Water-near-depth supporting and retaining system for dock entrance of immersed tunnel dry dock and construction method of water-near-depth supporting and retaining system

Abstract

The invention relates to the technical field of tunnel construction, in particular to a near-water-depth supporting and retaining system for an immersed tunnel dry dock entrance and a construction method thereof.The near-water-depth supporting and retaining system comprises a dock gate, two L-shaped docking blocks, a dock ridge, a dock gate bottom plate and a water stop belt, first right-angle faces of the two docking blocks are oppositely arranged, second right-angle faces of the two docking blocks both face the near-shore side, and the dock ridge is arranged on the dock gate bottom plate; the dock bank is arranged between the bottoms of the two docking blocks, the dock bank and the two docking blocks form a concave combination surface, the dock gate bottom plate is arranged between the two docking blocks and located at the top of the shore-adjacent side of the dock bank, the dock gate bottom plate is provided with a spherical base and a thrust device, and the dock gate is arranged between the dock bank and the two docking blocks and located at the top of the dock gate bottom plate. The back-to-shore side of the dock gate is attached to the concave combination face, the waterstop is arranged between the back-to-shore side of the dock gate and the concave combination face, water flow impact force borne by the left side and the right side of the dock gate can be reduced, damage of water flow to the waterstop is reduced, and the service life of the waterstop is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, in particular to a water-deep retaining system for a dry dock entrance of an immersed tube tunnel and a construction method thereof. Background Art

[0002] A dry dock is a large foundation pit used for casting pipe sections of immersed tube tunnels, and is generally built near the shore. When casting prefabricated pipe sections, the dock opening needs to be closed and the water in the dock needs to be drained. When the pipe sections are cast and need to be floated out of the dock, the dock opening support system is opened or removed to connect the waters inside and outside the dock. The traditional dock opening cofferdam support system includes cofferdam structure, caisson structure and watertight gates, etc. There are problems such as large demolition and reconstruction work, heavy caisson structure that is difficult to install and dismantle, and complex and uneconomical design and construction of watertight gates. At present, due to the shortage of urban land, the scale of dry dock construction is limited, and it is impossible to cast multiple pipe sections at one time and then float them. As a result, the pipe sections of immersed tube tunnels need to be prefabricated and undocking in multiple batches, that is, the dry dock opening needs to be opened and closed repeatedly. The traditional dock opening cofferdam support system can no longer meet the needs of multiple prefabrication and floating of immersed tube sections.

[0003] In order to meet the current construction needs of immersed tube tunnels, a new dock support system has been developed in the industry, which includes dock piers, dock sills and dock gates. Usually, two dock piers are arranged opposite to each other, and the dock sills are connected between the bottoms of the two dock sills. The dock gates are arranged between the dock sills and the two dock piers. When the pipe sections need to be prefabricated, the dock gates are closed, and when the pipe sections need to be floated, the dock gates are opened. This type of dock support system has the advantages of easy installation, repeated opening and reuse, which can meet the requirements of multiple uses of dry docks and realize the prefabrication and floating of multiple batches of immersed tube sections. And compared with the traditional dock cofferdam support system, the new dock support system needs to pay more attention to water stopping to prevent the river water outside the dock from seeping into the dry dock through the gaps between the dock gates and the dock piers and dock sills.

[0004] For example, in the prior art, a Chinese patent with publication number CN214832805U proposes a dock water-stop structure, including dock piers, dock sills and dock doors, wherein the dock piers and dock sills are provided with water-stop structures that match the dock doors, and the water-stop structures include embedded steel plates and water-stop strips, the embedded steel plates are provided on the dock piers and dock sills, the water-stop strips are installed on the embedded steel plates through fasteners, the water-stop strips extend along the edge of the dock, and the dock piers and dock sills are provided with limit blocks on one or both sides of the water-stop strips. The dock and dock water-stop structure such as the above-mentioned dock not only realizes the prefabrication and floating of multiple batches of immersed tubes, but also improves the water-stop performance of the dock. The dock gate of this type of dock support system needs to be towed or pushed by a tugboat when opening and closing. Therefore, in order to reduce the difficulty of opening and closing the dock gate, the dock gate of this type of dock support system is usually exposed outside the relative space of the two dock piers, so that when opening and closing the dock gate, the tugboat can not only be on the outside of the dock gate, but also on the left and right sides of the dock gate to drag or push the dock gate. However, this also brings other shortcomings: first, the left or right side of the dock gate bears more impact force of the water flow, resulting in defects in the position and structural stability of the dock gate; secondly, the distance between the waterstop and the outer water flow is short, and the short gap easily leads to a high water flow speed reaching the waterstop, concentrated water flow and insufficient water flow self-purification effect, which ultimately increases the damage to the waterstop and reduces the effective service life of the waterstop. Summary of the invention

