Method for assembling a large-section immersed tube end seal door

Abstract

A method for assembling a large-section immersed tube end sealing gate includes: installing brackets and lower supports, installing H-beams, installing panels, and installing Ω-shaped waterstop steel plates. In the step of installing brackets and lower supports, the brackets are installed using a balanced hoisting mechanism. The specific steps for installing the H-beams are: hoisting the H-beams and tilting them relative to the horizontal plane, attaching the hoisting cable to the end steel shell, pulling the bottom end of the H-beams to rotate them to a vertical position, and simultaneously pulling both ends of the H-beams into the joint. This application, by reasonably setting the fishing points on the steel beams, allows the H-beams to be erected and tilted when hoisted, extending the upper part of the H-beams towards the tube section. This makes it easier for the upper end of the H-beams to enter the tube section first, and for the lower part of the H-beams to be pushed into the tube section. The posture adjustment of the tube section is easy, greatly improving the ease of installation of the H-beams.

Description

Technical Field

[0001] This invention belongs to the field of immersed tunnel construction technology, and in particular relates to a method for assembling end-sealing doors for large-section immersed tunnels. Background Technology

[0002] Immersed tunnels are an advanced tunnel structure widely used in underwater transportation. They are constructed by placing prefabricated tunnel sections on the seabed and then assembling them to form a complete tunnel. During the installation and construction of immersed tunnels, end seals must be installed at both ends of the prefabricated tunnel sections to ensure the airtightness and structural stability between the sections. The end seals play a crucial role in the construction and subsequent operation of immersed tunnels, and their installation quality directly affects the overall performance of the tunnel.

[0003] End sealing gates are typically composed of H-beams and panels. During installation, brackets and lower supports need to be installed inside the immersed tunnel sections. The H-beams are then inserted into the tunnel sections, with their top and bottom connected to the brackets and lower supports respectively. The panels are then installed onto the H-beams. In practice, a crane is usually used to lift the brackets, and then a hand-operated hoist is used to pull them into the tunnel section. The brackets are precisely aligned with the embedded parts inside the tunnel section, and finally, the brackets are fixed inside the immersed tunnel using the embedded parts. Similarly, the H-beams are first lifted by a crane and then pulled into the corresponding position inside the immersed tunnel using a hand-operated hoist.

[0004] However, existing technologies have some significant drawbacks in the process of sealing the installation end. During the hoisting and pulling of the brackets and H-beams into the immersed tunnel, the hoisting cables first contact the end steel shell installed on the end face of the immersed tunnel, hindering the movement of the brackets and H-beams into the tunnel. When they are further pulled into the tunnel using a hand-operated hoist, their posture changes, making it difficult for the brackets to align with the embedded parts, and the H-beams are prone to excessive tilting. When the tunnel cross-section is large, the internal space of the tunnel section is also large, resulting in longer and heavier H-beams. The difficulty in aligning the brackets forces construction workers to repeatedly adjust their posture at height, greatly increasing the operational risks. Furthermore, once the longer and heavier H-beams have tilted excessively, it is difficult to straighten them inside the tunnel, causing many inconveniences for subsequent installation work. In addition, since the top plate of the immersed tube has upper chamfers on both sides, when installing the brackets on the upper chamfers, the brackets need to be adjusted to an inclined state to adapt to the installation position. However, the brackets are only suspended in the air by the crane hook. Under these circumstances, it is difficult for the hand chain hoist to accurately adjust the posture of the brackets, making it difficult to install the brackets at the upper chamfers. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the technical problems in the related art.

[0006] Therefore, one aspect of this application proposes a method for assembling a large-section immersed tube end sealing gate, comprising the following steps:

[0007] Install brackets and lower supports: Install multiple brackets to the top of the pipe section and multiple lower supports to the bottom of the pipe section. The number of brackets is the same as the number of lower supports, and each bracket is vertically opposite to a corresponding lower support.

[0008] Install H-beams: Move multiple H-beams into the pipe section, and connect the top and bottom of each H-beam to the corresponding bracket and the corresponding lower support respectively;

[0009] Install panels: Install multiple panels on the H-beams, weld adjacent panels together, and combine multiple panels into a door panel;

[0010] Install Ω-shaped water-stop steel plate: Install Ω-shaped water-stop steel plate in the gap between the door panel and the pipe section. The Ω-shaped water-stop steel plate seals the gap between the outer edge of the door panel and the inner edge of the pipe section port.

[0011] In the step of installing the H-beam, the H-beam is installed into the pipe section by hoisting, and the specific steps are as follows:

[0012] A lifting cable is connected to the fishing point on the steel beam of the H-beam, and the lifting cable is connected to the hook of the crane; a first reference end, a second reference end, and a reference line are set on the H-beam; the two ends of the H-beam are respectively set as the first reference end and the second reference end; the reference line is the line connecting the first reference end and the second reference end, and the reference line passes through the center of gravity of the H-beam; the fishing point on the steel beam of the H-beam is located on one side of the reference line, and is simultaneously located between the center of gravity of the H-beam and the first reference end;

[0013] The crane lifts the H-beam with its hook and stands it upright with the first reference end on top and the second reference end on the bottom, and the first reference end of the H-beam is closer to the end face of the pipe section than the second reference end.

[0014] The crane moves the H-beam horizontally and attaches the lifting cable connected to the H-beam to the end steel shell installed on the end face of the pipe section, so that the first reference end portion of the H-beam extends into the pipe section, and the top surface inside the pipe section is higher than the position of the first reference end of the H-beam.

[0015] A hand-operated hoist is installed on the bracket to connect the first reference end of the H-beam. A forklift is used to push the second reference end of the H-beam into the pipe section, causing the H-beam to rotate to a vertical position. The first reference end of the H-beam rises with the rotation of the H-beam and touches the top surface inside the pipe section. The second reference end of the H-beam rises with the rotation of the H-beam and enters the pipe section.

[0016] Simultaneously operate the hand-operated hoist and forklift on the bracket to push the first and second reference ends of the H-beam into the pipe section, so that the first and second reference ends of the H-beam are respectively attached to the bracket and the lower support.

[0017] In the technical solution, the method is designed to set the fishing points of the steel beams in a reasonable way so that the H-beams are raised and tilted when they are hoisted, and the upper part of the H-beams extends into the pipe section. This makes it easier for the upper part of the H-beams to enter the pipe section first, and the lower part of the H-beams to be pushed into the pipe section. The posture of the pipe section is easy to adjust, which greatly improves the installation convenience of the H-beams.

[0018] In some embodiments, during the steps of installing the bracket and lower support, the bracket is installed using a balancing hoisting mechanism. The balancing hoisting mechanism includes a balance beam, a hanging component, and a counterweight. The counterweight is located at one end of the balance beam, and the bottom of the hanging component is connected to the middle of the balance beam. The specific steps for installing the bracket are as follows:

[0019] Secure the bracket to the end of the balance beam furthest from the counterweight, and connect the top of the hanging component to the crane hook;

[0020] The crane lifts and moves the balancing hoisting mechanism, inserting one end of the balancing beam into the pipe section so that the corbel is located directly below the embedded part set at the top of the joint;

[0021] Lift and raise the balance hoisting mechanism, attach the bracket to the embedded part; remove the bracket from the balance beam and fix it to the embedded part.

