CN112012242A - Push-out type final joint crimping method for immersed tube tunnel - Google Patents

Push-out type final joint crimping method for immersed tube tunnel Download PDF

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Publication number
CN112012242A
CN112012242A CN202010969052.5A CN202010969052A CN112012242A CN 112012242 A CN112012242 A CN 112012242A CN 202010969052 A CN202010969052 A CN 202010969052A CN 112012242 A CN112012242 A CN 112012242A
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China
Prior art keywords
prefabricated section
water
final
gap
final joint
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CN112012242B (en
Inventor
徐国平
黄清飞
刘明虎
秦辉辉
刘洪洲
姬海
王建平
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CCCC Highway Consultants Co Ltd
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CCCC Highway Consultants Co Ltd
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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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground
    • E02D19/02—Restraining of open water
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00—Production methods
    • E02D2250/0061—Production methods for working underwater
    • E02D2250/0092—Production methods for working underwater using hydraulical means
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2600/00—Miscellaneous
    • E02D2600/20—Miscellaneous comprising details of connection between elements
    • 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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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Lining And Supports For Tunnels (AREA)

Abstract

The invention relates to the technical field of immersed tube tunnel construction methods, in particular to a push-out type final joint crimping method for an immersed tube tunnel. The method comprises the following steps: floating and transporting the second prefabricated section to a position above a preset position in butt joint with the first prefabricated section on a construction site, wherein a final joint component is sleeved in one end, facing the first prefabricated section, of the second prefabricated section; sinking the second prefabricated section to a preset position, finally respectively packaging end-sealed doors at adjacent positions in the joint component and the second prefabricated section, and keeping a gap between the two end-sealed doors; water is injected into the gap to drive the final joint component out toward the first preform segment using water pressure within the gap until the final joint component extends from the second preform segment and abuts the first preform segment to construct a push-out final joint. The method is used for solving the defects of complex equipment system and high difficulty in installation control technology in the prior art.

Description

Push-out type final joint crimping method for immersed tube tunnel
Technical Field
The invention relates to the technical field of immersed tube tunnel construction methods, in particular to a push-out type final joint crimping method for an immersed tube tunnel.
Background
The immersed tube tunnel is an underwater tunnel constructed by using an immersed tube method. The immersed tube method is a short name of a prefabricated section sinking method and is a construction method for building a tunnel at the bottom of water. The common method for constructing the immersed tunnel by the immersed tube method is to transport a plurality of prefabricated sections to a water surface construction site in a floating mode respectively and to sink and install the prefabricated sections in a dredged underwater foundation trench one by one.
At present, in the existing immersed tube tunnel, each prefabricated section is usually butted from two ends to the middle of an immersed tube construction site in the construction process, and a final joint part is required to be arranged between two finally butted prefabricated sections so as to facilitate the smooth butt joint of the two prefabricated sections.
However, in the existing push-out type final joint crimping method for the immersed tube tunnel, the adopted final joint part is usually a solid concrete structure, and has the defects of heavy weight, difficulty in moving and hoisting and usually only being pushed by a jack. In the process of pushing the final joint component by using a jack to realize the final section crimping of the prefabricated section in the existing method, the defects of complex equipment system and high installation control technical difficulty exist, particularly, the water sealing requirements of an underwater jack system and an end sealing door adopted in the existing method are very high, so that the defect of high construction risk exists, and the underwater equipment needs to be disassembled after the final joint component is butted, so that the defects of high construction cost and long construction period exist.
Disclosure of Invention
Technical problem to be solved
The embodiment of the invention provides a push-out type final joint crimping method for a immersed tube tunnel, which is used for solving the defects of complex equipment system and high difficulty in installation control technology in the prior art.
(II) technical scheme
In order to solve the technical problem, the invention provides a push-out type final joint crimping method for a immersed tube tunnel, which comprises the following steps:
floating and transporting a second prefabricated section to a position above a preset position in butt joint with a first prefabricated section at a construction site, wherein a final joint component is sleeved in one end, facing the first prefabricated section, of the second prefabricated section;
sinking the second prefabricated section to a preset position, respectively packaging an end seal door in the final joint component and in the adjacent position in the second prefabricated section, and leaving a gap between the two end seal doors, wherein in the sinking process of the second prefabricated section, the water pressure in the gap and the water pressure outside the second prefabricated section are driven to be dynamically balanced;
injecting water into the gap to drive the final joint component out toward the first preform segment using water pressure within the gap until the final joint component extends from the second preform segment and abuts the first preform segment to construct a push-out final joint.
In some embodiments, the step of floating the second precast segment above the predetermined position of docking with the first precast segment further comprises:
and in the floating transportation process of the second prefabricated section, driving the water pressure in the gap to be dynamically balanced with the water pressure outside the second prefabricated section.
In some embodiments, the step of dynamically balancing the water pressure inside the gap with the water pressure outside the second prefabricated section during the floating of the second prefabricated section further comprises:
before the floating transportation process of the second prefabricated section, water is injected into the gap through a water injection well in advance, so that the water injection level in the gap is flush with the field water level outside the second prefabricated section in the floating transportation process of the second prefabricated section.
In some embodiments, the step of floating the second precast segment above the predetermined position of docking with the first precast segment further comprises:
during the floating transportation of the second prefabricated section, the outer wall of the final joint part is locked and fixed in the side wall of the second prefabricated section through a detachable locking piece.
