A shield immersed tube combined construction method for submarine tunnel docking

Abstract

The present invention discloses a shield tunneling combined construction method for submarine tunnel docking, including obtaining the longest theoretical maintenance distance of a single excavation of a shield machine and the docking position of a prefabricated pipe section according to the construction environment and the length of the tunnel to be built; setting a docking pipe section at the docking position by using the immersed pipe method; judging whether it is necessary to set the maintenance position of the prefabricated pipe section, if yes, setting the maintenance pipe section at the maintenance position between the starting position at both ends of the tunnel to be built and the docking pipe section by using the immersed pipe method; at least two shield machines respectively excavate the prefabricated pipe section along a preset path from the starting position at both ends of the tunnel to be built, until the shield machine excavates into the docking pipe section. The method can realize tunnel construction at locations with complex geological conditions, long distances and large cross-sections, and in the process of building a tunnel with a long distance, the shield machine can be overhauled at the set maintenance position to ensure the safety of the shield machine.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and more specifically to a shield immersed tube combined construction method for submarine tunnel docking. Background Art

[0002] With the continuous progress of urbanization and the increasing efforts in underground space development, the planning and construction of ultra-long distance and ultra-large cross-section underwater tunnels are constantly emerging.

[0003] At present, underwater tunnels are mainly constructed by shield method, mining method and immersed tube method. The above methods have different technical advantages and different restrictive factors, and are suitable for different construction conditions. When the construction conditions of underwater tunnels are complex and the geological conditions of the tunnel site vary greatly, the use of a single method has no technical advantages in terms of project investment, construction period and engineering risks. Especially in the construction of ultra-long distance and ultra-large cross-section submarine tunnels, the construction disadvantages of a single method are more obvious. Therefore, for long-distance and large-section submarine tunnel projects under complex conditions, it is necessary to select a combination of multiple methods for construction, give full play to the technical advantages of each method, make the best use of its strengths and avoid its weaknesses, and ensure the safe, efficient and green completion of the project construction.

[0004] In the prior art, shield mining combined construction methods are usually used to build long-distance and large-section submarine tunnels, but this method is only suitable for the construction of hard rock submarine tunnels with good geological conditions. In addition, there are two types of shield machines, receiving shields and penetration shields, which are used to excavate towards each other and dock. However, the shield equipment is complex in design, long-distance excavation and maintenance are difficult, and there are certain risks in submarine docking.

[0005] In summary, how to solve the problem of the difficulty in constructing long-distance and large-section submarine tunnels with complex geological conditions is an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0006] In view of this, the purpose of the present invention is to provide a shield immersed tube combined construction method for submarine tunnel docking, which can realize submarine tunnel construction in locations with complex geological conditions, long distances and large end faces.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A shield immersed tube combined construction method for submarine tunnel docking, comprising:

[0009] According to the construction environment and the length of the proposed tunnel, the longest theoretical maintenance distance of the shield machine for a single excavation and the docking position of the prefabricated pipe segment are obtained; and the butt joint pipe segment is set at the butt joint position by using the immersed pipe method;

[0010] Determine whether it is necessary to set up a maintenance position for the prefabricated pipe segment, and if so, use the immersed tube method to set up maintenance pipe segments at the maintenance positions between the starting positions at both ends of the proposed tunnel and the butted pipe segments;

[0011] At least two of the shield machines respectively excavate toward the prefabricated pipe section from the starting positions at both ends of the proposed tunnel along a preset path until the shield machines excavate into the butted pipe sections.

[0012] Preferably, it also includes:

[0013] When excavating toward the prefabricated pipe section along the preset path from the starting positions at both ends, segment lining is performed;

[0014] When the shield machine excavates to the port seal of the prefabricated pipe segment, a breaking operation is performed, and after the shield machine excavates into the prefabricated pipe segment, the cutter is stopped to complete the segment lining at the port seal;

[0015] If the maintenance pipe section is provided, when the shield machine is located in the maintenance pipe section, the shield machine receives a signal that the maintenance is completed and then starts to build a chamber again until the shield machine excavates into the docking pipe section.

