Synchronous leak detection method for multiple sections of large-section inland river immersed tube in small dry dock

Abstract

The invention relates to the technical field of tunnel construction, and in particular to a method for synchronously detecting leaks of multiple sections of an inland river immersed tube with a large cross-section in a small dry dock. The method is suitable for a dry dock with at least three sections of immersed tubes, wherein the mooring posts at both ends of the first immersed tube are connected to the fairlead posts on the walls on both sides of the dry dock through a first cable, and the first cable does not pass through the tops of the second immersed tube and the third immersed tube; the mooring posts at the front end of the second immersed tube are connected to the mooring posts on one side of a dock door through a second cable, and the mooring posts at the rear end are connected to the fairlead posts on the wall on one side of the dry dock through a third cable, and the second and third cables do not pass through the tops of the first immersed tube and the third immersed tube; the mooring posts at both ends of the third immersed tube are connected to the winches on the side walls of the dry dock through a fourth cable, and the fourth cable does not pass through the tops of the first immersed tube and the second immersed tube; the method solves the technical problems of interference of cables on concrete layer pouring during the leak detection and floating process of multiple sections of immersed tubes in small and medium-sized dry docks in the prior art and reduction of underwater cable-carrying operations.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, and in particular to a multi-tube segment synchronous leakage detection method for a large-section inland river immersed tube in a small dry dock. Background Art

[0002] After the prefabrication of the immersed tube is completed, it is necessary to conduct leak detection on the immersed tube. The immersed tube without leaks will be floated out of the water for secondary outfitting, etc. In order to improve construction efficiency and make full use of the space in the dry dock, multiple sections of immersed tubes are prefabricated at the same time and leak detection and floating operations are carried out at the same time.

[0003] Chinese patent CN114809089A discloses a method for simultaneously undocking multiple immersed tubes. Three sections of immersed tubes with parallel axes are prefabricated in the dry dock. High-strength cables are used for temporary mooring to prevent the tube sections from colliding during subsequent leak detection and floating. However, the two sections of immersed tubes farther from the dock door have multiple high-strength cables across the tops of adjacent immersed tubes. When the freeboard is adjusted after the immersed tubes are floated, these cables across the tops of the immersed tubes will interfere with the pouring of the concrete layer. The interference of the cables will not only affect the uniformity and quality of the concrete, but may also cause damage to the concrete layer, thereby affecting the strength and durability of the entire immersed tube structure. In the prior art, a support frame needs to be set on the top of the immersed tube to support the cables to avoid interference with the pouring of the concrete layer. However, the design and installation of the support frame are complicated, and it needs to be dismantled later, which increases the difficulty and cost of construction.

[0004] For inland immersed tube tunnels with fewer pipe segments, all the pipe segments are generally prefabricated at the same time in the dry dock. These immersed tubes must be arranged closely to maximize the use of space. There are both immersed tubes parallel to the axis of the docking and immersed tubes perpendicular to the axis of the docking. The dock door is a disposable structure and cannot be reused. All immersed tubes need to be inspected for leaks and floated before the dock door is removed.

[0005] For large-section immersed tube segments in a small dry dock, how to ensure the temporary mooring stability of the immersed tube while avoiding the interference of cables on the pouring of the concrete layer and reducing underwater cable operations has become a technical problem in the existing technology. Summary of the invention

[0006] In view of the deficiencies in the above-mentioned prior art, the present invention provides a method for synchronous leak detection of multiple pipe sections of a large-section inland river immersed tube in a small dry dock, which does not require underwater cables and avoids interference of cables with concrete pouring.

[0007] The present invention provides a multi-tube synchronous leak detection method for a large-section inland river immersed tube in a small dry dock, which is applicable to a dry dock with at least three sections of immersed tubes, including a third immersed tube close to a dock door, whose immersed tube axis is colinear with the undocking axis, a second immersed tube located on one side of the third immersed tube and whose axis is parallel to the third immersed tube, and a first immersed tube far away from the dock door and whose axis is perpendicular to the third immersed tube and the second immersed tube. The leak detection method specifically comprises the following steps:

[0008] Cable on top of immersed tube:

[0009] The mooring posts at both ends of the first immersed tube are respectively connected to the fairleads on both side walls of the dry dock located at the front and rear ends of the first immersed tube through first cables, and the first cables do not pass through the tops of the second immersed tube and the third immersed tube;