In some embodiments, the step of sinking the second prefabricated section to a predetermined position and the step of dynamically balancing the water pressure inside the gap with the water pressure outside the second prefabricated section during the sinking of the second prefabricated section further comprise:
removing the retaining member between the final joint member and the second precast segment before the second precast segment is lowered;
and in the sinking process of the second prefabricated section, synchronously injecting water into the gap through a water injection well so as to enable the water level of the injected water in the gap to be dynamically flush with the field water level outside the second prefabricated section.
In some embodiments, the step of injecting water into the gap to drive the final joint component out toward the first preform segment using water pressure in the gap until the final joint component extends from the second preform segment and abuts the first preform segment further comprises:
continuously injecting water into the gap through a water injection well, wherein a water level height difference exists between a water injection level in the water injection well and a field water level outside the second prefabricated section, so that the water pressure for driving the final joint component to be pushed out towards the first prefabricated section is generated in the gap by the water level height difference.
In some embodiments, the step of injecting water into the gap to drive the final joint component out toward the first preform segment using water pressure in the gap until the final joint component extends from the second preform segment and abuts the first preform segment further comprises:
a water stopping assembly is connected between the extending end of the final joint component and the second prefabricated section, the water stopping assembly comprises a first water stopping piece, a second water stopping piece and a third water stopping piece, the first water stopping piece is telescopically connected between the outer wall of the final joint component and the inner wall of the second prefabricated section, the second water stopping piece is arranged on the end portion, facing the first prefabricated section, of the final joint component, and the third water stopping piece is movably connected between the outer wall of the final joint component and the inner wall of the second prefabricated section; and the final joint part is pushed out until the second water stop part is connected with the first prefabricated section so as to complete the butt joint of the final joint part and the first prefabricated section.
In some embodiments, the push-out type final joint comprises a second prefabricated section and a final joint component, a compartment structure is arranged in an inner cavity of the final joint component, a preset expansion end is arranged at one end, facing the first prefabricated section, of the second prefabricated section, and the final joint component is sleeved in the preset expansion end and can be pushed out towards the first prefabricated section; and one end sealing doors are respectively packaged in the final joint component and the second prefabricated section, a gap is formed between the two end sealing doors, and the gap is communicated to the position above the field water level outside the second prefabricated section through a water injection well.
In some embodiments, a water stop assembly is connected between the extended end of the final joint component and the second prefabricated section, the water stop assembly comprises a first water stop piece, a second water stop piece and a third water stop piece, the first water stop piece is telescopically connected between the outer wall of the final joint component and the inner wall of the second prefabricated section, the second water stop piece is arranged on the final joint component and faces to the end portion of the first prefabricated section, and the third water stop piece is movably connected between the outer wall of the final joint component and the inner wall of the second prefabricated section.
In some embodiments, the push-out type final joint further includes pre-buried sections and standard prefabricated sections, the pre-buried sections are respectively and coaxially pre-buried in two banks of the water area of the construction site, and two ends, away from each other, of the first prefabricated section and the second prefabricated section are respectively connected with the pre-buried sections of the two banks through at least one standard prefabricated section.
(III) advantageous effects
The technical scheme of the invention has the following beneficial effects:
in the push-out type final joint crimping method for the immersed tube tunnel, the second prefabricated section with the final joint component sleeved inside is transported to the position above the preset position in butt joint with the first prefabricated section in a floating mode, so that the transportation consumption of the prefabricated sections is reduced; sinking the second prefabricated section to a preset position, and driving the water pressure inside and outside a gap between two end seal doors in the final joint component and the second prefabricated section to keep dynamic balance in the sinking process of the second prefabricated section so as to ensure the dynamic balance of the prefabricated section during sinking and ensure that the second prefabricated section is accurately sunk to the preset position; and injecting water into the gap to drive the final joint component to be pushed out towards the first prefabricated section by using the water pressure in the gap until the final joint component extends out of the second prefabricated section and is in butt joint with the first prefabricated section, so that the weight of the final joint component is reduced by using the buoyancy of an empty bin in the second prefabricated section, the friction resistance when the final joint component is pushed out is reduced, and meanwhile, the underwater autonomous pushing-out and crimping of the final joint component are realized by using the pressure difference between the inside and the outside of the gap, so that the structure of the pushed-out final joint is finally realized. According to the method, a jack pushing and pulling system does not need to be separately added underwater, and the pushing of the final joint part can be realized only by injecting water into the gap; in addition, the method can realize accurate control of the push-out stroke and the push-out speed of the final joint part by controlling the water injection level, the water injection amount and the water injection speed, has ingenious conception, simple structure and simple and convenient operation, and greatly reduces the complexity of the system and the technical difficulty of installation and control.
Furthermore, the method can reduce or even avoid excessive underwater operation by realizing the underwater autonomous pushing and pressing of the final joint part, reduce the risk of the underwater operation and further properly reduce the requirement on the tightness of the end sealing door in the installation process of the immersed tube tunnel.
Furthermore, by realizing the underwater autonomous pushing and pressing of the final joint part, after the final joint part is pushed out and butted, additional equipment does not need to be disassembled, the construction cost is reduced, the construction period is effectively shortened, and the construction efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a push-out type final joint crimping method for a immersed tunnel according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view parallel to the end face of a final joint component of an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a final coupling member of an embodiment of the present invention taken along the length of a immersed tunnel;
fig. 4, 5 and 6 are schematic diagrams illustrating the working conditions of the push-out type final joint crimping method for the immersed tube tunnel according to the embodiment of the invention;
FIG. 7 is a current operating condition stress analysis diagram of the immersed tube tunnel push-out final splice crimping method of the embodiment of the invention shown in FIG. 5;
fig. 8, 9, 10, 11, 12, 13 and 14 are schematic views of various working conditions of the immersed tunnel construction by the immersed tunnel push-out type final joint crimping method according to the embodiment of the invention.
