CN115305957A - Final joint of immersed tunnel and construction method thereof - Google Patents
Final joint of immersed tunnel and construction method thereof Download PDFInfo
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- CN115305957A CN115305957A CN202210935991.7A CN202210935991A CN115305957A CN 115305957 A CN115305957 A CN 115305957A CN 202210935991 A CN202210935991 A CN 202210935991A CN 115305957 A CN115305957 A CN 115305957A
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- 238000010276 construction Methods 0.000 title claims abstract description 17
- 238000006073 displacement reaction Methods 0.000 claims abstract description 40
- 230000006835 compression Effects 0.000 claims abstract description 11
- 238000007906 compression Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 53
- 238000007789 sealing Methods 0.000 claims description 30
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/063—Tunnels submerged into, or built in, open water
- E02D29/073—Tunnels or shuttering therefor assembled from sections individually sunk onto, or laid on, the water-bed, e.g. in a preformed trench
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
- E02D31/025—Draining membranes, sheets or fabric specially adapted therefor, e.g. with dimples
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention relates to the technical field of immersed tunnel construction, in particular to a final joint of an immersed tunnel and a construction method thereof.A front end of a buried tunnel section is provided with an enlarged sleeve, a rear end of a final pipe joint is inserted into the enlarged sleeve, the front end of the final pipe joint and an immersed pipe section are arranged at intervals, a support beam extending along the axial direction of the enlarged sleeve is arranged below the front end of the final pipe joint, and the upper end of the support beam is abutted against the bottom wall of the final pipe joint; the bottom wall of the final pipe section is fixedly connected with two ejector pin type displacement meters which are oppositely arranged left and right, and ejector pins of the two ejector pin type displacement meters elastically eject the left side wall and the right side wall of the supporting beam respectively; and the control system controls each pushing device to push the final pipe joint to move forwards, and adjusts the extension speed of each pushing device according to the change value of the compression amount of the ejector pins of the two ejector pin type displacement meters, so that the front end surface of the final pipe joint is parallel to the rear end surface of the immersed tube section, and the final pipe joint is prevented from inclining left and right when moving to the outer side of the expanding sleeve.
Description
Technical Field
The invention relates to the technical field of immersed tube tunnel construction, in particular to a final joint of an immersed tube tunnel and a construction method thereof.
Background
The immersed tube tunnel is a large-scale underwater tunnel capable of passing through rivers and the sea, and has been widely applied to underwater tunnel construction due to strong engineering applicability, high economic cost ratio, shallow burying depth and flexible section shape setting. The connection position of the last end face of the last section of pipe section of the immersed tunnel is called a final joint, one end of the final joint is connected with the immersed pipe section positioned at the water bottom, the other end of the final joint is connected with the buried section positioned at the bank, and the construction quality between the immersed joint and the buried section and the immersed pipe section has great influence on the engineering quality of the whole immersed tunnel.
The push-type final joint has high construction efficiency, so the push-type final joint is widely applied; the push-push type final joint comprises an expansion sleeve, a final pipe joint and a pushing system, wherein one end of the expansion sleeve is used for being connected with a buried tunnel section, the final pipe joint is coaxially inserted into the other end of the expansion sleeve, a plurality of pushing devices used for pushing the final pipe joint out of the expansion sleeve are arranged in the expansion sleeve, the pushing devices are arranged at intervals along the inner peripheral side of the expansion sleeve, and the pushing devices can extend along the axial direction of the expansion sleeve, so that the final pipe joint is pushed out of the expansion sleeve. After the construction of the immersed tube section and the buried tunnel section is completed, the push-push type final joint is hung between the immersed tube section and the buried tunnel section, one end of the expanding sleeve is fixedly connected with the buried tunnel section, and the final tube joint is pushed out of the expanding sleeve by using the pushing device, so that the end part of the final tube joint is in sealing fit with the end part of the immersed tube section, and the installation of the push-push type final joint is realized.