[0022] In the technical solution, the method is designed to keep the bracket balanced during installation by setting up a balanced hoisting mechanism. The balanced beam allows the bracket to be extended into the pipe section independently, and avoids the hanging parts from contacting the end steel shell installed on the end face of the pipe section. The bracket can be accurately aligned and fitted with the embedded parts by translation. The operation is simple and improves the installation accuracy and efficiency of the bracket.

[0023] In some embodiments, the hanging device is a hand-operated hoist; four hanging devices are provided; a first hanging part and a second hanging part are provided at intervals on the balance beam; the first hanging device and the second hanging device are symmetrically connected to both sides of the first hanging part; the third hanging device and the fourth hanging device are symmetrically connected to both sides of the second hanging part.

[0024] When the bracket is installed onto the upper chamfer of the pipe section using a balanced hoisting mechanism, the specific steps are as follows:

[0025] The crane moves the balancing hoisting mechanism and inserts one end of the balancing beam into the pipe section, so that the bracket is located directly below the embedded part of the upper chamfer.

[0026] The crane's vertical translation and balancing lifting mechanism places one side of the balancing beam onto the surface of the upper chamfer.

[0027] Simultaneously pull the two hangers on the side of the balance beam away from the upper chamfer surface to raise the side of the balance beam away from the upper chamfer, so that the bracket tilts with the balance beam and attaches to the embedded part on the upper chamfer; remove the bracket from the balance beam and fix it to the embedded part.

[0028] In the technical solution, the method uses a hand-operated hoist as a hanging component. By simultaneously pulling the hand-operated hoist on a specific side, the tilt of the balance beam can be achieved, allowing the bracket to accurately fit the embedded part on the chamfer. This reduces the difficulty of adjusting the bracket's posture, enabling the bracket to quickly align with and connect to the embedded part, further improving the flexibility and accuracy of bracket installation.

[0029] In some embodiments, the bracket is installed onto the upper chamfer of the pipe section via a balanced hoisting mechanism:

[0030] Raise the balance beam away from the upper chamfer until the side of the bracket closest to the upper chamfer surface is against the upper chamfer surface. Stop operating the two hanging parts on the side of the balance beam away from the upper chamfer surface and simultaneously pull the two hanging parts on the side of the balance beam closest to the upper chamfer surface to lower the balance beam on the side of the upper chamfer until the surface of the bracket is parallel to the surface of the embedded part. Move the balance beam to attach the bracket to the embedded part.

[0031] In the technical solution, the method is designed to refine the operation sequence of the balance beam, simultaneously adjust the posture of both sides of the balance beam, adjust the bracket and the embedded part to be parallel, and leave a gap between the bracket and the embedded part, thereby avoiding the limiting structure and connection structure set on the embedded part, ensuring good docking between the bracket and the embedded part, and further improving the installation accuracy of the bracket.

[0032] In some embodiments, the step of installing the H-beam by hoisting it into the pipe section is replaced by:

[0033] A lifting cable is connected to the fishing point on the steel beam of the H-beam, and the lifting cable is connected to the hook of the crane; a first reference end, a second reference end, and a reference line are set on the H-beam; the two ends of the H-beam are respectively set as the first reference end and the second reference end; the reference line is the line connecting the first reference end and the second reference end, and the reference line passes through the center of gravity of the H-beam; the fishing point on the steel beam of the H-beam is located on one side of the reference line, and is simultaneously located between the center of gravity of the H-beam and the first reference end;

[0034] The crane lifts the H-beam with its hook and stands it upright with the first reference end on top and the second reference end on the bottom, and the second reference end of the H-beam is closer to the end face of the pipe section than the first reference end.

[0035] The crane moves the H-beam horizontally and attaches the lifting cable connected to the H-beam to the end steel shell installed on the end face of the pipe section, so that the second reference end portion of the H-beam extends into the pipe section, and the top surface inside the pipe section is higher than the position of the first reference end of the H-beam.

[0036] A protective steel plate is installed on the inner edge of the lower part of the pipe section port, a hand chain hoist is installed on the bracket to connect the first reference end of the H-beam, and a hand chain hoist is installed on the lower support to connect the second reference end of the H-beam.

[0037] Operate the hand-operated hoist installed on the lower support to pull the second reference end of the H-beam against the protective steel plate;

[0038] Operate the hand-operated hoist installed on the bracket to pull the H-beam to rotate to a vertical position. The first reference end of the H-beam rises with the rotation of the H-beam and attaches to the top surface inside the pipe section. The second reference end of the H-beam rises with the rotation of the H-beam and enters the pipe section completely.

[0039] Two hand-operated hoists are used simultaneously to push the first and second reference ends of the H-beam into the pipe section, so that the first and second reference ends of the H-beam are respectively attached to the bracket and the lower support.

[0040] In the technical solution, this method provides another way to set the steel beam fishing point. When the H-beam is lifted, the H-beam is made to stand up and tilt, and the lower part of the H-beam extends into the pipe section. This makes it easier for the lower part of the H-beam to enter the pipe section first, and the upper part of the H-beam to be pushed into the pipe section. The posture adjustment of the pipe section is easy, which greatly improves the installation convenience of the H-beam.

[0041] In some embodiments, the steel beam fishing point of the H-beam is located on the side surface of the H-beam.

[0042] In the technical solution, the method is designed so that the fishing point of the steel beam is set on the side. When the H-beam is laid flat for transportation, the fishing point of the steel beam can be facing upwards, so that the hook can directly connect to the fishing point of the steel beam to lift the H-beam from the stacking site or the transport equipment. The lifted H-beam can be directly stood up and tilted, so as to facilitate the installation of pipe sections and facilitate the effective connection between the transportation and installation of H-beam.

[0043] In some embodiments, during the panel installation step, the panel is hoisted onto the H-beam, and the specific steps are as follows:

[0044] Connect the lifting cable to the fishing spot on the panel and connect the lifting cable to the hook of the crane; the fishing spot on the panel is located between one end of the panel and the center of gravity of the panel.

[0045] The crane lifts the panel using its hook and erects it.

[0046] The crane moves the panel horizontally and attaches the lifting cable connected to the panel to the end steel shell installed on the end face of the pipe section;

[0047] Install two hand-operated hoists on the H-beam and connect them to both ends of the panel. Operate the two hand-operated hoists simultaneously to pull the panel toward and attach it to the H-beam, and then weld the panel to the H-beam.

[0048] In the technical solution, the method is designed to quickly move the panel to the vicinity of the H-beam, and then use a hand-operated hoist to pull the panel toward and attach it to the H-beam for welding. The whole process is simple and efficient, greatly improving the installation speed of the panel. The simultaneous use of two hand-operated hoists can pull both ends of the panel evenly, keeping the panel upright, and the panel can be attached to the surface of the H-beam efficiently and accurately.

[0049] In some embodiments, a gap is provided between adjacent H-beams, and the hand chain hoist is connected to the panel through the gap between the H-beams; the panel is welded to the two adjacent H-beams.

[0050] In the technical solution, this method not only provides space for the connection and operation of the hand chain hoist, but also enhances the connection strength between the panel and the H-beam, improving the overall structural stability of the end sealing door.

[0051] In some embodiments, when an H-beam is installed, the installation of the next set of brackets and lower supports begins; after all brackets and lower supports are installed, the panel installation begins; the brackets, lower supports, and H-beams are installed sequentially from the middle of the pipe section to both sides.

[0052] In the technical solution, the method is designed to make the entire assembly process more reasonable and orderly, so that the assembly of various structures can be carried out synchronously to a certain extent. This helps to reduce cross-operations and mutual interference during construction, and improves construction efficiency and quality control.