[0010] The front mooring post of the second immersed tube close to the dock door is connected to the mooring post on one side of the dock door by a second cable, and the rear mooring post of the second immersed tube away from the dock door is connected to the guide post on the wall of the dry dock facing away from the third immersed tube by a third cable, and the second cable and the third cable do not pass through the top of the first immersed tube and the third immersed tube;

[0011] The mooring posts at both ends of the third immersed tube are respectively connected to the winches on the side walls of the dry dock using a plurality of fourth cables, and the fourth cables are adjusted in direction through a plurality of fairleads on the side walls of the dry dock so that the fourth cables do not pass through the tops of the first immersed tube and the second immersed tube;

[0012] Water filling leak detection:

[0013] Filling the dry dock with water, filling the ballast water systems of the first immersed tube, the second immersed tube and the third immersed tube with water, and simultaneously performing leak detection operations on the first immersed tube, the second immersed tube and the third immersed tube;

[0014] The pipe sections float up and sit on the bottom in turn:

[0015] After the leak detection is completed, the ballast water system is drained, floated, the anti-anchor layer on the top of the pipe is poured, and the bottom is placed in the order of the first immersed tube, the second immersed tube, and the third immersed tube;

[0016] Before draining the second and third immersed tubes, the third cable at the rear end of the second immersed tube and the fourth cables at the front and rear ends of the third immersed tube are firstly re-cabled so that the front and rear ends of the second immersed tube maintain force balance. The fourth cables are the connection mode of the third immersed tube when it is undocking.

[0017] After the dock door is broken open, the ballast water system of the third immersed tube is drained again to make it float, and the third immersed tube is winched out of the dock.

[0018] The technical scheme of the simultaneous leak detection method for multiple sections of large-section inland river immersed tubes in a small dry dock is to cable the immersed tubes before the dry dock is filled with water, thereby avoiding underwater cable-tying operations, ensuring the stability of the mooring of the immersed tubes and realizing simultaneous leak detection of multiple sections of immersed tubes, and the cables connecting the immersed tubes do not pass through the tops of adjacent immersed tubes, which will not interfere with the pouring of anti-anchor layers of subsequent immersed tubes after floating; the active bottom seating of the previous immersed tube after floating is carried out, which is convenient for the subsequent cable change, floating and pouring of anti-anchor layers of the immersed tubes, and can also avoid the passive bottom seating of the immersed tubes due to the lowering of the water level in the dry dock after the dock door is broken in the later stage, causing damage to the immersed tubes.

[0019] In some embodiments of the present application, when the second immersed tube floats and lands on the bottom, the third cable at the rear end of the second immersed tube is changed to be connected to the guide column of the dry dock side wall located at the rear end of the second immersed tube. After the change, the third cable is arranged crosswise. The third cable and the second cable work together to balance the force of the second immersed tube and float stably.

[0020] In some embodiments of the present application, when the top of the third immersed tube is cabled, the two sides of the front end of the third immersed tube are connected to the undocking winches located at the dry dock near the dock door, and the rear end of the immersed tube is connected to the brake winch located on the rear wall of the dry dock and the rear end position control winch located on the two side walls of the dry dock. The connection with the winches reduces the workload of underwater cable binding for the third immersed tube in the subsequent undocking process and improves work efficiency.

[0021] In some embodiments of the present application, the fourth cable comprises:

[0022] an undocking control cable connected to the undocking winch;

[0023] a brake cable connected to the brake winch;

[0024] a position control cable connected to the rear end position control winch;

[0025] When the third immersed tube is cabled on the top, the undocking control cable and the position control cable near the second immersed tube pass through a cable guide near the dock door and a cable guide post near a side wall of the dry dock of the second immersed tube, so that the undocking control cable and the position control cable do not pass through the top of the second immersed tube;

[0026] The brake cable passes through a fairlead on the other side wall of the dry dock away from the second immersed tube, so that the brake cable does not pass through the top of the first immersed tube.

[0027] In some embodiments of the present application, when the third immersed tube is floated and landed, during the process of cable-bearing the top of the immersed tube, the undocking control cable close to the second immersed tube is re-cabled so as to form an eight-shaped arrangement with the undocking control cable on the other side of the third immersed tube;

[0028] Rearranging the position control cable close to the second immersed tube so as to form an eight-shaped arrangement with the position control cable on the other side of the third immersed tube;

[0029] Changing the brake cables to a cross arrangement;

[0030] After the cable is changed, the undocking control cable, the position control cable and the brake cable are arranged in the same manner as the cables when the third immersed tube is undocking, and there is no need to change or modify the cables when the third immersed tube is undocking.

