CN115305957B - Final joint for immersed tube tunnel and its construction method - Google Patents
Final joint for immersed tube tunnel and its construction method Download PDFInfo
- Publication number
- CN115305957B CN115305957B CN202210935991.7A CN202210935991A CN115305957B CN 115305957 B CN115305957 B CN 115305957B CN 202210935991 A CN202210935991 A CN 202210935991A CN 115305957 B CN115305957 B CN 115305957B
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- expansion sleeve
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- 238000010276 construction Methods 0.000 title claims abstract description 18
- 238000006073 displacement reaction Methods 0.000 claims abstract description 40
- 230000006835 compression Effects 0.000 claims abstract description 12
- 238000007906 compression Methods 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 45
- 238000007789 sealing Methods 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 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
- 238000002788 crimping Methods 0.000 claims description 2
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 210000001503 joint Anatomy 0.000 claims 1
- 238000005086 pumping Methods 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000000694 effects Effects 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
Classifications
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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
-
- 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
Abstract
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, wherein the front end of a buried tunnel section is provided with an expansion sleeve, the rear end of a final tube section is inserted into the expansion sleeve, the front end of the final tube section is arranged at intervals with the immersed tube section, a supporting beam extending along the axial direction of the expansion sleeve is arranged below the front end of the final tube section, and the upper end of the supporting beam is abutted with the bottom wall of the final tube section; 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 the thimbles of the two thimble type displacement meters elastically push against the left side wall and the right side wall of the supporting beam respectively; the control system controls each pushing device to push the final pipe section 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 face of the final pipe section is parallel to the rear end face of the sinking pipe section, and the final pipe section is prevented from tilting left and right when moving to the outer side of the expansion 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 underwater tunnel capable of crossing the river and the sea, and has high engineering applicability, high economical efficiency and cost ratio, shallow burying and flexible section shape setting, and is widely applied to underwater tunnel construction. The joint of the last end face of the last section of the immersed tube tunnel is called a final joint, one end of the final joint is connected with the immersed tube 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 tube joint and the buried section and the immersed tube section greatly affects the engineering quality of the whole immersed tube tunnel.
The construction efficiency of the pushing type final joint is high, so that the pushing type final joint is widely applied; the pushing 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 out the final pipe joint outside 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 pushing type final joint is hung between the immersed tube section and the buried tunnel section, one end of the expansion sleeve is fixedly connected with the buried tunnel section, the pushing device is utilized to push out the final tube section from the expansion sleeve, and the end of the final tube section is sealed and attached with the end of the immersed tube section, so that the installation of the pushing type final joint is realized.
However, since the extension speeds of the thrusters are difficult to be kept completely consistent, when the final pipe section moves to the outside of the expansion sleeve, the final pipe section is easy to incline left and right, so that the front end face of the final pipe section and the rear end face of the immersed pipe section incline, the sealing effect between the end of the final pipe section and the end of the immersed pipe section is poor, and water seepage occurs at the joint of the final pipe section and the immersed pipe section in the immersed pipe tunnel.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: in the existing final joint of the pushing type immersed tube tunnel, the extension speed of each pushing device is difficult to be kept completely consistent, and the final tube section is easy to incline left and right when moving to the outer side of the expansion sleeve.
In order to solve the technical problems, the invention aims to provide a final joint of a immersed tube tunnel, which comprises a final tube 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 tube section is slidably inserted into the expansion sleeve back and forth, the front end of the final tube section is positioned outside the expansion sleeve, the front end of the final tube section and the immersed tube section are arranged at intervals back and forth, support beams extending along the front-back direction are arranged below the intervals, and the upper ends of the support beams are abutted against the bottom wall of the final tube section;
the rear end of the final pipe joint is connected with the expansion sleeve through the pushing devices, so that the pushing devices push 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 the thimbles of the two thimble type displacement meters elastically push against the left side wall of the supporting beam and the right side wall of the supporting beam respectively; the two thimble 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 change value of the compression amount of the ejector pins of the two ejector pin type displacement meters.
Preferably, rolling elements are arranged at the end parts of the thimbles of the two thimbles type displacement meters, and each rolling element is respectively abutted with the left side wall of the supporting beam and the right side wall of the supporting beam.
Preferably, the section of the final pipe section is square, the supporting beams are arranged at intervals from left to right along the bottom wall of the final pipe section, and the two thimble type displacement meters are respectively arranged at the left side and the right side of one supporting beam.