[0053] In some embodiments, the Ω-shaped waterstop steel plates are first installed one by one from the middle of the bottom of the pipe section to both sides, then one by one from both sides of the pipe section upwards simultaneously, and then one by one from both sides of the top of the pipe section towards the middle simultaneously.

[0054] In the technical solution, the method is designed to ensure the flatness and sealing of the Ω-shaped waterstop steel plate during installation, eliminate the influence of thermal expansion on the installation and assembly of the Ω-shaped waterstop steel plate, and enable adjacent Ω-shaped waterstop steel plates to be accurately connected, thereby effectively improving the installation quality of the Ω-shaped waterstop steel plate and enhancing the sealing performance of the end sealing door.

[0055] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0056] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0057] Figure 1 This is a schematic diagram of the pipe section according to an embodiment of this application;

[0058] Figure 2 This is a construction diagram illustrating the bracket installation of the large-section immersed tube end sealing assembly method according to the embodiments of this application;

[0059] Figure 3 This is a structural schematic diagram of the balanced hoisting mechanism of the large-section immersed tube end sealing door assembly method according to the embodiments of this application;

[0060] Figure 4 This is a construction diagram showing the installation of the corbel on the upper chamfer in the assembly method for the large-section immersed tube end sealing gate according to the embodiments of this application.

[0061] Figure 5 This is a construction diagram illustrating the H-beam installation of the large-section immersed tube end-sealing gate assembly method according to the embodiments of this application. Figure 1 ;

[0062] Figure 6 This is a construction diagram illustrating the H-beam installation of the large-section immersed tube end-sealing gate assembly method according to the embodiments of this application. Figure 2 ;

[0063] Figure 7 This is a construction diagram illustrating the H-beam installation of the large-section immersed tube end-sealing gate assembly method according to the embodiments of this application. Figure 3 ;

[0064] Figure 8 This is a construction diagram illustrating the H-beam installation of the large-section immersed tube end-sealing gate assembly method according to the embodiments of this application. Figure 4 ;

[0065] Figure 9 This is a construction diagram illustrating the H-beam installation of the large-section immersed tube end-sealing gate assembly method according to the embodiments of this application. Figure 5 ;

[0066] Figure 10 This is a construction diagram illustrating the H-beam installation of the large-section immersed tube end-sealing gate assembly method according to the embodiments of this application. Figure 6 ;

[0067] Figure 11 A construction diagram illustrating the panel installation of the large-section immersed tube end sealing door assembly method according to the embodiments of this application;

[0068] Figure 12 This is a schematic diagram of the panel assembly into a door panel in the large-section immersed tube end sealing door assembly method according to the embodiments of this application;

[0069] Figure 13 This is a construction diagram of the Ω-shaped waterstop steel plate in the assembly method of the large-section immersed tube end sealing gate according to the embodiments of this application.

[0070] In the picture:

[0071] 100. Pipe section; 101. Base plate; 102. Side wall; 103. Top plate; 104. Central partition wall; 105. Driveway; 106. Maintenance access; 107. Upper chamfer; 108. Lower chamfer; 109. Embedded parts; 110. End steel shell; 120. Protective steel plate;

[0072] 200, Cow leg; 300, Lower support;

[0073] 400. H-beam; 401. Steel beam fishing spot; 402. First reference end; 403. Second reference end; 404. Reference line;

[0074] 500, panel; 501, board material fishing spot;

[0075] 600Ω waterstop steel plate;

[0076] 700. Balancing hoisting mechanism; 701. Balancing beam; 702. Hoisting components; 703. Counterweights;

[0077] 800, Hand chain hoist; 900, Hoisting cable; 1000, Forklift; 1100, Door panel. Detailed Implementation

[0078] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0079] In the description of this invention, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0080] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0081] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0082] It should be noted that in the field of immersed tunnels, an immersed tunnel is composed of 100 sets of multiple tunnel sections assembled together. (See also...) Figure 1 The interior of pipe section 100 typically includes a driveway 105, with both ends of the driveway 105 penetrating the pipe section 100. The cross-section of pipe section 100 is roughly rectangular, typically comprising a base plate 101, side walls 102, and a top plate 103. Two driveways 105 are usually provided, and two intermediate partition walls 104 are provided in the middle of pipe section 100, forming a maintenance passage 106 between the two partition walls 104. To achieve a more rational stress distribution, enhance structural rationality, and improve the structural strength of pipe section 100, the two sides of the top plate 103 typically slope downwards and connect to the top of the side walls 102. The sloping portions on both sides of the top plate 103 serve as the upper chamfer 107 of pipe section 100, and a lower chamfer 108 is typically provided between the bottom of the side walls 102 and the base plate 101. Pipe section 100 is usually prefabricated in a dry dock. During the prefabrication of pipe section 100, end steel shells 110 are installed on the end face of pipe section 100. After the prefabrication is completed, end sealing doors are assembled on the ports at both ends of pipe section 100 to seal the internal space of pipe section 100.

[0083] like Figures 2 to 13 As shown, in an illustrative embodiment of the large-section immersed tube end-sealing gate assembly method of the present invention, the large-section immersed tube end-sealing gate assembly method includes the following steps:

[0084] Install brackets 200 and lower supports 300: Install multiple brackets 200 to the top of the pipe section 100. The top plate 103 of the pipe section 100 is embedded with pre-embedded parts 109 during prefabrication, so that the pre-embedded parts 109 are exposed on the inner surface of the top plate 103 of the pipe section 100 after prefabrication. Each bracket 200 is attached to a corresponding pre-embedded part 109 and fixedly connected to it. Install multiple lower supports 300 to the bottom of the pipe section 100. The bottom plate 101 of the pipe section 100 is embedded with pre-embedded parts 109 during prefabrication, so that the pre-embedded parts 109 are exposed on the inner surface of the bottom plate 101 of the pipe section 100 after prefabrication. Each lower support 300 is attached to a corresponding pre-embedded part 109 and fixedly connected to it. The number of brackets 200 is the same as the number of lower supports 300, and each bracket 200 is vertically opposite to a corresponding lower support 300.

[0085] Install H-beams 400: Move multiple H-beams 400 into pipe section 100, and connect the top and bottom of each H-beam 400 to the corresponding bracket 200 and the corresponding lower support 300 respectively. Thus, one H-beam 400 is connected to one bracket 200 and one lower support 300 respectively. Each H-beam 400 is installed and fixed by a set of brackets 200 and lower supports 300.

[0086] Mounting Panel 500: Install multiple panels 500 on the H-beam 400, welding adjacent panels 500 together. See [link / reference]. Figure 12 This allows multiple panels 500 to be combined to form a door panel 1100. Panels 500 are typically fixed to H-beams 400 by welding. H-beams 400 typically have brackets 200 and lower supports 300 connected to one side, while the other side is attached to the panels 500. Panels 500 are usually rectangular. After welding and assembling into door panel 1100, its outer contour is usually outside the port of pipe section 100. Therefore, the outer contour of door panel 1100 needs to be cut to match the outer contour of door panel 1100 to the port of pipe section 100.