[0031] In some embodiments of the present application, during the water filling leak detection process, the first immersed tube, the second immersed tube, and the third immersed tube simultaneously perform low water level leak detection and high water level leak detection, and the ballast water system located in the pipe section is also leak detected during the process.

[0032] In some embodiments of the present application, when the submerged tube is floated, a water pump is used to pump out the ballast water in the ballast water system of the submerged tube. After the bottom of the tube is completely separated from the bottom of the dock, the drainage rate is accelerated evenly and symmetrically so that the submerged tube is in a fully floating state as soon as possible. When the ballast water is completely discharged, the anti-anchoring layer on the top of the tube is poured and the pipe sections are leveled. When the submerged tube is in a stable state, the freeboard values ​​of the four corner points of the pipe sections are measured. During the floating process, the ballast water is pumped out and enters the dry dock, and the ballast water is fully utilized to realize the floating of the submerged tube.

[0033] In some embodiments of the present application, after the submerged tube lands on the bottom, the cables connected thereto are in a relaxed state. When the submerged tube floats again, the ballast water in the ballast water bag is discharged and the cables are tightened.

[0034] In some embodiments of the present application, a siphon pumping system is used when filling the dry dock with water, and the water outside the dry dock uses the siphon principle to flow into the dry dock without the help of external force.

[0035] In some embodiments of the present application, the first cable, the second cable, and the third cable are nylon cables, and the fourth cable is a steel cable.

[0036] Based on the above technical scheme, the method for synchronously detecting leaks of multiple sections of large-section inland river immersed tubes in a small dry dock of the present invention is to carry out cable-carrying on the immersed tubes before the dry dock is filled with water, thereby avoiding underwater cable-carrying operation, ensuring the stability of the mooring of the immersed tubes and realizing simultaneous leak detection of multiple sections of immersed tubes, and the cables connecting the immersed tubes do not pass through the tops of adjacent immersed tubes, so as not to interfere with the subsequent pouring of anti-anchoring layers of the immersed tubes after floating;

[0037] The immersed tubes are placed on the bottom in sequence, and the active placement of the immersed tubes after floating is carried out, which is convenient for the subsequent cable modification, floating and pouring of the anti-anchor layer of the immersed tubes, and can also avoid the passive placement of the immersed tubes on the bottom due to the lowering of the water level in the dry dock after the dock door is broken in the later stage, which may cause damage to the immersed tubes;

[0038] The third immersed tube is connected to the winch via a steel cable, so there is no need to change the cable when it is undocking, which greatly reduces the workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0040] Figure 1 A diagram showing the position relationship of the first immersed tube, the second immersed tube, and the third immersed tube in the dry dock according to an embodiment of the present invention;

[0041] Figure 2 It is a schematic diagram of a pipe segment according to an embodiment of the present invention when being cabled on the top in a dry dock;

[0042] Figure 3 This is a schematic diagram of the cable belt when the second immersed tube is floating according to an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the cable when the third submerged tube is floating according to an embodiment of the present invention;

[0044] Figure 5 This is a schematic diagram of the cable belt when the third immersed tube is undocking according to an embodiment of the present invention;

[0045] In the figure, 10 is the first immersed tube; 20 is the second immersed tube; 30 is the third immersed tube. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0048] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] The method for synchronous leak detection of multiple sections of large-section inland river immersed tubes in a small dry dock in this embodiment is applicable to inland river immersed tube tunnels. The immersed tube tunnel is composed of three sections of immersed tubes. The dry dock is an axis dry dock, which is arranged on the south bank of the river. The axis of the dock door of the axis dry dock is colinear with the axis of the inland river immersed tube tunnel. The axis dry dock is a disposable dry dock, which cannot be reused after the dock door is broken. Three sections of immersed tubes are prefabricated in the dry dock.

[0051] As attached Figure 1 As shown, the three-section immersed tube includes a third immersed tube 30 close to the dock gate, and the axis of the immersed tube is colinear with the axis of the undocking; a second immersed tube 20 located on the east side of the third immersed tube 30 and the axis is parallel to the third immersed tube 30, and a first immersed tube 10 far away from the dock gate and the axis is perpendicular to the third immersed tube 30 and the second immersed tube 20. The first immersed tube is close to the south side of the dry dock, close to the south wall of the dry dock, and parallel to the south wall. The axes of the first immersed tube 10, the second immersed tube 20, and the third immersed tube 30 are in a П-shaped distribution with the opening facing right; in this embodiment, the length of the first immersed tube 10 is 108m, which is a long tube section with a length of 101m and a short tube section with a length of 7m pre-stretched, and there is a water stop between the long tube section and the short tube section; the second immersed tube 20 and the third immersed tube 30 are standard joints, and the length is 104m. The dry dock area is much smaller than the offshore dry dock area, covering an area of ​​65,000 m2, and the dry dock depth is the same, without the distinction between the deep dock area and the shallow dock area.

