A temporary deep-water retaining system for the dry dock entrance of a immersed tube tunnel and its construction method

Abstract

The present invention relates to the technical field of tunnel construction. More specifically, it relates to a temporary deep-water retaining system for the dry dock entrance of a immersed tube tunnel and its construction method, which includes a dock gate, two L-shaped dock piers, a dock sill, a dock gate bottom plate and a water stop belt. 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 the dock sill and the two dock piers form a concave combined surface. The dock gate bottom plate is arranged between the two dock piers and at the top of the shore side of the dock sill. 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 on the top of the dock gate bottom plate. The back-shore side of the dock gate is attached to the concave combined surface. The water stop belt is arranged between the back-shore side of the dock gate and the concave combined surface. The present invention can reduce the water flow impact force on the left and right sides of the dock gate, and reduce the damage caused by the water flow to the water stop belt, and extend the service life of the water stop belt.

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 the publication number CN214832805U proposed a dock entrance water stop structure, including a dock pier, a dock sill, and a dock gate. Among them, the dock pier and the dock sill are provided with a water stop structure that cooperates with the dock gate. The water stop structure includes a pre-embedded steel plate and a water stop belt. The pre-embedded steel plate is arranged on the dock pier and the dock sill, and the water stop belt is installed on the pre-embedded steel plate through fasteners. The water stop belt extends along the edge of the dock entrance, and the dock pier and the dock sill are provided with limit blocks on one side or both sides of the water stop belt. The dock entrance and the dock entrance water stop structure as described above not only realize the prefabrication and floating transportation of the immersed tubes in multiple batches, but also improve the water stop performance of the dock entrance. When the dock gate of such a dock entrance retaining system is opened and closed, a tugboat is needed to drag or push it. Therefore, in order to reduce the difficulty of opening and closing the dock gate, the dock gate of such a dock entrance retaining system is usually exposed outside the relative space between the two dock piers. In this way, when opening and closing the dock gate, the tugboat can not only be on the outside of the dock gate, but also drag or push the dock gate on the left and right sides of the dock gate. However, this also brings other deficiencies: firstly, the left or right side of the dock gate bears more water flow impact force, resulting in deficiencies in the position and structural stability of the dock gate. Secondly, the distance between the water stop belt and the outside water flow is short, and the short gap is likely to cause a high water flow speed reaching the water stop belt, water flow concentration, and insufficient water self-purification effect, ultimately increasing the damage to the water stop belt and reducing the effective service life of the water stop belt. Summary of the Invention

[0005] In order to reduce the water flow impact force borne by the left or right side of the dock gate, reduce the damage caused by the water flow to the water stop belt, and extend the service life of the water stop belt, the present application provides a temporary deep retaining system for the dock entrance of an immersed tube tunnel and its construction method.

[0006] In the first aspect, the present invention provides a temporary deep retaining system for the dock entrance of an immersed tube tunnel, adopting the following technical solutions:

[0007] A temporary deep retaining system for the dock entrance of an immersed tube tunnel includes a dock gate, two L-shaped dock piers, a dock sill, a dock gate bottom plate, and a water stop belt. The dock pier includes 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 both face the shore side; the dock sill is arranged between the bottoms of the two dock piers, and one surface of the dock sill on the shore side is coplanar with the second right-angled surfaces of the two dock piers to form a concave combined 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 dock sill on the shore side, 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 on the top of the dock gate bottom plate, and the back shore side of the dock gate is attached to the concave combined surface formed by the dock pier and the dock sill; the water stop belt is arranged between the back shore side of the dock gate and the concave combined surface formed by the dock pier and the dock sill.

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

[0009] Preferably, the caisson pier is composed of a lattice type diaphragm wall, and the caisson sill is composed of a T-shaped diaphragm wall. The parts of the caisson pier and the caisson sill above the caisson gate floor directly bear the water pressure transmitted from the caisson gate, and the parts of the caisson pier and the caisson sill below the caisson gate floor are the embedded sections.

[0010] Preferably, the foundation of the caisson gate floor is a cast-in-place pile foundation. A first baffle is provided on the shore side at the top of the caisson gate floor, and second baffles are provided on both sides of the caisson gate floor facing the two caisson piers respectively. A concave positioning structure is formed between the first baffle and the two second baffles. A plurality of spherical bases are arranged on the top of the caisson gate floor, rolling steel balls are installed on the spherical bases, and a plurality of thrust devices are arranged inside the concave positioning structure.

[0011] Preferably, a concave installation groove is provided on the concave combined surface between the caisson pier and the caisson sill, and the water stop belt is embedded in the installation groove.