[0005] In order to reduce the impact force of water flow on the left or right side of the dock gate, reduce the damage caused by water flow to the waterstop, and extend the service life of the waterstop, the present application provides a deep water support system for the dry dock of an immersed tube tunnel and a construction method thereof.

[0006] In a first aspect, the present invention provides a water-deep retaining system for a dry dock of an immersed tube tunnel, which adopts the following technical solution:

[0007] A water-deep support system for a dry dock of an immersed tube tunnel comprises a dock gate, two L-shaped dock piers, a dock sill, a dock gate bottom plate and a water stop. The dock piers comprise a first right-angled surface and a second right-angled surface. The first right-angled surfaces of the two dock piers are arranged opposite to each other, and the second right-angled surfaces of the two dock piers are both facing the shore side. The dock sill is arranged between the bottoms of the two dock piers, and one side of the shore side of the dock sill is coplanar with the second right-angled surfaces of the two dock piers and forms a concave combination surface. The dock gate bottom plate is arranged between the two dock piers, the dock gate bottom plate is located at the top of the shore side of the dock sill, and the dock gate bottom plate is provided with a spherical base and a thrust device. The dock gate is arranged between the dock sill and the two dock piers and at the top of the dock gate bottom plate, and the back-to-shore side of the dock gate is attached to the concave combination surface formed by the dock piers and the dock sill. The water stop is arranged on the back-to-shore side of the dock gate and between the concave combination surface formed by the dock piers and the dock sill.

[0008] Preferably, the dock gate is composed of a steel box structure, the interior of the dock gate is divided into a plurality of interconnected compartments by steel beams, the dock gate is controlled to sink when the compartments are filled with water, and is controlled to float when the compartments are drained, and a plurality of drainage holes are provided on the shore side and the back shore side of the dock gate; the width L of the dock gate is 3 to 5 m larger than the width of the immersed tube section, the height of the dock gate is 3 to 5 m higher than the height of the immersed tube section, the thickness of the dock gate is half of the height of the dock gate, and the dock gate is poured with concrete or sand within a height range of 1 / 4 to 1 / 3 from the bottom surface.

[0009] Preferably, the dock pier is composed of a lattice-type underground continuous wall, and the dock sill is composed of a T-shaped underground continuous wall. The parts of the dock pier and the dock sill above the bottom plate of the dock gate directly bear the water pressure transmitted by the dock gate, and the parts of the dock pier and the dock sill below the bottom plate of the dock gate are embedded sections.

[0010] Preferably, the foundation of the dock gate bottom plate is a cast-in-place pile foundation, a first baffle is provided on the shore side of the top of the dock gate bottom plate, a second baffle is provided on the side of the dock gate bottom plate facing the two dock piers respectively, a concave positioning structure is formed between the first baffle and the two second baffles, a plurality of spherical bases are provided on the top of the dock gate bottom plate, rolling steel balls are installed on the spherical bases, and a plurality of thrust devices are provided on the inner side of the concave positioning structure.

[0011] Preferably, a concave installation groove is provided on the concave combination surface between the dock pier and the dock sill, and the water stop strip is embedded in the installation groove.

[0012] Preferably, a mooring post is provided at each of the four corner points on the top of the dock door, and the mooring post is used to connect to a winch around the dry dock foundation pit via a cable.

[0013] Preferably, two water pumps are installed on the top of the dock gate, one water pump is used to inject water into the dock gate, and the other water pump is used to discharge water outside the dock gate. Water level gauges are provided on the shore side of the dock gate and inside the cabin.

[0014] Preferably, when the dock door is closed, the water level H in the dock door chamber (11) is H=F S (H W +C S v 2 / (2g))-H S , where H w is the water level on the river side of the dock gate (1); v is the water velocity; g is the gravitational acceleration; C S is the adjustment coefficient, Fs is the anti-floating coefficient, H S It is the draft depth of the dock door (1) before water is added.