[0052] like Figure 2 As shown, there are 15 fairleads and 2 mooring posts in the axis dry dock, where D represents a fairlead and X represents a mooring post. Fairleads D3, D4, D5 and D6 are located on the east wall of the dry dock, fairleads D7 and D8 are located on the south wall of the dry dock, fairleads D9, D10, D11 and D12 are located on the west wall of the dry dock, fairleads D13, D14, D15, D2 and D1 are located on the north wall of the dry dock, i.e., close to the dock door, where D14 and D15 are located on both sides of the dock door; and mooring posts X1 and X2 are located on the inner side of the dock door.

[0053] There are also two undocking winches in the dry dock, namely the J2 winch and the J5 winch. In this embodiment, J2 is located on the east wall of the dry dock, and J5 is located on the west wall of the dry dock; two braking winches, namely the J3 winch and the J4 winch, in this embodiment, J3 and J4 are located on the south wall of the dry dock; two rear end position control winches, namely the J1 winch and the J6 winch, in this embodiment, J1 is located on the east wall of the dry dock, and J6 is located on the west wall of the dry dock; among them, the J5 and J6 winches are located on the west wall of the dry dock near the dock door.

[0054] The synchronous leak detection method of the first immersed tube 10, the second immersed tube 20, and the third immersed tube 30 specifically comprises the following steps:

[0055] Cable on top of immersed tube:

[0056] Continue to see Figure 2 The mooring posts at both ends of the first immersed tube 10 near the dock door are respectively connected to the guide posts on the two side walls of the dry dock located at the front and rear ends of the first immersed tube 10 through the first cables, and the first cables include nylon cables N1, N2, N3, and N4; the specific connection form is: the mooring post at the front end of the first immersed tube 10 is respectively connected to D9 and D11 on the west wall of the dry dock through nylon cables N1 and N2, and N1 and N2 are arranged crosswise; the mooring post at the rear end of the first immersed tube 10 is respectively connected to D6 and D4 on the east wall of the dry dock through nylon cables N3 and N4, and N3 and N4 are arranged crosswise; N1, N2, N3, and N4 do not pass through the top of the second immersed tube 20 and the third immersed tube 30;

[0057] The front mooring post of the second immersed tube 20 near the dock gate is connected to the mooring post on one side of the dock gate by a second cable, and the second cable includes nylon cables N7 and N8. The specific connection form is: the front mooring post of the second immersed tube 20 near the dock gate is connected to the mooring pile X2 on one side of the dock gate and D2 on the north side wall of the dry dock near the dock gate by nylon cables N7 and N8, and N7 and N8 are arranged in an eight-shaped pattern; the rear mooring post of the second immersed tube 20 away from the dock gate is connected to the guide post on one side wall of the dry dock away from the third immersed tube 30 by a third cable, and the third cable includes nylon cables N5 and N6. The specific connection form is: the rear mooring post of the second immersed tube 20 away from the dock gate is connected to D4 on the east side wall of the dry dock away from the third immersed tube 30 by nylon cables N5 and N6, as shown in FIG. Figure 2 As shown, nylon cables N5 and N6 pass through the top surface of the second immersed tube 20, nylon cables N7 and N8 are between the second immersed tube 20 and the side wall of the dry dock near the dock door, and nylon cables N5, N6, N7, and N8 do not pass through the top of the first immersed tube 10 and the third immersed tube 30;

[0058] The mooring posts at both ends of the third immersed tube 30 are respectively connected to the winches of each side wall of the dry dock using a plurality of fourth cables, and the fourth cables include undocking control cables L2 and L5, and position control cables L1 and L6; the specific connection form is: the mooring post on the west side of the front end of the third immersed tube 30 close to the dock door is connected to the undocking winch J5 on the west wall of the dry dock through the undocking control cable L5, and the undocking control cable L5 passes through D11 on the west wall of the dry dock, and the undocking control cable L5 is located between the west wall of the dry dock and the third immersed tube 30, and does not pass through the top of the first immersed tube 10 and the second immersed tube 20; the mooring post on the east side of the front end is connected to the undocking winch J2 on the east wall of the dry dock through the undocking control cable L2, and in order to avoid the undocking control cable L2 passing through the second immersed tube 20, the undocking control cable L2 passes through D15 on the east side of the dock door, D2 on the east wall of the dry dock close to the dock door, and D5 and D4 on the east wall of the dry dock away from the dock door in sequence, and then is connected to the undocking winch J2;