Reference numerals:
1: a first prefabricated section; 2: a second prefabricated section; 3: a first end seal door; 4: a second end seal door; 5: a third end sealing door; 6: a water injection well; 7: water injection level; 8: the field water level; 9: a base mat layer; 10: a standard prefabricated section; 11: fifth end seal door
100: a final fitting component; 110: a water stop assembly; 111: a first water stop; 112: a second water stop; 113: a third water stop; 120: a locking member;
210: presetting an expansion end; 220: a slideway; 230: a filling section;
300: pre-embedding a section; 310: retaining walls; 320: and a fourth end sealing door.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
This embodiment provides a push-out final splice crimping method (referred to simply as method in this embodiment) for a immersed tunnel, as shown in fig. 1, 4, 5 and 6. To perform the method, the present embodiment further proposes a push-out final joint (referred to simply as a structure in the present embodiment), which is shown in fig. 2 and 3. Further, the present embodiment also provides a sinking tunnel constructed by the method, which includes the push-out final joint of the present embodiment. The complete construction process of the sinking tunnel is shown in fig. 8 to 14.
Specifically, as shown in fig. 1, the method of this embodiment includes the following steps:
s1: floating and transporting the second prefabricated section 2 to a position above a preset position butted with the first prefabricated section 1 at a construction site, wherein a final joint part 100 is sleeved in one end, facing the first prefabricated section 1, of the second prefabricated section 2;
s2: sinking the second prefabricated section 2 to a preset position, finally respectively packaging end-sealed doors at adjacent positions in the joint component 100 and the second prefabricated section 2, and keeping a gap between the two end-sealed doors, wherein in the sinking process of the second prefabricated section 2, the water pressure in the gap is driven to be dynamically balanced with the water pressure outside the second prefabricated section 2;
s3: water is injected into the gap to drive the final joint component 100 out towards the first preform segment 1 using the water pressure in the gap until the final joint component 100 extends from the second preform segment 2 and abuts the first preform segment 1 to construct a push-out final joint.
It will be appreciated that the interior cavity of the final fitting component 100 of the present embodiment is provided with a compartment structure therein, as shown in fig. 2. Preferably, the interior of the tubular wall of the final fitting component 100 is divided into a plurality of compartments, preferably steel, to reduce the weight of the final fitting component 100 and to form a plurality of mutually separated cavities within the tubular wall of the final fitting component 100 to increase the buoyancy of the final fitting component 100.
The method described in this embodiment takes advantage of the buoyancy of the empty bin within the second prefabricated section 2 and the final joint component 100 to resist the weight of the final joint component 100, improving the safety of the float and sink process. According to the method, the water pressure in the gap and the water pressure outside the second prefabricated section 2 are dynamically balanced in the floating transportation process, so that the water pressure balance at two sides of the second end sealing door 4 in the second prefabricated section 2 is realized, the safety of the floating transportation and sinking processes is further improved, the final joint part 100 is prevented from falling off or being damaged, and the water tightness in the second prefabricated section 2 can be effectively improved. The method also enables the friction resistance during the final joint member 100 to be reduced by utilizing the stress change of the final joint member 100 during the pushing out of the final joint member 100, and simultaneously, the underwater autonomous pushing out and crimping of the final joint member 100 are realized by utilizing the pressure difference inside and outside the gap. In addition, the method drives the final joint part 100 to be pushed out under the water by changing the water pressure in the gap, and a jack pushing and pulling system does not need to be separately added under the water, so that the complexity of construction equipment is greatly reduced, and the construction period is shortened.
It will be appreciated that the two end seal doors on either side of the gap described in this embodiment are referred to as the second end seal door 4 mounted in the final fitting component 100 and the third end seal door 5 mounted in the second preform segment 2, respectively, as shown in fig. 3.
The adjacent positions in the final joint part 100 and the second prefabricated section 2 are respectively packaged with an end seal door, and a gap is left between the two end seal doors
In one embodiment, as shown in fig. 4, in the step of floating the second precast segment 2 above the predetermined position where it is butted against the first precast segment 1 in the above step S1, further comprising:
s110: during the floating transportation of the second prefabricated section 2, the water pressure in the driving gap is dynamically balanced with the water pressure outside the second prefabricated section 2.
In one embodiment, the step of dynamically balancing the water pressure inside the driving clearance with the water pressure outside the second precast segment 2 during the floating transportation of the second precast segment 2 in the step S110 further includes:
s111: before the floating transportation process of the second prefabricated section 2, water is injected into the gap through a water injection well 6 in advance, so that the water injection level 7 in the gap is flush with the field water level 8 outside the second prefabricated section 2 in the floating transportation process of the second prefabricated section 2.
According to the method, water is injected into the gap in advance, so that the water injection level 7 in the gap and the external field water level 8 are always kept flush in the floating transportation process of the second prefabricated section 2, the water pressure in the gap and the external water pressure are basically balanced, and the second prefabricated section is more stable and safer when being sunk.