[0016] Preferably, the method of obtaining the longest theoretical inspection distance of a single tunneling of the shield machine and the docking position of the prefabricated pipe segment according to the construction environment and the length of the proposed tunnel; and arranging the docking pipe segment at the docking position by using the immersed pipe method includes:

[0017] If S is less than or equal to 2L, where S is the length of the planned tunnel and L is the longest theoretical maintenance distance of a single excavation of the shield machine, then one docking position is set on the planned path; if S is greater than 2L, then one docking position and several maintenance positions are set on the planned path.

[0018] Preferably, a first butt joint is arranged at the butt joint position by using a pipe sinking method, and a port seal having an axial length greater than the main machine length of the shield machine is installed at the end of the first butt joint, and a margin value is left at the end of the port seal;

[0019] A first maintenance pipe section is set at the maintenance position by using the immersed tube method, and a port seal with an axial length greater than the length of the shield machine main machine is installed at the end of the first maintenance pipe section, and a margin value is left at the end of the port seal.

[0020] Preferably, the margin value is greater than or equal to the width of the two rings of the pipe segments.

[0021] Preferably, the axial length of the maintenance chamber of the maintenance pipe segment is greater than or equal to 1.5 times the main machine length of the shield machine, and the height of the maintenance chamber is greater than or equal to the sum of the maximum excavation diameter of the shield machine and the maintenance margin.

[0022] Preferably, the axial length of the docking chamber of the docking tube joint is greater than or equal to 4.5 times the main machine length of the shield machine, and the height of the docking chamber is greater than or equal to the sum of the maximum excavation diameter of the shield machine and the top disassembly margin.

[0023] Preferably, when the shield machine excavates to the port seal of the prefabricated pipe segment, a breaking operation is performed, and after the shield machine excavates into the prefabricated pipe segment, the cutter is stopped to complete the segment lining at the port seal, including:

[0024] After the shield machine excavates to a first preset position outside the prefabricated pipe segment, multiple docking measurements are performed to calibrate the relative position of the shield machine and the adjacent prefabricated pipe segment;

[0025] After the shield machine continues to excavate to the second preset position according to the designed route, when the shield machine continues to excavate, each time a ring of the segments is assembled, the segments are rigidly connected to the segments of the previous ring;

[0026] When the shield machine continues to advance to the third preset position, the relative position between the shield machine and the prefabricated pipe segment is remeasured, and the posture of the shield machine is adjusted in real time again according to the remeasurement result, and the shield machine continues to advance until it is precisely aligned with the port seal of the prefabricated pipe segment;

[0027] The tunneling parameters are adjusted, and the shield machine continues to tunnel until the seal on the port is completely broken.

[0028] Preferably, the position building process includes:

[0029] A reaction frame and a secondary starting platform are arranged in the maintenance pipe section, and the shield machine is started and excavated forward;

[0030] Lining the pipe segment in the maintenance pipe segment, adjusting the posture of the shield machine and aligning the port seal on the outlet side of the maintenance pipe segment;

[0031] The circulation system is started, the shield machine breaks the port seal on the outlet side of the maintenance pipe segment, adjusts the excavation parameters and monitors the grouting behind the wall, and performs synchronous grouting using water-stopping materials;

[0032] After the shield machine continues to advance forward and completely passes through the maintenance pipe segment, the segments and reaction frames lining the maintenance pipe segment are removed, and the grouting density of the first ring of the segment wall on the outlet side of the maintenance pipe segment is remeasured.

[0033] Preferably, the at least two shield machines respectively excavate toward the prefabricated pipe section from the starting positions at both ends of the proposed tunnel along a preset path until the shield machines excavate into the butted pipe section, and further include:

[0034] Sequentially disassemble and transport the rear supporting components and assembling machine of the shield machine, disassemble the cutter head of the shield machine and temporarily store it in the docking pipe joint, disassemble and remove the structure inside the shield machine and transport it out of the tunnel, disassemble the shield machine in blocks and transport it out, and finally transport the cutter head in blocks;

[0035] Processing of the dismantling site.