[0059] The mooring post on the west side of the rear end of the third immersed tube 30 away from the dock door is connected to the rear end position control winch J6 of the west wall of the dry dock through the position control cable L6. The position control cable L6 passes through D12 of the west wall of the dry dock. The position control cable L6 is located between the west wall of the dry dock and the third immersed tube 30, and does not pass through the top of the first immersed tube 10 and the second immersed tube 20; the mooring post on the east side of the rear end is connected to the rear end position control winch J1 of the east wall of the dry dock through the position control cable L1. In order to avoid the position control cable L1 passing through the top of the second immersed tube 20, the position control cable L1 passes through D15 on the east side of the dock door, D2, D3, and D1 of the east wall of the dry dock close to the dock door in sequence, and then is connected to the rear end position control winch J1;

[0060] In order to further reduce the underwater cable-carrying operation when the third immersed tube is undocking, the mooring post at the rear end of the third immersed tube 30 is connected to the brake winches J3 and J4 on the south wall of the dry dock through brake cables L3 and L4. In order to avoid the brake cables L3 and L4 passing through the top of the first immersed tube 10 and interfering with the floating of the first immersed tube 10 and the pouring of the later anti-anchor layer, the brake cable L3 passes through D11 on the west wall of the dry dock, D9 located at the position of the west wall close to the south wall, and D7 on the south wall, and then is connected to the brake winch J3; the brake cable L4 passes through D11 on the west wall of the dry dock, D9 located at the position of the west wall close to the south wall, and D8 on the south wall in sequence, and then is connected to the brake winch J4; Figure 2 As shown, the brake cables L3 and L4 are located at the west wall and the east wall of the dry dock, do not intersect with the first immersed tube, and do not pass through the top of the first immersed tube 10.

[0061] Water filling leak detection:

[0062] Before filling the dry dock with water, clean up the mechanical equipment, materials and sundries in the dock, check the sealing of the steel sealing door, manhole door and pipe top manhole, check whether the air inlet pipe and the inlet and outlet pipes of the immersed tube are blocked, check the ballast pipeline system, pipe adjustment system and oil pressure system, communication system, measurement and positioning system inside the pipe segment, and eliminate faults in time; check and confirm that all pipe systems, valves and instrument valves are in the closed state, tighten the cables of the first immersed tube 10, the second immersed tube 20 and the third immersed tube 30 to prevent displacement and damage after the pipe segment floats when the dock is filled with water.

[0063] Remove the flood walls on both sides of the dock entrance, reserve personnel passages and the location of the siphon system pipes. The siphon system pipes are made of 400mm diameter steel pipes, which are hoisted by a tower crane. Open the siphon system to fill the dry dock with water and perform leak detection steps;

[0064] Leakage detection at low water level: Fill the dry dock with water until the first immersed tube 10, the second immersed tube 20, and the third immersed tube 30 are immersed in water to a depth of 5m, and add water to the ballast water bags inside the immersed tubes evenly, symmetrically, and step by step until the water level reaches 3m, then stop filling water. Check the water tightness of the water tank and both sides within 3m inside the pipe section. Check the leakage of the lower half of the immersed tube and the bottom of the steel sealing door, the watertight door, the bottom of the immersed tube, and the side wall of the submerged structure outside the pipe section. Check whether there are any foreign objects at the connection of the waterstop at the lower half of the long pipe section and the short pipe section of the first immersed tube 10, and check whether the waterstop has turned over and whether the connection is tight; The duration is not less than 24 hours; in this embodiment, there is only one control system for controlling the injection of the ballast water system. After the ballast water bag inside the third immersed tube 30 is filled with water to 3m, the control system installed in the third immersed tube 30 is removed and then installed on the ballast water system of the second immersed tube 20 to inject water into the ballast water system of the second immersed tube; when the ballast water bag inside the second immersed tube 20 is filled with water to 3m, the control system installed in the second immersed tube 20 is removed and then installed on the ballast water system of the first immersed tube 10 to inject water into the ballast water system of the first immersed tube 10;