It can be understood that the top of the water injection well 6 extends above the site water level 8, the bottom of the water injection well 6 is communicated with the gap, so that water is injected into the gap by the water injection well 6, and the water injection amount is changed as required, so that the water injection level 7 is ensured to stay in the gap as described in step S111, so that the water injection level 7 is flush with the site water level 8, and the pressure between the gap side and the outer side of the second end sealing door 4 is controlled to be substantially balanced. On the other hand, the water injection amount can be controlled according to the requirements in the subsequent sinking process and the butt joint process, so that the water injection level 7 is guaranteed to stay in the water injection well 6 and be flush with the site water level 8 or be higher than the site water level 8, the aim of changing the water pressure in the gap according to the actual requirements is achieved, namely the pressure difference between the gap side and the outer side of the second end sealing door 4 is changed, the dynamic balance of the inner pressure and the outer pressure of the second prefabricated section 2 in the sinking process is realized, and the final joint part 100 is accurately pushed out in the butt joint process.
It can be understood that the gap side of the second end seal door 4 refers to the end surface of the second end seal door 4 facing the gap, and the outer side of the gap side of the second end seal door 4 refers to the end surface of the second end seal door 4 facing away from the gap.
In one embodiment, the step of floating the second precast segment 2 above the predetermined position of the butt joint with the first precast segment 1 at the above step S1 further comprises:
s120: during the floating transport of second prefabricated section 2, the outer wall of the final joint part 100 is locked and fixed in the side wall of second prefabricated section 2 by means of a detachable locking member 120.
It can be understood that the locking member 120 is a detachable structure, so that the final joint member 100 is locked in the second prefabricated section 2 by the temporarily locked locking member 120 in the floating process in step S120, so that the final joint member 100 is always locked in the second prefabricated section 2 in the floating process of the second prefabricated section 2, and the final joint member 100 is prevented from falling off or being misplaced in the floating process, so as to improve the safety and accuracy of the subsequent sinking process and butting process.
It will be appreciated that retaining member 120 is preferably a removable retaining latch, with a locking aperture being preformed in the top of the pre-enlarged end 210 of second pre-fabricated section 2, and the retaining latch being inserted into the locking aperture and locked into the final fitting component 100.
In one embodiment, as shown in fig. 5, the step of sinking the second prefabricated section 2 to the predetermined position in the step of S2, and the step of dynamically balancing the water pressure inside the driving gap with the water pressure outside the second prefabricated section 2 during the sinking of the second prefabricated section 2 further comprise:
s210: removing retaining member 120 between final fitting member 100 and second prefabricated section 2 before second prefabricated section 2 is lowered;
s220: and in the sinking process of the second prefabricated section 2, synchronously injecting water into the gap through a water injection well 6 so as to enable the water injection level 7 in the gap to be dynamically flush with the field water level 8 outside the second prefabricated section 2.
In the method of this embodiment, before the second prefabricated section 2 is sunk, the locking member 120 is removed in advance to ensure that the sunk final joint member 100 is in a state of being capable of being moved under pressure, and in the sinking process, the dynamic balance of the water pressure inside and outside the gap is utilized to ensure that the final joint member 100 is not locked, but the gap side and the outer side of the second end sealing door 4 are in a dynamic pressure balance state, so that the final joint member 100 is not moved under any thrust.
It can be understood that, in order to ensure reliable water tightness in the second prefabricated section 2 during the sinking process of the second prefabricated section 2, the locking holes are welded and sealed preferably after the locking members 120 are removed.
It can be understood that the method of the present embodiment ensures that the water injection level 7 in the gap rises into the water injection well 6 along with the sinking of the second prefabricated section 2 during the sinking of the second prefabricated section 2 by injecting water into the water injection well 6, so as to promote the dynamic balance of water pressure inside and outside the gap.
In one embodiment, as shown in fig. 6, the step of injecting water into the gap in step S3 to drive the final joint member 100 to be pushed out toward the first preform segment 1 by using the water pressure in the gap until the final joint member 100 extends from the second preform segment 2 and is butted against the first preform segment 1 further includes:
s310: the gap is filled continuously with water through the water injection well 6, and there is a water level difference between the water injection level 7 inside the water injection well 6 and the site water level 8 outside the second prefabricated section 2, so that the water level difference is utilized to generate pressure inside the gap for driving the water pressure of the final joint part 100 out towards the first prefabricated section 1.
It will be understood that the arrows a and B shown in fig. 6 indicate the direction of water injection and the direction of water pressure experienced by the final coupling member.
In one embodiment, the step of injecting water into the gap to drive the final joint member 100 to be pushed out toward the first prefabricated section 1 by using the water pressure in the gap until the final joint member 100 extends from the second prefabricated section 2 and is butted against the first prefabricated section 1 in the step S3 further comprises:
s320: the final joint component 100 is pushed out to a second water stop 112 to connect with the first prefabricated section 1 to complete the butt joint of the final joint component 100 with the first prefabricated section 1.
It will be appreciated that the structure and connection of the second water stop 112 on the final fitting component 100 is described in detail in the following description of the construction of the push-out final fitting and will not be described again.
It can be understood that in the method of the present embodiment, after the final joint component 100 is pushed out, the volume of the gap between the second end seal door 4 and the third end seal door 5 is increased, so that the filling water level 7 in the filling well 6 is lowered, the water level difference between the filling water level 7 and the external field water level 8 is gradually reduced, until the thrust force applied to the final joint component 100 is reduced to the balance of the forces on the gap side and the outer side of the second end seal door 4, and the final joint component 100 stops moving. Then, water injection into the injection well 6 is continued, and finally the coupling member 100 is moved further and pushed out. When the final joint part is pushed out until the second water stop strip is fully and effectively contacted with the butt joint end of the first prefabricated section 1, the initial crimping between the second prefabricated section 2 and the first prefabricated section 1 is completed.