However, since the elongation rates of the thrusters are difficult to be kept completely consistent, when the final pipe joint moves to the outside of the expanding sleeve, the final pipe joint is prone to tilt left and right, so that the front end face of the final pipe joint and the rear end face of the immersed tube section tilt, the sealing effect between the end of the final pipe joint and the end of the immersed tube section is poor, and water seepage occurs at the joint of the final pipe joint and the immersed tube section of the immersed tube tunnel.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the existing push-push type immersed tube tunnel final joint has the defects that the extension speed of each pushing device is difficult to keep completely consistent, and finally, a tube joint is easy to incline left and right when moving to the outer side of an expansion sleeve.
In order to solve the technical problems, the invention aims to provide a final joint of a immersed tunnel, which comprises a final pipe section, a control system, an expansion sleeve and a plurality of thrusters, wherein the expansion sleeve is arranged at the front end of a buried tunnel section, the rear end of the final pipe section is inserted into the expansion sleeve in a front-back sliding manner, the front end of the final pipe section is positioned outside the expansion sleeve, the front end of the final pipe section and the immersed tunnel section are arranged at intervals in the front-back direction, a supporting beam extending in the front-back direction is arranged below the interval, and the upper end of the supporting beam is abutted against the bottom wall of the final pipe section;
the rear end of the final pipe joint is connected with the expanding sleeve through each pushing device, so that each pushing device pushes the final pipe joint to move forwards;
the bottom wall of the final pipe joint is fixedly connected with two ejector pin type displacement meters which are oppositely arranged left and right, and ejector pins of the two ejector pin type displacement meters elastically eject the left side wall of the supporting beam and the right side wall of the supporting beam respectively; the two ejector pin type displacement meters and the pushing devices are electrically connected with the control system;
the control system controls each pushing device to push the final pipe joint forwards, the supporting beam pushes the ejector pins of the two ejector pin type displacement meters, and the control system adjusts the extension speed of each pushing device according to the variation value of the compression amount of the ejector pins of the two ejector pin type displacement meters.
Preferably, rolling members are arranged at the end parts of the thimbles of the two thimble type displacement meters, and each rolling member is respectively abutted against the left side wall of the supporting beam and the right side wall of the supporting beam.
Preferably, the cross section of the final pipe section is square, the support beams are arranged at intervals from left to right along the bottom wall of the final pipe section, and the two ejector pin displacement meters are respectively arranged on the left side and the right side of one of the support beams.
A construction method of the final joint of the immersed tube tunnel comprises the following steps:
step S1, arranging support beams which are arranged at intervals with the front and the back of an expanded sleeve in front of the expanded sleeve;
s2, prefabricating a final pipe joint at the upper end of the support beam;
s3, inserting the rear end of the final pipe joint into the expansion sleeve;
s4, arranging a plurality of pushing devices in the expansion sleeve, arranging two ejector pin type displacement meters on the bottom wall of the final pipe section, and respectively pushing the left side wall of the supporting beam and the right side wall of the supporting beam by the ejector pins of the two ejector pin type displacement meters;
and S5, pushing out the final pipe joint by using each pushing device, so that the front end of the final pipe joint is in sealing fit with the rear end of the sinking pipe section.
Preferably, the step S1 comprises:
s0, arranging a cofferdam near the rear end of the immersed tube segment, and constructing a foundation in the cofferdam;
in the step S1, the lower end of the support beam is buried in the foundation.
Preferably, a first sealing door is arranged at the front end of the final pipe joint, the final joint of the immersed tunnel comprises a telescopic water stop belt, the telescopic water stop belt is sleeved on the outer peripheral side of the final pipe joint, the rear end of the telescopic water stop belt is fixedly connected with the front end of the expansion sleeve, and the front end of the telescopic water stop belt is fixedly connected with the outer peripheral side of the final pipe joint;
the inside second that is equipped with of rear end of immersed tube section seals the door, press from both sides between the preceding terminal surface of final tube coupling and the rear end face of immersed tube section and be equipped with the first stagnant water bag that is cyclic annular and arranges, include after step S4:
and S41, removing the cofferdam.