[0065] High water level leak detection: After the low water level leak detection is completed, continue to fill the dry dock with water to 0.5m above the top surface of the pipe segment, and add water to the ballast water bag in the pipe segment evenly, symmetrically and step by step until the water level reaches 4.5m, then stop filling water. Perform a comprehensive leak detection of the ballast water bag in the pipe segment under full load. Check the leakage of the pipe segment concrete and steel sealing door as a whole, and check whether there are foreign objects at the waterstop connection where the long pipe segment and the short pipe segment of the first immersed tube 10 are pulled together, and check whether the waterstop has turned over and whether the connection is tight. The duration shall not be less than 24 hours;

[0066] The submerged tube leak detection process is carried out simultaneously with the leak detection and debugging of the ballast water system inside the submerged tube;

[0067] The pipe sections float up and sit on the bottom in turn:

[0068] After the leak detection of the first immersed tube 10, the second immersed tube 20, and the third immersed tube 30 is completed, the water level outside the immersed tube is higher than the ballast water level inside the tube. First, the ballast water system of the first immersed tube 10 is drained. Before draining, the operator needs to observe and inspect all pipe systems, water tanks, etc., and after checking that there is no abnormality, the pump operator checks the water pump and prepares to start the water pump. As the amount of water in the water tank decreases, the buoyancy state of the immersed tube changes from negative buoyancy to positive buoyancy. After the bottom of the tube is completely separated from the bottom of the dock, the drainage rate should be evenly and symmetrically accelerated to make the pipe section in a fully floating state as soon as possible. After floating, the anti-anchor layer on the top of the pipe is poured and the pipe section is leveled. The freeboard values ​​of the four corner points of the pipe section are measured in a stable state. After the anti-anchor layer on the top of the first immersed tube 10 is solidified, the ballast water system of the first immersed tube 10 is filled with water again to make the first immersed tube 10 sit on the bottom, and the nylon cables N1, N2, N3, and N4 are in a relaxed state.

[0069] After the first immersed tube 10 is seated, the nylon cables N5 and N6 at the rear end of the second immersed tube 20 are re-cabled. Figure 3 As shown, the nylon cable N6 is changed from D4 to D6 located on the south wall of the dry dock, and the nylon cable N5 is changed from D4 to D8 located on the east side of the south wall of the dry dock. The changed nylon cables N5 and N6 are arranged crosswise, which can keep the rear end of the second immersed tube 20 stable, and the nylon cables N7 and N8 at the front end of the second immersed tube 20 remain unchanged, so that the front and rear ends of the second immersed tube maintain force balance;

[0070] Then the ballast water system of the second immersed tube 20 is drained. When the second immersed tube 20 floats, the anti-anchor layer on the top of the tube is poured and the tube section is leveled. The freeboard values ​​of the four corner points of the tube section are measured in a stable state. After the anti-anchor layer on the top of the second immersed tube 20 is solidified, the ballast water system of the second immersed tube 10 is filled with water again so that the second immersed tube 20 is seated on the bottom, and the nylon cables N5, N6, N7, and N8 are in a relaxed state.

[0071] After the second immersed tube 20 is seated, the positions of the fairleads of the undocking control cable L2, the position control cable L1, and the brake cables L3 and L4 of the third immersed tube 30 are replaced so that the above cables are all connected when the third immersed tube 30 is undocking, such as Figure 4 As shown, specifically:

[0072] The connection between the undocking control cable L2 and D15 and D2 is released. The undocking control cable L2 passes through D5 and D4 on the east wall of the dry dock, away from the dock gate, and then connects to the undocking winch J2. After the cable change, the undocking control cable L2 and the undocking control cable L5 are arranged in an eight-shaped pattern; the connection between the position control cable L1 and D15 and D2 is released. The undocking control cable L2 passes through D3 and D1 on the east wall of the dry dock, close to the dock gate, and then connects to the rear position winch J1. After the cable change, the position control cable L1 and the position control cable L6 are arranged in an eight-shaped pattern; the brake cable is released. The connection between L3 and D11 and D9, the brake cable L3 passes through D7 on the south wall of the dry dock and then is connected to the brake winch J3, the connection between the brake cable L4 and D11 is released, the brake cable L3 passes through D9 at the position of the south wall of the west wall of the dry dock and D8 on the south wall and then is connected to the brake winch J4, and the brake cables L3 and L4 after the cable change are arranged crosswise; the undocking control cables L2 and L5 after the cable change and the position control cables L1 and L6, the brake cables L3 and L4 keep the front and rear ends of the third immersed tube 30 under force balance;