It can be understood that, in the process of pushing out the final joint member 100, since the amount of water injected into the gap determines the stroke of pushing out the final joint member 100 and the rate of water injection determines the speed of pushing out the final joint member 100, the stroke and the speed of pushing out the final joint member 100 can be controlled by controlling the amount and the rate of water injection as required by the operating conditions.
As shown in fig. 7, the force condition of the final fitting component 100 during the push-out process described above satisfies:
Fwater pressure resistance＝γWater (W)(G0-P0)A (1)
FSports water resistance＝0.5CρV2A (2)
FFrictional force＝μ(G0-P0) (3)
FHydraulic push＝γWater (W)(H+h+Δh) (4)
Wherein:
Fwater pressure resistanceThe pressure experienced by the final fitting component 100 in the direction opposite its direction of extrusion is in kN (kilonewtons);
Fhydraulic pushThe final tab portion 100 is subject to a push-out force in kN;
Fsports water resistanceThe resistance to the final tab portion 100 from the moving water in the direction opposite its direction of extrusion, in kN;
Ffrictional forceThe frictional force experienced by the final tab portion 100 in the direction opposite its direction of ejection is in kN;
γwater (W)Is the water gravity with the unit of kN/m3(kilonewtons per cubic meter);
h is the distance between the axis of the final joint component 100 and the ceiling of the final joint component 100 in m (meters);
h is the distance in m between the ceiling of the final fitting part 100 and the field water level 8 outside the second prefabricated section 2;
a is the force area in m of the cross section of the final joint part 1003；
C is the motion resistance coefficient of an object in liquid, and C is 2 in water;
rho is the density of water in kN/m3；
V is the speed of movement of the object in the liquid, i.e., the speed of propulsion of the final joint component 100 of this embodiment in water, in m/s (meters per second);
G0effective weight of the final joint component 100 in kN;
P0the buoyancy to which the final fitting member 100 is subjected is given in kN/m3；
μ is the coefficient of kinetic friction of the final joint component 100;
and delta h is the water head difference between the water injection level 7 and the field water level 8 and is expressed by m.
From the force analysis shown in fig. 7, and in conjunction with equations (1) through (4) above, it can be seen that the push-out process of the final joint component 100 within the second preform segment 2 includes the following six conditions:
the working condition I is as follows: at the second placeAfter the prefabricated section 2 is settled, the water level difference delta h between the inside and the outside of the water injection well 6 is 0, FSports water resistance＝0，FFrictional force＝0，FWater pressure resistance＝FHydraulic pushWhen the forces on the two sides of the final joint component 100 are balanced under the current working condition, the final joint component 100 is in a static state;
working conditions are as follows: begin to water injection so that water gets into in the clearance to water injection well 6, the pressure differential that water level difference in the clearance caused between water injection water level 7 and the scene water level 8 under the current operating mode does not overcome the biggest static frictional force that final joint part 100 received yet, then the both sides atress of final joint part 100 is balanced, satisfies: fHydraulic push＝FWater pressure resistance+FFrictional forceThen eventually the fitting component 100 remains in a rest state;
working conditions are as follows: water is continuously injected into the water injection well 6 until the pressure difference caused by the height difference of the water level between the injected water level 7 in the gap and the field water level 8 overcomes the maximum static friction force received by the final joint part 100, and then the final joint part 100 performs accelerated motion from zero speed, so that the following requirements are met: fHydraulic push＞FWater pressure resistance+FSports water resistance+FThe friction force is generated by the friction force,i.e., accelerated ejection of the final tab portion 100;
working conditions are as follows: to water injection well 6 internal water injection at the uniform velocity, then the speed of pushing out of final joint part 100 increases to resistance that final joint part 100 received water also increases gradually, and reachs new dynamic balance, satisfies: fHydraulic push＝FWater pressure resistance+FSports water resistance+FFrictional forceI.e., the final joint component 100 advances forward at a constant velocity;
working condition five: the filling of the well 6 is stopped, but as eventually the coupling member 100 is still pushed forward by inertia, the volume of the gap still increases and the filling level 7 in the well 6 drops, the pressure difference due to the level difference between the filling level 7 and the field level 8 decreases, whereupon FHydraulic pushGradually decrease until the final tab portion 100 ejection speed decreases to a standstill, thereby bringing the final tab portion 100 to a new dynamic equilibrium;
working condition six: when water is continuously injected into the water injection well 6 again, the final joint member 100 moves forward until the second water stop 112 comes into contact with the butt end of the first precast segment 1 and the joint reaction force is applied, and the final joint member 100 stops moving, thereby completing the initial press-fitting.
Understandably, F is described aboveHydraulic push＝FWater pressure resistance+FSports water resistance+FFrictional forceThat is to say: gamma rayWater (W)ΔhA＝FFrictional force+FCrimping。
Wherein, FCrimpingThe pressure required to compress the second water stop 112 to the water stop state is in kN.
Based on the stress analysis and the working condition analysis, a detailed engineering trial calculation test example is provided in the embodiment to show that the method described in the embodiment has implementability and meets the engineering mechanical requirements.
Specifically, the input parameters of the test example are: gamma rayWater (W)＝10kN/m3，H＝5.3m，h＝12.6m，A＝487.6㎡，C＝2，ρ＝1000kg/m3，V＝0.001m/s，G0＝1000kN，μ＝0.3。
The calculation result is as follows:
the working condition I is as follows: no calculation is required for the starting condition.
Working conditions are as follows: the calculated delta h is 0.062m, namely, the height difference of the water level between the water injection level 7 in the gap and the field water level 8 is 0.062m, so that the critical overcoming of the maximum static friction force of the final joint part 100 can be realized.