[0012] Preferably, a mooring post is provided at each of the four corner points at the top of the caisson gate, and the mooring post is used to connect to the winches around the dry dock foundation pit through cables.

[0013] Preferably, two water pumps are installed on the top of the caisson gate. One water pump is used to fill water into the caisson gate, and one water pump is used to drain water outside the caisson gate. Water level gauges are provided on both the shore side of the caisson gate and the inner side of the chamber.

[0014] Preferably, in the closed state of the caisson gate, the water level H in the caisson gate chamber (11) = F S (H W +C S v 2 / (2g)) - H S , where H w is the water level on the river side of the caisson gate (1); v is the water flow velocity; g is the acceleration due to gravity; C S is the adjustment coefficient, Fs is the anti-floating coefficient, and H S is the draft depth of the caisson gate (1) before water injection.

[0015] In a second aspect, the present invention provides a construction method for a temporary deep water retaining system for the dry dock entrance of a immersed tube tunnel, adopting the following technical solutions:

[0016] A construction method for a temporary deep water retaining system for the dry dock entrance of an immersed tube tunnel, comprising the following steps:

[0017] S1: Construction of dock piers;

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

[0019] S3: Construction of dock sills;

[0020] S4: Installation of water stop belts on the shore side of dock piers and dock sills;

[0021] S5: Floating transportation and positioning of the dock gate;

[0022] S6: Filling and sinking of the dock gate;

[0023] S7: Activate the thrust device of the dock gate floor and adjust the position of the dock gate.

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

[0025] 1. The connection between the dock pier and the dock gate is designed as a concave shape, and the dock gate is embedded between the relative spaces of 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 water flow impact force on both sides of the dock gate, improving the position and structural stability of the dock gate;

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

[0027] 3. When the dock gate is closed, first, the steel dock gate is towed between the two dock piers by the winches on both sides of the shore through cables. Secondly, water is injected into the steel dock gate to sink it to the dock gate floor. Finally, the thrust device of the dock gate floor is used to finely adjust the position of the dock gate. The dock gate retaining system cooperates with the long-distance dragging of the winch and the close-range fine adjustment of the thrust device, not only achieving the precise docking of the dock gate and the dock pier, but also being able to cope with the scenarios where it is inconvenient to use a tugboat for adjustment, improving the applicability of the dock gate retaining system;

[0028] 4. Water level automatic monitoring devices are installed inside and outside the dock gate. 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 velocity, the water level inside 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 extended. Description of the Drawings

[0029] Figure 1 is a schematic structural view of the retaining 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 is a schematic structural view of the dock gate in the embodiment of the present application;

[0032] Figure 4 is a schematic structural view of the dock gate bottom plate in the embodiment of the present application.

[0033] Description of the reference numerals: 1. Dock gate; 11. Cabin; 12. Drain hole; 13. Mooring post; 2. Dock pier; 3. Dock sill; 4. Dock gate bottom plate; 41. Concave positioning structure; 42. Spherical base; 43. Thrust device; 5. Waterstop. Detailed Embodiment

[0034] The following will further illustrate the present invention in conjunction with the attached Figure 1 - attached Figure 4 drawings and embodiments.

[0035] This embodiment discloses a temporary deep retaining system for the dock entrance of a immersed tube tunnel dry dock.

[0036] Referring to Figures 1 to 4 , the temporary deep retaining system for the dock entrance of an 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 waterstop 5.

[0037] Referring to Figure 1 and Figure 2 , there are two dock piers 2. Both of the two dock piers 2 are L-shaped. The two dock piers 2 are located between the river bank and the dry dock, and are mirror-symmetrically arranged between the two dock piers 2. Since the dock pier 2 is L-shaped, the dock pier 2 will have two right-angled surfaces, namely the first right-angled surface and the second right-angled surface. The length of the first right-angled surface is longer, and the length of the second right-angled surface is shorter. In this embodiment, the side of the dock pier 2 facing the river bank is the shore side, and the side of the dock pier 2 facing the dry dock is the back shore 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 both face the shore side.

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

[0039] Refer to Figures 1 to 4 , the dock gate bottom plate 4 is arranged between the two dock piers 2, and the dock gate bottom plate 4 is located at the top of the shore side of the dock sill 3. Specifically, a first baffle is arranged on the shore side of the top of the dock gate bottom plate 4, and second baffles are arranged on one side of the dock gate bottom plate 4 facing the two dock piers 2 respectively. 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 gate bottom plate 4, rolling steel balls are installed on the spherical bases 42, and thrust devices 43 are arranged on the inner sides of the concave positioning structure 41 composed of the first baffle and the two second baffles.

