Immersed tube joint SPMT vehicle floating-state barge-up construction method

Abstract

The invention relates to an immersed tube section SPMT vehicle floating-state barge-up construction method, which comprises the following steps: after a reinforced concrete immersed tube section is prefabricated, arranging an SPMT vehicle below the immersed tube section, arranging distribution beams on the SPMT vehicle, enabling the distribution beams to be distributed at intervals along the longitudinal direction of the immersed tube section, enabling the distribution beams to be transversely arranged along the immersed tube section, and then arranging first cushion blocks on the distribution beams, according to the invention, the distribution beam is provided with the corresponding first cushion blocks below the middle wall and the side wall of the immersed tube joint, the supporting force of the SPMT vehicle is distributed to the first cushion blocks through the distribution beam, and the supporting force is transmitted to the side wall and the middle wall of the immersed tube joint through the first cushion blocks, so that more SPMT vehicles can be arranged below the immersed tube joint, and the service life of the immersed tube joint is prolonged. The overall bearing capacity of the SPMT vehicle is larger than or equal to the overall load of the immersed tube joint, the distribution beam and the first cushion block, the transportation requirement is met, the situation that transportation cracking of the immersed tube joint is caused due to the fact that the SPMT vehicle is not located below the side wall and the middle wall of the immersed tube joint is avoided, and the SPMT vehicle can be used for carrying out barge transportation on the immersed tube joint.

Description

Technical Field

[0001] The present invention relates to the technical field of floating transfer of a submerged tube segment SPMT vehicle, and in particular to a construction method for floating transfer of a submerged tube segment SPMT vehicle. Background Art

[0002] In the prior art, for a reinforced concrete immersed tube segment, when it is moved from the dock to a semi-submersible barge, it is necessary to set up a row of transport trolleys under the side walls and the middle wall of the immersed tube segment. However, the adjustment stroke of the support height of the transport trolley is small and the adaptive ability is poor, which is not conducive to crack control during the barge process. The SPMT vehicle has a large-stroke adaptive adjustment ability and walking flexibility. Compared with the use of a transport trolley, the use of the SPMT vehicle can reduce the difficulty of crack control of the immersed tube segment during the floating barge process.

[0003] However, the use of SPMT vehicles will face new technical problems:

[0004] The SPMT vehicle has a small carrying capacity and a large size, while the immersed tube segment is heavy, so more SPMT vehicle groups are needed, which basically need to be fully laid under the immersed tube segment. However, the existing immersed tube segment is designed only based on operational requirements, and its supporting area is small. It can only be supported on the bottom plate corresponding to the middle wall and side wall area. The SPMT vehicle group cannot be arranged to support the bottom plate corresponding to the area between the middle wall and the side wall. The SPMT vehicle group is only laid on the bottom plate corresponding to the middle wall and side wall area, which makes the SPMT vehicle group unable to meet the carrying conditions, and thus the SPMT vehicle cannot be used to transport the immersed tube segment. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art of reinforced concrete immersed tube segments, in which the SPMT vehicle group can only be laid on the bottom plate corresponding to the middle wall and side wall areas of the immersed tube segment, and the bearing conditions cannot be met, and thus the SPMT vehicle cannot be used to transport the immersed tube segment. A floating barge construction method for the immersed tube segment SPMT vehicle is provided.

[0006] The present invention provides a construction method for floating barge of a submerged tube segment SPMT vehicle, comprising the following steps:

[0007] S1: After the reinforced concrete immersed tube segment is prefabricated, the SPMT vehicle is laid under the immersed tube segment, so that the SPMT vehicles are arranged in a row in the longitudinal direction of the immersed tube segment and are arranged symmetrically in the transverse direction; then a distribution beam is arranged on the movable part on the top of the SPMT vehicle, so that the distribution beams are distributed at intervals in the longitudinal direction of the immersed tube segment, and the distribution beams are arranged in the transverse direction of the immersed tube segment; then a first pad is arranged on the distribution beam, so that the distribution beam is provided with corresponding first pads under the middle wall and side wall of the immersed tube segment; wherein the overall bearing capacity of the SPMT vehicle is greater than or equal to the overall load of the immersed tube segment, the distribution beam and the first pad;

[0008] S2: The SPMT vehicle supports the hydraulic cylinder to rise, so that the first cushion block is supported on the bottom of the immersed tube segment, and the immersed tube segment is separated from the fixed pier;

[0009] S3: Use the SPMT vehicle to transfer the immersed tube segment from the dock surface to the semi-submersible barge;

[0010] S4: The SPMT vehicle supports the hydraulic cylinder to descend, so that the distribution beam falls to the support on the ship in the semi-submersible barge;

[0011] S5: The SPMT car supports the hydraulic cylinder to continue to descend, so that the SPMT car does not contact the bottom surface of the distribution beam;

[0012] S6: The SPMT vehicle reverses from the semi-submersible barge back to the dock surface, and the barge loading construction is completed.

[0013] The construction method for floating barge of an SPMT vehicle for a immersed tube segment of the present invention comprises the following steps: after the reinforced concrete immersed tube segment is prefabricated, an SPMT vehicle is arranged below the immersed tube segment, a distribution beam is arranged on the SPMT vehicle, so that the distribution beam is distributed at intervals along the longitudinal direction of the immersed tube segment, and the distribution beam is arranged transversely along the immersed tube segment, and a first pad is arranged on the distribution beam, so that the distribution beam is provided with corresponding first pads below the middle wall and the side wall of the immersed tube segment, the supporting force of the SPMT vehicle is distributed to the first pad through the distribution beam, and is transmitted to the side wall and the middle wall of the immersed tube segment by the first pad. , thereby enabling more SPMT vehicles to be arranged under the immersed tube segment, so that the overall bearing capacity of the SPMT vehicle is greater than or equal to the overall load of the immersed tube segment, the distribution beam and the first pad, meeting the transportation requirements, and the immersed tube segment will not be cracked during transportation because the SPMT vehicle is not under the side wall and the middle wall of the immersed tube segment. This method enables the use of SPMT vehicles to meet the bearing conditions, so that the SPMT vehicle can be used to transport the immersed tube segment by barge. Compared with the prior art using a transport trolley, the difficulty of controlling the cracking of the immersed tube segment during the floating barge process can be reduced.