[0036] The shield-driven immersed tube combined construction method for submarine tunnel docking provided by the present invention determines whether it is necessary to set up a maintenance position according to the construction environment and the length of the proposed tunnel. If necessary, the docking pipe section and the maintenance pipe section are respectively fixed at the set docking position and the maintenance position by the immersed tube method, and then at least two shield machines are used to excavate towards the prefabricated pipe section from the starting positions at both ends of the proposed tunnel, until the entire tunnel is constructed by excavating into the docking pipe section.

[0037] Since maintenance pipe sections are set at the maintenance position through the immersed tube method, the shield machine can be maintained in the maintenance pipe sections during the construction of long-distance and large-section submarine tunnels, thereby realizing the maintenance of the shield machine during long-distance excavation and ensuring the safety of the shield machine during docking. The combination of the immersed tube method and the shield method is suitable for the construction of submarine tunnels with complex geological conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0039] Figure 1 A schematic diagram of a submarine tunnel provided by the present invention using a shield-driven immersed tube combined construction method for submarine tunnel docking;

[0040] Figure 2 A schematic diagram of the process flow of the shield immersed tube combined construction method for submarine tunnel docking provided by the present invention;

[0041] Figure 3 It is a structural schematic diagram of the maintenance pipe section of the shield immersed tube combined construction method for submarine tunnel docking provided by the present invention;

[0042] Figure 4This is a schematic structural diagram of a prefabricated pipe segment of a shield immersed tube combined construction method for submarine tunnel docking provided by the present invention;

[0043] Figure 5 A cross-sectional view of a maintenance pipe segment of a shield immersed tube combined construction method for submarine tunnel docking provided by the present invention;

[0044] Figure 6 It is a structural schematic diagram of a butt joint of a shield immersed tube combined construction method for butt jointing of submarine tunnels provided by the present invention;

[0045] Figure 7 A cross-sectional view of a butt joint pipe joint of a shield immersed tube assembly method for butt jointing a submarine tunnel provided by the present invention;

[0046] Figure 8 A schematic diagram of a shield machine located at a first preset position for a shield-driven immersed tube combined construction method for submarine tunnel docking provided by the present invention;

[0047] Fig. 9 A schematic diagram of a shield machine located at a third preset position for a shield-driven immersed tube combined construction method for submarine tunnel docking provided by the present invention;

[0048] Fig.10 A schematic diagram of a shield machine located at a fourth preset position for a shield-driven immersed tube combined construction method for submarine tunnel docking provided by the present invention;

[0049] Fig.11 A schematic diagram of a shield machine located at a pipe section for inspection in a shield-driven immersed tube combined construction method for submarine tunnel docking provided by the present invention;

[0050] Fig.12 A schematic diagram of breaking the port seal of a shield machine in a shield immersed tube combined construction method for submarine tunnel docking provided by the present invention;

[0051] Fig.13 A schematic diagram of a shield machine passing through a maintenance pipe segment in a shield-driven immersed tube combined construction method for submarine tunnel docking provided by the present invention;

[0052] Fig.14 It is a schematic diagram of the shield machine docking of the shield immersed tube combined construction method for submarine tunnel docking provided by the present invention.

[0053] Figure 1-14 middle:

[0054] 1 is the shield machine, 2 is the maintenance position, 3 is the docking position, 4 is the port seal, 5 is the main machine bracket, 6 is the sealing door, 7 is the auxiliary lifting point, 8 is the maintenance pipe joint, 9 is the storage area for the disassembled cutter head, 10 is the docking pipe joint, 11 is the assembly machine, 12 is the rear supporting parts, 13 is the cutter head, 14 is the thrust cylinder, 15 is the water-stopping material, 16 is the pipe segment, and 17 is the reaction frame. DETAILED DESCRIPTION

[0055] 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 of the present invention. 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 creative work are within the scope of protection of the present invention.

