CN118030113A - Local repair method for accident tunnel - Google Patents
Local repair method for accident tunnel Download PDFInfo
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- CN118030113A CN118030113A CN202410316402.6A CN202410316402A CN118030113A CN 118030113 A CN118030113 A CN 118030113A CN 202410316402 A CN202410316402 A CN 202410316402A CN 118030113 A CN118030113 A CN 118030113A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000008439 repair process Effects 0.000 title claims abstract description 19
- 238000010276 construction Methods 0.000 claims abstract description 31
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 17
- 238000004140 cleaning Methods 0.000 claims abstract description 5
- 238000007710 freezing Methods 0.000 claims description 42
- 230000008014 freezing Effects 0.000 claims description 42
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 230000000903 blocking effect Effects 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 5
- 239000004567 concrete Substances 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 2
- 238000009412 basement excavation Methods 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 9
- 238000005553 drilling Methods 0.000 description 12
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- 239000000243 solution Substances 0.000 description 2
- 239000012267 brine Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 230000002349 favourable effect Effects 0.000 description 1
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- 238000001764 infiltration Methods 0.000 description 1
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- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The application belongs to the technical field of tunnel construction, and particularly discloses a local repair method of an accident tunnel, which comprises the following steps: s1: shi Zuogong working well, setting a reinforcing structure for reinforcing the periphery of the tunnel intact section from the working well towards the tunnel intact section; s2: a hole and a safety door are arranged on a working well, so that the safety door can open and close the hole; s3: excavating along the hole towards the tunnel intact section, and setting a primary support along with the excavation section; s4: a second lining is applied on the inner side of the primary support, and the second lining is connected with a shield segment of the tunnel intact section; s5: and (3) dismantling the safety door, and applying a ring beam at the hole to enable the ring beam to be connected with the main body structure and the second lining of the working well, and then cleaning the tunnel intact section to enable the working well to be communicated with the tunnel intact section. According to the application, the construction risk in the tunnel repairing construction process can be reduced, and the working well is arranged to be effectively connected with the intact section of the tunnel, so that the local repairing of the accident tunnel is realized.
Description
Technical Field
The application belongs to the technical field of tunnel construction, and particularly relates to a local repair method of an accident tunnel.
Background
The shield tunnel is an underground tunnel constructed by a shield machine. The shield tunnel construction technology is widely applied to modern city construction, and provides important support for city traffic and infrastructure construction.
Along with the development of tunnel engineering in a large area, the risk of water stopping failure caused by the reasons of shield equipment problems or improper operation and the like exists, and particularly when the fine sand stratum is constructed, the pressurized water is wrapped by the soil body to flow into the tunnel to cause ground collapse and segment damage.
Disclosure of Invention
Aiming at the defects of the prior art, the application provides a local repair method of an accident tunnel, which aims to locally repair the accident tunnel and reduce the construction risk in the tunnel repair construction process.
In order to achieve the above purpose, the local repair method of the accident tunnel provided by the application comprises the following steps:
S1: shi Zuogong working well, setting a reinforcing structure for reinforcing the periphery of the tunnel intact section from the working well towards the tunnel intact section;
s2: a hole and a safety door are arranged on a working well, so that the safety door can open and close the hole;
S3: excavating along the hole towards the tunnel intact section, and setting a primary support along with the excavation section;
S4: a second lining is applied on the inner side of the primary support, and the second lining is connected with a shield segment of the tunnel intact section;
S5: and (3) dismantling the safety door, and applying a ring beam at the hole to enable the ring beam to be connected with the main body structure and the second lining of the working well, and then cleaning the tunnel intact section to enable the working well to be communicated with the tunnel intact section.
Compared with the prior art, through the technical scheme, shi Zuogong is used for reinforcing the tunnel through the applied reinforcing structure after the well is formed, so that the stress of the tunnel duct piece in the construction process is smaller, the construction risk is reduced, and the subsequent excavation work is facilitated; after the excavation work is finished, under the cooperation of the primary support and the secondary lining, the excavation section between the working well and the tunnel intact section can be effectively reinforced, construction safety is guaranteed, the secondary lining and the main body structure of the working well are connected into a whole through the ring beam, safe and reliable connection between the working well and the tunnel intact section can be realized, the working well is connected to the tunnel intact section as a permanent fixing structure, and local repair of the tunnel is realized.
As a further preferred option, in step S1, a blocking wall is provided in the intact section of the tunnel prior to the Shi Zuogong being run in the well.