Working conditions are as follows: for the intermediate working condition, calculation is not needed, and the delta h is required to be more than 0.062 m.
Working conditions are as follows: when Δ h is calculated to be 0.062, that is, the difference in height between the water level 7 in the gap and the water level 8 at the site is 0.062m, the final joint member 100 can move forward at a constant speed of 0.001m/s (the movement speed is low, and the water resistance is low). Meanwhile, considering the pushing speed of 0.001m/s and the diameter of the water injection well 6 of 0.3m, taking four well bores as an example, calculating the water injection speed of a single well bore can obtain the water injection speed of the water injection well 6 which should reach 0.244m3/s。
Working condition five: no calculation is required.
Working condition six: initial pressure FCrimping5500kN, calculated Δ h is 1.2 m.
It can be seen that through the above six working conditions, the final joint component 100 can be pushed out, and the final joint component 100 can be accurately butted with the butted end of the first prefabricated section 1.
The present embodiment also contemplates a push-out final joint for performing the above method, which includes a second preform segment 2 and a final joint component 100, as shown in fig. 2 and 3. The second prefabricated section 2 is internally provided with a final joint part 100, and the second prefabricated section 2 is a prefabricated section which is finally sunk in the immersed tube tunnel construction process, and can be butted with the first prefabricated section 1 which is sunk in the immersed tube tunnel in advance by using the final joint part 100, so that the immersed tube tunnel construction is completed.
In this embodiment, a preset expanding end 210 is disposed at one end of the second prefabricated section 2 facing the first prefabricated section 1, and a radial distance of the preset expanding end 210 is greater than a radial distance of the second prefabricated section 2. Eventually the connector member 100 fits within the pre-enlargement 210 and can be pushed out or retracted towards the first prefabricated section 1. Adjacent positions in the final joint component 100 and in the second prefabricated section 2 are respectively enclosed with end-sealed doors, as shown in fig. 3, which are respectively a second end-sealed door 4 and a third end-sealed door 5. A gap is arranged between the two end sealing doors, the gap is communicated to the position above the field water level 8 outside the second prefabricated section 2 through a water injection well 6, water can be directly injected into the gap through injecting water into the water injection well 6, and therefore water pressure is generated at the second end sealing door 4 and the third end sealing door 5.
In order to improve the sealing performance (i.e. water tightness) of the underwater operation of the immersed tube tunnel, a water stop assembly 110 is connected between the extending end of the final joint part 100 and the second prefabricated section 2. As shown in fig. 2 and 3, the water stopping assembly 110 includes a first water stopping member 111, a second water stopping member 112, and a third water stopping member 113. The first water stop 111 is telescopically connected between the outer wall of the final joint member 100 and the inner wall of the second prefabricated section 2 so as to be capable of extending with the movement of the final joint member 100 to enlarge the sealing area when the final joint member 100 is pushed out from the second prefabricated section 2, and preferably, the first water stop 111 is an M-shaped water stop having certain extensibility and elasticity. The second water stop 112 is disposed on the final joint component 100 towards the end of the first prefabricated segment 1 so as to act as a sealing buffer between the final joint component 100 and the end of the first prefabricated segment 1 after the final joint component 100 is butted against the end of the first prefabricated segment 1, and preferably the second water stop 112 is a GINA water stop. A third water stop 113 is removably attached between the outer wall of the final joint assembly 100 and the inner wall of the second prefabricated section 2 to act as a seal between the gap between the second end seal door 4 and the third end seal door 5 and the exterior, the third water stop 113 preferably being a LIP water stop.
It will be appreciated that the second prefabricated section 2 is constructed as a closed empty silo pipe section structure, and in order to further improve the sealing performance of the second prefabricated section 2, the first water stop 111, the second water stop 112 and the third water stop 113 are preferably arranged continuously along the circumferential direction of the end face of the second prefabricated section 2, as shown in fig. 2.
It will be appreciated that in order to ensure smooth ejection of the final joint member 100, reduce friction, and improve the accuracy of the direction of ejection of the final joint member 100, it is preferable that the bottom of the inner wall of the second prefabricated section 2 is provided with a plurality of parallel slideways 220 arranged axially along the second prefabricated section 2, the bottom of the final joint member 100 is slidably embedded in each slideway 220, and the slideways 220 serve to accurately guide the ejection of the final joint member 100.
As shown in fig. 8 to 14, the present embodiment also proposes a sinking tunnel. The immersed tube tunnel is built by adopting the immersed tube tunnel push-out type final joint crimping method. The sinking tunnel includes the final joint components described above. Further, the immersed tube tunnel further comprises a pre-buried section 300 and a standard prefabricated section 10. The embedded sections 300 are embedded in the two banks of the water area of the construction site (such as a river) of the immersed tube tunnel, wherein the embedded sections 300 are respectively opposite, and the axes of the two embedded sections 300 are overlapped. The two ends of the first prefabricated section 1 and the second prefabricated section 2 which deviate from each other are respectively connected with the embedded sections 300 of the two banks through at least one standard prefabricated section 10.
In the construction process, the standard prefabricated sections 10 are butted one by one from two ends to the middle of a construction site respectively until an area for butting the first prefabricated section 1 and the second prefabricated section 2 is reserved between the two closest standard prefabricated sections 10; the standard prefabricated section 10 at one end of the area is then connected to the first prefabricated section 1, and the second prefabricated section 2 is connected to the standard prefabricated section at the other end of the area according to the method of the present embodiment, and the butt joint is achieved between the first prefabricated section 1 and the second prefabricated section 2 through the final joint component 100, so that a push-out final joint is constructed in the area, and thus the reliable construction of the immersed tunnel is achieved.