The construction method of the final joint of the immersed tube tunnel comprises the following steps:
s1, arranging supporting beams which are arranged at intervals in front of and behind an expansion sleeve in front of the expansion sleeve;
s2, prefabricating a final pipe joint at the upper end of the supporting beam;
s3, inserting the rear end of the final pipe joint into the expansion sleeve;
s4, arranging a plurality of thrusters in the expansion sleeve, arranging two thimble-type displacement meters on the bottom wall of the final pipe joint, and respectively propping the left side wall of the supporting beam and the right side wall of the supporting beam by the thimbles of the two thimble-type displacement meters;
and S5, pushing out the final pipe joint by utilizing each pushing device, so that the front end of the final pipe joint is in sealing fit with the rear end of the immersed pipe section.
Preferably, the step S1 includes:
s0, arranging a cofferdam near the rear end of the sedimentation pipe section, and performing foundation construction in the cofferdam;
in the step S1, the lower end of the support beam is buried in the foundation.
As a preferable scheme, 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, the telescopic water stop is sleeved on the outer peripheral side of the final pipe joint, the rear end of the telescopic water stop is fixedly connected with the front end of the expansion sleeve, and the front end of the telescopic water stop is fixedly connected with the outer peripheral side of the final pipe joint;
the inside second door that seals that is equipped with of rear end of immersed tube section, the preceding terminal surface of final tube coupling with it is cyclic annular first water-stop bag of arranging to press from both sides between the rear end face of immersed tube section, include after step S4:
and S41, dismantling the cofferdam.
Preferably, the step S5 includes:
step S51, pushing the final pipe joint forwards through each pushing device to enable the final pipe joint to be in primary compression joint with the immersed pipe section;
step S52, filling fluid into the first water-stop bag so that a sealed cavity is formed by a cavity between the first sealing door and the second sealing door;
step S53, extracting accumulated water in the sealed cavity;
and S54, pushing the final pipe joint forwards through each pushing device, and crimping the first water stopping bag.
Preferably, in the step S3, a power system is disposed in the expansion sleeve to pull the rear end of the final pipe joint into the expansion sleeve.
As a preferred scheme, the inside wall of expansion sleeve is equipped with inwards protruding stop structure, stop structure 'S front end with the relative interval arrangement in back and forth of final tube coupling' S rear end, include after step S5:
and S6, grouting a gap between the rear end of the final pipe joint and the front end of the stop structure.
Preferably, the step S6 includes:
step S61, arranging a connecting piece in the final pipe section, wherein one end of the connecting piece is detachably connected to the inner side wall of the final pipe section, and the other end of the connecting piece is detachably connected to the inner side wall of the sinking pipe section;
step S62, grouting a gap between the rear end of the final pipe joint and the front end of the stop structure;
and S63, removing the connecting piece, and arranging an annular water stop belt at 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:
the final joint of the immersed tube tunnel is characterized in that an expansion sleeve is arranged at the front end of a buried tunnel section, the rear end of a final tube section can be inserted into the expansion sleeve in a front-back sliding manner, the front end of the final tube section is positioned outside the expansion sleeve, and the front end of the final tube section and the immersed tube section are arranged at intervals front and back; a supporting beam extending along the front-back direction is arranged below the interval, and the upper end of the supporting beam is abutted with the bottom wall of the final pipe joint; the rear end of the final pipe joint is connected with the expansion 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 the thimbles of the two thimble type displacement meters elastically push the left side wall and the right side wall of the supporting beam respectively; the two thimble type displacement meters and the thrusters are electrically connected with the control system, the control system controls the thrusters to push the final pipe joint to move forwards, and the control system can adjust the extension speed of the thrusters according to the change value of the compression amount of the thimbles of the two thimble 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 enlarged sleeve is avoided.