[0014] Before step S1, the design steps of distributing the cross-sectional shape, structural dimensions and the number of beams uniformly arranged along the longitudinal direction of the immersed tube segment are also included:

[0015] 1) Preliminarily plan the cross-sectional shape and structural dimensions of the distribution beams, and preliminarily determine the number of distribution beams to be evenly arranged along the longitudinal direction of the immersed tube segment;

[0016] 2) Use the mechanical model to calculate the deformation and force of the distribution beam;

[0017] 3) When the force on the distribution beam meets the preset stress requirements, and the difference in the deformation displacement of the distribution beam at the four first pads above the distribution beam is within 2 mm, the first design of the distribution beam is completed; when the force on the distribution beam does not meet the preset stress requirements, or the difference in the deformation displacement of the distribution beam at the four first pads above the distribution beam is greater than 2 mm, the cross-sectional shape and structural dimensions of the distribution beam are adjusted, or the number of distribution beams is evenly arranged along the longitudinal direction of the immersed tube segment, and then the mechanical model is used to calculate the deformation and force of the distribution beam, and step 3) is repeated until the first design of the distribution beam is completed;

[0018] 4) Based on the distribution beam designed for the first time, a finite element model of the SPMT vehicle transporting the immersed tube segment through the distribution beam and the first pad is established. The finite element model is used to analyze whether the stress of the immersed tube segment meets the crack control requirements. If the stress of the immersed tube segment meets the crack control requirements, the distribution beam design is completed; if the stress of the immersed tube segment does not meet the crack control requirements, the cross-sectional shape and structural dimensions of the distribution beam are adjusted, or the number of distribution beams uniformly arranged along the longitudinal direction of the immersed tube segment is repeated, and steps 2) to 4) are repeated until the stress of the immersed tube segment meets the crack control requirements and the distribution beam design is completed.

[0019] The distribution beam will deform under the load of the SPMT vehicle, which will cause differences in the supporting force of the first pad and affect the stress state of the immersed tube segment. A special design is carried out for the distribution beam to determine the cross-sectional shape, structural dimensions and the number of distribution beams arranged longitudinally along the immersed tube segment to ensure that the supporting force of the first pad is basically equal, thereby reducing the influence of the deformation of the distribution beam under the load of the SPMT vehicle on the stress state of the immersed tube segment, making the stress of the immersed tube segment more uniform and reducing the possibility of cracking of the immersed tube segment.

[0020] Preferably, before step S1, the steps of obtaining the laying position of the SPMT vehicle below the immersed tube segment are as follows:

[0021] Determine the preset position range of the onboard supports on the semi-submersible barge used to support the immersed tube segments and the fixed piers during prefabrication of the immersed tube segments, and exclude the lateral position of the immersed tube segments when the SPMT vehicles are used to transport the immersed tube segments based on the preset position range of the onboard supports and the fixed piers; then determine the number of required SPMT vehicles based on the weight of the immersed tube segments; and then obtain all layout position points of the required SPMT vehicles corresponding to the immersed tube segments based on the number of required SPMT vehicles and excluding the lateral position of the SPMT vehicles when transporting the immersed tube segments.

[0022] The lateral position of the SPMT vehicle at the prestressed immersed tube segment is offset with the lateral position of the prestressed immersed tube segment corresponding to the fixed pier, so that after the prestressed immersed tube segment is prefabricated, the SPMT vehicle can be arranged below the prefabricated prestressed immersed tube segment to achieve force conversion between the fixed pier and the SPMT vehicle; and the lateral position of the SPMT vehicle at the prestressed immersed tube segment is offset with the lateral position of the prestressed immersed tube segment corresponding to the support on the ship, so that the SPMT vehicle can transport the prestressed immersed tube segment from the dock to the semi-submersible barge without being disturbed by the support on the ship, and then the prestressed immersed tube segment can be converted from the support of the SPMT vehicle to the support on the ship.

[0023] Preferably, before step S1, the method further includes the following steps:

[0024] Fixed piers are arranged in longitudinal rows and transverse rows in the prefabrication plant, and each row of fixed piers corresponds to the side wall or middle wall of the immersed tube segment to be prefabricated, and reinforced concrete immersed tube segments are prefabricated above the fixed piers.

[0025] It can complete the prefabrication of immersed tube segments and provide conditions for the SPMT vehicle to enter under the prefabricated immersed tube segments.

[0026] Preferably, the layout position of the fixed pier in the prefabrication plant is determined according to the layout position point of the SPMT vehicle, so that the lateral position of the SPMT vehicle at the prestressed immersed tube segment is staggered with the lateral position of the prestressed immersed tube segment corresponding to the fixed pier, so that after the prestressed immersed tube segment is prefabricated, the SPMT vehicle can be arranged under the prefabricated prestressed immersed tube segment, thereby realizing the force conversion between the fixed pier and the SPMT vehicle.

[0027] Preferably, the fixed pier includes a lower steel pier and an upper second pad, the height of the steel pier is between the minimum height and the driving height of the SPMT vehicle, the total height of the fixed pier is greater than the sum of the minimum height of the SPMT, the height of the distribution beam, and the height of the first pad, and the total height of the fixed pier is less than the sum of the driving height of the SPMT, the height of the distribution beam, and the first pad.

[0028] Ensure that the SPMT vehicle can smoothly drive to the bottom plate of the prefabricated immersed tube section and place the distribution beam and the first pad on it; ensure that after the SPMT vehicle is lifted, the second pad above the steel pier can be smoothly removed; ensure that the SPMT vehicle can move smoothly during the transportation of the immersed tube section without being affected by the steel pier.

[0029] Preferably, a first template is provided on the top of the fixed pier;

[0030] It also includes an auxiliary buttress, a second template is provided on the top of the auxiliary buttress, the second template and the first template can be spliced ​​into a bottom template of the immersed tube section, and the auxiliary buttress can adjust the height of the second template;

[0031] The following steps are also included:

[0032] The auxiliary piers are arranged in longitudinal rows and transverse rows in the prefabrication plant, so that the auxiliary piers and the fixed piers are staggered in the transverse direction, and the second formwork and the first formwork are spliced ​​to form the bottom formwork of the immersed tube segment, and then the steel cage is tied and concrete is poured above the bottom formwork to form the immersed tube segment;

[0033] After the prefabrication of the immersed tube segment is completed, the connection of the second formwork is released, and then the height of the second formwork is lowered by the auxiliary piers, and the auxiliary piers and the second formwork are removed.

[0034] Auxiliary piers cannot be used as the main supporting area. The purpose of auxiliary piers is to ensure that the bottom plate surface tends to be horizontal. The supporting force should be set relatively small, which is conducive to controlling cracks during the prefabrication of immersed tube segments.

[0035] Preferably, before step S3, the semi-submersible barge is stern-toed and moored to the side of the quay by cables; then a 40mm-50mm thick steel plate is laid at the joint between the quay and the semi-submersible barge; and then the onboard support is arranged on the deck of the semi-submersible barge; wherein the lateral arrangement position of the onboard support on the semi-submersible barge is determined according to the arrangement position point of the SPMT vehicle, and the onboard support is a continuous structure in the longitudinal direction of the semi-submersible barge.