[0040] Refer to 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 fits on the concave combined surface composed of the dock pier 2 and the dock sill 3. Further, the water stop belt 5 is arranged between the back shore side of the dock gate 1 and the concave combined surface composed of the dock pier 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 two side dock piers 2 and the bottom dock sill 3. At the same time, the water pressure is used to compress the water stop belt 5 arranged between the dock gate 1, the dock pier 2 and the dock sill 3 to achieve airtight water stop of the dock gate 1.

[0041] Through the above settings, first, since the dock gate 1 is embedded between the relative spaces of 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 borne on the left or right side of the dock gate 1 can be reduced, improving the position and structural stability of the dock gate 1. Second, compared with the prior art, the distance between the water stop belt 5 and the outside water flow is longer. The long gap can slow down the water flow speed reaching the water stop belt 5, reduce the impact force on the water stop belt 5, and the long gap can also disperse the water flow to a certain extent before it reaches the water stop belt 5, thereby reducing the pressure caused by water flow concentration. Moreover, the long gap can make the water flow easier to self-purify, reduce the influence of sediments or impurities on the water stop belt 5, and finally reduce the damage caused by the water flow to the water stop belt 5 and extend the service life of the water stop belt 5. It should be noted that in this scheme, although the dock gate 1 is embedded between the relative spaces of the two dock piers 2, making it difficult for the tugboat to drag or push the dock gate 1 on the left and right sides of the dock gate 1, the setting of the dock gate bottom plate 4 can assist the tugboat to open and close the dock gate 1, thereby reducing the opening and closing difficulty of the dock gate 1.

[0042] Refer to Figures 1 to 4, the dock gate 1 is composed of a steel box structure. The interior of the dock gate 1 is divided into multiple interconnected compartments 11 by steel beams. The multiple interconnected compartments 11 are distributed in multiple rows and columns. When the compartments 11 are filled with water, the dock gate 1 is controlled to sink. When the compartments 11 are drained of water, the dock gate 1 is controlled to float. Drainage holes 12 are provided on both the shore side and the backshore side of the dock gate 1, facilitating filling the dock gate 1 with water during the installation of the dock gate 1 and filling the dry dock with water during the floating transportation of the pipe segments. At each of the four corner points at the top of the dock gate 1, a mooring post 13 is provided. The mooring post 13 is used to connect to the winches around the dry dock foundation pit through cables. When the dock gate 1 is opened and closed, the winches assist in adjusting the position of the dock gate 1 through the cables and the mooring posts 13. By jointly adjusting the position of the dock gate 1 using the winches and the dock gate bottom plate 4, this retaining system can also handle scenarios where it is not convenient to use tugboats for adjustment, improving the applicability of this retaining system. The compartments 11 at the bottom of the dock gate are filled with concrete or sand, increasing the self-weight of the dock gate 1 and lowering the center of gravity of the dock gate 1, enhancing the stability of the dock gate 1 during the floating and sinking process. In this embodiment, the width L of the dock gate 1 is 3 - 5 m larger than the width of the immersed tube section, the height of the dock gate 1 is 3 - 5 m higher than the height of the immersed tube section, the thickness of the dock gate 1 is half of its height, the dock gate 1 is filled with concrete or sand within the height range of 1 / 4 - 1 / 3 from the bottom surface, and furthermore, at least 4 / 5 of the thickness of the dock gate 1 is embedded in the relative space between the two dock piers 2.

[0043] Refer to Figure 1 and Figure 2 , the dock pier 2 is composed of a lattice-type diaphragm wall, the dock sill 3 is composed of a T-shaped diaphragm wall. The parts of the dock pier 2 and the dock sill 3 above the dock gate bottom plate 4 directly bear the water pressure transmitted from the dock gate 1. The parts of the dock pier 2 and the dock sill 3 below the dock gate bottom plate 4 are the embedded sections, ensuring that the stability and bearing capacity requirements of the dock pier 2 and the dock sill 3 are met. The foundation of the dock gate bottom plate 4 is a cast-in-place pile foundation, and the thrust device 43 of the dock gate bottom plate 4 is a hydraulic cylinder. In this embodiment, the number of the thrust devices 43 of the first baffle is the sum of the numbers of the thrust devices 43 of the other two second baffles. In addition, a concave installation groove is provided on the concave combined 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 gate 1 is in close contact with the concave combined surface of the dock pier 2 and the dock sill 3, the water stop 5 will be compressed by force, thus achieving the water stop effect.