By adopting the technical scheme, the blocking wall can support the tunnel, ensure the stability of the tunnel, and can separate the intact section of the tunnel from the damaged section of the tunnel so as to realize the partition of the repairing section and the intact section.
Further preferably, in step S1, before Shi Zuogong is performed, grouting filling is performed in the tunnel at the boundary between the intact section and the broken section of the tunnel.
By adopting the technical scheme, grouting filling can ensure that the disturbance of the construction work well on the shield segment is small, and the construction risk is reduced.
As a further preferred feature, the reinforcement structure in step S1 comprises a freeze pipe extending from the working well to the periphery of the tunnel-intact section, the freeze pipe being frozen to form a freeze wall, and then stopped after the ring beam construction is completed.
By adopting the technical scheme, the horizontal reinforcing area is formed by the freezing pipe, so that the area between the working well and the intact section of the tunnel can be subjected to water stopping and reinforcing, and the shield segment in the operation process can be ensured to be less in disturbance.
As a further preferable aspect, the freezing pipe is arranged in an inner-outer double ring shape.
Through adopting above-mentioned technical scheme, the mode that inside and outside dicyclo was laid can realize even cooling effect to can improve the stability and the compressive capacity of freezing the wall.
As a further preferable aspect, the freezing pipe includes an inner pipe and an outer pipe, and the mounting hole of the freezing pipe is drilled with a drill rod before the freezing pipe is constructed, and then the drill rod doubles as the outer pipe.
Through adopting above-mentioned technical scheme, freeze the mode that adopts inside and outside pipe circulation coolant liquid, can reduce the temperature of surrounding stratum fast until freezing, and the drilling rod is the outer tube of freezing pipe concurrently, not only can reduce construction cost, improve efficiency of construction, still be favorable to guaranteeing the stability of freezing pipe, promote the firm degree of freezing horizontal knot wall.
As a further preferred aspect, in step S1, the working well comprises an enclosure structure and a main body structure, wherein the enclosure structure comprises a diaphragm wall/concrete pile.
By adopting the technical scheme, compared with the traditional temporary working well for emergency rescue, after the working well and the intact section of the accident tunnel are connected, the working well can be used as a permanent structure and serve as a tunnel component structure, and the working well of the method is composed of a main body structure and a maintenance structure, has stronger structural strength and stability, so that the repairing process of the accident tunnel is safe and can save cost.
As a further preferred option, in step S3, the primary support comprises a circular steel arch provided in the excavated section, the circular steel arch being covered with a casting layer.
By adopting the technical scheme, the round steel arch and the pouring layer form a protective structure, and the excavation section between the working well and the tunnel intact section is reinforced.
Further preferably, in step S4, the second liner is bonded to the end face and the outer peripheral face of the shield segment.
By adopting the technical scheme, the two liners are combined with the shield segments in a concave-convex shape, so that the shield segments have a large combining surface, are uniformly stressed and are firmly connected.
As a further preferred aspect, in step S5, the hole is reamed before the ring beam is applied, so that the hole of the main body structure of the working well is larger than the outer contour of the second liner, and the hole of the maintenance structure of the working well is identical to the outer contour of the second liner.
Through adopting above-mentioned technical scheme, the hole that is located major structure department is greater than the hole of maintaining structure department, and when applying as the ring roof beam, the ring roof beam can be according to the shape of hole and the formation step form ring roof beam of adaptability, and its one end can combine with two liners, and outer peripheral face combines with the major structure of working well for the ring roof beam links two liners and the major structure of working well as an organic wholely.
In general, compared with the prior art, the above technical solution conceived by the present application mainly has the following technical advantages:
1. The tunnel is reinforced by the applied reinforcing structure, so that the stress of the tunnel duct piece in the construction process is small, the construction risk is reduced, and the subsequent excavation work is facilitated; after the excavation work is finished, under the cooperation of the primary support and the secondary lining, the excavation area between the working well and the tunnel intact section can be effectively reinforced, construction safety is guaranteed, the secondary lining and the main body structure of the working well are connected into a whole through the ring beam, safe and reliable connection between the working well and the tunnel intact section can be realized, and local repair of the tunnel is realized.
2. The working well can be used as a permanent structure and a tunnel composition structure, and has stronger structural strength and stability because the working well is composed of a main body structure and a maintenance structure, so that the repairing process of the accident tunnel is safe and the cost can be saved.