[0036] After the semi-submersible barge is stern-to-side and moored to the dock by cables, 40mm-50mm thick steel plates are laid to meet the requirements of the SPMT vehicle for barge-in, and then shipboard supports are arranged on the deck of the semi-submersible barge. When there is an error in the mooring of the semi-submersible barge, the shipboard supports are arranged later to ensure that the shipboard supports will not interfere with the movement of the SPMT vehicle for barge-in, thus overcoming the interference caused by the mooring error of the semi-submersible barge. The shipboard supports are continuous structures in the longitudinal direction of the semi-submersible barge, which can ensure that after the SPMT vehicle transports the immersed tube segment to the semi-submersible barge, even if there is a longitudinal error, the distribution beam can still be placed on the shipboard supports, thereby reducing the difficulty of pier alignment.

[0037] Preferably, 8 rows of shipboard supports are arranged at intervals laterally on the semi-submersible barge, of which 4 rows of shipboard supports correspond to the two side walls and two middle walls of the immersed tube segment, and the other 4 rows of shipboard supports are located between two adjacent rows of SPMT vehicles. The shipboard supports distributed laterally along the semi-submersible barge are symmetrically arranged about the longitudinal center axis of the immersed tube segment.

[0038] Preferably, in step S3, in a preselected operation window, the submerged tube segment is moved from the dock to the semi-submersible barge by the SPMT vehicle;

[0039] During the barge loading process, the barge loading speed is controlled within 0.5m / min to 1m / min, and the load is adjusted through the semi-submersible barge ballast tank to control the height difference between the dock surface and the stern deck surface and the buoyancy of the semi-submersible barge to meet the control requirements of the SPMT vehicle movement and the stability and safety of the semi-submersible barge.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] The present invention provides a floating barge construction method for an SPMT vehicle of an immersed tube segment. After the reinforced concrete immersed tube segment is prefabricated, an SPMT vehicle is arranged below the immersed tube segment, and a distribution beam is arranged on the SPMT vehicle, so that the distribution beam is distributed at intervals along the longitudinal direction of the immersed tube segment, and the distribution beam is arranged transversely along the immersed tube segment, and then a first pad is arranged on the distribution beam, so that the distribution beam is provided with corresponding first pads below the middle wall and side wall of the immersed tube segment, and the supporting force of the SPMT vehicle is distributed to the first pad through the distribution beam, and is transmitted to the side wall and middle wall of the immersed tube segment by the first pad. The wall is located at the bottom of the immersed tube segment, so that more SPMT vehicles can be arranged under the immersed tube segment, so that the overall bearing capacity of the SPMT vehicle is greater than or equal to the overall load of the immersed tube segment, the distribution beam and the first pad, meeting the transportation requirements, and the immersed tube segment will not be cracked during transportation because the SPMT vehicle is not under the side wall and the middle wall of the immersed tube segment. This method enables the use of SPMT vehicles to meet the bearing conditions, so that the SPMT vehicles can be used to transport the immersed tube segment by barge. Compared with the prior art using a transport trolley, the difficulty of controlling the cracking of the immersed tube segment during the floating barge process can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the forces acting on the prefabricated immersed tube segment when supported by fixed piers and auxiliary piers;

[0043] Figure 2 It is a schematic diagram of the forces acting on the immersed tube segment when supported by the SPMT vehicle;

[0044] Figure 3 This is a schematic diagram of the prefabricated immersed tube segment;

[0045] Figure 4 The detailed drawing of the fixed piers and auxiliary piers during prefabrication;

[0046] Figure 5 Schematic diagram of removing the second formwork from the bottom surface of the prefabricated immersed tube section for auxiliary piers;

[0047] Figure 6 This is a longitudinal schematic diagram of the SPMT vehicle transporting immersed tube segments;

[0048] Figure 7 Schematic diagram of the lateral arrangement of the shipboard support and the SPMT vehicle in the immersed tube segment;

[0049] Figure 8 To set the reaction diagram of the SPMT vehicle support when distributing the beam;

[0050] Fig. 9 is the displacement diagram of immersed tube segment;

[0051] Fig.10 is the support force diagram of the first pad;

[0052] Fig.11 is the stress diagram of the immersed tube segment;

[0053] Figure 12-Figure 15 Schematic diagram of the SPMT vehicle transporting immersed tube segments from the dock to the semi-submersible barge;

[0054] Fig.16 This is a schematic diagram of fixing the immersed tube segment in a semi-submersible barge;

[0055] Fig.17 This is a transverse schematic diagram of the immersed tube segment after it is dropped into the semi-submersible barge;

[0056] Fig.18 This is the force analysis diagram of the distributed beam.

[0057] Markings in the figure: 1. immersed tube segment; 11. side wall; 12. middle wall; 13. bottom plate; 21. fixed pier; 211. rigid pier; 212. second pad; 213. first formwork; 22. auxiliary pier; 221. second formwork; 3. SPMT vehicle; 31. distribution beam; 32. first pad; 4. shipboard support; 5. semi-submersible barge; 51. bottom steel support; 6. wharf. DETAILED DESCRIPTION

[0058] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0059] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all based on the expression of the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0060] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0061] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0062] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0063] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0064] Example 1

[0065] In order to meet the requirements of crack control of immersed tube segment 1 during the barge-in process, the control requirements for the supporting force are as follows:

[0066] During the processes of prefabricating the immersed tube segment 1, transporting the immersed tube segment 1 from the dock 6 to the semi-submersible barge 5, and supporting the immersed tube segment 1 in the semi-submersible barge 5, the side walls 11 and the middle wall 12 are the main supporting areas (4 supporting areas), and it is necessary to ensure that the supporting forces of the 4 supporting areas are basically equal.

[0067] The existing technology supports 4 support areas through a transport trolley and transports them. However, the support height of the transport trolley has a small adjustment stroke and poor adaptability, which is not conducive to crack control during the barge loading process. The existing SPMT vehicle 3 has a large stroke adaptability and is flexible in walking. It can reduce the control requirements for the height difference between the dock 6 and the deck surface of the semi-submersible barge 5 and the floating state of the semi-submersible barge 5 during the barge loading process, and can reduce the difficulty of the barge loading construction. However, compared with the transport trolley support system, the SPMT vehicle 3 has a lower load-bearing capacity. And in order to meet the load-bearing capacity requirements for transporting the immersed tube segment 1, it is necessary to nearly fully spread the SPMT vehicle 3 under the bottom plate 13 of the immersed tube segment 1, such as Figure 2 As shown, the SPMT car 3 is hydraulically controlled, and during transportation, the single-axle support force is substantially the same, that is, the support force of each train of SPMT cars 3 is substantially the same, which makes it impossible to meet the above-mentioned support force control requirements, and easily causes the immersed tube segment 1 to crack.