[0015] In a second aspect, the present invention provides a construction method for a water-deep retaining system for a dry dock of an immersed tube tunnel, which adopts the following technical solution:

[0016] A construction method of a water-deep retaining system for a dry dock of an immersed tube tunnel comprises the following steps:

[0017] S1: Dock construction;

[0018] S2: Excavation of dry dock foundation pit;

[0019] S3: Dock construction;

[0020] S4: Installation of waterstop strips on the shore side of dock piers and dock sills;

[0021] S5: The dock door is floated into place;

[0022] S6: The dock gate is flooded and sinks;

[0023] S7: Open the dock door bottom plate thrust device and adjust the dock door position.

[0024] The beneficial effects of the present invention are:

[0025] 1. The connection between the dock pier and the dock gate is designed to be concave, and the dock gate is embedded in the relative space between the two dock piers, which can reduce the volume of the dock gate exposed outside the two dock piers. This not only reduces the water area occupied by the dock gate, but also reduces the impact of water flow on both sides of the dock gate, and improves the position and structural stability of the dock gate;

[0026] 2. Compared with the existing technology, the distance between the water stop and the outer water flow is longer. The long gap can slow down the water flow speed reaching the water stop and reduce the impact force on the water stop. The long gap can also disperse the water flow to a certain extent before reaching the water stop, thereby reducing the pressure caused by the concentration of water flow. In addition, the long gap can make the water flow easier to self-purify, reduce the impact of sediments or impurities on the water stop, and ultimately reduce the damage caused by the water flow to the water stop and extend the service life of the water stop.

[0027] 3. When the dock door is closed, the winches on both sides of the shore first drag the steel dock door to the space between the two dock piers through cables, then water is poured into the steel dock door to make it sink to the bottom plate of the dock door, and finally the thrust device on the bottom plate of the dock door fine-tunes the position of the dock door. The dock door support system cooperates with the long-distance dragging of the winch and the close-range fine-tuning of the thrust device, which not only achieves the precise docking of the dock door and the dock pier, but also can cope with the scene where it is inconvenient to use tugboats for adjustment, thus improving the applicability of the dock door support system;

[0028] 4. Automatic water level monitoring devices are installed inside and outside the dock gate, and two water pumps are installed on the top of the dock gate. According to the changes in the water level of the river outside the dock and the water flow speed, the water level in the dock gate cabin can be automatically adjusted, the pressure of the spherical base can be controlled within a reasonable range, and the service life of the spherical base can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the support system in the embodiment of the present application;

[0030] Figure 2 is a side view of the retaining system in the embodiment of the present application;

[0031] Figure 3 It is a structural schematic diagram of the dock door in an embodiment of the present application;

[0032] Figure 4 It is a schematic diagram of the structure of the dock door bottom plate in an embodiment of the present application.

[0033] Explanation of the reference numerals: 1. dock door; 11. cabin; 12. drainage hole; 13. mooring post; 2. dock pier; 3. dock sill; 4. dock door bottom plate; 41. concave positioning structure; 42. spherical base; 43. thrust device; 5. water stop. DETAILED DESCRIPTION

[0034] The following will be combined with the attached Figure 1 -Attached Figure 4 The present invention is further illustrated by the following embodiments.

[0035] This embodiment discloses a water-deep support system for a dry dock entrance of an immersed tube tunnel.

[0036] Reference Figures 1 to 4 The water-deep support system for the entrance of the immersed tube tunnel dry dock includes a dock gate 1, a dock pier 2, a dock sill 3, a dock gate bottom plate 4 and a water stop 5.

[0037] Reference Figure 1 and Figure 2 There are two dock piers 2, both of which are L-shaped. The two dock piers 2 are located between the river bank and the dry dock, and the two dock piers 2 are mirror-imaged. Since the dock pier 2 is L-shaped, the dock pier 2 has two right-angled surfaces, namely a first right-angled surface and a second right-angled surface. The first right-angled surface is longer and the second right-angled surface is shorter. In this embodiment, the side of the dock pier 2 facing the river bank is the bank side, and the side of the dock pier 2 facing the dry dock is the back bank side. The first right-angled surfaces of the two dock piers 2 are arranged opposite to each other, and the second right-angled surfaces of the two dock piers 2 are both facing the bank side.