Preferably, the step S5 includes:
s51, pushing the final pipe joint forwards through each pushing device to enable the final pipe joint to be preliminarily in compression joint with the immersed pipe section;
step S52, filling fluid into the first water stopping bag to enable a cavity between the first sealing door and the second sealing door to form a sealing cavity;
s53, pumping accumulated water in the sealed cavity;
and S54, pushing the final pipe joint forwards through the pushing devices to crimp the first water stopping bag.
Preferably, in step S3, a power system is provided in the enlarged sleeve to pull the rear end of the final pipe joint into the enlarged sleeve.
Preferably, the inner side wall of the enlarged sleeve is provided with a stop structure protruding inward, the front end of the stop structure and the rear end of the final pipe joint are arranged at a front-rear relative interval, and after the step S5, the method includes:
and S6, grouting is performed on a gap between the rear end of the final pipe joint and the front end of the stopping structure.
Preferably, the step S6 includes:
s61, arranging a connecting piece in the final pipe joint, wherein one end of the connecting piece can be detachably connected to the inner side wall of the final pipe joint, and the other end of the connecting piece can be detachably connected to the inner side wall of the sinking pipe section;
s62, grouting is conducted on a gap between the rear end of the final pipe joint and the front end of the stopping structure;
and S63, removing the connecting piece, and arranging an annular water stop belt on the inner side of the joint of the final pipe joint and the immersed pipe section.
Compared with the prior art, the invention has the beneficial effects that:
according to the final joint of the immersed tunnel, the expansion sleeve is arranged at the front end of the buried tunnel section, the rear end of the final pipe joint can be inserted into the expansion sleeve in a front-back sliding manner, the front end of the final pipe joint is positioned outside the expansion sleeve, and the front end of the final pipe joint and the immersed pipe section are arranged at intervals in the front-back direction; a supporting beam extending along the front-rear direction is arranged below the gap, and the upper end of the supporting beam is abutted against the bottom wall of the final pipe joint; the rear end of the final pipe joint is connected with the expanding sleeve through each pushing device so that each pushing device pushes the final pipe joint to move forwards, the bottom wall of the final pipe joint is fixedly connected with two thimble type displacement meters which are oppositely arranged left and right, and thimbles of the two thimble type displacement meters elastically press the left side wall and the right side wall of the supporting beam respectively; the two ejector pin type displacement meters and the ejector devices are electrically connected with the control system, the control system controls the ejector devices to push the final pipe joint to move forwards, and the control system can adjust the extension speed of the ejector devices according to the change value of the compression amount of the ejector pins of the two ejector pin type displacement meters, so that the front end face of the final pipe joint is parallel to the rear end face of the immersed pipe section, and the left-right inclination of the final pipe joint when the final pipe joint moves to the outer side of the expanding sleeve is avoided.
Drawings
Fig. 1 is a length square sectional view of a final joint of a sinking tunnel according to the present invention;
FIG. 2 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic structural view of the final pipe section before it is pulled into the enlarged sleeve;
FIG. 4 is a schematic view of the final pipe section after it has been pulled into the enlarged sleeve;
FIG. 5 is a schematic structural view of the final pipe joint after butt joint with the sinking pipe section;
FIG. 6 is a schematic view of the final pipe joint after grouting in the gap between the rear end and the front end of the stop structure;
FIG. 7 is a schematic view of the final pipe joint and the sink pipe section after a water stop is installed on the inner sides of the pipe joints;
in the figure, 1, the final pipe section; 11. a first sealing door; 12. a telescopic water stop; 13. a first water stop bladder; 14. a second water stop bag; 15. sealing the cavity; 2. a pushing device; 3. burying a tunnel section in a concealed manner; 31. expanding the sleeve; 32. a third sealing door; 4. sinking the pipe section; 41. coffering; 42. a second sealing door; 5. a support beam; 6. a thimble type displacement meter; 7. a connecting member; 8. an annular water stop.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are used only to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