[0068] In order to transport the immersed tube segment 1 by the SPMT vehicle 3, the height difference between the dock 6 and the deck surface of the semi-submersible barge 5 and the floating state of the semi-submersible barge 5 during the barge loading process are reduced. At the same time, the overall support force of the SPMT vehicle 3 is sufficient to reduce the cracking of the immersed tube segment 1. Figure 1-Figure 17 As shown, a floating barge construction method for a submerged tube segment 1 SPMT vehicle 3 is provided, comprising the following steps:

[0069] S1: After the reinforced concrete immersed tube segment 1 is prefabricated, the SPMT vehicle 3 is laid under the immersed tube segment 1, so that the SPMT vehicles 3 are arranged in a longitudinal row and symmetrically in the transverse direction of the immersed tube segment 1; then, a distribution beam 31 is arranged on the top movable part of the SPMT vehicle 3, so that the distribution beam 31 is distributed at intervals along the longitudinal direction of the immersed tube segment 1, and the distribution beam 31 is arranged transversely along the immersed tube segment 1; and then a first cushion block 32 is arranged on the distribution beam 31, so that the distribution beam 31 is provided with corresponding first cushion blocks 32 under the middle wall 12 and the side wall 11 of the immersed tube segment 1; wherein, the overall bearing capacity of the SPMT vehicle 3 is greater than or equal to the overall load of the immersed tube segment 1, the distribution beam 31 and the first cushion block 32;

[0070] like Figure 7 As shown, a distribution beam 31 is arranged on the SPMT vehicle 3, and the distribution beam 31 is evenly arranged along the longitudinal direction of the immersed tube segment 1. Sleeper support pads are arranged on the distribution beam 31 as first pads 32, and the first pads 32 are respectively arranged at the positions of the middle wall 12 and the side wall 11 of the immersed tube segment 1.

[0071] Technical points: The supporting force of the SPMT vehicle 3 is distributed to the first cushion block 32 through the distribution beam 31. In order to ensure that the supporting force of the first cushion block 32 is basically equal, the distribution beam 31 is specially designed.

[0072] The function of the distribution beam 31 is to distribute the support force of the SPMT vehicle 3 to the sleeper support pad.

[0073] In order to ensure that the immersed tube segment 1 does not crack, the sleeper support pads should be kept at the same horizontal plane as much as possible, that is, the support force and reaction force of the sleeper support pads should be equal. The distribution beam 31 will deform under the load of the SPMT vehicle 3, causing differences in the support force of the sleeper support pads, affecting the stress state of the immersed tube segment 1, so the distribution beam 31 needs to be designed.

[0074] Design goal: To control the sleeper support blocks to be basically on the same horizontal plane and the support reaction force to be uniform.

[0075] Design method: Through finite element numerical calculation, the appropriate structural dimensions and arrangement spacing of the distribution beam 31 are optimized to ensure that during the transportation of the SPMT vehicle 3, the sleeper support pads are basically on the same horizontal plane and the support reaction force tends to be uniform.

[0076] Optionally, before step S1, the following steps are further included to design the cross-sectional shape, structural dimensions and the number of distribution beams 31 to be evenly arranged along the immersed tube segment 1:

[0077] 1) Preliminarily plan the cross-sectional shape and structural dimensions of the distribution beams, and preliminarily determine the number of distribution beams to be evenly arranged along the longitudinal direction of the immersed tube segment;

[0078] 2) Use the mechanical model to calculate the deformation and force of the distribution beam;

[0079] 3) When the force on the distribution beam meets the preset stress requirements, and the difference in the deformation displacement of the distribution beam at the four first pads above the distribution beam is within 2 mm, the first design of the distribution beam is completed; when the force on the distribution beam does not meet the preset stress requirements, or the difference in the deformation displacement of the distribution beam at the four first pads above the distribution beam is greater than 2 mm, the cross-sectional shape and structural dimensions of the distribution beam are adjusted, or the number of distribution beams is evenly arranged along the longitudinal direction of the immersed tube segment, and then the mechanical model is used to calculate the deformation and force of the distribution beam, and step 3) is repeated until the first design of the distribution beam is completed;

[0080] 4) Based on the distribution beam designed for the first time, a finite element model of the SPMT vehicle transporting the immersed tube segment through the distribution beam and the first pad is established. The finite element model is used to analyze whether the stress of the immersed tube segment meets the crack control requirements. If the stress of the immersed tube segment meets the crack control requirements, the distribution beam design is completed; if the stress of the immersed tube segment does not meet the crack control requirements, the cross-sectional shape and structural dimensions of the distribution beam are adjusted, or the number of distribution beams uniformly arranged along the longitudinal direction of the immersed tube segment is repeated, and steps 2) to 4) are repeated until the stress of the immersed tube segment meets the crack control requirements and the distribution beam design is completed.

[0081] Further explanation: the design method of the distribution beam is: the weight of the immersed tube section is G, n distribution beams are laid out, arranged at equal intervals, and m SPMT train sets are laid out. Fig.18 The mechanical model in the paper is used to design the distribution beam.

[0082] Fig.18 Medium, F 1 is the supporting force of the first pad, and the forces of the four first pads are equal, F 1 =G / (4×n).

[0083] Fig.18 Medium, F 2 is the support force of the SPMT car, and the support forces of all SPMT cars are equal, F 2 =G / (m×n).

[0084] Specific design method:

[0085] 1. Commonly used I-beams, H-beams, etc. can be selected as distribution beams, and n distribution beams are initially laid out.

[0086] 2. Use the mechanical model to calculate the deformation and stress of the distribution beam.

[0087] 3. When the force on the distribution beam meets the allowable stress requirements of the specification, and the deformation displacement of the distribution beam at the four supporting pads is basically equal (the difference is controlled within 2mm as much as possible), the first design of the distribution beam is completed.

[0088] 4. When the force or deformation displacement of the distribution beam does not meet the above requirements, reselect or adjust the number of distribution beams, and calculate according to the mechanical model until the force or deformation displacement of the distribution beam meets the requirements to complete the first design of the distribution beam.

[0089] 5. Based on the first designed distribution beam, establish the finite element model of the SPMT vehicle transporting the immersed tube segment, and analyze whether the stress of the immersed tube segment meets the crack control requirements. If so, complete the distribution beam design. If not, reselect or adjust the number of distribution beams, and recalculate until the stress of the immersed tube segment meets the crack control requirements, and complete the distribution beam design.

[0090] The above distribution beam design method utilizes mechanical model calculation, has a simple calculation method, and uses finite element calculation as a verification method to ensure that the distribution beam design can meet the requirements of not cracking the immersed tube segment during transportation by the SPMT vehicle.

[0091] The distribution beam 31 will be deformed under the load of the SPMT vehicle 3, which will cause differences in the supporting force of the first cushion block 32 and affect the stress state of the immersed tube segment 1. The distribution beam 31 is specially designed to determine the cross-sectional shape, structural dimensions and uniform arrangement number of the distribution beam 31 along the longitudinal direction of the immersed tube segment 1 to ensure that the supporting force of the first cushion block 32 is basically equal, thereby reducing the influence of the deformation of the distribution beam 31 under the load of the SPMT vehicle 3 on the stress state of the immersed tube segment 1, making the stress of the immersed tube segment 1 more uniform and reducing the possibility of cracking of the immersed tube segment 1.