[0056] The core of the present invention is to provide a shield immersed tube combined construction method for submarine tunnel docking, which can realize submarine tunnel construction in locations with complex geological conditions, long distances and large end faces.

[0057] Please refer to Figure 1-Figure 14 , Figure 1 A schematic diagram of a submarine tunnel using a shield-driven immersed tube combined construction method for submarine tunnel docking; Figure 2 It is a flow chart; Figure 3 It is the structural diagram of the maintenance pipe section; Figure 4 It is a structural schematic diagram of a prefabricated pipe segment; Figure 5 It is a cross-sectional view of the pipe section for inspection; Figure 6 It is a structural schematic diagram of the butt joint; Figure 7 It is a cross-sectional view of a butt joint; Figure 8 is a schematic diagram of a shield machine located at a first preset position; Fig. 9 is a schematic diagram of the shield machine being located at the third preset position; Fig.10 is a schematic diagram of the shield machine being located at the fourth preset position; Fig.11 This is a schematic diagram of the shield machine located at the maintenance section; Fig.12 Schematic diagram of breaking the port seal for the shield machine; Fig.13 This is a schematic diagram of the shield machine passing through the maintenance pipe segment; Fig.14 Schematic diagram of shield machine docking.

[0058] The present application provides a shield immersed tube combined construction method for submarine tunnel docking, comprising:

[0059] Step S1, according to the construction environment and the length of the planned tunnel, the longest theoretical maintenance distance of the shield machine 1 for a single excavation and the docking position 3 of the prefabricated pipe segment are obtained; and the docking pipe segment 10 is arranged at the docking position 3 by using the immersed pipe method;

[0060] Step S2, determining whether it is necessary to set up a maintenance position 2 for the prefabricated pipe segment, and if so, setting up a maintenance pipe segment 8 at the maintenance position 2 between the starting position at both ends of the proposed tunnel and the butt joint pipe segment 10 by using the immersed tube method;

[0061] Step S3, at least two shield machines 1 respectively excavate the prefabricated pipe segment along a preset path from the starting positions at both ends of the proposed tunnel, until the shield machine 1 excavates into the butted pipe segment 10.

[0062] Specifically, the longest theoretical maintenance distance of a single excavation of the shield machine 1 is calculated mainly based on the formation conditions, tunnel excavation diameter, allowable wear of the cutterhead tool design, and theoretical tool change mileage. The prefabricated pipe segment docking position 3 and maintenance position 2 are set, preferably at locations suitable for immersed pipe construction such as stable geology, slow water flow, and relatively small soil cover. The prefabricated pipe segments include at least two types: maintenance pipe segments 8 and docking pipe segments 10.

[0063] At least two shield machines 1 start from the two ends of the tunnel respectively, and excavate in the direction of the prefabricated pipe segment along the preset path. The detection system carried on the shield machine 1 conducts advance detection of the stratum in real time, and adjusts the excavation posture of the shield machine 1 in real time to ensure that the shield machine 1 excavates according to the planned route.

[0064] The shield-driven immersed tube combined construction method for submarine tunnel docking provided by the present invention determines whether it is necessary to set up a maintenance position 2 according to the construction environment and the length of the proposed tunnel. If necessary, the docking pipe section 10 and the maintenance pipe section 8 are respectively fixed at the set docking position 3 and the maintenance position 2 by the immersed tube method, and then at least two shield machines 1 are used to excavate towards the prefabricated pipe sections from the starting positions at both ends of the proposed tunnel, until the excavation is carried out into the docking pipe section 10 to complete the construction of the entire tunnel.

[0065] Since the maintenance pipe segment 8 is set at the maintenance position 2 by the immersed tube method, the shield machine 1 can be maintained in the maintenance pipe segment 8 during the construction of a long-distance and large-section submarine tunnel, thereby realizing the maintenance of the shield machine 1 during long-distance excavation and ensuring the safety of the shield machine 1 during docking. The combination of the immersed tube method and the shield method is suitable for the construction of submarine tunnels with complex geological conditions.