Specifically, the immersed tube tunnel described in this embodiment means that a tunnel pipe section is prefabricated into a plurality of pipe sections in segments, and specifically includes the embedded section 300, the first prefabricated section 1, the second prefabricated section 2, and the standard prefabricated section 10. It will be appreciated that the standard preform segment 10 has the same specification parameters as the first preform segment 1, and the standard preform segment 10 that is finally deposited before the second preform segment 2 is deposited can be used as the first preform segment 1.
The construction process of the immersed tube tunnel comprises the following steps: first, as shown in fig. 8, two embedded sections 300 are coaxially and oppositely embedded in two banks of a water area of a construction site, respectively, and retaining walls 310 are constructed on the tops of the two embedded sections 300, respectively, preferably, the retaining walls 310 are of a buttress structure, so as to increase the construction strength and reliability of two end portions of the immersed tube tunnel. Then, as shown in fig. 9 to 11, the standard prefabricated sections 10 are sequentially transported to the position above the preset position on the axis of the tunnel in a floating manner, the standard prefabricated sections 10 are sequentially sunk in the ground groove or the foundation groove dug in advance on the foundation mat 9 from two ends to the middle, and the underwater butt joint between each standard prefabricated section 10 and the embedded sections 300 on two banks and between two adjacent standard prefabricated sections 10 is completed by hydraulic pressure welding. Next, as shown in fig. 12 and 13, the end of one standard precast segment 10 of the two closest standard precast segments 10 in the middle of the immersed tunnel is sunk and butted against the first precast segment 1, and the end of the other standard precast segment 10 is sunk and butted against the second precast segment 2, with the preset enlarged end 210 of the second precast segment 2 facing the end of the first precast segment 1. The final fitting component 100 in the second preform segment 2 is pushed out and sealingly mated with the end of the first preform segment 1 by the above-described sunken tunnel push-out final fitting crimping method as shown in fig. 14, so that two standard preform segments 10 are mated by a push-out final fitting. Finally, removing each end sealing door, backfilling the foundation trench to protect each immersed tube section, and laying the internal facilities of the tunnel, thereby completing a complete underwater passage (i.e. immersed tube tunnel) on the underwater construction site.
It will be appreciated that the end of the second preform segment 2 remote from the final joint component 100 is the rear end, i.e. to the right as viewed in fig. 11 is the rear end of the second preform segment 2. In order to facilitate installation of the final joint part 100, the inner wall of the second prefabricated section 2 is configured into a stepped structure, and the enlarged end of the stepped structure is the preset enlarged end 210, after the final joint part 100 is pushed forwards and is abutted with the first prefabricated section 1 in the second prefabricated section 2, a blank area is formed between the rear end of the final joint part 100 and the inner wall of the stepped structure, the blank area is filled with a filler such as concrete to form a filling section 230 which is flush with the inner wall of the first prefabricated section 1, and a metal shell is welded on the surface of the filling section 230 facing the channel. The metal shell can protect the filling section 230, and the filling section 230 is flush with the empty bin inner wall of each prefabricated section, and the construction filling section 230 can ensure that the overall strength of the second prefabricated section 2 after the butt joint is completed is uniform, and can seal the communication space between the original gap and the water injection well 6, so as to improve the water tightness inside the immersed tube tunnel, and can play a role in pushing the pushed final joint part 100, and ensure that the final joint part 100 is always tightly connected to the end part of the first prefabricated section 1.
It can be understood that, in order to improve the sealing performance of each pipe section, a fourth end sealing door 320 is packaged at the end of the embedded section 300, first end sealing doors 3 are respectively packaged at two ends of the first prefabricated section 1, and fifth end sealing doors 11 are respectively packaged at two sides of each standard prefabricated section 10. The first end sealing door 3, the second end sealing door 4, the fourth end sealing door 320 and the fifth end sealing door 11 can adopt the same structure, and can be detached after the butt joint of all pipe sections is completed, so that a through pipeline structure is formed inside the immersed tunnel.
It can be understood that a second water stop 112 is connected to the circumference of the first end sealing door 3 enclosed at the two ends of the first prefabricated section 1 and the circumference of the fifth end sealing door 11 enclosed at the two ends of the standard prefabricated section 10, respectively, so as to enhance the water tightness of the pipe section butt joint position by using the second water stop 112.
It is to be understood that in the description of the present invention, "a plurality" means two or more unless otherwise specified. The terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and 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, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims (10)

1. A push-out type final joint crimping method for a immersed tube tunnel is characterized by comprising the following steps:
floating and transporting a second prefabricated section to a position above a preset position in butt joint with a first prefabricated section at a construction site, wherein a final joint component is sleeved in one end, facing the first prefabricated section, of the second prefabricated section;
sinking the second prefabricated section to a preset position, respectively packaging an end seal door in the final joint component and in the adjacent position in the second prefabricated section, and leaving a gap between the two end seal doors, wherein in the sinking process of the second prefabricated section, the water pressure in the gap and the water pressure outside the second prefabricated section are driven to be dynamically balanced;
injecting water into the gap to drive the final joint component out toward the first preform segment using water pressure within the gap until the final joint component extends from the second preform segment and abuts the first preform segment to construct a push-out final joint.
2. The immersed tunnel push-out final splice crimping method of claim 1, wherein said step of floating the second precast segment above a predetermined position of interfacing with the first precast segment further comprises:
and in the floating transportation process of the second prefabricated section, driving the water pressure in the gap to be dynamically balanced with the water pressure outside the second prefabricated section.
