Dock gate structure and dry dock system

Abstract

The utility model relates to the technical field of river-crossing immersed tunnel construction, in particular to a dock gate structure and a dry dock system, the dock gate structure comprises an inner support system, a cofferdam system and a water stop system; the cofferdam system comprises a steel cofferdam arranged at the dock entrance, a downward opening is formed in the bottom of the steel cofferdam, and the side wall of the opening can abut against the outer wall of the immersed tube; the inner supporting system comprises a steel inclined support which is used for supporting the steel cofferdam; the waterstop system can carry out waterproofing on the steel cofferdam, the two sides of the steel cofferdam are connected with dock entrance side walls, the bottom of the steel cofferdam is connected with a dock entrance bottom plate, and the immersed tube penetrates through an opening in the steel cofferdam, so that the dock entrance is blocked by the steel cofferdam, then the steel cofferdam is supported through the steel inclined support, and waterproofing is carried out on the steel cofferdam through the waterstop system. Therefore, the dock entrance is blocked under the condition that the immersed tube part is left at the dock entrance, secondary sealing of the dry dock is realized, subsequent construction operation in the dry dock is facilitated, and the construction efficiency is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of construction of river-crossing immersed tube tunnels, in particular to a dock door structure and a dry dock system. Background Art

[0002] As the country vigorously develops urban cross-river tunnel projects and improves urban construction transportation networks, cross-river immersed tube tunnel projects and infrastructure projects have become important components. Among them, immersed tubes are generally manufactured in dry docks. The dry dock closes and opens the dock entrance through caisson-type dock doors. After the caisson-type dock doors are closed, water is poured into the dry dock to achieve lateral movement of the pipe section. The caisson-type dock doors are opened to realize the transportation and installation of the immersed tube. However, due to the limited width of the river channel, it is easy for part of the immersed tube to be left at the dock entrance, making it difficult for the caisson-type dock doors to effectively block the dock entrance, making it difficult for the dry dock to be closed for the second time, seriously affecting subsequent construction. Utility Model Content

[0003] The purpose of the invention of the utility model is to provide a dock door structure and a dry dock system to address the problem in the background technology that when part of the immersed tube is left in the dock mouth, it is difficult to effectively seal the dock mouth with a caisson dock door, making it difficult to perform secondary closure of the dry dock, which seriously affects subsequent construction.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A dock gate structure, comprising an internal support system, a cofferdam system and a water stop system;

[0006] The cofferdam system comprises a steel cofferdam arranged at the dock entrance, the bottom of the steel cofferdam is provided with a downward opening, and the side wall of the opening can abut against the outer wall of the immersed tube;

[0007] The internal support system includes steel inclined supports, and the steel inclined supports are used to support the steel cofferdam;

[0008] The water stopping system is capable of waterproofing the steel cofferdam.

[0009] A dock gate structure described in the present application includes a steel cofferdam arranged at the dock entrance, the dock entrance is blocked by the steel cofferdam, a downward opening is arranged at the bottom of the steel cofferdam, a submerged tube can pass through the steel cofferdam through the opening, and the side wall of the opening can abut against the outer wall of the submerged tube, so that the steel cofferdam and the submerged tube are in close contact, so that the steel cofferdam can block the dock entrance where the submerged tube is placed. Furthermore, the internal support system includes a steel inclined support, and the steel inclined support is used to support the steel cofferdam, so that the steel cofferdam is more stable. Furthermore, the water stop system can Waterproof, thereby increasing the waterproof performance of the steel cofferdam. When part of the immersed tube is left in the dock and needs to be closed for the second time in the dry dock, the two sides of the steel cofferdam are connected to the side walls of the dock, and the bottom of the steel cofferdam is connected to the bottom plate of the dock. The immersed tube passes through the opening on the steel cofferdam, so that the steel cofferdam blocks the dock, and then the steel cofferdam is supported by steel inclined supports. The steel cofferdam is waterproofed by the water-stop system, so that the dock is blocked when part of the immersed tube is left in the dock, realizing the second closure of the dry dock, so that the next construction work can be carried out in the dry dock to ensure construction efficiency.

[0010] As a preferred embodiment of the present invention, the internal support system also includes a first steel purlin and a second steel purlin. The first steel purlin is used to be set on the inner wall of the steel cofferdam, and the second steel purlin is used to be set on the side wall of the dock. The two ends of the steel inclined support are respectively connected to the first steel purlin and the second steel purlin.