[0066] In addition, at least one side of the outer periphery of the prefabricated pipe segment is a flat side surface to ensure that the prefabricated pipe segment can be fixed on the seabed.

[0067] Optionally, the prefabricated pipe joint connection position 3 and the maintenance position 2 may be set only according to the actual project situation.

[0068] Based on the above embodiment, it also includes:

[0069] Step S31, while excavating from the starting positions at both ends along the preset path toward the prefabricated pipe section, lining the pipe segment 16;

[0070] Step S32, when the shield machine 1 excavates to the port seal 4 of the prefabricated pipe segment, a breaking operation is performed, and the shield machine 1 stops after excavating into the prefabricated pipe segment, and the lining of the pipe segment 16 at the port seal 4 is completed;

[0071] Step S33: If there is a maintenance pipe segment 8, when the shield machine 1 is located in the maintenance pipe segment 8, the shield machine 1 receives a signal that the maintenance is completed and then starts to build a chamber again until the shield machine 1 excavates into the docking pipe segment 10.

[0072] Both ends of the prefabricated pipe segment are provided with a port seal 4, and a main engine bracket 5 and an auxiliary hanging point 7 are provided inside the prefabricated pipe segment. After the shield machine 1 completely breaks the port seal 4 of the prefabricated pipe segment, the cutter head rotation is suspended to ensure safety during the working process. The operator enters the prefabricated pipe segment to re-measure and adjust the main engine bracket 5 or the secondary starting platform, which is located in the maintenance pipe segment 8. The shield machine 1 continues to excavate until the main engine of the shield machine 1 is pushed onto the main engine bracket 5 or the secondary starting platform and then stops, and the lining of the pipe segment 16 at the port seal 4 is completed, thereby ensuring the sealing effect of the prefabricated pipe segment.

[0073] On the basis of the above embodiment, step S1 obtains the longest theoretical maintenance distance of a single excavation of the shield machine 1 and the docking position 3 of the prefabricated pipe segment according to the construction environment and the length of the proposed tunnel; and arranges the docking pipe segment 10 at the docking position 3 by using the immersed pipe method, including:

[0074] Step S11, if S is less than or equal to 2L, where S is the length of the planned tunnel and L is the longest theoretical maintenance distance of a single excavation of the shield machine 1, then a docking position 3 is set on the planned path; if S is greater than 2L, then a docking position 3 and several maintenance positions 2 are set on the planned path.

[0075] Specifically, since at least two shield machines 1 start from both ends of the tunnel when constructing the pipeline, if the length of the proposed undersea tunnel is less than or equal to twice the longest theoretical maintenance distance of the shield machine 1 for a single excavation, only one docking position 3 is required, and there is no need to repair the shield machine 1, thereby improving the efficiency of constructing the undersea tunnel; when the length of the proposed undersea tunnel is greater than twice the longest theoretical maintenance distance of the shield machine 1 for a single excavation, the excavation distances of the shield machines 1 at both ends exceed the longest theoretical maintenance distance of the shield machine 1 for a single excavation, and therefore it is necessary to set a number of maintenance positions 2 according to actual working conditions, so as to repair the shield machine 1 at the maintenance position 2, thereby ensuring the safe use of the shield machine 1 and improving the safety of the docking of the shield machine 1.

[0076] Optionally, the length of the proposed submarine tunnel and the longest theoretical maintenance distance of a single excavation of the shield machine 1 may be determined as other relationships.

[0077] On the basis of the above embodiment, a first butt joint 10 is arranged at the butt joint position 3 by using the immersed tube method, and a port seal 4 having an axial length greater than the main machine length of the shield machine 1 is installed at the end of the first butt joint 10, and a margin value is left at the end of the port seal 4;

[0078] The first maintenance pipe segment 8 is set at the maintenance position 2 by using the immersed pipe method. The end of the first maintenance pipe segment 8 is installed with a port seal 4 whose axial length is greater than the main body length of the shield machine 1, and a margin value is left at the end of the port seal 4.