[0092] like Figure 8-Figure 11 As shown, through finite element calculation, the distribution beam 31 uses a double-jointed 1000×300×19 / 36 I-beam. At this time, the bottom plate 13 of the immersed tube segment 1 is basically in a horizontal state. Due to the deformation of the distribution beam 31, the elevation at the side wall 11 is 1mm lower than the elevation at the middle wall 12. Due to the effect of the deadweight, the elevation at the center of the roadway bottom plate 13 is 2mm lower. The supporting force of the first pad 32 tends to be uniform. The supporting force of the first pad 32 at the middle wall 12 is relatively large, which is 1890kN. The supporting force of the first pad 32 at the side wall 11 is relatively small, which is 1780kN. However, the difference in the supporting force between the two is small, and the force tends to be uniform, which meets the requirements of force control of the immersed tube segment 1.

[0093] In addition, before step S1, the layout position of the SPMT vehicle 3 needs to be determined. The SPMT vehicles 3 need to be arranged in a row in the longitudinal direction of the immersed tube segment 1 and connected to form a whole in the longitudinal direction; in the transverse direction of the immersed tube segment 1, the row formed by the SPMT vehicles 3 needs to be symmetrical in the transverse direction, which can ensure the balanced support of the SPMT vehicles 3 for the immersed tube segment 1.

[0094] Furthermore, it is also necessary to consider the impact of the process of prefabricating the immersed tube segment 1 and lowering the immersed tube segment 1 in the semi-submersible barge 5 on the transportation of the SPMT vehicle 3.

[0095] Optionally, before step S1, the steps of obtaining the laying position of the SPMT vehicle 3 below the immersed tube segment 1 are as follows:

[0096] Determine the preset position range of the onboard support 4 on the semi-submersible barge 5 for supporting the immersed tube segment 1 and the fixed pier 21 when the immersed tube segment 1 is prefabricated, and exclude the lateral position of the immersed tube segment 1 when the SPMT vehicle 3 transports the immersed tube segment 1 according to the preset position range of the onboard support 4 and the fixed pier 21; then determine the number of required SPMT vehicles 3 according to the weight of the immersed tube segment 1; and then obtain all layout position points of the required SPMT vehicles 3 corresponding to the immersed tube segment 1 according to the number of required SPMT vehicles 3 and excluding the lateral position of the SPMT vehicle 3 when transporting the immersed tube segment 1.

[0097] The lateral position of the SPMT vehicle 3 at the prestressed immersed tube segment 1 is staggered with the lateral position of the prestressed immersed tube segment 1 corresponding to the fixed pier 21, so that after the prestressed immersed tube segment 1 is prefabricated, the SPMT vehicle 3 can be arranged below the prefabricated prestressed immersed tube segment 1 to achieve force conversion between the fixed pier 21 and the SPMT vehicle 3; and the lateral position of the SPMT vehicle 3 at the prestressed immersed tube segment 1 is staggered with the lateral position of the prestressed immersed tube segment 1 corresponding to the support 4 on the ship, so that the SPMT vehicle 3 can transport the prestressed immersed tube segment 1 from the dock 6 to the semi-submersible barge 5 without being disturbed by the support 4 on the ship, and then the prestressed immersed tube segment 1 can be converted from being supported by the SPMT vehicle 3 to being supported by the support 4 on the ship.

[0098] As mentioned above, before the immersed tube segment 1 is transported by the SPMT vehicle 3, the immersed tube segment 1 needs to be prefabricated. Before step S1, the following steps are also included for prefabricating the reinforced concrete immersed tube segment 1:

[0099] The fixed piers 21 are arranged in longitudinal rows and transverse rows in the prefabrication plant, and each row of the fixed piers 21 is arranged corresponding to the side wall 11 or the middle wall 12 of the immersed tube segment 1 to be prefabricated, and the reinforced concrete immersed tube segment 1 is prefabricated above the fixed piers 21.

[0100] The prefabrication of the immersed tube segment 1 can be completed, and conditions can be provided for the SPMT vehicle 3 to enter under the prefabricated immersed tube segment 1 .

[0101] Furthermore, when prefabricating the immersed tube segment 1, it is necessary to use a fixed pier 21 to support the bottom mold of the immersed tube segment 1 to be prefabricated. Optionally, a first template 213 is provided on the top of the fixed pier 21.

[0102] When the immersed tube segment 1 is prefabricated, an auxiliary pier 22 is also included. A second template 221 is provided on the top of the auxiliary pier 22. The second template 221 and the first template 213 can be spliced ​​into a bottom template of the immersed tube segment 1. The auxiliary pier 22 can adjust the height of the second template 221.

[0103] When prefabricating the immersed tube segment 1, the following steps are also included:

[0104] The auxiliary piers 22 are arranged in longitudinal rows and transverse rows in the prefabrication plant, such as Figure 4 As shown, the auxiliary pier 22 and the fixed pier 21 are staggered in the transverse direction, and the second template 221 and the first template 213 are spliced ​​to form the bottom template of the immersed tube segment 1, and then the steel cage is tied and concrete is poured on the bottom template to form the immersed tube segment 1;

[0105] After the prefabrication of the immersed tube segment 1 is completed, the connection of the second template 221 is released. Figure 5 As shown, the height of the second template 221 is lowered by the auxiliary pier 22, and the auxiliary pier 22 and the second template 221 are moved out.

[0106] The auxiliary pier 22 cannot be used as the main support area. The purpose of the auxiliary pier 22 is to ensure that the bottom plate 13 is horizontal. The support force should be relatively small, which is conducive to crack control during the prefabrication of the immersed tube segment 1. Figure 1 and Figure 3 shown.

[0107] Except that, after the prefabricated immersed tube segment 1, the auxiliary pier 22 can be moved away from the bottom of the immersed tube segment 1, but the fixed pier 21 will still serve as the support of the bottom of the prefabricated immersed tube segment 1. In order to ensure that the fixed pier 21 will not affect the SPMT vehicle 3 at the bottom of the immersed tube segment 1, before the prefabricated immersed tube segment 1, the layout position of the fixed pier 21 in the prefabrication plant is determined according to the layout position of the SPMT vehicle 3, so that the lateral position of the SPMT vehicle 3 at the prestressed immersed tube segment 1 is offset with the lateral position of the fixed pier 21 corresponding to the prestressed immersed tube segment 1, so that after the prestressed immersed tube segment 1 is prefabricated, the SPMT vehicle 3 can be arranged under the prefabricated prestressed immersed tube segment 1, so as to realize the force conversion between the fixed pier 21 and the SPMT vehicle 3.

[0108] The prefabrication of the pipe segment adopts the form of multiple piers support, and the template is placed on the multiple piers, on which the steel cage is tied and the concrete is poured. The piers are composed of fixed piers 21 and auxiliary piers 22. The fixed piers 21 should be arranged as far as possible under the middle wall 12 and the side wall 11 of the immersed tube segment 1. Considering the needs of the deployment and movement of the SPMT vehicle 3, the position can be appropriately adjusted after empirical calculation. For example, the SPMT vehicle 3 needs to be deployed between the two fixed piers 21 at the middle wall 12. The fixed pier 21 is not completely placed under the middle wall 12, but through finite element calculation and analysis, it meets the crack control requirements of the immersed tube segment 1.