Drawings
FIG. 1 is a lengthwise square cross-sectional view of the final joint of a immersed tube tunnel of the present invention;
FIG. 2 is a square cross-sectional view of A-A in FIG. 1;
FIG. 3 is a schematic view of the structure before pulling the final tube segment into the enlarged sleeve;
FIG. 4 is a schematic view of the structure after pulling the final tube segment into the enlarged sleeve;
FIG. 5 is a schematic view of the structure of the final pipe section after docking with the immersed pipe section;
FIG. 6 is a schematic view of the structure after grouting at the gap between the rear end of the final pipe section and the front end of the stop structure;
FIG. 7 is a schematic view of the structure after installing a water stop at the inside of the final pipe section and the immersed pipe section;
in the figure, 1, a final pipe joint; 11. a first door; 12. a telescopic water stop; 13. a first water stop bladder; 14. a second water stop bladder; 15. sealing the cavity; 2. a pushing device; 3. a buried tunnel section; 31. enlarging the sleeve; 32. a third door; 4. sinking pipe sections; 41. a cofferdam; 42. a second door; 5. a support beam; 6. a thimble type displacement meter; 7. a connecting piece; 8. an annular water stop.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. It should be understood that the terms "first," "second," and the like are used herein to describe various information, but such information should not be limited to these terms, which are used merely to distinguish one type of information from another. For example, a "first" message may also be referred to as a "second" message, and similarly, a "second" message may also be referred to as a "first" message, without departing from the scope of the 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 section 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 section 1 is slidably inserted into the expansion sleeve 31 back and forth, the front end of the final pipe section 1 is positioned outside the expansion sleeve 31, the front end of the final pipe section 1 and the rear end of the immersed tunnel section 4 are arranged at intervals, a supporting beam 5 extending along the front-rear direction is arranged below the intervals, specifically, the supporting beam 5 is arranged below the front end of the final pipe section 1, and the upper end of the supporting beam 5 is abutted against the bottom wall of the final pipe section 1; 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 the thimbles of the two thimble type displacement meters 6 elastically push against the left side wall of the supporting beam 5 and the right side wall of the supporting beam 5 respectively; each pushing device 2 is arranged around the inner peripheral side of the expansion sleeve 31 at intervals, and the two thimble type displacement meters 6 and each pushing device 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 beam 5 pushes the ejector pins of the two ejector pin type displacement meters 6, and adjusts the extension speed of each pushing device 2 according to the change value of the compression quantity 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, the left-right inclination of the final pipe joint 1 when moving towards the outer side of the expansion sleeve 2 is avoided, and water seepage at the joint of the final pipe joint and the immersed pipe section is prevented. Specifically, when the final pipe section 1 is tilted left and right, one of the compression amounts of the thimbles of the two thimbles of the displacement meter 6 is increased, the other compression amount is decreased, and the tilt direction of the final pipe section 1 can be determined by calculating the change value of the compression amounts of the thimbles of the two thimbles of the displacement meter 6.
The expansion sleeve 31 can be integrally formed with the buried tunnel section 3, or can be fixedly connected to the front end of the buried tunnel section 3 through a connecting structure after being independently processed; in order to avoid overlarge wear of the end parts of the thimbles of the two thimbles of the displacement meter 6 in the final pipe joint movement process, rolling elements are arranged at the end parts of the thimbles of the two thimbles of the displacement meter 6 and respectively abutted with 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 part 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 at intervals from front to back along the bottom wall of the final pipe joint 1, and two thimble type displacement meters 6 are respectively arranged at the left side and the right side of one supporting beam 5; specifically, the support beams 5 are i-beams, the length squares of which extend along the front and rear squares, and the i-beams are uniformly arranged at intervals from left to right along the bottom wall of the final pipe section 1.
An embodiment of the construction method of the immersed tube tunnel final joint comprises the following steps:
step S1, arranging supporting beams 5 which are arranged at intervals in front of the expansion sleeve 31 and in front of and behind the expansion sleeve 31;
s2, prefabricating a final pipe joint 1 at the upper end of the supporting beam 5;
step 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 expansion sleeve 31, arranging two thimble type displacement meters 6 on the bottom wall of the final pipe joint 1, and respectively propping the left side wall of the supporting beam 5 and the right side wall of the supporting beam 5 by the thimbles of the two thimble 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 immersed pipe section 4.
Wherein, before step S1, the method comprises:
s0, arranging a cofferdam 41 near the rear end of the immersed tube section 4, and performing foundation construction in the cofferdam 41; specifically, the cofferdam 41 is C-shaped, 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 immersed tube section 4 and the bottom wall of the expansion sleeve 21, and in step S1, the lower end of the supporting beam 5 is buried in the foundation.
In step S3, as shown in fig. 3 and 4, a power system is provided in the expansion sleeve 31 to pull the rear end of the final pipe joint 1 into the expansion sleeve 31. Specifically, the driving system comprises a plurality of tension devices, each tension device comprises a jack, a steel wire rope and a pull-in support, the pull-in support is fixed on the inner side of the final pipe joint 1, the jack is fixed on the inner side of the expansion sleeve 31, one end of the steel wire rope is connected with the jack, the other end of the steel wire rope is connected with the pull-in support, the tension devices are provided with a plurality of tension devices, and the tension devices are arranged around the inner circumference side of the expansion sleeve 2.