[0038] Reference Figure 1The dock sill 3 is arranged between the bottoms of the two dock piers 2, and one side of the dock sill 3 facing the shore is coplanar with the second right-angled surfaces of the two dock piers 2, so that a concave combined surface is formed between one side of the dock sill 3 facing the shore and the second right-angled surfaces of the two dock piers 2.

[0039] Reference Figures 1 to 4 The dock door bottom plate 4 is arranged between the two dock piers 2, and the dock door bottom plate 4 is located at the top of the shore side of the dock sill 3. Specifically, the shore side of the top of the dock door bottom plate 4 is provided with a first baffle, and the sides of the dock door bottom plate 4 facing the two dock piers 2 are provided with second baffles, and a concave positioning structure 41 is formed between the first baffle and the two second baffles. Further, a plurality of spherical bases 42 are arranged on the top of the dock door bottom plate 4, and rolling steel balls are installed on the spherical bases 42, and a thrust device 43 is arranged on the inner side of the concave positioning structure 41 composed of the first baffle and the two second baffles.

[0040] Reference Figures 1 to 4 The dock gate 1 is arranged between the dock sill 3 and the two dock piers 2. Specifically, when the dock gate 1 is closed, the dock gate 1 is located on the top of the dock gate bottom plate 4, and the back-shore side of the dock gate 1 is attached to the concave combination surface composed of the dock piers 2 and the dock sill 3. Furthermore, the water stop 5 is arranged between the back-shore side of the dock gate 1 and the concave combination surface composed of the dock piers 2 and the dock sill 3. When the dock gate 1 is closed, the water pressure acting on the dock gate 1 is transmitted to the foundation through the dock piers 2 on both sides and the bottom dock sill 3. At the same time, the water pressure is used to compress the water stop 5 arranged between the dock gate 1, the dock piers 2 and the dock sill 3, so that the dock gate 1 is sealed and watertight.

[0041] Through the above-mentioned arrangement, firstly, since the dock gate 1 is embedded in the relative space between the two dock piers 2, the volume of the dock gate 1 exposed outside the two dock piers 2 can be reduced, and finally the water flow impact force on the left or right side of the dock gate 1 is reduced, thereby improving the position and structural stability of the dock gate 1; secondly, compared with the prior art, the distance between the waterstop 5 and the outer water flow is longer, and the long gap can slow down the water flow speed reaching the waterstop 5 and reduce the impact force on the waterstop 5. The long gap can also disperse the water flow to a certain extent before reaching the waterstop 5, thereby reducing the pressure caused by the concentration of the water flow, and the long gap can make the water flow easier to self-purify, reduce the influence of sediments or impurities on the waterstop 5, and finally reduce the damage caused by the water flow to the waterstop 5 and extend the service life of the waterstop 5. It should be noted that, in the present solution, although the dock gate 1 is embedded in the relative space between the two dock piers 2, making it difficult for the tugboat to drag or push it on the left and right sides of the dock gate 1, the provision of the dock gate bottom plate 4 can assist the tugboat in opening and closing the dock gate 1, thereby reducing the difficulty of opening and closing the dock gate 1.

[0042] Reference Figures 1 to 4The dock gate 1 is composed of a steel box structure. The interior of the dock gate 1 is divided into a plurality of interconnected cabins 11 by steel beams. The plurality of interconnected cabins 11 are distributed in multiple rows and columns. When the cabins 11 are filled with water, the dock gate 1 is controlled to sink. When the cabins 11 are drained, the dock gate 1 is controlled to float. A plurality of drainage holes 12 are provided on the shore side and the back shore side of the dock gate 1, which are convenient for pouring water into the dock gate 1 when installing the dock gate 1, and for pouring water into the dry dock when the pipe section is floated. A mooring post 13 is provided at each of the four corner points on the top of the dock gate 1. The mooring post 13 is used to connect with the winch around the dry dock foundation pit through a cable. When the dock gate 1 is opened and closed, the winch assists in adjusting the position of the dock gate 1 through the cable and the mooring post 13. By using the winch and the dock gate bottom plate 4 to jointly adjust the position of the dock gate 1, the retaining system can also cope with the scene where it is inconvenient to use a tugboat for adjustment, thereby improving the applicability of the retaining system. The cabin 11 at the bottom of the dock door is poured with concrete or sand, which increases the deadweight of the dock door 1 and moves the center of gravity of the dock door 1 downward, thereby enhancing the stability of the dock door 1 during the floating and sinking process. In this embodiment, the width L of the dock door 1 is 3 to 5 meters larger than the width of the immersed tube section, the height of the dock door 1 is 3 to 5 meters higher than the height of the immersed tube section, the thickness of the dock door 1 is half of the height of the dock door 1, the dock door 1 is poured with concrete or sand within the range of 1 / 4 to 1 / 3 of the height from the bottom surface, and at least 4 / 5 of the thickness of the dock door 1 is embedded in the relative space between the two dock piers 2.