[0109] In order to ensure that the SPMT vehicle 3 can smoothly travel to the bottom plate 13 of the prefabricated immersed tube segment 1 and place the distribution beam 31 and the first cushion block 32 thereon; to ensure that the second cushion block 212 above the steel pier can be smoothly removed after the SPMT vehicle 3 is lifted; to ensure that the SPMT vehicle 3 can smoothly travel during the transportation of the immersed tube segment 1 without being affected by the steel pier. The fixed pier 21 also needs to be designed:

[0110] Design principle of fixed pier 21: fixed pier 21 is composed of lower steel pier and upper sleeper pad as second pad 212, the height of steel pier is between the lowest height and driving height of SPMT vehicle 3 (for example: the lowest height of SPMT vehicle 3 is 1.2m, the driving height is 1.5m, the height of steel pier can be set to 1.35m), the total height of fixed pier 21 is greater than the lowest height of SPMT + the height of distribution beam 31 + the height of the first pad 32 on the distribution beam 31 during the transportation of sleeper pad, and the total height of fixed pier 21 is less than the driving height of SPMT + the height of distribution beam 31 + the height of the first pad 32 on the distribution beam 31 during the transportation of sleeper pad. So as to achieve the following design objectives:

[0111] ① Ensure that the SPMT vehicle 3 travels smoothly to the bottom of the immersed tube segment 13, and places a distribution beam 31 and a first cushion block 32 thereon. The first cushion block 32 may be a sleeper;

[0112] ② Ensure that after the SPMT vehicle 3 is lifted, the second pad 212 above the steel pier can be removed smoothly. The second pad 212 can also be a sleeper;

[0113] ③ Ensure that the SPMT vehicle 3 can move smoothly during the transportation of the immersed tube segment 1 without being affected by the steel piers.

[0114] In step S1, the SPMT vehicle 3 is driven to the bottom of the immersed tube segment 1. Figure 6 As shown, the SPMT car 3 is arranged longitudinally, as shown in FIG. Figure 7 As shown, the vehicle groups are arranged symmetrically in the transverse direction, and the SPMT vehicle group 3 must meet the load-bearing requirements of the immersed tube segment 1. And the layout of the SPMT vehicle 3 needs to avoid the fixed piers 21 and the ship support 4 to ensure the smooth walking track of the SPMT vehicle 3. For example, the immersed tube segment 1 weighs 34,000 tons, is 80m long, 42.8m wide, and the distribution beam 31 is about 1,000 tons. The SPMT vehicle 3 requires 1020 axles, 15 rows, 60 axles per row, and a load capacity of about 40,000 tons, which is greater than the total weight of the immersed tube segment 1 and the distribution beam 31, meeting the load requirement. After the SPMT vehicle 3 is laid out, and the specially designed distribution beam 31 and the first pad 32 above the distribution beam 31 are laid out, enter step S2;

[0115] S2: The SPMT vehicle 3 is supported by the hydraulic cylinder to rise, so that the first cushion block 32 is supported on the bottom of the immersed tube segment 1, and the immersed tube segment 1 is separated from the fixed pier 21; the movable part on the top of the SPMT vehicle 3 can be adaptively raised and lowered, and the adaptive formation is large. The SPMT vehicle 3 is supported by the hydraulic cylinder to rise, and the immersed tube segment 1 can be transformed from the fixed pier 21 to the SPMT vehicle 3, and under the action of the distribution beam 31 and the first cushion block 32, the SPMT vehicle 3 is prevented from directly supporting the immersed tube segment 1 and causing cracks;

[0116] S3: The immersed tube segment 1 is transferred from the dock 6 to the semi-submersible barge 5 by the SPMT vehicle 3. The SPMT vehicle 3 moves to transfer the immersed tube segment 1. Figure 12-Figure 15 ; Because of the large stroke adaptive adjustment capability and walking flexibility of the SPMT vehicle 3, the difficulty of controlling the cracking of the submerged tube segment 1 during the floating barge in step S3 is reduced;

[0117] Before step S3, the method further includes the following steps: stern-to-side the semi-submersible barge 5 and moor it to the side of the wharf 6 by means of cables; then a 40mm-50mm thick steel plate is laid at the joint between the wharf 6 and the semi-submersible barge 5 to meet the requirements of the SPMT vehicle 3 for barge-on; and then a shipboard support 4 is arranged on the deck of the semi-submersible barge 5; wherein the lateral arrangement position of the shipboard support 4 on the semi-submersible barge 5 is determined according to the arrangement position of the SPMT vehicle 3, and the shipboard support 4 is a continuous structure in the longitudinal direction of the semi-submersible barge 5. After the semi-submersible barge 5 is moored, the shipboard support 4 is arranged on the deck of the semi-submersible barge 5. When there is an error in the mooring of the semi-submersible barge 5, the shipboard support 4 is arranged later to ensure that the shipboard support 4 will not interfere with the barge-on movement of the SPMT vehicle 3, thereby overcoming the interference caused by the mooring error of the semi-submersible barge 5. Moreover, the onboard support 4 is a continuous structure in the longitudinal direction of the semi-submersible barge 5. For example, an I-beam structure is arranged longitudinally along the semi-submersible barge 5. This can ensure that after the SPMT vehicle 3 transports the immersed tube segment 1 into the semi-submersible barge 5, even if there is a longitudinal error, the distribution beam 31 can still be placed on the onboard support 4, thereby reducing the difficulty of pier alignment.

[0118] Before arranging the shipboard support 4 on the deck of the semi-submersible barge 5, the step is also included: determining the arrangement position of the shipboard support 4 on the deck of the semi-submersible barge 5, because the approximate range of the arrangement position of the shipboard support 4 has been determined before, and the arrangement position point of the SPMT vehicle 3 has been obtained, and then the arrangement position of the shipboard support 4 on the deck of the semi-submersible barge 5 is determined according to the arrangement position point of the SPMT vehicle 3, which can avoid the SPMT vehicle 3 being affected by the shipboard support 4 during the process of transporting the immersed tube segment 1, and then after the immersed tube segment 1 is transported to the semi-submersible barge 5 by the SPMT vehicle 3, it can reach the designated position where the shipboard support 4 is provided, and then the immersed tube segment 1 can be converted by the SPMT vehicle 3 to the shipboard support 4 to bear the force.