In the embodiment, a first sealing door 11 is arranged at the front end of a final pipe joint 1, a immersed tunnel final joint 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 an 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 of the rear end of the immersed tube segment 4 is provided with a second sealing door 42, a first water stop bag 13 which is annularly arranged is clamped between the front end face of the final tube segment 1 and the rear end face of the immersed tube segment 4, specifically, as shown in fig. 3, the position, close to the front end, of the inner side of the expansion sleeve 31 is provided with a second water stop bag 14, the second water stop bag 14 is annular, the inner side of the expansion sleeve 31 is provided with an annular groove for accommodating the second water stop bag 14, and therefore the tightness between the expansion sleeve 31 and the final tube segment 1 is further improved; the second water-stop capsule 14 is mounted in the annular recess before the final tube segment 1 is pulled into the enlarged sleeve 31. Step S4 is followed by step S41, and the cofferdam 41 is removed. After step S4, before step S41, the pull-in seat and the wire rope are removed, then the telescopic water stop 12 is arranged between the expansion sleeve 31 and the final pipe section 1, the front end surface of the final pipe section 1 is lower than the first water stop bag 13, and then the first sealing door 11 is arranged at the front end of the final pipe section 1.
Wherein, step S5 includes:
step S51, pushing the final pipe joint 1 forwards through each pushing device 2 to enable the final pipe joint 1 to be in primary compression joint with the immersed pipe section 4;
step S52, filling fluid into the first water-stop bag 13, so that a sealed cavity 15 is formed by a cavity between the first sealing door 11 and the second sealing door 42;
step S53, extracting accumulated water in the sealing cavity 15;
step S54, the final pipe joint 1 is pushed forward by each pushing device 2, and the first water stop bag 13 is crimped.
Specifically, in this embodiment, after step S41, before step S51, the method further includes:
s42, sinking a second immersed tube section towards 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 identical to that of the first immersed tube section, the second immersed tube section is temporarily not installed before the final tube joint is prefabricated, so that enough space is reserved in a foundation pit formed by a cofferdam for processing the final tube section, after the final tube section 1 is pulled into the expansion sleeve 31, the cofferdam 41 is removed, then the second immersed tube pipe fitting is submerged in place, and then the final pipe fitting 1 is connected with the rear end of the second immersed tube fitting, thereby facilitating construction.
It should be noted that, the second sealing door 42 is disposed in the second immersed tube fitting, after the cofferdam 41 is removed, the foundation pit will be filled with river water or lake water, after the final pipe joint 1 is initially crimped with the immersed tube section 4, the second sealing door 42 and the first sealing door 11 are completely filled with water, at this time, if the final tube fitting is pushed forward continuously, the accumulated water in the sealing cavity 15 cannot flow out, the accumulated water will wash out the first water-stop bag 13, so after the final pipe joint 1 is initially crimped with the immersed tube section 4, the accumulated water in the sealing cavity 15 is pumped out, and then the final pipe joint 1 is pushed forward by each pushing device 2 to crimp the first water-stop 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 shutter 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 expansion sleeve 31 is provided with a stop structure 311 protruding inwards, and the front end of the stop structure 311 and the rear end of the final pipe joint 1 are arranged in a front-rear opposite manner, and after step S5, the method includes:
step S6, grouting is conducted to 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:
step 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 immersed pipe section 4;
step S62, grouting 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 belt 8 on the inner side of the joint of the final pipe section 1 and the immersed pipe section 4. Specifically, the annular water stop 8 is an Ω water stop.
In summary, according to the final joint of the immersed tube tunnel, the control system controls the thrusters 2 to push the final tube segment 1 forwards, and adjusts the extension speed of each thruster 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 tube segment 1 is parallel to the rear end face of the immersed tube segment 4, and the left-right inclination of the final tube segment 1 when moving towards the outer side of the expansion sleeve 2 is avoided, and water seepage at the joint of the final tube segment and the immersed tube segment is prevented.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (10)
1. The immersed tube tunnel final joint is characterized by comprising a final tube segment (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 segment (3), the rear end of the final tube segment (1) can be inserted into the expansion sleeve (31) in a front-back sliding manner, the front end of the final tube segment (1) is positioned outside the expansion sleeve (31), the front end of the final tube segment (1) and a immersed tube segment (4) are arranged at intervals in front-back, a supporting beam (5) extending along the front-back direction is arranged below the intervals, and the upper end of the supporting beam (5) is in butt joint with the bottom wall of the final tube segment (1);
the rear end of the final pipe joint (1) is connected with the expansion 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 the thimbles of the two thimble type displacement meters (6) respectively elastically push against the left side wall of the supporting beam (5) and the right side wall of the supporting beam (5); the two thimble type displacement meters (6) and the pushing devices (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 variation 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 section (1) is parallel to the rear end face of the immersed pipe section (4).