[0043] Reference Figure 1 and Figure 2 The dock pier 2 is composed of a lattice underground continuous wall, and the dock sill 3 is composed of a T-shaped underground continuous wall. The parts of the dock pier 2 and the dock sill 3 above the dock door bottom plate 4 directly bear the water pressure from the dock door 1, and the parts of the dock pier 2 and the dock sill 3 below the dock door bottom plate 4 are embedded sections to ensure that the stability and bearing capacity requirements of the dock pier 2 and the dock sill 3 are met. The foundation of the dock door bottom plate 4 is a cast-in-place pile foundation, and the thrust device 43 of the dock door bottom plate 4 is a hydraulic cylinder. In this embodiment, the number of thrust devices 43 of the first baffle is the sum of the number of thrust devices 43 of the other two second baffles. In addition, a concave installation groove is provided on the concave combination surface between the dock pier 2 and the dock sill 3, and the water stop 5 is embedded in the installation groove. The thickness of the water stop 5 is greater than the depth of the installation groove, so that when the dock door 1 is close to the concave combination surface of the dock pier 2 and the dock sill 3, the water stop 5 will be compressed by force, thereby achieving a water stop effect.

[0044] This embodiment also discloses a construction method of a water-deep retaining system for a dry dock entrance of an immersed tube tunnel.

[0045] The construction method of the water-deep retaining system for the dry dock of the immersed tube tunnel includes the following steps:

[0046] S1: Construction of lattice underground continuous wall of dock 2;

[0047] S2: Excavation of dry dock foundation pit;

[0048] S3: Construction of underground continuous wall of dock 3;

[0049] S4: Installation of water stop strip 5 on the shore side of dock pier 2 and dock sill 3;

[0050] S5: Dock door 1 is hinged, moved and floated into place;

[0051] S6: Dock gate 1 is filled with water and sinks;

[0052] S7: Open the thrust device 43 of the dock door bottom plate 4 and adjust the position of the dock door 1.

[0053] Furthermore, two water pumps are installed on the top of the dock gate 1, one water pump is used to inject water into the dock gate 1, and the other water pump is used to discharge water outside the dock gate 1. Water level gauges are installed at the same height on the river side of the dock gate 1 and inside the cabin 11.

[0054] When the dock door 1 is closed, the water level in the dock door compartment 11 is H = F S (H W +C S v 2 / (2g))-H S , where H w is the water level on the river side of dock gate 1; v is the water velocity; g is the gravitational acceleration; C S is the adjustment coefficient, Fs is the anti-floating coefficient, H S It is the draft depth of dock gate 1 before water is added.

[0055] Based on the above settings, the two water pumps can automatically adjust the water level in the dock door cabin according to the changes in the river water level outside the dock and the water flow rate, control the pressure of the spherical base within a reasonable range, and increase the service life of the spherical base.

[0056] The above are all preferred embodiments of the present invention, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A water-deep retaining system for a dry dock of an immersed tube tunnel, characterized in that: The invention comprises a dock door (1), two L-shaped dock piers (2), a dock sill (3), a dock door bottom plate (4) and a water stop (5), wherein the dock piers (2) comprise a first right-angled surface and a second right-angled surface, the first right-angled surfaces of the two dock piers (2) are arranged opposite to each other, and the second right-angled surfaces of the two dock piers (2) are both facing the shore side; the dock sill (3) is arranged between the bottoms of the two dock piers (2), and one side of the shore side of the dock sill (3) is coplanar with the second right-angled surfaces of the two dock piers (2) to form a concave combined surface; the dock door bottom plate (4) is arranged between the two dock piers (2 ), the dock door bottom plate (4) is located at the top of the shore side of the dock sill (3), and the dock door bottom plate (4) is provided with a spherical base and a thrust device (43); the dock door (1) is arranged between the dock sill (3) and the two dock piers (2) and at the top of the dock door bottom plate (4), and the back-to-shore side of the dock door (1) is attached to the concave combined surface formed by the dock piers (2) and the dock sill (3); the water stop (5) is arranged between the back-to-shore side of the dock door (1) and the concave combined surface formed by the dock piers (2) and the dock sill (3).