[0119] Preferably, Fig.17As shown, 8 rows of ship supports 4 are arranged at intervals on the semi-submersible barge 5, and are arranged symmetrically in the transverse direction, of which 4 rows of ship supports 4 correspond to the two side walls 11 and the two middle walls 12 of the immersed tube segment 1, and the other 4 rows of ship supports 4 are located between two adjacent rows of SPMT vehicles 3, and the ship supports 4 distributed transversely along the semi-submersible barge 5 are symmetrically arranged about the longitudinal center axis of the immersed tube segment 1. Among them, there are 4 rows of fixed piers 21, which are respectively arranged under the two side walls 11 and the two middle walls 12, and correspondingly, 8 rows of ship supports 4 are provided, of which 4 rows of ship supports 4 correspond to the two side walls 11 and the two middle walls 12 of the immersed tube segment 1, and are arranged corresponding to the fixed piers 21, which can ensure the smoothness of the SPMT vehicle 3 in transporting the immersed tube segment 1. And the other 4 rows are equivalent to newly added ones, and they also need to be staggered with the SPMT vehicle 3 in the lateral position of the immersed tube segment 1. This arrangement can increase the supporting capacity of the onboard support 4 on the semi-submersible barge 5 for the immersed tube segment 1 while ensuring the overall bearing capacity of the SPMT vehicle 3, that is, the number of SPMT vehicles 3 can meet the upper load. Furthermore, when the immersed tube segment 1 is transferred from the force of the SPMT vehicle 3 to the force of the onboard support 4, the deformation influence on the semi-submersible barge 5 can be reduced, and the requirements for the deck surface of the semi-submersible barge 5 can be smaller, and the control is easier.

[0120] In step S3, the influence of the operation window and the moving speed of the SPMT vehicle 3 on the crack control of the immersed tube segment 1 also needs to be considered, and during the barge loading process, the floating state of the semi-submersible barge 5 needs to be controlled to control the cracking of the immersed tube segment 1.

[0121] Optionally, before the submerged tube segment 1 is put on the barge, a suitable operation window (no strong wind and waves, and appropriate tidal changes) is selected through theoretical analysis. In the pre-selected operation window, the submerged tube segment 1 is driven by the SPMT vehicle 3 to be put on the barge from the dock 6 to the semi-submerged barge 5;

[0122] During the process of loading, the loading speed is controlled within 0.5m / min to 1m / min, and the semi-submersible barge 5 ballast tank is used to adjust the load, and the height difference between the dock 6 and the stern deck surface and the floating state of the semi-submersible barge 5 are controlled to meet the control requirements of the SPMT vehicle 3 walking and the stability and safety of the semi-submersible barge 5. The floating state of the semi-submersible barge 5 includes heel and pitch. For example: Optionally, the height difference between the dock 6 and the stern deck surface is controlled within ±5cm, and the heel and pitch of the semi-submersible barge 5 are controlled within 1°.

[0123] When the immersed tube segment 1 is transported to a designated position in the semi-submersible barge 5 where the onboard support 4 is provided by the SPMT vehicle 3, step S4 is entered.

[0124] S4: The SPMT vehicle 3 supports the hydraulic cylinder to descend, so that the distribution beam 31 falls onto the ship support 4 in the semi-submersible barge 5;

[0125] S5: The SPMT vehicle 3 is supported by the hydraulic cylinder to continue to descend, so that the SPMT vehicle 3 is not in contact with the bottom surface of the distribution beam 31;

[0126] S6: The SPMT vehicle 3 reverses from the semi-submersible barge 5 to the dock 6, and the barge construction is completed. In steps S4-S5, after the immersed tube segment 1 is transported to the predetermined position in the semi-submersible barge 5, the SPMT vehicle 3 descends and places the distribution beam 31 on the ship support 4. After the landing is completed, the SPMT vehicle 3 withdraws and retreats to shore.

[0127] In the floating barge construction method of the SPMT vehicle 3 of the immersed tube segment 1 of the present embodiment, after the reinforced concrete immersed tube segment 1 is prefabricated, the SPMT vehicle 3 is arranged below the immersed tube segment 1, and a distribution beam 31 is arranged on the SPMT vehicle 3, so that the distribution beam 31 is distributed along the longitudinal interval of the immersed tube segment 1, and the distribution beam 31 is arranged transversely along the immersed tube segment 1, and then a first cushion block 32 is arranged on the distribution beam 31, so that the distribution beam 31 is provided with corresponding first cushion blocks 32 below the middle wall 12 and the side wall 11 of the immersed tube segment 1, and the supporting force of the SPMT vehicle 3 is distributed to the first cushion block 32 through the distribution beam 31, and is transmitted to the immersed tube segment 1 by the first cushion block 32. At the side wall 11 and the middle wall 12, more SPMT vehicles 3 can be arranged under the immersed tube segment 1, so that the overall bearing capacity of the SPMT vehicle 3 is greater than or equal to the overall load of the immersed tube segment 1, the distribution beam 31 and the first cushion block 32, meeting the transportation requirements, and the immersed tube segment 1 will not be cracked during transportation because the SPMT vehicle 3 is not under the side wall 11 and the middle wall 12 of the immersed tube segment 1. This method enables the use of the SPMT vehicle 3 to meet the bearing conditions, so that the SPMT vehicle 3 can be used to transport the immersed tube segment 1 by barge. Compared with the prior art using a transport trolley, the difficulty of controlling the cracking of the immersed tube segment 1 during the floating barge process can be reduced.

[0128] After the pipe sections are put on the barge, the semi-submersible barge 5 sinking pipes are sealed and reinforced. Fig.16 As shown, the sealing and reinforcement uses the bottom steel bracket 51 as the main limiting device, supplemented by steel wire ropes. After the immersed tube segment 1 is in place, the forklift places the steel bracket at the designated position, welds and reinforces it, and the steel wire rope uses a basket screw to further tighten the immersed tube segment 1 to ensure the stability of the immersed tube segment 1 when transported by the semi-submersible barge 5.

[0129] In view of the difficulty in controlling cracking during floating transfer of the immersed tube segment 1, the present invention proposes a floating transfer process of the SPMT vehicle 3. The supporting force of the SPMT vehicle 3 is evenly distributed to the first cushion block 32 through the design of the distribution beam 31, ensuring that the immersed tube segment 1 does not crack during the transfer process.

[0130] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction method for floating up a submerged tube segment SPMT vehicle, characterized in that: The following steps are involved: S1: After the reinforced concrete immersed tube segment is prefabricated, the SPMT vehicle is laid under the immersed tube segment, so that the SPMT vehicles are arranged in a row in the longitudinal direction of the immersed tube segment and are arranged symmetrically in the transverse direction; then a distribution beam is arranged on the movable part on the top of the SPMT vehicle, so that the distribution beams are distributed at intervals in the longitudinal direction of the immersed tube segment, and the distribution beams are arranged in the transverse direction of the immersed tube segment; then a first pad is arranged on the distribution beam, so that the distribution beam is provided with corresponding first pads under the middle wall and side wall of the immersed tube segment; wherein the overall bearing capacity of the SPMT vehicle is greater than or equal to the overall load of the immersed tube segment, the distribution beam and the first pad; S2: The SPMT vehicle supports the hydraulic cylinder to rise, so that the first cushion block is supported on the bottom of the immersed tube segment, and the immersed tube segment is separated from the fixed pier; S3: Use the SPMT vehicle to transfer the immersed tube segment from the dock surface to the semi-submersible barge; S4: The SPMT vehicle supports the hydraulic cylinder to descend, so that the distribution beam falls to the support on the ship in the semi-submersible barge; S5: The SPMT car supports the hydraulic cylinder to continue to descend, so that the SPMT car does not contact the bottom surface of the distribution beam; S6: The SPMT vehicle reverses from the semi-submersible barge back to the dock surface, and the barge loading construction is completed.