[0073] Then the ballast water system of the third immersed tube 30 is drained. When the third immersed tube 30 floats, the anti-anchor layer on the top of the tube is poured and the pipe section is leveled. The freeboard values ​​of the four corner points of the pipe section are measured in a stable state. After the anti-anchor layer on the top of the third immersed tube 30 is solidified, the ballast water system of the third immersed tube 30 is filled with water again so that the third immersed tube 30 sits on the bottom, and the undocking control cables L2 and L5, the position control cables L1 and L6, and the brake cables L3 and L4 are in a relaxed state. During the floating process of the immersed tube, the ballast water is pumped out and enters the dry dock, so that the ballast water is fully utilized to realize the floating of the immersed tube, and there is no need to use a siphon system to fill the dry dock with water from the outside.

[0074] After the dock door is removed, the water level in the dry dock may drop. At this time, the first immersed tube 10, the second immersed tube 20, and the third immersed tube 30 are all in the bottom state, which will not affect it. Then, the ballast water system of the third immersed tube 30 is drained again to make it float. Figure 5 As shown, the mooring post at the front end of the third immersed tube 30 is connected to the traction winch J9 on the other side of the river channel through the traction cable L9. When the window period arrives, the third immersed tube 30 is winched out of the dock while maintaining the above-mentioned cable state.

[0075] In this embodiment, the cables connected to the first immersed tube 10 and the second immersed tube 20 are all nylon cables, and the brake cables L3, L4, position control cables L1, L6, and brake cables L3, L4 connected to the third immersed tube 30 are all steel cables. When the third immersed tube 30 is winched out of the dock, there is no need to change cables, reducing underwater cable operations.

[0076] The method for synchronously detecting leaks of multiple sections of a large-section inland river immersed tube in a small dry dock of this embodiment is to carry out cable-carrying before the dry dock is filled with water, thereby avoiding underwater cable-carrying operation, ensuring the stability of the mooring of the immersed tube and realizing simultaneous leak detection of multiple sections of immersed tubes, and the cables connecting the immersed tubes do not pass through the tops of adjacent immersed tubes, so as not to interfere with the subsequent pouring of anti-anchoring layers of each immersed tube after floating;

[0077] The first immersed tube 10, the second immersed tube 20, and the third immersed tube 30 are sequentially floated and seated on the bottom, which is convenient for the subsequent cable modification, floating and pouring of the anti-anchor layer of the immersed tubes, and can also avoid the passive seating of the immersed tubes due to the lowering of the water level in the dry dock after the dock door is broken in the later stage, which may cause damage to the immersed tubes;

[0078] The third immersed tube 30 is connected to the winch via a steel cable, and there is no need to change the cable when undocking, which greatly reduces the workload and underwater cable operations.

[0079] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0080] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A method for synchronously detecting leaks of multiple sections of a large-section inland river immersed tube in a small dry dock, which is applicable to a dry dock with at least three sections of immersed tubes, including a third immersed tube close to a dock door, whose immersed tube axis is colinear with the undocking axis, a second immersed tube located on one side of the third immersed tube and whose axis is parallel to the third immersed tube, and a first immersed tube far from the dock door and whose axis is perpendicular to the third immersed tube and the second immersed tube. The method for detecting leaks specifically comprises the following steps: Cable on top of immersed tube: The mooring posts at both ends of the first immersed tube are respectively connected to the fairleads on both side walls of the dry dock located at the front and rear ends of the first immersed tube through first cables, and the first cables do not pass through the tops of the second immersed tube and the third immersed tube; The front mooring post of the second immersed tube close to the dock door is connected to the mooring post on one side of the dock door by a second cable, and the rear mooring post of the second immersed tube away from the dock door is connected to the guide post on the wall of the dry dock facing away from the third immersed tube by a third cable, and the second cable and the third cable do not pass through the top of the first immersed tube and the third immersed tube; The mooring posts at both ends of the third immersed tube are respectively connected to the winches on the side walls of the dry dock using a plurality of fourth cables, and the fourth cables are adjusted in direction through a plurality of fairleads on the side walls of the dry dock so that the fourth cables do not pass through the tops of the first immersed tube and the second immersed tube; Water filling leak detection: Filling the dry dock with water, filling the ballast water systems of the first immersed tube, the second immersed tube and the third immersed tube with water, and simultaneously performing leak detection operations on the first immersed tube, the second immersed tube and the third immersed tube; The pipe sections float up and sit on the bottom in turn: After the leak detection is completed, the ballast water system is drained, floated, the anti-anchor layer on the top of the pipe is poured, and the bottom is placed in the order of the first immersed tube, the second immersed tube, and the third immersed tube; Before draining the second and third immersed tubes, the third cable at the rear end of the second immersed tube and the fourth cables at the front and rear ends of the third immersed tube are firstly re-cabled so that the front and rear ends of the second immersed tube maintain force balance. The fourth cables are the connection mode of the third immersed tube when it is undocking. After the dock door is broken, the ballast water system of the third immersed tube is drained again to make it float, and the third immersed tube is winched out of the dock; When the second immersed tube floats and sits on the bottom, the third cable at the rear end of the second immersed tube is changed to be connected to the guide column on the dry dock side wall located at the rear end of the second immersed tube. After the change, the third cable is arranged crosswise, and the third cable and the second cable work together to balance the force on the second immersed tube.