[0011] As a preferred solution of the utility model, the inner support system also includes a corbel, which is vertically arranged along the edge of the inner wall of the steel cofferdam, and the corbel is used to connect with the side wall of the dock.

[0012] As a preferred solution of the utility model, the steel cofferdam is assembled from a plurality of cofferdam plates;

[0013] The interior of the steel cofferdam is filled with first concrete.

[0014] As a preferred solution of the utility model, the water-stopping system includes angle steels, which are vertically arranged along the outer wall edge of the steel cofferdam and are used to abut against the side wall of the dock.

[0015] As a preferred solution of the utility model, the water-stopping system further comprises a T-shaped steel plate, and the T-shaped steel plate is used to be arranged between the steel cofferdam and the side wall of the dock.

[0016] As a preferred solution of the utility model, the water-stopping system further comprises a water-stopping steel plate, and the water-stopping steel plate is used to be arranged between the side wall of the opening and the outer wall of the immersed tube.

[0017] As a preferred solution of the utility model, the water stop system further includes a first water stop strip, which is used to be arranged between the steel cofferdam and the bottom plate of the dock;

[0018] The water stop system also includes a second water stop strip, which is used to be arranged between the immersed tube and the dock bottom plate.

[0019] As a preferred solution of the utility model, it also includes a guiding device, the guiding device has a groove for placing the steel cofferdam, and the guiding device is used to be arranged on the top surface of the immersed tube.

[0020] The present application also discloses a dry dock system, including a dry dock, wherein the dry dock includes a dock opening, and both sides of the dock opening have a wall enclosure structure, and a cap plate is arranged at the bottom of the dock opening, and the immersed tube is placed on the cap plate. The dry dock system is characterized in that it also includes the dock gate structure described in the present application, and both sides of the steel cofferdam are connected to the wall enclosure structure, and the bottom of the steel cofferdam extends downward to the bottom of the dock opening and is connected to the cap plate, and one end of the steel oblique support away from the steel cofferdam is connected to the wall enclosure structure;

[0021] The water-stopping system is used for waterproofing between the steel cofferdam and the wall-connected enclosure structure, between the steel cofferdam and the capping plate, between the steel cofferdam and the immersed tube, and between the immersed tube and the capping plate.

[0022] A dry dock system described in the present application includes a dry dock, which includes a dock opening, with wall enclosure structures on both sides of the dock opening, a pedestal plate arranged at the bottom of the dock opening, and a immersed tube placed on the pedestal plate. Both sides of a steel cofferdam are connected to the wall enclosure structures, and the bottom of the steel cofferdam extends downward to the bottom of the dock opening and is connected to the pedestal plate. One end of a steel inclined support away from the steel cofferdam is connected to the wall enclosure structure. A water-stop system is used for waterproofing between the steel cofferdam and the wall enclosure structure, between the steel cofferdam and the pedestal plate, between the steel cofferdam and the immersed tube, and between the immersed tube and the pedestal plate. The dry dock system of the present application can seal the dock opening when part of the immersed tube is left in the dock opening, thereby realizing secondary closure of the dry dock, so that the next construction work can be carried out in the dry dock to ensure construction efficiency.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0024] 1. A dock gate structure described in the present application comprises a steel cofferdam arranged at the dock entrance, the dock entrance is blocked by the steel cofferdam, a downward opening is arranged at the bottom of the steel cofferdam, the immersed tube can pass through the steel cofferdam through the opening, the side wall of the opening can abut against the outer wall of the immersed tube, so that the steel cofferdam and the immersed tube are in close contact, so that the steel cofferdam can block the dock entrance where the immersed tube is placed, further, the internal support system comprises a steel inclined support, the steel inclined support is used to support the steel cofferdam, so that the steel cofferdam is more stable, further, the water stop system can be used to Waterproofing is carried out to increase the waterproof performance of the steel cofferdam. When part of the immersed tube is left in the dock and a secondary closure of the dry dock is required, the two sides of the steel cofferdam are connected to the side walls of the dock, and the bottom of the steel cofferdam is connected to the bottom plate of the dock. The immersed tube passes through the opening on the steel cofferdam, so that the steel cofferdam blocks the dock, and then the steel cofferdam is supported by steel inclined supports. The steel cofferdam is waterproofed by the water stop system, so that the dock is blocked when part of the immersed tube is left in the dock, realizing the secondary closure of the dry dock, so that the next construction work can be carried out in the dry dock to ensure construction efficiency.