[0087] Install the Ω-shaped water-stop steel plate 600: Install the Ω-shaped water-stop steel plate 600 in the gap between the door panel 1100 and the pipe section 100. Usually, one side of the Ω-shaped water-stop steel plate 600 is attached to the surface of the door panel 1100 and welded to it; the other side of the Ω-shaped water-stop steel plate 600 is attached to the end face of the pipe section 100 and welded to the embedded part 109 embedded in the end face of the pipe section 100, so that the Ω-shaped water-stop steel plate 600 seals the gap between the outer edge of the door panel 1100 and the inner edge of the pipe section 100 port, and the assembled end-sealing door structure closes one end of the pipe section 100.

[0088] In some embodiments, see Figures 2 to 3In the step of installing the bracket 200 and the lower support 300, the bracket 200 is installed using a balancing hoisting mechanism 700. The balancing hoisting mechanism 700 includes a balancing beam 701, a hanging component 702, and a counterweight 703. The counterweight 703 is located at one end of the balancing beam 701, and the bottom of the hanging component 702 is connected to the middle of the balancing beam 701.

[0089] The specific steps for installing the bracket 200 using the 700 balanced hoisting mechanism are as follows:

[0090] Fix the bracket 200 to the end of the balance beam 701 away from the counterweight 703, and connect the top of the hanging component 702 to the hook of the crane.

[0091] The crane lifts and moves the balancing lifting mechanism 700, inserting one end of the balance beam 701, mounted on the bracket 200, into the pipe section 100, and aligning the bracket 200 vertically with the embedded part 109 pre-embedded in the top plate 103 of the pipe section 100. The crane raises the hook by winding the cable, so that the hook lifts the balance beam 701 through the hanging member 702. The lifted balance beam 701 is off the ground, and the weight of the counterweight 703 keeps the balance beam 701 horizontal during the lifting and translation. While maintaining a horizontal state, the balance beam 701 is moved by the crane until one end extends into the pipe section 100.

[0092] The crane further raises the balancing lifting mechanism 700, attaching the bracket 200 to the embedded part 109. The bracket 200 is then removed from the balancing beam 701 and fixed to the embedded part 109. The bracket 200 is typically bolted to the balancing beam 701 for installation and fixation. The bracket 200 is also typically welded to the embedded part 109 to ensure its installation strength, stably support the H-beam 400, improve the stability of the end seal, and allow it to effectively resist underwater pressure. The bracket 200 can also be bolted to the embedded part 109 for disassembly of the end seal after the pipe section 100 is assembled. Common lifting equipment such as truck cranes and tower cranes are typically used.

[0093] This method is designed to install the bracket 200 using a balanced hoisting mechanism 700. When the balance beam 701 is hoisted, the counterweight 703 balances the weight of the bracket 200, ensuring that the balance beam 701 remains horizontal during hoisting and translation. This allows the bracket 200 to enter the pipe section 100 in a stable posture, enabling it to quickly and accurately align with the embedded part 109 and connect with it. This improves the accuracy and efficiency of the bracket 200 installation, eliminating the need for workers to spend extended periods installing the bracket 200 at a high position inside the large-section pipe section 100, thus enhancing operational safety. In addition, there is a gap between the bracket 200 and the hanger 702, so that when the bracket 200 enters the pipe section 100, the hanger 702 will not contact the end steel shell 110 on the end face of the pipe section 100. The end steel shell 110 will not obstruct the translation of the bracket 200 into the pipe section 100, nor will it affect the posture of the bracket 200 and the balance beam 701. This ensures that the bracket 200 and the balance beam 701 can enter the pipe section 100 in a horizontal posture, thereby quickly and accurately connecting the embedded part 109.

[0094] The crane operators cannot directly see the bracket 200 and the embedded part 109. They need to move the balance beam 701 under the guidance of ground personnel to position the bracket 200 below the embedded part 109. Furthermore, to facilitate alignment of the bracket 200 with the embedded part 109, one end of the balance beam 701 connected to the counterweight 703 is connected to an adjusting cable. This allows the crane operators, under ground personnel's guidance, to only roughly align the bracket 200 below the embedded part 109. By pulling the adjusting cable on the ground, they can fine-tune the position of the balance beam 701 on the horizontal plane, ensuring accurate alignment of the bracket 200 with the embedded part 109. This further improves the alignment accuracy of the bracket 200 with the embedded part 109 during installation, reduces the difficulty of crane operation, and increases work efficiency.

[0095] In some embodiments, see Figures 2 to 4 The lifting component 702 is a hand-operated hoist 800, and four lifting components 702 are provided. A first lifting section and a second lifting section are spaced apart on the balance beam 701. The first and second lifting components are symmetrically connected to both sides of the first lifting section, and the third and fourth lifting components are symmetrically connected to both sides of the second lifting section, so that the connection points of the four hand-operated hoists 800 on the balance beam 701 of the balance lifting mechanism 700 are distributed at the four corners of a rectangle.

[0096] The specific steps for installing the bracket 200 on the upper chamfer 107 of pipe section 100 using a balanced hoisting mechanism are as follows:

[0097] The crane moves the balancing hoisting mechanism 700, inserts one end of the balance beam 701 and the bracket 200 into the pipe section 100, and vertically aligns the bracket 200 with the embedded part 109 pre-embedded on the chamfer 107 of the pipe section 100.

[0098] The crane vertically moves the balancing hoisting mechanism 700, raising the balancing beam 701, and attaching one end of the balancing beam 701 to the surface of the upper chamfer 107. At this time, the bracket 200 moves closer to the embedded part 109 as the balancing beam 701 rises, but there is still a certain gap between the bracket 200 and the embedded part 109 in the vertical direction.

[0099] Simultaneously pull the two hanging parts 702 on the side of the balance beam 701 away from the surface of the upper chamfer 107, raising the side of the balance beam 701 away from the upper chamfer 107. This causes the balance beam 701 to gradually rotate to an inclined state around the part that contacts the upper chamfer 107. As the balance beam 701 gradually tilts, the bracket 200 moves closer to and contacts the embedded part 109 until the bracket 200 is completely attached to the embedded part 109 of the upper chamfer 107. Remove the bracket 200 from the balance beam 701 and fix it to the embedded part 109.

[0100] This method is designed to rotate the balance beam 701 by simultaneously pulling the hand chain hoist 800 on a specific side. The balance beam 701 remains horizontal in the length direction and tilts to the horizontal plane in the width direction. The posture of the bracket 200 on the balance beam 701 can be adjusted smoothly and flexibly. The posture adjustment of the bracket 200 is easy, and the surface of the bracket 200 can be quickly aligned with the embedded part 109 and attached to the surface of the embedded part 109 on the upper chamfer 107 in parallel. The embedded part 109 and the bracket 200 are fixedly connected by surface contact, so that the bracket 200 is installed on the embedded part 109 on the upper chamfer 107 efficiently and stably. In addition, one side of the balance beam 701 is first attached to the surface of the upper chamfer 107 as a fulcrum, and then the balance beam 701 is rotated by pulling the hand chain hoist 800 in sync. The lateral force generated by the rotating balance beam 701 further stabilizes it on the surface of the upper chamfer 107, so that the balance beam 701 rotates stably and the posture adjustment of the bracket 200 is stable.

[0101] In some embodiments, see Figure 4 In the specific steps of installing the bracket 200 on the upper chamfer 107 of the pipe section 100 using the balanced hoisting mechanism: Raise the side of the balance beam 701 away from the upper chamfer 107, so that the side of the bracket 200 near the surface of the upper chamfer 107 is attached to the surface of the upper chamfer 107 or the embedded part 109 on the upper chamfer 107. Stop operating the two hanging parts 702 on the side of the balance beam 701 away from the surface of the upper chamfer 107, and simultaneously pull the two hanging parts 702 on the side of the balance beam 701 near the surface of the upper chamfer 107 to lower the side of the balance beam 701 near the upper chamfer 107 until the surface of the bracket 200 is parallel to the surface of the embedded part 109; move the balance beam 701 to attach the bracket 200 to the embedded part 109.

