of the cutter head of the present invention.
In the figure, 1-a freezing operation platform, 2-a front end vertical freezing structure, 3-a lower vertical freezing structure, 4-a soil body freezing curtain, 5-a shield body protection structure, 6-a shield tail protection structure, 7-a segment plugging protection structure, 8-a secondary grouting protection structure, 9-a shield segment, 10-a repair tunnel, 11-a cutter head and 12-a shield machine.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The embodiment of the utility model discloses an emergency tool changing structure of a sea area high water pressure shield tunnel, which comprises a shield machine 12, a freezing operation platform 1, a soil body freezing curtain 4 and a shield body protection structure 5;
a shield machine 12 is arranged below the freezing operation platform 1, and the freezing operation platform 1 and the shield machine 12 are connected through a soil freezing curtain 4; the soil freezing curtain 4 consists of a front vertical freezing structure 2 and a lower vertical freezing structure 3;
a cutter head 11 is arranged at one end of the shield machine 12 facing the soil freezing curtain 4, a shield body protection structure 5 is arranged on the side surface of one end close to the cutter head 11, and a secondary grouting protection structure 8, a segment plugging protection structure 7 and a shield tail protection structure 6 are arranged on the side surface of the other end; the shield machine 12 is provided with a plurality of shield segments 9.
In this embodiment, the freezing operation platform 1 is located on the sea surface above the stop position of the shield machine, is used for implementing a platform with a front end vertical freezing structure, placing a freezing unit and the like, and is formed by splicing fixed ship bodies or by constructing a steel structure and a steel pipe pile foundation.
In this embodiment, the shield protection structure 5 adopts shield mud, and shield mud is injected through the radial hole of the shield machine to protect the periphery of the shield machine shell and prevent the shield body from being solidified in the reinforcing process.
In this embodiment, the shield tail protection structure 6 adopts slurry, and slurry is injected into the tail of the shield body to wrap the grouting pipeline and the shield tail seal.
In this embodiment, the duct piece plugging protection structure 7 is made of polyurethane, and two rings near the tail ring of the shield are made of polyurethane to block the groundwater seepage passage.
In this embodiment, secondary slip casting protection architecture 8 adopts the slip casting, for carrying out the secondary slip casting to utilizing the hole for hoist near 50 ring pipe pieces, shutoff rear water.
In this embodiment, the front end vertical freezing structure 2 is a front end vertical freezing structure drilled by the freezing operation platform 1 and drilled to a designed depth to freeze and reinforce the soil around the shield cutter head 11. The diameter of the shield machine is about 7m, the distance between freezing holes is 800mm multiplied by 800mm, and the freezing reinforcement ranges are 3.5m in front of a cutter head, 2m behind the cutter head, 5m above the cutter head and 3m below the cutter head.
In the embodiment, the lower vertical freezing structure is used for freezing and reinforcing soil bodies in a blind area below the head of the shield machine in the shield machine, horizontal advanced freezing hole construction is carried out by utilizing advanced holes in the lower portion of the shield machine, 8 advanced holes are arranged in the circumferential direction, the freezing unit is arranged on a structural bottom plate, and pipelines are arranged in a tunnel.
In the embodiment, the soil freezing curtain 4 ensures the water stopping and reinforcing effects of the soil. The freezing parameters are determined according to seawater and stratum tests, the temperature of the frozen brine is generally not higher than-28 ℃, and the freezing time runs through the whole processes of repair of the tool box and replacement of the tool.
The repair tunnel 10 is a small-sized chamber excavated in front of a cutter head 11 in the soil freezing curtain 4, and a vertical wall is connected with an arch structure and is supported by steel plates and heat-insulating materials. After being frozen and reinforced, the repaired tunnel enters a muddy water bin by personnel, enters an excavation surface from the cutter head 11, is excavated and is supported in time. The size of the repair tunnel is 1.9m in height, 1.8m in width and 0.7m in depth.
The front end vertical freezing structure 2 and the lower vertical freezing structure 3 need to be removed before the shield is restored to be tunneled after restoration is completed, all the lower vertical freezing structure pipes are removed, the front end vertical freezing structure pipes are removed to 1m outside the shield excavation range, shield escaping tunneling is started, and the remaining front end vertical freezing structure pipes are removed after the shield completely passes through the front end vertical freezing structure.
The method comprises the steps of firstly protecting a shield machine to ensure the safety of a shield tail, a shield body and pipe pieces of the shield machine, then implementing a front-end vertical freezing structure and a lower vertical freezing structure through a freezing operation platform, finally excavating a repair tunnel in a freezing range, and realizing shield emergency tool changing and cutter repairing in an abnormal state in the repair tunnel through a rotary cutter.