[0025] 2. A dry dock system described in the present application comprises a dry dock, which comprises a dock opening, and wall enclosure structures are provided on both sides of the dock opening. A pedestal plate is arranged at the bottom of the dock opening, and a immersed tube is placed on the pedestal plate. Both sides of the steel cofferdam are connected to the wall enclosure structures, and the bottom of the steel cofferdam extends downward to the bottom of the dock opening and is connected to the pedestal plate. One end of the steel inclined support away from the steel cofferdam is connected to the wall enclosure structure. A water-stop system is used for waterproofing between the steel cofferdam and the wall enclosure structure, between the steel cofferdam and the pedestal plate, between the steel cofferdam and the immersed tube, and between the immersed tube and the pedestal plate. The dry dock system of the present application can seal the dock opening when part of the immersed tube is left in the dock opening, thereby realizing secondary closure of the dry dock, so as to facilitate the next construction work in the dry dock and ensure construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a plan view of the dry dock system of the present application.

[0027] Figure 2 yes Figure 1 A partial enlarged view of point A.

[0028] Figure 3 yes Figure 2 A partial enlarged view of point B.

[0029] Figure 4 yes Figure 3 A partial enlarged view of point C.

[0030] Figure 5 yes Figure 1 Front section view of .

[0031] Figure 6 It is a schematic diagram of the steel purlin structure of this application.

[0032] Figure 7 yes Figure 1 Side cross-sectional view of .

[0033] Figure 8 It is a schematic diagram of the connection between the steel purlin and the top of the immersed tube.

[0034] Fig. 9 It is a schematic diagram of waterproofing of the bottom of the immersed tube and the bottom plate of the dock.

[0035] Fig.10 It is a schematic diagram of waterproofing of steel purlin and dock floor.

[0036] Markings in the figure: 1-internal support system, 11-first steel purlin, 12-second steel purlin, 13-corbel, 14-steel inclined support, 2-steel cofferdam, 21-first cofferdam plate, 22-second cofferdam plate, 23-third cofferdam plate, 24-opening, 3-waterstop system, 31-T-shaped steel plate, 32-angle steel, 33-waterstop steel plate, 34-first waterstop, 35-second waterstop, 4-wall enclosure structure, 5-immersed tube, 51-immersed tube top plate, 52-immersed tube bottom plate, 6-capping plate, 7-dry dock, 71-dock mouth, 8-guide device, 9-retaining wall, 10-first concrete. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in combination with test examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0038] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all expressions based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0039] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0040] In addition, the expressions “first”, “second”, “third”, etc. that appear in the terms are merely descriptions used to distinguish the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0041] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0042] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0043] Example 1

[0044] like Figure 1-Figure 7 As shown, a dock door structure described in this embodiment includes an internal support system 1, a cofferdam system and a water stop system 3;

[0045] The cofferdam system includes a steel cofferdam 2 disposed at the dock opening 71, and a downward opening 24 is disposed at the bottom of the steel cofferdam 2, and the side wall of the opening 24 can abut against the outer wall of the immersed tube 5;

[0046] The inner support system 1 includes a steel diagonal support 14, which is used to support the steel cofferdam 2;

[0047] The water stop system 3 can waterproof the steel cofferdam 2 .

[0048] The dock opening 71 is blocked by a steel cofferdam 2. A downward opening 24 is provided at the bottom of the steel cofferdam 2. The immersed tube 5 can pass through the steel cofferdam 2 through the opening 24. Figure 8 The side wall of the opening 24 can abut against the outer wall of the immersed tube 5, so that the steel cofferdam 2 and the immersed tube 5 are in close contact, so that the steel cofferdam 2 can block the docking port 71 where the immersed tube 5 is placed. Further, the internal support system includes a steel inclined support 14, and the steel inclined support 14 is used to support the steel cofferdam 2, so that the steel cofferdam 2 is more stable. Further, the water stop system can waterproof the steel cofferdam 2, thereby increasing the waterproof performance of the steel cofferdam 2. When part of the immersed tube 5 is left in the docking port 71 and needs to be dry docked for secondary sealing When closed, both sides of the steel cofferdam 2 are connected to the side walls of the dock opening 71, the bottom of the steel cofferdam 2 is connected to the bottom plate of the dock opening 71, and the immersed tube 5 passes through the opening 24 on the steel cofferdam 2, so that the steel cofferdam 2 blocks the dock opening 71, and then the steel cofferdam 2 is supported by the steel inclined support 14, and the steel cofferdam 2 is waterproofed by the water stop system 3, so that the dock opening 71 is blocked when part of the immersed tube 5 is left in the dock opening 71, thereby realizing the secondary closure of the dry dock 7, so that the next construction work can be carried out in the dry dock 7 to ensure construction efficiency.