2. The method for floating up a submerged tube segment SPMT vehicle according to claim 1 is characterized in that: Before step S1, the design steps of distributing the cross-sectional shape, structural dimensions and the number of beams uniformly arranged along the longitudinal direction of the immersed tube segment are also included: 1) Preliminarily plan the cross-sectional shape and structural dimensions of the distribution beams, and preliminarily determine the number of distribution beams to be evenly arranged along the longitudinal direction of the immersed tube segment; 2) Use the mechanical model to calculate the deformation and force of the distribution beam; 3) When the force on the distribution beam meets the preset stress requirements, and the difference in the deformation displacement of the distribution beam at the four first pads above the distribution beam is within 2 mm, the first design of the distribution beam is completed; when the force on the distribution beam does not meet the preset stress requirements, or the difference in the deformation displacement of the distribution beam at the four first pads above the distribution beam is greater than 2 mm, the cross-sectional shape and structural dimensions of the distribution beam are adjusted, or the number of distribution beams is evenly arranged along the longitudinal direction of the immersed tube segment, and then the mechanical model is used to calculate the deformation and force of the distribution beam, and step 3) is repeated until the first design of the distribution beam is completed; 4) Based on the distribution beam designed for the first time, a finite element model of the SPMT vehicle transporting the immersed tube segment through the distribution beam and the first pad is established. The finite element model is used to analyze whether the stress of the immersed tube segment meets the crack control requirements. If the stress of the immersed tube segment meets the crack control requirements, the distribution beam design is completed; if the stress of the immersed tube segment does not meet the crack control requirements, the cross-sectional shape and structural dimensions of the distribution beam are adjusted, or the number of distribution beams uniformly arranged along the longitudinal direction of the immersed tube segment is repeated, and steps 2) to 4) are repeated until the stress of the immersed tube segment meets the crack control requirements and the distribution beam design is completed.

3. The method for floating up a submerged tube segment SPMT vehicle according to claim 1 is characterized in that: Before step S1, the steps for obtaining the laying position of the SPMT vehicle below the immersed tube segment are as follows: Determine the preset position range of the onboard supports on the semi-submersible barge used to support the immersed tube segments and the fixed piers during prefabrication of the immersed tube segments, and exclude the lateral position of the immersed tube segments when the SPMT vehicles are used to transport the immersed tube segments based on the preset position range of the onboard supports and the fixed piers; then determine the number of required SPMT vehicles based on the weight of the immersed tube segments; and then obtain all layout position points of the required SPMT vehicles corresponding to the immersed tube segments based on the number of required SPMT vehicles and excluding the lateral position of the SPMT vehicles when transporting the immersed tube segments.

4. The method for floating up a submerged tube segment SPMT vehicle according to claim 3 is characterized in that: Before step S1, the following steps are also included: Fixed piers are arranged in longitudinal rows and transverse rows in the prefabrication plant, and each row of fixed piers corresponds to the side wall or middle wall of the immersed tube segment to be prefabricated, and reinforced concrete immersed tube segments are prefabricated above the fixed piers.

5. The method for floating up a submerged tube segment SPMT vehicle according to claim 4 is characterized in that: The layout position of the fixed pier in the prefabrication plant is determined according to the layout position of the SPMT vehicle.

6. A construction method for floating up a submerged tube segment SPMT vehicle according to claim 4, characterized in that: The fixed pier includes a lower steel pier and an upper second pad. The height of the steel pier is between the minimum height and the driving height of the SPMT vehicle. The total height of the fixed pier is greater than the sum of the minimum height of the SPMT, the height of the distribution beam, and the height of the first pad. The total height of the fixed pier is less than the sum of the driving height of the SPMT, the height of the distribution beam, and the first pad.

7. The method for floating up a submerged tube segment SPMT vehicle according to claim 4 is characterized in that: A first template is provided on the top of the fixed pier; It also includes an auxiliary buttress, a second template is provided on the top of the auxiliary buttress, the second template and the first template can be spliced ​​into a bottom template of the immersed tube section, and the auxiliary buttress can adjust the height of the second template; The following steps are also included: The auxiliary piers are arranged in longitudinal rows and transverse rows in the prefabrication plant, so that the auxiliary piers and the fixed piers are staggered in the transverse direction, and the second formwork and the first formwork are spliced ​​to form the bottom formwork of the immersed tube segment, and then the steel cage is tied and concrete is poured above the bottom formwork to form the immersed tube segment; After the prefabrication of the immersed tube segment is completed, the connection of the second formwork is released, and then the height of the second formwork is lowered by the auxiliary piers, and the auxiliary piers and the second formwork are removed.

8. The method for floating up a submerged tube segment SPMT vehicle according to claim 3 is characterized in that: Before step S3, the semi-submersible barge is stern-to-side and moored to the dock by cables; then a 40mm-50mm thick steel plate is laid at the joint between the dock and the semi-submersible barge; and the onboard support is arranged on the deck of the semi-submersible barge; wherein the lateral arrangement position of the onboard support on the semi-submersible barge is determined according to the arrangement position of the SPMT vehicle, and the onboard support is a continuous structure in the longitudinal direction of the semi-submersible barge.

9. A construction method for floating up a submerged tube segment SPMT vehicle according to claim 8, characterized in that: Eight rows of shipboard supports are arranged at intervals laterally on the semi-submersible barge, of which four rows of shipboard supports correspond to the two side walls and two middle walls of the immersed tube segment, and the other four rows of shipboard supports are located between two adjacent rows of SPMT vehicles. The shipboard supports distributed laterally along the semi-submersible barge are symmetrically arranged about the longitudinal center axis of the immersed tube segment.

10. A construction method for floating up a submerged tube segment SPMT vehicle according to any one of claims 1 to 9, characterized in that: In step S3, in the pre-selected operation window, the submerged tube segment is moved from the dock to the semi-submersible barge by the SPMT vehicle; During the barge loading process, the barge loading speed is controlled within 0.5m / min to 1m / min, and the load is adjusted through the semi-submersible barge ballast tank to control the height difference between the dock surface and the stern deck surface and the buoyancy of the semi-submersible barge to meet the control requirements of the SPMT vehicle movement and the stability and safety of the semi-submersible barge.

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