As shown in fig. 1 to 7, a preferred embodiment of a final joint of a immersed tunnel according to the present invention comprises a final pipe joint 1, a control system, an expanding sleeve 31 and a plurality of thrusters 2, wherein the expanding sleeve 31 is disposed at the front end of a buried tunnel section 3, the rear end of the final pipe joint 1 is slidably inserted into the expanding sleeve 31 back and forth, the front end of the final pipe joint 1 is located outside the expanding sleeve 31, the front end of the final pipe joint 1 and the rear end of the immersed tunnel section 4 are arranged at a distance from each other front to back, and a supporting beam 5 extending in the front-back direction is disposed below the front end of the final pipe joint 1, and the upper end of the supporting beam 5 abuts against the bottom wall of the final pipe joint 1; finally, the bottom wall of the pipe section 1 is fixedly connected with two ejector pin type displacement meters 6 which are oppositely arranged left and right, and the ejector pins of the two ejector pin type displacement meters 6 elastically eject against the left side wall of the supporting beam 5 and the right side wall of the supporting beam 5 respectively; each thruster 2 is arranged around the inner peripheral side of the expanding sleeve 31 at intervals, and the two thimble type displacement meters 6 and each thruster 2 are electrically connected with a control system; the control system controls each pushing device 2 to push the final pipe joint 1 forwards, the supporting beams 5 push the ejector pins of the two ejector pin type displacement meters 6, and the control system adjusts the extension speed of each pushing device 2 according to the change value of the compression amount of the ejector pins of the two ejector pin type displacement meters 6 so that the front end face of the final pipe joint 1 is parallel to the rear end face of the immersed pipe section 4, therefore, the final pipe joint 1 is prevented from inclining left and right when moving to the outer side of the enlarged sleeve 2, and water seepage at the joint of the final pipe joint and the immersed pipe section is prevented. Specifically, when the final pipe joint 1 is inclined left and right, one of the compression amounts of the thimbles of the two thimble type displacement meters 6 is increased, and the other compression amount is decreased, and the inclination direction of the final pipe joint 1 can be judged by calculating the change value of the compression amounts of the thimbles of the two thimble type displacement meters 6.
The expanding sleeve 31 can be integrally formed with the buried tunnel segment 3, or can be separately processed and then fixedly connected to the front end of the buried tunnel segment 3 through a connecting structure; in order to avoid excessive abrasion of the end parts of the ejector pins of the ejector pin type displacement meters in the final pipe joint movement process, rolling parts are arranged at the end parts of the ejector pins of the two ejector pin type displacement meters 6, and the rolling parts are respectively abutted against the left side wall of the supporting beam 5 and the right side wall of the supporting beam 5. Specifically, the rolling element is a roller or a ball embedded at the end of a thimble of the thimble type displacement meter.
In the embodiment, the section of the final pipe joint 1 is square, a plurality of supporting beams 5 are arranged along the bottom wall of the final pipe joint 1 from front to back at intervals, and two ejector pin type displacement meters 6 are respectively arranged on the left side and the right side of one supporting beam 5; specifically, the supporting beam 5 is an i-steel, the length of the i-steel extends along the front and rear squares, and the i-steels are uniformly arranged along the bottom wall of the final pipe joint 1 at intervals from left to right.
An embodiment of the construction method of the final joint of the immersed tube tunnel comprises the following steps:
step S1, arranging a support beam 5 which is arranged at a distance from the front and the back of an expansion sleeve 31 in front of the expansion sleeve 31;
s2, prefabricating a final pipe joint 1 at the upper end of the support beam 5;
s3, inserting the rear end of the final pipe joint 1 into the expansion sleeve 31;
step S4, arranging a plurality of thrusters 2 in the expanding sleeve 31, arranging two thimble type displacement meters 6 on the bottom wall of the final pipe joint 1, and respectively jacking thimbles of the two thimble type displacement meters 6 against the left side wall of the supporting beam 5 and the right side wall of the supporting beam 5;
and S5, pushing out the final pipe joint 1 by utilizing each pushing device 2, so that the front end of the final pipe joint 1 is in sealing fit with the rear end of the sinking pipe section 4.