[0049] The dock gate structure of this embodiment is formed by combining the internal support system 1, the cofferdam system and the water-stopping system 3. The structure is simple, and the structure has supporting stability and water-stopping functions, which is convenient for quickly sealing the dock opening 71.

[0050] like Figure 2-Figure 3 As shown, the inner support system 1 also includes a first steel purlin 11 and a second steel purlin 12. The first steel purlin 11 is used to be arranged on the inner wall of the steel cofferdam 2, and the second steel purlin 12 is used to be arranged on the side wall of the dock 71. The two ends of the steel oblique support 14 are respectively connected to the first steel purlin 11 and the second steel purlin 12. By arranging the first steel purlin 11 on the inner wall of the steel cofferdam 2 and the second steel purlin 12 on the side wall of the dock 71, a connection position is provided for the steel oblique support 14, and the first steel purlin 11 and the second steel purlin 12 are also used to reinforce the steel cofferdam 2 and the side wall of the dock 71. Further, the steel oblique support 14 is detachably connected to the first steel purlin 11 and the second steel purlin 12, which is not only convenient for installation, but also convenient for later disassembly.

[0051] Among them, in this embodiment, the inner wall of the steel cofferdam 2 refers to the side of the steel cofferdam 2 close to the dry dock 7, and the outer wall of the steel cofferdam 2 refers to the side of the steel cofferdam 2 close to the river channel.

[0052] like Figure 3-Figure 4As shown, the inner support system 1 further includes a corbel 13, which is vertically arranged along the inner wall edge of the steel cofferdam 2, and the corbel 13 is used to connect with the side wall of the dock 71. By vertically arranging the corbel 13 at the inner wall edge of the steel cofferdam 2, the corbel 13 is used to connect with the side wall of the dock 71, thereby enhancing the connection strength between the steel cofferdam 2 and the side wall of the dock 71, and also providing effective vertical support for the steel cofferdam 2.

[0053] In a preferred manner, the first steel perimeter purlin 11 and the second steel perimeter purlin 12 are both connected to the corbel 13 , so that the first steel perimeter purlin 11 and the second steel perimeter purlin 12 form a broken line shape through the corbel 13 .

[0054] A preferred method is as follows Figure 6 As shown, the steel cofferdam 2 is assembled from a plurality of cofferdam plates, so as to facilitate the transportation of the steel cofferdam 2. During installation, adjacent cofferdam plates are connected into a whole by welding. In this embodiment, as shown in FIG. Figure 5 As shown, the steel cofferdam 2 is combined with the side wall of the dock opening 71, the bottom plate of the dock opening 71, and the immersed tube 5 to form an overall stable sealing and water-stopping system to seal and waterproof the dock opening 71.

[0055] like Figure 3-Figure 4 As shown, the interior of the steel cofferdam 2 is filled with the first concrete 10, so that the steel cofferdam 2 forms a water retaining structure with a load-bearing function to effectively resist the impact force of the water flow in the river channel and better exert the water retaining effect.

[0056] like Figure 4 As shown, the water stop system 3 includes an angle steel 32, which is vertically arranged along the outer wall edge of the steel cofferdam 2, and the angle steel 32 is used to abut against the side wall of the dock 71. By vertically arranging the angle steel 32 at the outer wall edge of the steel cofferdam 2, a water stop effect is ensured between the steel cofferdam and the side of the dock 71, thereby blocking the river water from entering the dry dock 7.

[0057] like Figure 4 As shown, the water stop system 3 also includes a T-shaped steel plate 31, which is used to be arranged between the steel cofferdam 2 and the side wall of the dock 71. By arranging the T-shaped steel plate 31 between the steel cofferdam 2 and the side wall of the dock 71, the water stop effect between the steel cofferdam and the side of the dock 71 is further enhanced. Furthermore, the T-shaped steel plate 31 is connected to the side wall of the dock 71, and a part of the T-shaped steel plate 31 is located inside the steel cofferdam 2.