[0102] To position the bracket 200 during installation, a limiting member is usually provided on the embedded part 109. The embedded part 109 protrudes relative to the surface of the bracket 200, and the side of the bracket 200 is attached to the limiting member, so that the bracket 200 can be accurately aligned with the installation position and fixedly connected to the embedded part 109.

[0103] The method is designed such that when the balance beam 701 rotates to the point where one edge of the bracket 200 contacts the surface of the upper chamfer 107 or the embedded part 109 on the upper chamfer 107, the balance beam 701 is stopped from moving further towards the surface of the upper chamfer 107 on the side away from the upper chamfer 107. The side of the balance beam 701 that is close to the upper chamfer 107 is lowered, and the balance beam 701 is kept rotating continuously so that the side of the bracket 200 that was in contact with the surface of the upper chamfer 107 or the embedded part 109 is disengaged. The surface of the bracket 200 is then adjusted to be aligned with the surface of the embedded part 109. While maintaining parallelism, a gap is formed between the bracket 200 and the embedded part 109. The limiting member on the embedded part 109 is located in this gap, allowing the bracket 200 to avoid the limiting member. This prevents the bracket 200 from directly touching the embedded part 109, which would cause the limiting member to push against the bracket 200 and cause it to tilt. After adjusting the posture of the bracket 200, it is then moved to fit onto the embedded part 109, ensuring a good connection between the bracket 200 and the embedded part 109 and further improving the installation accuracy of the bracket 200.

[0104] In some embodiments, see Figures 5 to 7 In the installation of H-beam 400, the H-beam 400 is hoisted into pipe section 100, and the specific steps are as follows:

[0105] A lifting cable 900 is connected to the fishing point 401 on the steel beam of the H-beam 400, and the lifting cable 900 is connected to the hook of the crane. The H-beam 400 has a first reference end 402, a second reference end 403, and a reference line 404. The two ends of the H-beam 400 are respectively designated as the first reference end 402 and the second reference end 403. The reference line 404 is the line connecting the first reference end 402 and the second reference end 403, and passes through the center of gravity of the H-beam 400. The fishing point 401 on the steel beam of the H-beam 400 is located on one side of the reference line 404, and simultaneously between the center of gravity of the H-beam 400 and the first reference end 402.

[0106] The crane lifts the H-beam 400 using its hook. As the H-beam 400 is lifted, its center of gravity drops directly below the steel beam fishing point 401. Because the steel beam fishing point 401 is on one side of the reference line 404, there is an angle between the line connecting the steel beam fishing point 401 and the center of gravity of the H-beam 400 and the reference line 404. The erected H-beam 400 is tilted. Furthermore, because the first reference end 402 is closer to the steel beam fishing point 401, the first reference end 402 of the erected H-beam 400 is on top, and the second reference end 403 is below. Moreover, because the erected H-beam 400 is tilted, and the steel beam fishing point 401 is on the side furthest from the pipe section 100 after the H-beam 400 is erected, the first reference end 402 of the H-beam 400 is closer to the end face of the pipe section 100 than the second reference end 403.

[0107] The crane moves the H-beam 400 horizontally and attaches the lifting cable 900 connected to the H-beam 400 to the end steel shell 110 installed on the end face of the pipe section 100. This allows the first reference end 402 of the H-beam 400, which is closer to the pipe section 100, to extend into the pipe section 100. The top surface of the inside of the pipe section 100 is higher than the position of the first reference end 402 of the H-beam 400. At the same time, the second reference end 403 of the H-beam 400 is made to be flush with the bottom surface of the inside of the pipe section 100 in the horizontal direction.

[0108] A hand-operated hoist 800 is installed on the bracket 200 to connect the first reference end 402 of the H-beam 400. A forklift 1000 is used to push the second reference end 403 of the H-beam 400 into the pipe section 100, causing the H-beam 400 to rotate. Since the lifting cable 900 contacts the end steel shell 110, the center of rotation is located at the bottom end of the contact part between the lifting cable 900 and the end steel shell 110. During the rotation of the H-beam 400, the first reference end 402 at the top of the H-beam 400 moves upward with the rotation and attaches to the upper surface inside the pipe section 100, while the second reference end 403 at the bottom of the H-beam 400 maintains its height position with the rotation and enters the pipe section 100 until the H-beam 400 rotates to a vertical state, so that both ends of the pipe section 100 are completely inside the pipe section 100.

[0109] Simultaneously operate the hand-operated hoist 800 and forklift 1000 on the bracket 200 to push the first reference end 402 and the second reference end 403 of the H-beam 400 into the pipe section 100 until the first reference end 402 and the second reference end 403 of the H-beam 400 are respectively attached to the bracket 200 and the lower support 300. Then fix both ends of the H-beam 400 to the bracket 200 and the lower support 300 respectively, thereby fixing the H-beam 400 inside the pipe section 100.

[0110] This method is designed by placing the steel beam fishing point 401 closer to one end and offsetting it from the center of gravity. This allows the H-beam 400 to be erected and tilted when lifted, bringing one end closer to the pipe section 100 and allowing it to enter the pipe section 100 first. The other end of the H-beam 400 only needs to be pushed by the forklift 1000 to fully insert it into the pipe section 100. No additional support or positioning is required during the insertion process. The posture adjustment is completed during the insertion process, ensuring that the H-beam 400 is aligned with the port of the pipe section 100 and smoothly enters the pipe section 100. This greatly improves the ease of installation of the H-beam 400. Furthermore, during the insertion of the H-beam 400 into the pipe section 100, the H-beam 400 remains suspended to prevent it from pressing down on the pipe section 100 and causing damage. Further, when the lifting cable is attached to the end steel shell so that the first reference end 402 of the H-beam partially extends into the pipe section 100, the second reference end 403 of the H-beam 400 is horizontally aligned with the bottom surface inside the pipe section 100. This prevents excessive height difference between the top surface inside the pipe section 100 and the first reference end 402 of the H-beam 400, ensuring that during the straightening process, the bottom end of the H-beam does not get stuck at the bottom of the pipe section and cannot enter. The bottom end of the H-beam remains horizontally aligned with the bottom surface inside the pipe section, allowing it to be directly pulled horizontally into the pipe section in subsequent steps. The top end of the H-beam rises precisely to a height aligned with the top surface inside the pipe section 100, thus making contact with it.

[0111] The fishing spot is usually a lifting base that is fixedly connected to the part to be lifted. The lifting base is equipped with lifting holes so that the hook passes through the lifting holes and hooks onto the lifting base, thereby enabling the part to be lifted to be lifted.

[0112] In some embodiments, see Figures 8 to 10 This provides an alternative hoisting method for H-beam 400, used to install the H-beam 400 into pipe section 100 during the installation process. The specific steps are as follows:

[0113] A lifting cable 900 is connected to the fishing point 401 on the steel beam of the H-beam 400, and the lifting cable 900 is connected to the hook of the crane. The H-beam 400 has a first reference end 402, a second reference end 403, and a reference line 404. The two ends of the H-beam 400 are respectively designated as the first reference end 402 and the second reference end 403. The reference line 404 is the line connecting the first reference end 402 and the second reference end 403, and passes through the center of gravity of the H-beam 400. The fishing point 401 on the steel beam of the H-beam 400 is located on one side of the reference line 404, and simultaneously between the center of gravity of the H-beam 400 and the first reference end 402.