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

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

[0046] S1: Construction of the lattice-type diaphragm wall of the dock pier 2;

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

[0048] S3: Construction of the diaphragm wall of the dock sill 3

[0049] S4: Installation of the waterstop 5 on the shore side of the dock pier 2 and the dock sill 3

[0050] S5: Hinge movement, floating transportation and positioning of the dock gate 1

[0051] S6: Flooding and sinking of the dock gate 1

[0052] S7: Open the thrust device 43 of the dock gate floor 4 and adjust the position of the dock gate 1

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

[0054] When the dock gate 1 is in the closed state, the water level H in the dock gate cabin 11 = F S (H W + C S v 2 / (2g)) - H S , where H w is the water level on the riverside side of the dock gate 1; v is the water flow velocity; g is the acceleration due to gravity; C S is the adjustment coefficient, Fs is the anti - floating coefficient, and H S is the draft depth of the dock gate 1 before water injection

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

[0056] The above are all the preferred embodiments of the present invention. It does not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application

Claims

1. A temporary deep-water retaining system for the dry dock entrance of a immersed tube tunnel, characterized in that: It includes a dock gate (1), two L-shaped dock piers (2), a dock sill (3), a dock gate bottom plate (4) and a waterstop belt (5). The dock pier (2) includes a first right-angle surface and a second right-angle surface. The first right-angle surfaces of the two dock piers (2) are arranged opposite to each other, and the second right-angle surfaces of the two dock piers (2) both face the shore side; the dock sill (3) is arranged between the bottoms of the two dock piers (2), and one side of the dock sill (3) on the shore side is coplanar with the second right-angle surfaces of the two dock piers (2) to form a concave combined surface; the dock gate bottom plate (4) is arranged between the two dock piers (2), the dock gate bottom plate (4) is located at the top of the shore side of the dock sill (3), and the dock gate bottom plate (4) is provided with a spherical base and a thrust device (43); the dock gate (1) is arranged between the dock sill (3) and the two dock piers (2) and 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 combined surface formed by the dock pier (2) and the dock sill (3); the waterstop belt (5) is arranged between the back shore side of the dock gate (1) and the concave combined surface formed by the dock pier (2) and the dock sill (3); The dock gate (1) is composed of a steel box structure. The interior of the dock gate (1) is divided into multiple interconnected compartments (11) by steel beams. When the compartments (11) are filled with water, the dock gate (1) is controlled to sink, and when the compartments (11) are drained of water, the dock gate (1) is controlled to float. Multiple drain holes (12) are opened 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 - 5 m larger than the width of the immersed tube section, the height of the dock gate (1) is 3 - 5 m higher than the height of the immersed tube section, the thickness of the dock gate (1) is half of the height of the dock gate (1), and the dock gate (1) is filled with concrete or sand within the height range of 1 / 4 - 1 / 3 from the bottom surface; The foundation of the dock gate 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 gate bottom plate (4), and a second baffle is arranged on each side of the dock gate 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. Multiple spherical bases (42) are arranged on the top of the dock gate bottom plate (4), rolling steel balls are installed on the spherical bases (42), and multiple thrust devices (43) are arranged inside the concave positioning structure (41); 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 one water pump drains 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 compartment (11).

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

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

4. The temporary deep-water retaining system for the dry dock entrance of a immersed tube tunnel according to claim 1, wherein: A mooring post (13) is arranged at each of the four corner points at the top of the dock gate (1), and the mooring post (13) is used to connect to a winch around the dry dock foundation pit through a cable.

5. The temporary deep-water retaining system for the dry dock entrance of a immersed tube tunnel according to claim 1, characterized in that: When the dock gate (1) is in the closed state, the water level H in the dock gate chamber (11) = 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 flow velocity; g is the acceleration due to gravity; C S is the adjustment coefficient, Fs is the anti - floating coefficient, and H S is the draft depth of the dock gate (1) before water injection.

6. A construction method for a temporary deep water retaining system at the dock entrance of a immersed tube tunnel dry dock, which is used for constructing the temporary deep water retaining system at the dock entrance of an immersed tube tunnel dry dock as described in any one of claims 1-5, and is characterized in that: S1: Construction of the dock pier (2); S2: Excavation of the dry dock entrance foundation pit; S3: Construction of the dock sill (3); S4: Installation of the water stop belt (5) on the shore side of the dock pier (2) and the dock sill (3); S5: Floating and positioning of the dock gate (1); S6: Sinking of the dock gate (1) by filling with water; S7: Opening the thrust device (43) of the dock gate bottom plate (4) and adjusting the position of the dock gate (1).

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