2. The deep water retaining system for the dry dock of an immersed tube tunnel according to claim 1, characterized in that: The dock gate (1) is composed of a steel box structure. The interior of the dock gate (1) is divided into a plurality of interconnected chambers (11) by steel beams. When the chambers (11) are filled with water, the dock gate (1) is controlled to sink. When the chambers (11) are drained, the dock gate (1) is controlled to float. A plurality of drainage holes (12) are provided on both the shore side and the back shore side of the dock gate (1). The width L of the dock gate (1) is 3 to 5 meters greater than the width of the immersed tube section. The height of the dock gate (1) is 3 to 5 meters higher than the height of the immersed tube section. The thickness of the dock gate (1) is half the height of the dock gate (1). The dock gate (1) is poured with concrete or sand within a height range of 1 / 4 to 1 / 3 from the bottom surface.

3. The deep water support system for the dry dock of an immersed tube tunnel according to claim 1, characterized in that: The dock pier (2) is composed of a lattice-type underground continuous wall, and the dock sill (3) is composed of a T-shaped underground continuous wall. The parts of the dock pier (2) and the dock sill (3) above the dock door bottom plate (4) directly bear the water pressure transmitted from the dock door (1), and the parts of the dock pier (2) and the dock sill (3) below the dock door bottom plate (4) are embedded sections.

4. The deep water support system for the dry dock of an immersed tube tunnel according to claim 1, characterized in that: The foundation of the dock door bottom plate (4) is a cast-in-place pile foundation. A first baffle is arranged on the shore side of the top of the dock door bottom plate (4). A second baffle is arranged on the side of the dock door bottom plate (4) facing the two dock piers (2). A concave positioning structure (41) is formed between the first baffle and the two second baffles. A plurality of spherical bases (42) are arranged on the top of the dock door bottom plate (4). Rolling steel balls are mounted on the spherical bases (42). A plurality of thrust stop devices (43) are arranged on the inner side of the concave positioning structure (41).

5. The deep water support system for the dry dock of an immersed tube tunnel according to claim 1, characterized in that: A concave installation groove is provided on the concave combination surface between the dock pier (2) and the dock sill (3), and the water stop strip (5) is embedded in the installation groove.

6. The deep water support system for the dry dock of an immersed tube tunnel according to claim 1, characterized in that: A mooring post (13) is provided at each of the four corner points on the top of the dock door (1), and the mooring post (13) is used to connect to a winch around the dry dock foundation pit via a cable.

7. The deep water support system for the immersed tube tunnel dry dock according to claim 2, characterized in that: Two water pumps are installed on the top of the dock gate (1), one of the water pumps is used to inject water into the dock gate (1), and the other water pump is used to discharge water outside the dock gate (1). Water level gauges are installed at the same height on the shore side of the dock gate (1) and inside the cabin (11).

8. The deep water support system for the dry dock of an immersed tube tunnel according to claim 2, characterized in that: When the dock door (1) is in a closed state, the water level H in the dock door chamber (11) is equal to F. S (H W +C S v 2 / (2g))-H S , where H w is the water level on the river side of the dock gate (1); v is the water velocity; g is the gravitational acceleration; C S is the adjustment coefficient, Fs is the anti-floating coefficient, H S It is the draft depth of the dock door (1) before water is added.

9. A construction method for a water-deep retaining system for a dry dock of an immersed tube tunnel, used for constructing the water-deep retaining system for a dry dock of an immersed tube tunnel as claimed in any one of claims 1 to 8, characterized in that: S1: Construction of dock pier (2); S2: Excavation of dry dock foundation pit; S3: Construction of dock (3); S4: Installation of water stop strips (5) on the shore side of dock piers (2) and dock sills (3); S5: The dock door (1) is floated into place; S6: The dock gate (1) is filled with water and sinks; S7: Open the thrust device (43) of the dock door bottom plate (4) and adjust the position of the dock door (1).

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