[0114] The crane lifts the H-beam 400 using its hook. As the H-beam 400 is lifted, its center of gravity drops directly below the steel beam fishing point 401. Because the steel beam fishing point 401 is on one side of the reference line 404, there is an angle between the line connecting the steel beam fishing point 401 and the center of gravity of the H-beam 400 and the reference line 404. The erected H-beam 400 is tilted. Furthermore, because the first reference end 402 is closer to the steel beam fishing point 401, the first reference end 402 of the erected H-beam 400 is on top, and the second reference end 403 is below. Further, because the erected H-beam 400 is tilted, and the steel beam fishing point 401 is on the side closer to the pipe section 100 after the H-beam 400 is erected, the second reference end 403 of the H-beam 400 is closer to the end face of the pipe section 100 than the first reference end 402.

[0115] The crane moves the H-beam 400 horizontally and attaches the lifting cable 900 connected to the H-beam 400 to the end steel shell 110 installed on the end face of the pipe section 100. This allows the second reference end 403 of the H-beam 400, which is closer to the pipe section 100, to extend into the pipe section 100. The top surface of the pipe section 100 is higher than the position of the first reference end 402 of the H-beam 400.

[0116] A protective steel plate 120 is installed on the inner edge of the lower part of the pipe section 100. A first reference end 402 for connecting the hand chain hoist 800 to the H-beam 400 is installed on the bracket 200. A second reference end 403 for connecting the hand chain hoist 800 to the H-beam 400 is installed on the lower support 300.

[0117] Operate the hand-operated hoist 800 installed on the lower support 300 to pull the second reference end 403 of the H-beam 400 to adhere to the protective steel plate 120, so that the bottom of the pipe section 100 supports the H-beam 400, and the protective steel plate 120 prevents the H-beam 400 from crushing the pipe section 100.

[0118] Operate the hand-operated hoist 800 installed on the bracket 200 to pull the first reference end 402 of the H-beam 400 towards the pipe section 100, causing the H-beam 400 to rotate around its bottom. During the rotation, the first reference end 402 at the top of the H-beam 400 moves upward and attaches to the upper surface inside the pipe section 100, while the second reference end 403 at the bottom of the H-beam 400 rises to a certain extent and enters the pipe section 100, until the H-beam 400 rotates to a vertical position, so that both ends of the pipe section 100 are completely inside the pipe section 100.

[0119] Two hand-operated chain hoists 800 are operated simultaneously to push the first reference end 402 and the second reference end 403 of the H-beam 400 into the pipe section 100 until the first reference end 402 and the second reference end 403 of the H-beam 400 are respectively attached to the bracket 200 and the lower support 300. Then, both ends of the H-beam 400 are fixed to the bracket 200 and the lower support 300 respectively, thereby fixing the H-beam 400 inside the pipe section 100.

[0120] This method is designed by setting the fishing point 401 on the steel beam, so that when the H-beam 400 is hoisted, it can be erected and tilted, so that one end of the H-beam 400 is closer to the pipe section 100 and enters the pipe section 100 first. The bottom end of the H-beam enters the pipe section 100 first. With the support of the protective steel plate 120 at the bottom of the pipe section 100, it can be easily straightened by the hand chain hoist 800, making the operation more labor-saving. Moreover, the posture adjustment is completed during the insertion of the H-beam 400, ensuring that the H-beam 400 is aligned with the port of the pipe section 100 after posture adjustment and enters the pipe section 100 smoothly, which greatly improves the convenience of the installation of the H-beam 400.

[0121] Furthermore, due to the considerable height of the internal space of the large-section immersed tunnel section 100, and the length of the H-beam 400 being approximately the same as or slightly less than the height of the internal space of the tunnel section 100, the H-beam 400 is relatively long and heavy, making it difficult to adjust its posture after hoisting and accurately install it into the tunnel section 100. The method of this application, through the setting of the steel beam fishing point 401, allows the H-beam 400 to be erected to an inclined state when hoisted, thus making one end of the H-beam 400 protrude relatively in the horizontal direction. Furthermore, due to the relatively long length of the H-beam 400, the horizontal distance between the protruding end of the H-beam 400 and the steel beam fishing point 401 is also relatively large. Therefore, when the hoisting cable 900 is attached to the end steel shell 110, one end of the H-beam 400 is preferentially sent into the space of the tunnel section 100 without the need for posture adjustment during the process. Furthermore, when one end of the H-beam 400 is first inserted into the internal space of the pipe section 100, the top of the H-beam 400 has already reached the height of the bracket 200, or the bottom end of the H-beam 400 has already landed inside the pipe section 100 and is aligned with the lower support 300 in height. Subsequently, the H-beam 400 can be straightened using a forklift 1000 or a hand-operated hoist 800, allowing the H-beam 400 to be smoothly installed into the internal space of the pipe section 100. The posture adjustment of the H-beam 400 during the process is simple. Therefore, when the method of this application is applied to the installation of the end sealing gate of a large-section immersed tube, there is no need for complex posture adjustment of the heavy and long H-beam 400, and the posture adjustment is relatively easy. Moreover, the longer length of the H-beam 400 allows one end to enter the pipe section 100 first and be straightened subsequently, thus enabling the rapid and efficient installation of the H-beam 400 for the end sealing gate.

[0122] In some embodiments, see Figures 5 to 9 The steel beam anchor point 401 of the H-beam 400 is located on the side surface of the H-beam 400, that is, the steel beam anchor point 401 is located on the outer surface of the flange plate of the H-beam 400. This design places the steel beam anchor point 401 on one side of the H-beam 400. Since the H-beam 400 is relatively long, it is usually stacked horizontally during stacking or transportation so that the steel beam anchor point 401 faces upward, facilitating direct connection with the hook and direct lifting of the H-beam 400. The lifted H-beam 400 can be directly erected and tilted to facilitate insertion into the pipe section 100. The transportation, stacking, and installation of the H-beam 400 can be smoothly connected.

[0123] In some embodiments, see Figure 11 In the installation of panel 500, panel 500 is hoisted onto H-beam 400. The specific steps are as follows:

[0124] Connect the lifting cable 900 to the fishing spot 501 on the panel 500, and connect the lifting cable 900 to the hook of the crane. The fishing spot 501 on the panel 500 is located between one end of the panel 500 and the center of gravity of the panel 500.

[0125] The crane lifts panel 500 using hooks. Due to the placement of the board hook points 501 on panel 500, the lifted panel 500 stands upright. Furthermore, board hook points 501 can only be placed on the two sides of panel 500, so that when the lifted panel 500 is upright, it is roughly in a vertical position.

[0126] The crane moves panel 500 horizontally and attaches the lifting cable 900 connected to panel 500 to the end steel shell 110 installed on the end face of pipe section 100. At this time, there is still a certain gap between panel 500 and H-beam 400.

[0127] Two hand chain hoists 800 are installed on the H-beam 400 and connected to both ends of the panel 500 respectively. The two hand chain hoists 800 are operated synchronously to pull the panel 500 toward and attach it to the H-beam 400, and then the panel 500 is welded to the H-beam 400.