3. The hole at the main body structure is larger than the hole at the maintenance structure, when the ring beam is applied, the ring beam can form a step-shaped ring beam adaptively according to the shape of the hole, one end of the ring beam can be combined with the second lining, and the outer peripheral surface of the ring beam is combined with the main body structure of the working well, so that the ring beam connects the second lining and the main body structure of the working well into a whole.
Drawings
FIG. 1 is a schematic view of a construction position of a freezing pipe provided by an embodiment of the present application;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic view of construction positions of a safety door, a primary support and a blocking wall according to an embodiment of the present application;
FIG. 4 is a schematic view of the construction position of a secondary liner, primary support and freeze pipe provided by an embodiment of the present application;
FIG. 5 is a schematic view of a partial connection of a secondary liner and a shield segment according to an embodiment of the present application;
FIG. 6 is a schematic diagram of connection of a working well, a ring beam, a secondary liner and shield segments provided by an embodiment of the application;
FIG. 7 is a schematic view of a partial connection structure of a working well, a ring beam and a liner according to an embodiment of the present application.
The same reference numbers are used throughout the drawings to reference like elements or structures, wherein:
1. Ground surface; 2. shield segments; 3. a blocking wall; 4. cement mortar; 5. a building envelope; 6. a main body structure; 7. a freezing pipe; 8. a horizontal freeze wall; 9. a safety door; 10. primary support; 11. a second lining; 12. a water-swellable rubber; 13. grouting pipe; 14. and a ring beam.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The application is described in further detail below with reference to fig. 1-7.
The embodiment of the application discloses a local repair method for an accident tunnel. The local repair method of the accident tunnel comprises the following steps:
S1.1: after the deformation of the ground 1 above the tunnel is basically stable, judging the damage range of the accident tunnel by using a geological radar or a drilling detection method and the like, and determining the boundary between the damaged section and the intact section of the tunnel.
S1.2: and (3) drilling downwards from the ground 1 at the boundary position of the damaged section and the intact section of the tunnel, and injecting cement mortar 4 into the bottom and the interior of the tunnel along the drilling so as to realize grouting filling and effectively support the tunnel structure. Wherein the drilling arrangement is preferably rectangular in shape; the manner of drilling includes, but is not limited to, tubular drilling and drill pipe drilling.
S1.3: after grouting, the tunnel is accessed from the inside of the intact section of the tunnel and dredging is carried out, and a blocking wall 3 is arranged near the boundary line, wherein the blocking wall 3 comprises but is not limited to a steel-concrete blocking wall.
S1.4: shi Zuogong is used as a well, the working well comprises an enclosure structure 5 and a main body structure 6, the enclosure structure 5 can be a diaphragm wall, a concrete occluding pile and the like, the working well is an open-cut structure, the top elevation of a bottom plate of the working well is lower than the bottom elevation of a tunnel, and the working well is used for the construction of a subsequent reinforcing structure and has a construction space. The working well is preferably arranged in a preset shield route of the shield tunnel and can be used as a constituent part of the tunnel later to form a permanent structure.
S1.5: a reinforcing structure for reinforcing the outer circumference of the tunnel-like section is provided from the working well toward the tunnel-like section.
In some construction scenarios, the reinforcing structure comprises a freeze pipe 7; before the freezing pipe 7 is applied, the space and freezing parameters of the freezing pipe 7 are determined by adopting a freezing theory or finite element software for analysis, so that the horizontal freezing wall 8 formed later can bear the water and soil pressure.
Specifically, the freezing pipe 7 is preferably arranged in an inner-outer double ring shape; preferably, it is: the distance between the innermost freezing pipe 7 and the outer side of the tunnel is not more than 1.2m, and the distance between the outer wall of the freezing pipe 7 and the outer contour of the later excavation is not less than 20cm. During construction, drilling is carried out from a working well to the side of the perfect tunnel, and a 127mm drill rod is preferably selected, but the drilling is not limited to the 127mm drill rod; the drill bit comprises, but is not limited to, a diamond drill bit, so that drilling through the main body structure 6 and the enclosure structure 5 of the working well is ensured; the length of the drill rod ensures that the distance outside the enclosure structure 5 is more than or equal to 8m, but is not limited to 8m. After drilling, setting a freezing pipe 7, actively freezing to form a horizontal freezing wall 8 by connecting a freezing pipeline, and monitoring the state of the freezing wall. Normally, stable horizontal freeze walls 8 are essentially formed after 45 days of aggressive freezing. In addition, freezing is preferably accomplished by circulating chilled brine through the inner and outer tubing to reduce the temperature of the surrounding formation until frozen. In some embodiments, the drill rod acts as an outer tube of the freeze tube 7, for example: the outer tube and the inner tube of the freezing tube are 127mm and 89mm respectively, and the outer tube and the inner tube of the freezing tube are drilled by a 127mm drill rod and then are used as the outer tube of the freezing tube.