Wherein, step S1 comprises:
step S0, arranging a cofferdam 41 near the rear end of the immersed tube section 4, and constructing a foundation in the cofferdam 41; specifically, the cofferdam 41 is arranged in a C shape, the opening of the cofferdam 41 faces the shore, an anhydrous foundation pit is formed in the cofferdam, the bottom of the foundation pit is lower than the bottom walls of the immersed tube section 4 and the enlarged sleeve 21, and in the step S1, the lower end of the support beam 5 is buried in the foundation.
In step S3, as shown in fig. 3 and 4, a power system is provided in the enlarged sleeve 31 to pull the rear end of the final pipe joint 1 into the enlarged sleeve 31. Specifically, driving system includes a plurality of tension devices, and each tension device all includes jack, wire rope and draws and close the support, draws and close the support and fixes the inboard at final coupling 1, and the jack is fixed in expanding sleeve 31 inboard, and the jack is connected to wire rope's one end, and the other end is connected and is drawn and close the support, and tension device is equipped with a plurality ofly, and a plurality of tension devices are arranged around the internal periphery side that expands sleeve 2.
In this embodiment, the first sealing door 11 is arranged at the front end of the final pipe joint 1, the final joint of the immersed tunnel comprises a telescopic water stop 12, the telescopic water stop 12 is sleeved on the outer peripheral side of the final pipe joint 1, the rear end of the telescopic water stop 12 is fixedly connected with the front end of the expansion sleeve 31, and the front end of the telescopic water stop 12 is fixedly connected with the outer peripheral side of the final pipe joint 1; a second sealing door 42 is arranged inside the rear end of the sinking pipe section 4, a first water stopping bag 13 which is annularly arranged is clamped between the front end face of the final pipe section 1 and the rear end face of the sinking pipe section 4, specifically, as shown in fig. 3, a second water stopping bag 14 is arranged at the position, close to the front end, of the inner side of the expanding sleeve 31, the second water stopping bag 14 is annularly shaped, and an annular groove for accommodating the second water stopping bag 14 is arranged on the inner side of the expanding sleeve 31, so that the sealing property between the expanding sleeve 31 and the final pipe section 1 is further improved; the second water stop bladder 14 is mounted in the annular groove before the final pipe section 1 is pulled into the enlarged sleeve 31. Step S4 is followed by step S41 of removing the cofferdam 41. After step S4 and before step S41, the pulling seat and the wire rope are removed, then the water stop 12 is extended between the expanding sleeve 31 and the final pipe joint 1, the lower water stop bag 13 is arranged on the front end surface of the final pipe joint 1, and then the first sealing door 11 is installed on the front end of the final pipe joint 1.
Wherein, step S5 includes:
s51, pushing the final pipe joint 1 forward through each pushing device 2 to enable the final pipe joint 1 to be preliminarily in compression joint with the immersed pipe section 4;
step S52, filling fluid into the first water stopping bag 13 to enable a cavity between the first sealing door 11 and the second sealing door 42 to form a sealing cavity 15;
s53, pumping accumulated water in the sealing cavity 15;
and S54, pushing the final pipe joint 1 forwards through each pushing device 2, and crimping the first water stopping bag 13.
Specifically, in this embodiment, after step S41, before step S51, the method further includes:
step S42, sinking a second immersed tube section to the end part of the immersed tube section 4; specifically, the immersed tube section comprises a second immersed tube section and a plurality of first immersed tube sections, the first immersed tube sections are sequentially connected end to end, the structure of the second immersed tube section is the same as that of the first immersed tube sections, the second immersed tube section is not installed before the final tube joint is prefabricated, so that enough space is reserved in a foundation pit formed by the cofferdam for machining the final tube section, after the final tube section 1 is pulled into the expansion sleeve 31, the cofferdam 41 is detached, then the second immersed tube is sunk in place, and then the final tube 1 is connected with the rear end of the second immersed tube, so that construction is facilitated.