[0058] like Figure 5 As shown, the water stop system 3 also includes a water stop steel plate 33, which is used to be arranged between the side wall of the opening 24 and the outer wall of the immersed tube 5. By arranging the water stop steel plate 33, a water stop effect is ensured between the steel cofferdam 2 and the immersed tube 5. The water stop steel plate 33 is arranged on the three surfaces where the steel cofferdam 2 and the immersed tube 5 meet. Figure 5 .

[0059] like Figure 5 , Fig.10 As shown, the water stop system 3 also includes a first water stop strip 34, which is used to be arranged between the steel cofferdam 2 and the bottom plate of the dock 71. By arranging the first water stop strip 34, a water stop effect is ensured between the bottom of the steel cofferdam 2 and the bottom plate of the dock 71;

[0060] like Figure 5 , Fig. 9 The water stop system 3 shown also includes a second water stop strip 35, which is used to be arranged between the immersed tube 5 and the bottom plate of the dock 71. By arranging the second water stop strip 35, a water stop effect is ensured between the bottom of the immersed tube 5 and the bottom plate of the dock 71.

[0061] In this embodiment, the first waterstop 34 and the second waterstop 35 are preferably Q-type waterstops.

[0062] In this embodiment, the water-stopping components of the water-stopping system 3 are mainly arranged around the entire annular section of the steel cofferdam 2 and the immersed tube 5 to ensure that the annular section of the ground preparation does not leak water.

[0063] A preferred method is as follows Figure 8 As shown, it also includes a guide device 8, the guide device 8 has a groove for placing the steel cofferdam 2, and the guide device 8 is used to be arranged on the top surface of the immersed tube 5. By arranging the guide device 8, it is convenient to install the steel cofferdam 2 on the immersed tube top plate 51 of the immersed tube 5;

[0064] Furthermore, if Figure 8 As shown, when waterproofing is performed between the steel cofferdam 2 and the immersed tube top plate 51 of the immersed tube 5, the waterstop steel plate 33 is set in the groove of the guide device 8, and the waterstop steel plate 33 is partially embedded in the steel cofferdam 2, so that waterproofing is performed between the guide device 8 and the steel cofferdam 2 through the waterstop steel plate 33.

[0065] A preferred method is as follows Figure 5 As shown, it also includes a retaining wall 9, which is arranged on the top of the wall-connecting enclosure structure 4. The retaining wall 9 abuts against the steel cofferdam 2 to reinforce the steel cofferdam 2.

[0066] Example 2

[0067] like Figure 1-Figure 10 As shown, on the basis of Example 1, this embodiment discloses a dry dock system, including a dry dock 7, the dry dock 7 includes a dock opening 71, and the dock opening 71 has a wall enclosure structure 4 on both sides, a cap plate 6 is arranged at the bottom of the dock opening 71, and the immersed tube 5 is placed on the cap plate 6, and also includes the dock door structure described in Example 1, the two sides of the steel cofferdam 2 are connected to the wall enclosure structure 4, the bottom of the steel cofferdam 2 extends downward to the bottom of the dock opening 71 and is connected to the cap plate 6, and the end of the steel oblique support 14 away from the steel cofferdam 2 is connected to the wall enclosure structure 4;

[0068] The water-stop system 3 is used for waterproofing between the steel cofferdam 2 and the wall enclosure structure 4, between the steel cofferdam 2 and the base plate 6, between the steel cofferdam 2 and the immersed tube 5, and between the immersed tube 5 and the base plate 6, wherein the angle steel 32 is vertically arranged along the outer wall edge of the steel cofferdam 2, and the angle steel 32 is abutted against the wall enclosure structure 4, the T-shaped steel plate 31 is arranged between the steel cofferdam 2 and the wall enclosure structure 4, the water-stop steel plate 33 is arranged between the side wall of the opening 35 and the outer wall of the immersed tube 5, the first water-stop strip 34 is arranged between the steel cofferdam 2 and the base plate 6, and the second water-stop strip 35 is arranged between the bottom plate 52 of the immersed tube and the base plate 6, wherein the wall enclosure structure 4 is the side wall of the dock 71, and the base plate 6 is the bottom plate of the dock 71.