In some construction scenarios, when the stratum is a non-strongly permeable stratum, the freezing pipe 7 can be replaced by a pipe curtain for construction so as to connect the working well with the intact section of the accident tunnel.
S2: a hole is made in the working well and a safety door 9 is made so that the safety door 9 can open and close the hole. It should be noted that, the hole formed in this step is smaller than the caliber of the tunnel, the safety door 9 should be installed on the main body structure 6 of the working well, its size should be slightly larger than the size of the hole formed, and the periphery of the safety door should be provided with a waterproof rubber pad to ensure its tightness. In addition, the inside pressure device that can set up of working well guarantees can be with the guard gate closing under the infiltration condition.
In some construction scenes, the safety door 9 can be installed first, and then the holes are opened; or firstly constructing the hole of the main body structure 6 of the working well, then installing the safety door 9, and then constructing the hole on the enclosure structure 5 of the working well.
It is emphasized that in the hole opening of this time, the center of the opening hole is located in the middle or middle lower part of the contour line of the tunnel, so that the convenience of the earth discharge in the later-stage moving body excavation is ensured. The holes may be, but are not limited to, 1.5m by 1.5m rectangular or phi 1.5m circular.
S3: and excavating cement mortar 4 in the tunnel along the hole towards the tunnel intact section by adopting a step method, when chiseling the cement mortar to the vicinity of the blocking wall 3, chiseling out a partial shield segment 2 and chiseling and cleaning the target contact surface of the rest shield segment 2, wherein the primary support 10 is arranged along with the excavation section, and the target contact surface is a joint surface of the rest shield segment 2, which is used for being connected with the secondary lining 11.
In the implementation process, when the reinforcing structure set in the step S2 is the freezing pipe 7, the local freezing wall needs to be chiseled along with the process of chiseling the local shield segment 2, the freezing wall is monitored, and the water seepage condition around the tunnel is concerned; attention is paid to the protection of the freeze wall, if necessary, by providing the freeze wall with insulation means including, but not limited to, providing an insulation board at the freeze wall.
The primary support 10 comprises a round steel arch frame which is arranged in an excavation section and used for supporting a tunnel, a pouring layer is wrapped on the round steel arch frame, and a pouring structure is formed in the tunnel in a cast-in-place mode, so that a tubular reinforced concrete structure is formed in the tunnel.
S4: the water-swelling rubber 12 and the grouting pipe 13 are arranged, the second lining 11 is applied by adopting a retreating method to ensure firm connection with the shield tunnel, and the applied second lining 11 is positioned on the inner side of the primary support 10 and is firmly connected with the shield tunnel.
Preferably, the second lining 11 is bonded to the end face and the outer peripheral face of the shield segment 2, and the water-swellable rubber 12 is provided at the bonding portion between the second lining 11 and the shield segment 2. In some embodiments, the secondary liner 11 is a reinforced concrete structure, and the steel bars in the secondary liner 11 are connected with the steel bars in the shield segments 2.
S5.1: when the second lining 11 is constructed to the opening position of the working well, the safety door 9 is removed, the holes of the working well main body structure 6 and the enclosing structure 5 are enlarged, at the moment, the holes on the working well enclosing structure 5 are preferably identical to the outer contour line of the second lining 11, and the holes on the working well main body structure 6 are larger than the outer contour line of the second lining 11.
S5.2: a hole of a working well is provided with water-swelling rubber 12 and a grouting pipe 13, and a ring beam 14 is applied; the joints are subjected to supplementary grouting through the pre-buried grouting pipes 13. When the ring beam 14 is applied, the ring beam 14 can form a step-shaped ring beam 14 adaptively according to the shape of the hole, one end of the ring beam 14 can be combined with the second lining 11, the outer peripheral surface of the ring beam is combined with the main body structure 6 of the working well, and the steel bars at the combined part of the ring beam 14 are connected with the second lining 11 and the steel bars on the main body structure 6 of the working well into a whole, so that the ring beam 14 connects the second lining 11 and the main body structure 6 of the working well into a permanent whole.