3. The push out final fitting crimping method of claim 2, wherein the step of dynamically balancing the water pressure within the gap with the water pressure outside the second precast segment during the floating of the second precast segment further comprises:
before the floating transportation process of the second prefabricated section, water is injected into the gap through a water injection well in advance, so that the water injection level in the gap is flush with the field water level outside the second prefabricated section in the floating transportation process of the second prefabricated section.
4. The immersed tunnel push-out final splice crimping method of claim 1, wherein said step of floating the second precast segment above a predetermined position of interfacing with the first precast segment further comprises:
during the floating transportation of the second prefabricated section, the outer wall of the final joint part is locked and fixed in the side wall of the second prefabricated section through a detachable locking piece.
5. The immersed tunnel push-out final splice crimping method according to claim 1, wherein said step of sinking said second precast segment to a predetermined position and said step of driving the water pressure within said gap to dynamically balance the water pressure outside said second precast segment during the sinking of said second precast segment further comprises:
removing the retaining member between the final joint member and the second precast segment before the second precast segment is lowered;
and in the sinking process of the second prefabricated section, synchronously injecting water into the gap through a water injection well so as to enable the water level of the injected water in the gap to be dynamically flush with the field water level outside the second prefabricated section.
6. The immersed tunnel push-out final fitting crimping method according to claim 1, wherein the step of injecting water into the gap to drive the final fitting component to push out toward the first prefabricated section using water pressure in the gap until the final fitting component protrudes from the second prefabricated section and abuts the first prefabricated section further comprises:
continuously injecting water into the gap through a water injection well, wherein a water level height difference exists between a water injection level in the water injection well and a field water level outside the second prefabricated section, so that the water pressure for driving the final joint component to be pushed out towards the first prefabricated section is generated in the gap by the water level height difference.
7. The immersed tunnel push-out final fitting crimping method according to claim 6, wherein the step of injecting water into the gap to drive the final fitting component to push out toward the first prefabricated section using water pressure in the gap until the final fitting component protrudes from the second prefabricated section and abuts the first prefabricated section further comprises:
a water stopping assembly is connected between the extending end of the final joint component and the second prefabricated section, the water stopping assembly comprises a first water stopping piece, a second water stopping piece and a third water stopping piece, the first water stopping piece is telescopically connected between the outer wall of the final joint component and the inner wall of the second prefabricated section, the second water stopping piece is arranged on the end portion, facing the first prefabricated section, of the final joint component, and the third water stopping piece is movably connected between the outer wall of the final joint component and the inner wall of the second prefabricated section; and the final joint part is pushed out until the second water stop part is connected with the first prefabricated section so as to complete the butt joint of the final joint part and the first prefabricated section.
8. The push-out final joint crimping method for the immersed tunnel according to any one of claims 1 to 7, wherein the push-out final joint comprises a second prefabricated section and a final joint component, a compartment structure is arranged in an inner cavity of the final joint component, a preset expanding end is arranged at one end, facing the first prefabricated section, of the second prefabricated section, and the final joint component is sleeved in the preset expanding end and can be pushed out towards the first prefabricated section; and one end sealing doors are respectively packaged in the final joint component and the second prefabricated section, a gap is formed between the two end sealing doors, and the gap is communicated to the position above the field water level outside the second prefabricated section through a water injection well.
9. The push-out final-splice crimping method for immersed tunnels according to claim 8, wherein a water-stop assembly is connected between the extended end of the final-splice component and the second prefabricated section, the water-stop assembly comprising a first water-stop member, a second water-stop member and a third water-stop member, the first water-stop member being telescopically connected between the outer wall of the final-splice component and the inner wall of the second prefabricated section, the second water-stop member being disposed on the final-splice component towards the end of the first prefabricated section, and the third water-stop member being movably connected between the outer wall of the final-splice component and the inner wall of the second prefabricated section.
10. The push-out type final joint crimping method for the immersed tunnel according to claim 8, wherein the push-out type final joint further comprises an embedded section and a standard prefabricated section, the embedded sections are respectively and coaxially embedded in two banks of the water area of the construction site, and two ends of the first prefabricated section and the second prefabricated section which are deviated from each other are respectively connected with the embedded sections of the two banks through at least one standard prefabricated section.
CN202010969052.5A 2020-05-07 2020-09-15 Push-out type final joint crimping method for immersed tube tunnel Active CN112012242B (en)

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CN106894449A (en) * 2017-02-09 2017-06-27 中铁隧道勘测设计院有限公司 A kind of structure type of immersed tube tunnel final joint
CN107208392A (en) * 2015-01-27 2017-09-26 法国国家电力企业 Water storage pool equipment
CN108385728A (en) * 2018-05-10 2018-08-10 中交第航务工程局有限公司 Immersed tube tunnel push mode FS final spice and its docking construction method
CN207829014U (en) * 2018-01-29 2018-09-07 中交第一航务工程局有限公司 Immersed tube tunnel final connector

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107208392A (en) * 2015-01-27 2017-09-26 法国国家电力企业 Water storage pool equipment
CN106894449A (en) * 2017-02-09 2017-06-27 中铁隧道勘测设计院有限公司 A kind of structure type of immersed tube tunnel final joint
CN207829014U (en) * 2018-01-29 2018-09-07 中交第一航务工程局有限公司 Immersed tube tunnel final connector
CN108385728A (en) * 2018-05-10 2018-08-10 中交第航务工程局有限公司 Immersed tube tunnel push mode FS final spice and its docking construction method

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