It should be noted that the second sealing door 42 is arranged in the second immersed tube fitting, after the cofferdam 41 is removed, the foundation pit is filled with river water or lake water, and after the final pipe joint 1 is preliminarily crimped with the immersed tube section 4, the space between the second sealing door 42 and the first sealing door 11 is completely filled with water, at this time, if the final pipe fitting is continuously pushed forward, the accumulated water in the sealed cavity 15 cannot flow out, and the accumulated water can flush the first water stopping bag 13, so that the accumulated water in the sealed cavity 15 is pumped out after the final pipe joint 1 is preliminarily crimped with the immersed tube section 4, and then the final pipe joint 1 is pushed forward by each pushing device 2 to crimp the first water stopping bag 13, thereby ensuring the sealing effect between the final pipe joint 1 and the immersed tube section 4. In order to further improve the water resistance of the final joint, in this embodiment, as shown in fig. 4, a third sealing door 32 is provided on the inner side of the enlarged sleeve.
In this embodiment, as shown in fig. 6, the inner side wall of the enlarged sleeve 31 is provided with a stop structure 311 protruding inward, the front end of the stop structure 311 and the rear end of the final pipe joint 1 are arranged in front and rear opposition, and after the step S5, the method includes:
and S6, grouting is performed on a gap between the rear end of the final pipe joint 1 and the front end of the stop structure 311.
Specifically, step S6 includes:
s61, arranging a connecting piece 7 in the final pipe joint 1, wherein one end of the connecting piece 7 is detachably connected to the inner side wall of the final pipe joint 1, and the other end of the connecting piece 7 is detachably connected to the inner side wall of the sinking pipe section 4;
step S62, grouting is carried out on a gap between the rear end of the final pipe joint 1 and the front end of the stop structure 311;
and S63, removing the connecting piece 7, and arranging an annular water stop 8 on the inner side of the joint of the final pipe joint 1 and the sinking pipe section 4. Specifically, the annular water stop 8 is an Ω water stop.
In conclusion, in the immersed tunnel final joint, the control system controls each pushing device 2 to push the final pipe joint 1 forwards, and the control system adjusts the extension speed of each pushing device 2 according to the change value of the compression amount of the ejector pins of the two ejector pin type displacement meters 6, so that the front end surface of the final pipe joint 1 is parallel to the rear end surface of the immersed pipe section 4, the final pipe joint 1 is prevented from inclining left and right when moving to the outer side of the expanding sleeve 2, and water seepage at the joint of the final pipe joint and the immersed pipe section is prevented.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. The immersed tunnel final joint is characterized by comprising a final pipe joint (1), a control system, an expansion sleeve (31) and a plurality of thrusters (2), wherein the expansion sleeve (31) is arranged at the front end of a buried tunnel section (3), the rear end of the final pipe joint (1) can be inserted into the expansion sleeve (31) in a front-back sliding manner, the front end of the final pipe joint (1) is positioned outside the expansion sleeve (31), the front end of the final pipe joint (1) and an immersed pipe section (4) are arranged at a front-back interval, a supporting beam (5) extending along the front-back direction is arranged below the interval, and the upper end of the supporting beam (5) is abutted to the bottom wall of the final pipe joint (1);
the rear end of the final pipe joint (1) is connected with the expanding sleeve (31) through each pushing device (2) so that each pushing device (2) pushes the final pipe joint (1) to move forwards;
the bottom wall of the final pipe joint (1) is fixedly connected with two thimble type displacement meters (6) which are oppositely arranged left and right, and thimbles of the two thimble type displacement meters (6) elastically prop against the left side wall of the supporting beam (5) and the right side wall of the supporting beam (5) respectively; the two ejector pin type displacement meters (6) and each ejector device (2) are electrically connected with the control system;
the control system controls each pushing device (2) to push the final pipe joint (1) forwards, the supporting beam (5) pushes the ejector pins of the two ejector pin type displacement meters (6), and the control system adjusts the extension speed of each pushing device (2) according to the change value of the compression amount of the ejector pins of the two ejector pin type displacement meters (6).
2. Final joint for immersed tunnel according to claim 1, characterized in that the tips of the pins of both pin displacement gauges (6) are provided with rolling elements, each abutting against the left side wall of the support beam (5) and the right side wall of the support beam (5).
3. The immersed tunnel final joint according to claim 1, wherein the section of the final pipe section (1) is square, the support beams (5) are arranged in a plurality from left to right along the bottom wall of the final pipe section (1), and two thimble type displacement meters (6) are respectively arranged on the left side and the right side of one of the support beams (5).