2. The method for synchronous leak detection of multiple pipe sections of a large-section inland river immersed pipe in a small dry dock according to claim 1 is characterized in that: When the third immersed tube is cabled on the top, the two sides of the front end of the third immersed tube are connected to the undocking winches located at the dry dock near the dock door, and the rear end of the immersed tube is connected to the brake winch located on the rear wall of the dry dock and the rear end position control winch located on the two side walls of the dry dock.

3. The method for synchronous leak detection of multiple pipe sections of a large-section inland river immersed pipe in a small dry dock according to claim 2 is characterized in that: The fourth cable comprises: an undocking control cable connected to the undocking winch; a brake cable connected to the brake winch; a position control cable connected to the rear end position control winch; When the third immersed tube is cabled on the top, the undocking control cable and the position control cable near the second immersed tube pass through the fairleading column near the dock door and the fairleading column near the dry dock side wall of the second immersed tube, so that the undocking control cable and the position control cable do not pass through the top of the second immersed tube; The brake cable passes through a fairlead on the other side wall of the dry dock away from the second immersed tube, so that the brake cable does not pass through the top of the first immersed tube.

4. The method for synchronous leak detection of multiple pipe sections of a large-section inland river immersed pipe in a small dry dock according to claim 3 is characterized in that: When the third immersed tube is floating and resting on the bottom, during the process of cable-carrying the top of the immersed tube, the undocking control cable close to the second immersed tube is re-cabled so as to form an eight-shaped arrangement with the undocking control cable on the other side of the third immersed tube; Rearranging the position control cable close to the second immersed tube so as to form an eight-shaped arrangement with the position control cable on the other side of the third immersed tube; Changing the brake cables to a cross arrangement; After the cable is changed, the undocking control cable, the position control cable and the brake cable are all the cable arrangements when the third immersed tube is undocking, and there is no need to change cables or modify cables when the third immersed tube is undocking.

5. The method for synchronous leak detection of multiple pipe sections of a large-section inland river immersed pipe in a small dry dock according to claim 1 is characterized in that: During the water filling leak detection process, the first immersed tube, the second immersed tube, and the third immersed tube simultaneously perform low water level leak detection and high water level leak detection, and during the leak detection process, the ballast water system located in the pipe section is also leak detected.

6. The method for synchronous leak detection of multiple pipe sections of a large-section inland river immersed pipe in a small dry dock according to claim 1 is characterized in that: When the submerged tube is floating, a water pump is used to pump out the ballast water in the ballast water system of the submerged tube. After the bottom of the tube is completely separated from the bottom of the dock, the drainage rate is accelerated evenly and symmetrically to make the submerged tube fully floating as soon as possible. When the ballast water is completely discharged, the anti-anchor layer on the top of the tube is poured and the pipe section is leveled. The freeboard values ​​of the four corner points of the pipe section are measured when the submerged tube is in a stable state.

7. The method for synchronous leak detection of multiple pipe sections of a large-section inland river immersed pipe in a small dry dock according to claim 1 is characterized in that: After the submerged tube sits on the bottom, the cables connected to it are in a relaxed state. When the submerged tube floats again, the ballast water in the ballast water bag is discharged and the cables are tightened.

8. The method for synchronous leak detection of multiple pipe sections of a large-section inland river immersed pipe in a small dry dock according to claim 1 is characterized in that: A siphon pumping system is used when filling the dry dock with water, and the water outside the dry dock flows into the dry dock without the help of external force using the siphon principle.

9. The method for synchronous leak detection of multiple sections of a large-section inland river immersed tube in a small dry dock according to claim 1, wherein the first cable, the second cable and the third cable are nylon cables, and the fourth cable is a steel cable.

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