[0069] The dry dock system of the present application can seal the dock opening 71 when part of the immersed tube 5 is left in the dock opening 71, thereby realizing secondary closure of the dry dock 7, so as to facilitate the next construction work in the dry dock 7 and ensure construction efficiency.

[0070] In the present application, the bottom plate of the dock opening 71 refers to the base plate 6 arranged at the bottom of the dock opening 71 . When the immersed tube 5 is placed on the base plate 6 , the bottom plate 52 of the immersed tube abuts against the base plate 6 .

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dock door structure, characterized in that: It comprises an internal support system (1), a cofferdam system and a water stop system (3); The cofferdam system comprises a steel cofferdam (2) arranged at the dock entrance (71), the bottom of the steel cofferdam (2) being provided with a downward opening (24), the side wall of the opening (24) being capable of abutting against the outer wall of the immersed tube (5); The inner support system (1) comprises a steel oblique support (14), wherein the steel oblique support (14) is used to support the steel cofferdam (2); The water-stopping system (3) is capable of waterproofing the steel cofferdam (2).

2. The dock door structure according to claim 1, characterized in that: The inner support system (1) further comprises a first steel purlin (11) and a second steel purlin (12); the first steel purlin (11) is used to be arranged on the inner wall of the steel cofferdam (2); the second steel purlin (12) is used to be arranged on the side wall of the dock opening (71); and the two ends of the steel oblique support (14) are respectively connected to the first steel purlin (11) and the second steel purlin (12).

3. The dock door structure according to claim 2, characterized in that: The inner support system (1) further comprises a corbel (13), wherein the corbel (13) is vertically arranged along the inner wall edge of the steel cofferdam (2), and the corbel (13) is used to connect with the side wall of the dock opening (71).

4. The dock door structure according to claim 1, characterized in that: The steel cofferdam (2) is assembled from a plurality of cofferdam plates; The interior of the steel cofferdam (2) is filled with a first concrete (10).

5. The dock door structure according to claim 1, characterized in that: The water-stopping system (3) comprises an angle steel (32), which is vertically arranged along the outer wall edge of the steel cofferdam (2), and the angle steel (32) is used to abut against the side wall of the dock opening (71).

6. The dock door structure according to claim 5, characterized in that: The water-stopping system (3) further comprises a T-shaped steel plate (31), and the T-shaped steel plate (31) is used to be arranged between the steel cofferdam (2) and the side wall of the dock opening (71).

7. The dock door structure according to claim 5, characterized in that: The water-stopping system (3) further comprises a water-stopping steel plate (33), wherein the water-stopping steel plate (33) is used to be arranged between the side wall of the opening (24) and the outer wall of the immersed tube (5).

8. The dock door structure according to claim 7, characterized in that: The water stop system (3) further comprises a first water stop strip (34), wherein the first water stop strip (34) is used to be arranged between the steel cofferdam (2) and the bottom plate of the dock opening (71); The water-stop system (3) further comprises a second water-stop strip (35), wherein the second water-stop strip (35) is used to be arranged between the immersed tube (5) and the bottom plate of the dock opening (71).

9. The dock door structure according to any one of claims 1 to 8, characterized in that: It also comprises a guide device (8), wherein the guide device (8) has a groove for placing the steel cofferdam (2), and the guide device (8) is used to be arranged on the top surface of the immersed tube (5).

10. A dry dock system, comprising a dry dock (7), the dry dock (7) comprising a dock opening (71), both sides of the dock opening (71) having a wall enclosure structure (4), a base plate (6) being arranged at the bottom of the dock opening (71), and a immersed tube (5) being placed on the base plate (6), characterized in that: It also includes a dock gate structure as claimed in any one of claims 1 to 9, wherein both sides of the steel cofferdam (2) are connected to the wall enclosure structure (4), the bottom of the steel cofferdam (2) extends downward to the bottom of the dock opening (71) and is connected to the cap plate (6), and one end of the steel inclined support (14) away from the steel cofferdam (2) is connected to the wall enclosure structure (4); The water-stopping system (3) is used to waterproof between the steel cofferdam (2) and the wall-connected enclosure structure (4), between the steel cofferdam (2) and the base plate (6), between the steel cofferdam (2) and the immersed tube (5), and between the immersed tube (5) and the base plate (6).

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