The present invention has been described in detail with reference to the embodiments, but the description is only exemplary of the present invention and should not be construed as limiting the scope of the present invention. The protection scope of the present invention is defined by the claims. Technical scheme, or technical personnel in the field are in the utility model technical scheme's inspiration the utility model discloses an essence and protection within range, design similar technical scheme and reach above-mentioned technological effect, perhaps to the impartial change that application scope was made and improve etc. all should still belong to within the protection scope is covered to the patent of the utility model. It should be noted that for the sake of clarity, parts of the description of the invention have been omitted which do not have a direct obvious relationship with the scope of protection of the invention, but which are known to the skilled person.
Claims (6)
1. An emergency tool changing structure of a sea area high water pressure shield tunnel comprises a shield machine (12), and is characterized by further comprising a freezing operation platform (1), a soil body freezing curtain (4) and a shield body protection structure (5);
a shield machine (12) is arranged below the freezing operation platform (1), and the freezing operation platform (1) and the shield machine (12) are connected through a soil freezing curtain (4); the soil freezing curtain (4) consists of a front vertical freezing structure (2) and a lower vertical freezing structure (3);
a cutter head (11) is arranged at one end, facing the soil body freezing curtain (4), of the shield machine (12), a shield body protection structure (5) is arranged on the side surface of one end, close to the cutter head (11), of the shield machine, and a secondary grouting protection structure (8), a segment plugging protection structure (7) and a shield tail protection structure (6) are arranged on the side surface of the other end of the shield machine; the shield machine (12) is provided with a plurality of shield segments (9).
2. The emergency tool changing structure for the shield tunnel with the high water pressure in the sea area according to claim 1, wherein the freezing operation platform (1) is positioned on the sea surface above the stop position of the shield machine and is formed by splicing fixed ship bodies or by constructing a steel structure and a steel pipe pile foundation.
3. The emergency tool changing structure for the shield tunnel in the sea area high water pressure shield method according to claim 1, wherein the shield body protecting structure (5) adopts shield mud.
4. The emergency tool changing structure for the shield tunnel in the sea area high water pressure shield method according to claim 1, wherein the shield tail protection structure (6) adopts slurry.
5. The emergency tool changing structure for the sea area high water pressure shield tunnel according to claim 1, wherein the segment blocking protection structure (7) is made of polyurethane as a hoop.
6. The emergency tool changing structure for the sea area high water pressure shield tunnel according to claim 1, wherein the secondary grouting protection structure (8) adopts grouting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920919978.6U CN210118126U (en) | 2019-06-19 | 2019-06-19 | Emergency tool changing structure for high-water-pressure shield tunnel in sea area |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920919978.6U CN210118126U (en) | 2019-06-19 | 2019-06-19 | Emergency tool changing structure for high-water-pressure shield tunnel in sea area |
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| CN210118126U true CN210118126U (en) | 2020-02-28 |
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| CN201920919978.6U Active CN210118126U (en) | 2019-06-19 | 2019-06-19 | Emergency tool changing structure for high-water-pressure shield tunnel in sea area |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110159274A (en) * | 2019-06-19 | 2019-08-23 | 中铁第六勘察设计院集团有限公司 | A kind of high hydraulic pressure shield tunnel emergency tool-changing mechanism in sea area and construction method |
| CN112576267A (en) * | 2021-02-22 | 2021-03-30 | 中铁九局集团第四工程有限公司 | Efficient normal-pressure tool changing construction method for water-rich sandy gravel stratum |
-
2019
- 2019-06-19 CN CN201920919978.6U patent/CN210118126U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110159274A (en) * | 2019-06-19 | 2019-08-23 | 中铁第六勘察设计院集团有限公司 | A kind of high hydraulic pressure shield tunnel emergency tool-changing mechanism in sea area and construction method |
| CN110159274B (en) * | 2019-06-19 | 2024-03-01 | 中铁第六勘察设计院集团有限公司 | Sea area high water pressure shield method tunnel emergency tool changing structure and construction method |
| CN112576267A (en) * | 2021-02-22 | 2021-03-30 | 中铁九局集团第四工程有限公司 | Efficient normal-pressure tool changing construction method for water-rich sandy gravel stratum |
| CN112576267B (en) * | 2021-02-22 | 2021-12-21 | 中铁九局集团第四工程有限公司 | Efficient normal-pressure tool changing construction method for water-rich sandy gravel stratum |
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