[0128] This method is designed so that the panel 500 is in a vertical position when lifted, facilitating direct contact and connection with the H-beam 400. No posture adjustment is required during panel 500 installation; the panel 500 is pulled towards and welded onto the H-beam 400 using a hand-operated hoist 800. The entire process is simple and efficient, significantly increasing the installation speed of the panel 500. Furthermore, the simultaneous use of two hand-operated hoists 800 evenly pulls both ends of the panel 500, maintaining its vertical position against the H-beam 400, ensuring rapid and secure connection.

[0129] In some embodiments, a gap is provided between adjacent H-beams 400, and a manual hoist 800 is connected to a panel 500 through the gap between the H-beams 400. The panel 500 is welded to the two adjacent H-beams 400. To facilitate operation within the internal space of the pipe section 100, the manual hoist 800 is typically mounted on a flange of the H-beam 400 near the interior of the pipe section 100. This method, by using the gaps between the H-beams 400, not only provides a passage for workers to enter and exit the internal space of the pipe section 100 after the H-beams 400 are installed, but also provides a connecting space so that the inner-mounted manual hoist 800 can connect to the hoisted panel 500 through this space. In addition, the gaps between the H-beams 400 ensure that the number of H-beams 400 distributed horizontally in the cross-section of the pipe section 100 is moderate, avoiding an excessive number of H-beams 400 arranged continuously, thereby preventing the overall weight and cost of the end sealing door from becoming too large. Furthermore, the panel 500 is welded to two H-beams 400 on both sides in the horizontal direction, so that the same panel 500 can be supported and fixed by the two H-beams 400. At the same time, the hand chain hoist 800 extending between the adjacent H-beams 400 can connect the middle of the panel 500 in the horizontal direction. When the panel 500 is pulled toward the H-beams 400 and brought into contact with them, the panel 500 can simultaneously come into contact with the two adjacent H-beams 400, so as to quickly complete the welding connection between the two H-beams 400 and the panel 500.

[0130] In some embodiments, when one H-beam 400 is installed, the installation of the next set of brackets 200 and lower supports 300 begins; after all brackets 200 and all lower supports 300 are installed, the installation of the panel 500 begins; the brackets 200, lower supports 300 and H-beam 400 are all installed sequentially from the middle of the pipe section 100 to both sides.

[0131] More specifically, a bracket 200 and a vertically opposite lower support 300 form a set of fixing components. The bracket 200 and lower support 300 of this set of fixing components are installed simultaneously. After the first set of fixing components is installed, the installation of the second set begins. Since the space for the first set of fixing components is freed up, the installation of the first H-beam 400 begins simultaneously, inserting it into the pipe section 100 and connecting it to the first set of fixing components. After the second set of fixing components is installed, the installation of the third set of fixing components begins, and the installation of the second H-beam 400 begins simultaneously, inserting it into the pipe section 100 and connecting it to the second set of fixing components. Following the aforementioned method, the installation of the bracket 200, lower support 300, and H-beam 400 is synchronized to a certain extent.

[0132] Furthermore, since the installation sequence is from the middle to both sides, the first set of fixing components is located in the middle of the pipe section 100. After the first set of fixing components is installed, the installation of the second set of fixing components in the first direction and the second set of fixing components in the second direction are started simultaneously on both sides of the first set of fixing components. At the same time, the first H-beam 400 is installed at the position of the first set of fixing components. After the second set of fixing components in the first direction is installed, the installation of the third set of fixing components in the first direction begins. At the same time, the installation of the second H-beam 400 in the first direction begins. The second H-beam 400 in the first direction is inserted into the pipe section 100 and connected to the second set of fixing components in the first direction. After the second set of fixing components in the second direction is installed, the installation of the third set of fixing components in the second direction begins. At the same time, the installation of the second H-beam 400 in the second direction begins. The second H-beam 400 in the second direction is inserted into the pipe section 100 and connected to the second set of fixing components in the second direction. As described above, installation begins from the middle and proceeds to both sides, with the installation of the corbel 200, the lower support 300, and the H-beam 400 proceeding simultaneously to a certain extent.

[0133] This method design makes the entire assembly process more rational and orderly, allowing the assembly of various structures to be carried out synchronously to a certain extent, thus improving construction efficiency. The installation of the bracket 200 and lower support 300 is carried out simultaneously with the installation of the H-beam 400 at different positions, and extends unidirectionally or from the middle to both sides on the end face of the pipe section 100, without causing work overlap. The installation of the bracket 200 and lower support 300 and the H-beam 400 will not interfere with each other, ensuring high construction efficiency. In addition, starting the installation from the middle allows the installed H-beam to quickly form support for the pipe section 100 in the middle, maintaining the stability of the cross-sectional shape of the pipe section 100. This avoids the inability to smoothly install the H-beam 400 or accurately align the H-beam 400 with the bracket 200 and lower support 300 due to deformation of the pipe section 100 ends during subsequent component installation, reducing the occurrence of installation errors.

[0134] In some embodiments, see Figure 13 The Ω-shaped waterstop steel plates 600 are first installed from the middle of the bottom of the pipe section 100 outwards, then simultaneously installed from both sides of the pipe section 100 upwards, and finally simultaneously installed from both sides of the top of the pipe section 100 towards the middle. Figure 13The arrows indicate the installation direction of the Ω-shaped waterstop steel plate 600. This method is designed so that the Ω-shaped waterstop steel plates 600 are installed sequentially from the bottom center along two routes to the top center, ensuring that the Ω-shaped waterstop steel plates 600 are installed sequentially along both routes. After welding the end faces of adjacent Ω-shaped waterstop steel plates 600 together, a corresponding length of Ω-shaped waterstop steel plate 600 is finally installed at the top center, leaving an appropriate length. This completes the sealing of the entire circumference gap, eliminating the interaction between the Ω-shaped waterstop steel plates 600 caused by thermal expansion, which could lead to weld cracking. Adjacent Ω-shaped waterstop steel plates 600 can be accurately butt-jointed and welded together, effectively improving the installation quality of the Ω-shaped waterstop steel plates 600 and enhancing the sealing performance of the end seal door.

[0135] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0136] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A method for assembling end-sealing gates for large-section immersed tubes, characterized in that, Includes the following steps: Install brackets and lower supports: Install multiple brackets to the top of the pipe section and multiple lower supports to the bottom of the pipe section. The number of brackets is the same as the number of lower supports, and each bracket is vertically opposite to a corresponding lower support. Install H-beams: Move multiple H-beams into the pipe section, and connect the top and bottom of each H-beam to the corresponding bracket and the corresponding lower support, respectively; Installation panel: Install multiple panels on the H-beam, and weld adjacent panels together to combine the multiple panels into a door panel; Install Ω-shaped water-stop steel plate: Install Ω-shaped water-stop steel plate on the gap between the door panel and the pipe section, the Ω-shaped water-stop steel plate seals the gap between the outer edge of the door panel and the inner edge of the pipe section port; In the step of installing the H-beam, the H-beam is installed into the pipe section by hoisting, and the specific steps are as follows: A lifting cable is connected to the fishing point on the steel beam of the H-beam, and the lifting cable is connected to the hook of the crane; a first reference end, a second reference end, and a reference line are set on the H-beam; the two ends of the H-beam are respectively set as the first reference end and the second reference end; the reference line is the line connecting the first reference end and the second reference end, and the reference line passes through the center of gravity of the H-beam; the fishing point on the steel beam of the H-beam is located on one side of the reference line, and is simultaneously located between the center of gravity of the H-beam and the first reference end; The crane lifts the H-beam with its hook and stands it upright with the first reference end on top and the second reference end on the bottom, and the first reference end of the H-beam is closer to the end face of the pipe section than the second reference end. The crane moves the H-beam horizontally and attaches the lifting cable connected to the H-beam to the end steel shell installed on the end face of the pipe section, so that the first reference end portion of the H-beam extends into the pipe section, and the top surface inside the pipe section is higher than the position of the first reference end of the H-beam. A hand-operated hoist is installed on the bracket to connect the first reference end of the H-beam. A forklift is used to push the second reference end of the H-beam into the pipe section, causing the H-beam to rotate to a vertical position. The first reference end of the H-beam rises with the rotation of the H-beam and touches the top surface inside the pipe section. The second reference end of the H-beam rises with the rotation of the H-beam and enters the pipe section. Simultaneously operate the hand-operated hoist and forklift on the bracket to push the first and second reference ends of the H-beam into the pipe section, so that the first and second reference ends of the H-beam are respectively attached to the bracket and the lower support.