[0079] Specifically, a port seal 4 having an axial length greater than the length of the main body of the shield machine 1 is installed, a sealing door 6 is connected to the inner side of the port seal 4 and a margin value is left at the end of the port seal 4, that is, the axial length of the port seal 4 is greater than the sum of the length of the main body of the shield machine 1 and the margin value, thereby providing space for the shield tail seal of the shield machine 1.

[0080] On the basis of the above embodiment, the margin value is greater than or equal to the width of two ring segments 16 .

[0081] Specifically, a margin greater than or equal to the width of two ring segments 16 is left at the end of the port seal 4, which can ensure effective shield tail sealing and prevent external materials of the shield machine 1 from entering the prefabricated pipe section due to inadequate shield tail sealing, thereby avoiding damage to the shield machine 1.

[0082] Based on the above embodiment, the axial length of the maintenance chamber of the maintenance pipe segment 8 is greater than or equal to 1.5 times the main machine length of the shield machine 1, and the height of the maintenance chamber is greater than or equal to the sum of the maximum excavation diameter of the shield machine 1 and the maintenance margin.

[0083] Specifically, the maintenance room is the internal space of the maintenance pipe section 8 for repairing the shield machine 1. The axial length of the maintenance room is greater than or equal to 1.5 times the main body length of the shield machine 1, and the height of the maintenance room is greater than or equal to the sum of the maximum excavation diameter of the shield machine 1 and the maintenance margin.

[0084] Installing a maintenance pipe section 8 with a maintenance chamber of this size can ensure that when the shield machine 1 enters the maintenance pipe section 8, the main engine of the shield machine 1 can completely enter the maintenance chamber, thereby facilitating the operator to inspect the shield machine 1. At the same time, the maintenance margin provides operating space for the operator to inspect the top of the shield machine 1.

[0085] Optionally, a maintenance pipe section 8 having a maintenance chamber of other sizes may also be installed.

[0086] Based on the above embodiment, the axial length of the docking chamber of the docking tube 10 is greater than or equal to 4.5 times the main machine length of the shield machine 1, and the height of the docking chamber is greater than or equal to the sum of the maximum excavation diameter of the shield machine 1 and the top disassembly margin.

[0087] Specifically, the docking chamber is an internal space for docking joints 10 for docking and disassembling the shield machines 1 at both ends. A disassembled cutter disc storage area 9 is provided in the docking chamber. The axial length of the docking chamber is greater than or equal to 4.5 times the main machine length of the shield machine 1, and the height of the docking chamber is greater than or equal to the sum of the maximum excavation diameter of the shield machine 1 and the top disassembly margin.

[0088] Installing a docking pipe joint 10 with a maintenance room of this size can ensure that when the shield machines 1 at both ends enter the docking pipe joint 10, the main machines of the shield machines 1 at both ends can completely enter the docking room, thereby facilitating the operators to disassemble the shield machines 1, and providing sufficient space for storing the disassembled cutter heads of the shield machines 1 at both ends. At the same time, the top disassembly margin provides operating space for the operators to disassemble the top of the shield machine 11.

[0089] Optionally, a butt joint 10 having a butt joint chamber of other sizes may also be installed.

[0090] On the basis of any of the above schemes, step S32 is to perform a breaking operation when the shield machine 1 excavates to the port seal 4 of the prefabricated pipe segment, and stop the cutter after the shield machine 1 excavates into the prefabricated pipe segment, and complete the lining of the pipe segment 16 at the port seal 4, including:

[0091] Step S321: After the shield machine 1 excavates to a first preset position outside the prefabricated pipe segment, multiple docking measurements are performed to calibrate the relative position of the shield machine 1 and the adjacent prefabricated pipe segment;

[0092] Step S322: After the shield machine 1 continues to excavate to the second preset position according to the designed route, when the shield machine 1 continues to excavate, each time a ring of segments 16 is assembled, the segments 16 are rigidly connected to the segments 16 of the previous ring;

[0093] Step S323, when the shield machine 1 continues to excavate to the third preset position, the relative position of the shield machine 1 and the prefabricated pipe segment is re-measured, and the posture of the shield machine 1 is adjusted in real time again according to the re-measurement result, and the shield machine 1 continues to excavate until it is accurately aligned with the port seal 4 of the prefabricated pipe segment;

[0094] Step S324, adjusting the excavation parameters, the shield machine 1 continues to excavate until the end seal 4 is completely broken.