S5.3: and cleaning the tunnel intact section to ensure that the blocking wall 3 in the tunnel intact section is cleaned and removed, so as to realize the penetration of the working well and the tunnel intact section. If the reinforcement structure in step S1 is the freezing pipe 7, it is necessary to shut down the freezing pipe 7 and fill and seal the freezing pipe 7 in this step.
It is to be understood that the terms "comprises" and "comprising," as used in this specification, mean the presence of the disclosed function, operation, or element, and is not limited to one or more additional functions, operations, and elements. In the present application, terms such as "comprising" and/or "having" may be construed to mean a particular feature, number, operation, constituent element, component, or combination thereof, but may not be construed to exclude the presence or addition of one or more other features, numbers, operations, constituent elements, components, or combination thereof.
It should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate describing the application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the application and is not intended to limit the application, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the application are intended to be included within the scope of the application.
Claims (10)
1. A method for locally repairing an accident tunnel, comprising the steps of:
S1: shi Zuogong working well, setting a reinforcing structure for reinforcing the periphery of the tunnel intact section from the working well towards the tunnel intact section;
S2: forming a hole and a safety door (9) on a working well, so that the safety door (9) can open and close the hole;
S3: excavating along the hole towards the tunnel intact section, along with arranging a primary support (10) in the excavated section;
s4: a second lining (11) is applied on the inner side of the primary support (10), and the second lining (11) is connected with the shield segment (2) of the tunnel intact section;
s5: and (3) dismantling the safety door (9), and applying a ring beam (14) at the hole to enable the ring beam (14) to be connected with the main body structure (6) and the secondary lining (11) of the working well, and then cleaning the tunnel intact section to enable the working well to be communicated with the tunnel intact section.
2. A method for the local repair of an accident tunnel according to claim 1, characterized in that in step S1, shi Zuogong, a blocking wall (3) is provided in the intact section of the tunnel, before the well is made.
3. The method for repairing a local portion of an accident tunnel according to claim 1, wherein in step S1, before Shi Zuogong is performed, grouting filling is performed in the tunnel at the boundary between the intact section and the broken section of the tunnel.
4. A method of local repair of an accident tunnel according to claim 1, characterised in that in step S1 the working well comprises an enclosure (5) and a body structure (6), the enclosure (5) comprising a wall/concrete pilings.
5. A method of local repair of an accident tunnel according to any one of claims 1 to 4, in which the reinforcing structure in step S1 comprises a freeze pipe (7), the freeze pipe (7) extending from the working well to the periphery of the intact tunnel section, the freeze pipe (7) being frozen to form a freeze wall, and then the freezing being stopped after construction of the ring beam (14) is completed.
6. A method for local repair of an accident tunnel according to claim 5, characterised in that the freezing pipes (7) are arranged in an inner and outer double loop.
7. A method for local repair of an accident tunnel according to claim 5, characterised in that the freezing pipe (7) comprises an inner pipe and an outer pipe, the mounting holes of the freezing pipe (7) being drilled with drill rods before the construction of the freezing pipe (7), and the drill rods then doubling as the outer pipe.
8. A method for the local repair of an accident tunnel according to any one of claims 1 to 4, characterised in that in step S3 the primary support (10) comprises a circular steel arch provided in the excavated section, the circular steel arch being wrapped with a casting layer.
9. The method for repairing a partial tunnel according to any one of claims 1 to 4, wherein in step S4, the secondary lining (11) is bonded to the end face and the outer peripheral face of the shield segment (2).
10. A method of local repair of an accident tunnel according to any one of claims 1 to 4, characterised in that in step S5 the holes are reamed before the ring beam (14) is applied so that the holes of the main structure (6) of the working well are larger than the outer contour of the secondary lining (11) and so that the holes of the maintenance structure of the working well are the same as the outer contour of the secondary lining (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410316402.6A CN118030113A (en) | 2024-03-20 | 2024-03-20 | Local repair method for accident tunnel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410316402.6A CN118030113A (en) | 2024-03-20 | 2024-03-20 | Local repair method for accident tunnel |
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| CN118030113A true CN118030113A (en) | 2024-05-14 |
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| CN202410316402.6A Pending CN118030113A (en) | 2024-03-20 | 2024-03-20 | Local repair method for accident tunnel |
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