4. A method for constructing a final joint of a immersed tunnel according to any one of claims 1 to 3, comprising the steps of:
s1, arranging a support beam (5) which is arranged in front of and behind an expansion sleeve (31) at a distance from the expansion sleeve (31);
s2, prefabricating a final pipe section (1) at the upper end of the supporting beam (5);
s3, inserting the rear end of the final pipe joint (1) into the expansion sleeve (31);
s4, arranging a plurality of pushing devices (2) in the expansion sleeve (31), arranging two ejector pin type displacement meters (6) on the bottom wall of the final pipe joint (1), and respectively pushing the left side wall of the supporting beam (5) and the right side wall of the supporting beam (5) by the ejector pins of the two ejector pin type displacement meters (6);
and S5, pushing out the final pipe joint (1) by utilizing each pushing device (2) so that the front end of the final pipe joint (1) is in sealing fit with the rear end of the sinking pipe section (4).
5. The construction method of the final joint of the immersed tunnel according to claim 4, wherein the step S1 is preceded by:
s0, arranging a cofferdam (41) near the rear end of the immersed tube section (4), and constructing a foundation in the cofferdam (41);
in the step S1, the lower end of the support beam (5) is buried in the foundation.
6. The construction method of the final joint of the immersed tunnel according to claim 5, wherein the front end of the final pipe joint (1) is provided with a first sealing door (11), the final joint of the immersed tunnel comprises a telescopic water stop (12), the telescopic water stop (12) is sleeved on the outer peripheral side of the final pipe joint (1), the rear end of the telescopic water stop (12) is fixedly connected with the front end of the expansion sleeve (31), and the front end of the telescopic water stop (12) is fixedly connected with the outer peripheral side of the final pipe joint (1);
the inside second that is equipped with of rear end of heavy pipeline section (4) seals door (42), press from both sides between the preceding terminal surface of final pipe coupling (1) and the rear end surface of heavy pipeline section (4) and be equipped with first stagnant water bag (13) that are cyclic annular and arrange, include after step S4:
and S41, dismantling the cofferdam (41).
7. The construction method of a final joint of a immersed tunnel according to claim 6, wherein the step S5 comprises:
s51, pushing the final pipe joint (1) forwards through each pushing device (2) to enable the final pipe joint (1) to be preliminarily in pressure joint with the immersed pipe section (4);
s52, filling fluid into the first water stop bag (13) to enable a cavity between the first sealing door (11) and the second sealing door (42) to form a sealing cavity (15);
s53, pumping accumulated water in the sealed cavity (15);
and S54, pushing the final pipe joint (1) forward through each pushing device (2) to crimp the first water stopping bag (13).
8. The method for constructing a final joint of a immersed tunnel according to claim 4, wherein in the step S3, a power system is arranged in the enlarged sleeve (31) to pull the rear end of the final pipe section (1) into the enlarged sleeve (31).
9. The construction method of the final joint of the immersed tube tunnel according to claim 4, wherein the inner side wall of the enlarged sleeve (31) is provided with a stop structure (311) protruding inwards, the front end of the stop structure (311) and the rear end of the final tube section (1) are arranged in a front-back opposite interval, and the step S5 comprises the following steps:
and S6, grouting is conducted on a gap between the rear end of the final pipe joint (1) and the front end of the stopping structure (311).
10. The method for constructing a final joint of a immersed tube tunnel according to claim 9, wherein the step S6 comprises:
s61, arranging a connecting piece (7) in the final pipe joint (1), wherein one end of the connecting piece (7) is detachably connected to the inner side wall of the final pipe joint (1), and the other end of the connecting piece (7) is detachably connected to the inner side wall of the sinking pipe section (4);
s62, grouting is performed on a gap between the rear end of the final pipe joint (1) and the front end of the stopping structure (311);
and S63, removing the connecting piece (7), and arranging an annular water stop (8) on the inner side of the joint of the final pipe joint (1) and the immersed pipe section (4).
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