[0095] Specifically, after the shield machine 1 excavates to the first preset position, it conducts multiple docking measurements and reports to the supervision department for review, calibrates the relative position of the shield machine 1 and the adjacent prefabricated pipe segments, and formulates a strict excavation plan based on the designed route, implements it to each excavation ring distance, and adjusts the excavation parameters including adjusting the grouting material mix ratio and the synchronous grouting amount.

[0096] After the shield machine 1 advances to the first preset position, the docking measurement and position verification operations are carried out to ensure that the shield machine 1 is accurately aligned with the port seal 4 of the prefabricated pipe segment and accurately breaks the port seal 4. At the same time, after the shield machine 1 advances to the second preset position, the assembled segments 16 are rigidly connected to the segments 16 of the previous ring to prevent the thrust changes caused by the excavation of the shield machine 1 from causing the seal between the lining segments 16 to fail. The excavation parameters are adjusted. When the pressure is high or other necessary circumstances, water-stopping materials 15 and the like can be injected between the outside of the main body shell of the shield machine 1 and the prefabricated pipe segment, thereby ensuring the effective sealing between the main body shell of the shield machine 1 and the prefabricated pipe segment, and preventing other substances from entering the prefabricated pipe segment and causing damage to the shield machine 1.

[0097] Based on any of the above solutions, the opening of a position includes:

[0098] Step S331, setting a reaction frame 17 and a secondary starting platform in the maintenance pipe section 8, starting the shield machine 1 and excavating forward;

[0099] Step S332, lining the pipe segment 16 in the maintenance pipe segment 8, adjusting the posture of the shield machine 1 and aligning it with the port seal 4 on the outlet side of the maintenance pipe segment 8;

[0100] Step S333, start the circulation system, the shield machine 1 breaks the port seal 4 on the outlet side of the maintenance pipe segment 8, adjusts the excavation parameters and monitors the back-wall grouting, and uses the water-stop material 15 for synchronous grouting;

[0101] Step S334: After the shield machine 1 continues to advance forward and completely passes through the maintenance pipe segment 8, the lining segments 16 and reaction frames 17 in the maintenance pipe segment 8 are removed, and the post-grouting density of the first ring of segments 16 on the outlet side of the maintenance pipe segment 8 is re-measured.

[0102] Specifically, a reaction frame 17 is set at the rear position of the maintenance pipe section 8 located at the main body of the shield machine 1, the shield machine 1 is started, the thrust cylinder 14 acts on the reaction frame 17, and the shield machine 1 is pushed forward along the secondary starting platform. The reaction frame 17 can provide a reaction force for the shield machine 1, so that the shield machine 1 can be pushed forward, thereby ensuring the excavation of the shield machine 1.

[0103] By starting the circulation system, the debris can be discharged when the shield machine 1 breaks the port seal 4, so as to avoid the debris affecting the excavation of the shield machine 1.

[0104] After the shield machine 1 advances forward and completely passes through the maintenance pipe segment 8, the segments 16 and reaction frames 17 of the lining of the maintenance pipe segment 8 are removed to ensure the subsequent use of the maintenance pipe segment 8. At the same time, the density of the grouting behind the wall of the first ring of segments 16 on the outlet side of the maintenance pipe segment 8 is re-measured. If the density of the grouting behind the wall is poor, secondary grouting behind the wall can be carried out to ensure the sealing effect between the segments 16 and the maintenance pipe segment 8.