2. The assembly method for the end sealing gate of the large-section immersed tube according to claim 1, characterized in that, In the steps of installing the bracket and lower support, the bracket is installed using a balancing hoisting mechanism. The balancing hoisting mechanism includes a balance beam, a hanging component, and a counterweight. The counterweight is located at one end of the balance beam, and the bottom of the hanging component is connected to the middle of the balance beam. The specific steps for installing the bracket are as follows: Secure the bracket to the end of the balance beam away from the counterweight, and connect the top of the hanging component to the hook of the crane; The crane lifts and moves the balancing hoisting mechanism, extending one end of the balancing beam into the pipe section, so that the bracket is located directly below the embedded part set at the top of the joint; Lift the balancing hoisting mechanism and attach the bracket to the embedded part; remove the bracket from the balancing beam and fix it to the embedded part.

3. The assembly method for the end sealing gate of the large-section immersed tube according to claim 2, characterized in that, The hanging component is a hand-operated hoist; four hanging components are provided; a first hanging part and a second hanging part are provided at intervals on the balance beam; the first and second hanging components are symmetrically connected to both sides of the first hanging part; the third and fourth hanging components are symmetrically connected to both sides of the second hanging part. When the bracket is installed onto the upper chamfer of the pipe section using a balanced hoisting mechanism, the specific steps are as follows: The crane moves the balancing hoisting mechanism horizontally, extending one end of the balancing beam into the pipe section, so that the bracket is located directly below the pre-embedded part of the upper chamfer; The crane vertically moves the balancing hoisting mechanism, bringing one side of the balancing beam onto the surface of the upper chamfer; Simultaneously pull the two hanging parts on the side of the balance beam away from the upper chamfer surface to raise the side of the balance beam away from the upper chamfer, so that the bracket tilts with the balance beam and attaches to the embedded part on the upper chamfer; remove the bracket from the balance beam and fix it to the embedded part.

4. The assembly method for the end sealing gate of the large-section immersed tube according to claim 3, characterized in that, In the step of installing the bracket to the upper chamfer of the pipe section using a balanced hoisting mechanism: Raise the side of the balance beam away from the upper chamfer so that the side of the bracket closest to the upper chamfer surface is against the surface of the upper chamfer. Stop operating the two hanging parts on the side of the balance beam away from the upper chamfer surface, and simultaneously pull the two hanging parts on the side of the balance beam closest to the upper chamfer surface to lower the side of the balance beam close to the upper chamfer until the surface of the bracket is parallel to the surface of the embedded part. Translate the balance beam to attach the bracket to the embedded part.

5. The assembly method for the end sealing gate of the large-section immersed tube according to claim 1, characterized in that, The steps for installing H-beams, specifically the hoisting and installation of the H-beams into the pipe section, are replaced by: A lifting cable is connected to the fishing point on the steel beam of the H-beam, and the lifting cable is connected to the hook of the crane; a first reference end, a second reference end, and a reference line are set on the H-beam; the two ends of the H-beam are respectively set as the first reference end and the second reference end; the reference line is the line connecting the first reference end and the second reference end, and the reference line passes through the center of gravity of the H-beam; the fishing point on the steel beam of the H-beam is located on one side of the reference line, and is simultaneously located between the center of gravity of the H-beam and the first reference end; The crane lifts the H-beam with its hook and stands it upright with the first reference end on top and the second reference end on the bottom, and the second reference end of the H-beam is closer to the end face of the pipe section than the first reference end. The crane moves the H-beam horizontally and attaches the lifting cable connected to the H-beam to the end steel shell installed on the end face of the pipe section, so that the second reference end portion of the H-beam extends into the pipe section, and the top surface inside the pipe section is higher than the position of the first reference end of the H-beam. A protective steel plate is installed on the inner edge of the lower part of the pipe section port, a hand chain hoist is installed on the bracket to connect the first reference end of the H-beam, and a hand chain hoist is installed on the lower support to connect the second reference end of the H-beam. Operate the hand-operated hoist installed on the lower support to pull the second reference end of the H-beam against the protective steel plate; Operate the hand-operated hoist installed on the bracket to pull the H-beam to rotate to a vertical position. The first reference end of the H-beam rises with the rotation of the H-beam and attaches to the top surface inside the pipe section. The second reference end of the H-beam rises with the rotation of the H-beam and enters the pipe section completely. Two hand-operated hoists are used simultaneously to push the first and second reference ends of the H-beam into the pipe section, so that the first and second reference ends of the H-beam are respectively attached to the bracket and the lower support.

6. The assembly method for the end sealing gate of the large-section immersed tube according to claim 1 or 5, characterized in that, The fishing point of the steel beam of the H-beam is located on the side surface of the H-beam.

7. The assembly method for the end sealing gate of the large-section immersed tube according to claim 1, characterized in that, In the panel installation process, the panel is hoisted onto the H-beam, and the specific steps are as follows: Connect a lifting cable to the fishing point on the panel, and connect the lifting cable to the hook of the crane; the fishing point on the panel is located between one end of the panel and the center of gravity of the panel; The crane lifts the panel using its hook and erects it. The crane moves the panel horizontally and attaches the lifting cable connected to the panel to the end steel shell installed on the end face of the pipe section; Two hand-operated hoists are installed on the H-beam and connected to both ends of the panel respectively. The two hand-operated hoists are operated simultaneously to pull the panel toward and attach it to the H-beam, and then the panel is welded to the H-beam.

8. The assembly method for the end sealing gate of the large-section immersed tube according to claim 7, characterized in that, A gap is provided between adjacent H-beams, and the hand chain hoist is connected to the panel through the gap between the H-beams; the panel is welded to two adjacent H-beams.

9. The assembly method for the end sealing gate of the large-section immersed tube according to claim 1, characterized in that, When one of the H-beams is installed, the installation of the next set of brackets and lower supports begins; after all brackets and lower supports are installed, the panel installation begins; the brackets, lower supports, and H-beams are installed sequentially from the middle of the pipe section to both sides.

10. The assembly method for the end sealing gate of the large-section immersed tube according to claim 1, characterized in that, The Ω-shaped water-stop steel plates are first installed one by one from the middle of the bottom of the pipe section to both sides, then one by one from both sides of the pipe section upwards simultaneously, and then one by one from both sides of the top of the pipe section towards the middle simultaneously.

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