2. The immersed tube tunnel final joint according to claim 1, wherein rolling elements are arranged at the end parts of the thimbles of the two thimbles of the displacement meter (6), and each rolling element is respectively abutted with the left side wall of the supporting beam (5) and the right side wall of the supporting beam (5).
3. The immersed tube tunnel final joint according to claim 1, wherein the cross section of the final tube segment (1) is square, a plurality of supporting beams (5) are arranged at intervals from left to right along the bottom wall of the final tube segment (1), and two thimble type displacement meters (6) are respectively arranged at the left side and the right side of one supporting beam (5).
4. A method of constructing a final joint for a immersed tube tunnel according to any one of claims 1 to 3, comprising the steps of:
step S1, arranging supporting beams (5) which are arranged at intervals in front of and behind an expansion sleeve (31) in front of the expansion sleeve (31);
s2, prefabricating a final pipe joint (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 thrusters (2) in the expansion sleeve (31), arranging two thimble-type displacement meters (6) on the bottom wall of the final pipe joint (1), and respectively propping the left side wall of the supporting beam (5) and the right side wall of the supporting beam (5) by the thimbles of the two thimble-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 immersed pipe section (4).
5. The method for constructing a final joint of a immersed tube tunnel according to claim 4, wherein the step S1 is preceded by:
s0, arranging a cofferdam (41) near the rear end of the submerged pipe section (4), and performing foundation construction in the cofferdam (41);
in the step S1, the lower end of the supporting beam (5) is buried in the foundation.
6. The construction method of the final joint of the immersed tube tunnel according to claim 5, wherein the front end of the final tube segment (1) is provided with a first sealing door (11), the final joint of the immersed tube tunnel comprises a telescopic water stop (12), the telescopic water stop (12) is sleeved on the outer peripheral side of the final tube segment (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 tube segment (1);
the inside second door (42) that seals that is equipped with of rear end of immersed tube section (4), the preceding terminal surface of final tube coupling (1) with it is cyclic annular first water-stop bag (13) of arranging to press from both sides between the rear end face of immersed tube section (4), include after step S4:
and S41, removing the cofferdam (41).
7. The method for constructing a final joint of a immersed tube tunnel according to claim 6, wherein the step S5 comprises:
step S51, pushing the final pipe joint (1) forwards through each pushing device (2) to enable the final pipe joint (1) to be in primary compression joint with the immersed pipe section (4);
step S52, filling fluid into the first water-stop bag (13) so that a sealed cavity (15) is formed by a cavity between the first sealing door (11) and the second sealing door (42);
s53, pumping out 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 stop bag (13).
8. The method according to claim 4, wherein in step S3, a power system is provided in the expansion sleeve (31) to pull the rear end of the final pipe section (1) into the expansion 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 expansion 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 segment (1) are arranged at intervals in a front-back opposite manner, and the step S5 comprises:
and S6, grouting a gap between the rear end of the final pipe joint (1) and the front end of the stop structure (311).
10. The method for constructing a final joint of a immersed tube tunnel according to claim 9, wherein the step S6 comprises:
step S61, arranging a connecting piece (7) in the final pipe section (1), wherein one end of the connecting piece (7) is detachably connected to the inner side wall of the final pipe section (1), and the other end of the connecting piece (7) is detachably connected to the inner side wall of the immersed pipe section (4);
step S62, grouting 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 belt (8) on the inner side of the joint of the final pipe section (1) and the immersed pipe section (4).
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| CN115538470B (en) * | 2022-12-05 | 2023-03-10 | 中交第一航务工程局有限公司 | Bidirectional pushing and pulling method for in-situ cast-in-place final joint of immersed tunnel |
| CN116164715B (en) * | 2022-12-21 | 2023-09-19 | 中交第一航务工程局有限公司 | Underwater posture rechecking method for push type final joint |
| CN115897641A (en) * | 2023-03-09 | 2023-04-04 | 中交第一航务工程局有限公司 | Jacking segment method final joint steel support locking device |
| CN116104132B (en) * | 2023-04-13 | 2023-06-23 | 西南石油大学 | Push-out prefabricated pipe joint suspension tunnel and butt joint construction method thereof |
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