[0105] On the basis of any of the above schemes, step S3 includes at least two shield machines 1 respectively excavating the prefabricated pipe segment from the starting positions at both ends of the proposed tunnel along a preset path until the shield machine 1 excavates into the butted pipe segment 10, and further includes:

[0106] Step S4, sequentially disassemble and transport the rear supporting components 12 and the assembler 11 of the shield machine 1, disassemble the cutter head of the shield machine 1 and temporarily store it in the docking joint 10, disassemble and dismantle the structure in the shield machine 1 and transport it out of the tunnel, disassemble and transport the shield machine 1 in blocks, and finally transport the cutter head in blocks;

[0107] Step S5: Process the disassembled site.

[0108] Specifically, the preparatory work before dismantling includes at least the preparation of the ground storage site layout, installation of the tunnel sewage system, circulating slag cleaning, modification of the tunnel power supply system, startup of the ventilation and smoke exhaust system, secondary reinforcement of the segment 16 adjacent to the docking position 3, grouting monitoring of the wall thickness of the segment 16 at the docking position 3, and preparation for the installation of dismantling tooling.

[0109] The on-site processing after disassembly includes safety control of the disassembly site, classification management of disassembled parts, cleaning of the main engine bracket 5, and final tunnel docking processing.

[0110] The shield machine 1 is dismantled and debris is handled in sequence, which can ensure that the environment inside the butt joint 10 is suitable when the shield machine 1 is dismantled, and can ensure the safety when the shield machine 1 is dismantled.

[0111] When the operators perform maintenance or dismantling work on the shield machine 1, the ventilation and smoke exhaust system is activated.

[0112] Specifically, when the operator performs maintenance or dismantles the shield machine 1, the ventilation and smoke exhaust system is started to ensure air circulation in the maintenance pipe section 8 or the docking pipe section 10, to avoid lack of air circulation in the prefabricated pipe section causing oxygen deficiency for the operator, and to improve the safety of the operator at work.

[0113] 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.

[0114] The above is a detailed introduction to the shield immersed tube combined construction method for submarine tunnel docking provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A shield immersed tube combined construction method for submarine tunnel docking, characterized in that: include: According to the construction environment and the length of the planned tunnel, the longest theoretical maintenance distance of the shield machine in a single excavation and the docking position of the prefabricated pipe segment are obtained; Arranging a butt joint at the butt joint position by using a pipe sinking method; Determine whether it is necessary to set up a maintenance position for the prefabricated pipe segment, and if so, use the immersed tube method to set up maintenance pipe segments at the maintenance positions between the starting positions at both ends of the proposed tunnel and the butted pipe segments; At least two of the shield machines respectively excavate toward the prefabricated pipe section from the starting positions at both ends of the proposed tunnel along a preset path until the shield machines excavate into the butted pipe section; Also includes: When excavating toward the prefabricated pipe section along the preset path from the starting positions at both ends, segment lining is performed; When the shield machine excavates to the port seal of the prefabricated pipe segment, a breaking operation is performed, and after the shield machine excavates into the prefabricated pipe segment, the cutter is stopped to complete the segment lining at the port seal; If the maintenance pipe section is provided, when the shield machine is located in the maintenance pipe section, the shield machine receives a signal indicating that the maintenance is completed and starts to build a chamber again until the shield machine excavates into the butt joint; The method comprises: obtaining the longest theoretical inspection distance of a single tunneling of the shield machine and the docking position of the prefabricated pipe section according to the construction environment and the length of the proposed tunnel; and setting the docking pipe section at the docking position by using the immersed pipe method, including: If S is less than or equal to 2L, where S is the length of the proposed tunnel and L is the longest theoretical maintenance distance of a single tunneling of the shield machine, then one docking position is set on the planned path; if S is greater than 2L, then one docking position and several maintenance positions are set on the planned path; A first butt joint is arranged at the butt joint position by using a pipe sinking method, and a port seal having an axial length greater than a main machine length of the shield machine is installed at the end of the first butt joint, and a margin value is left at the end of the port seal; A first maintenance pipe section is set at the maintenance position by using the immersed tube method, and a port seal with an axial length greater than the length of the shield machine main machine is installed at the end of the first maintenance pipe section, and a margin value is left at the end of the port seal.

2. The shield immersed tube combined construction method for submarine tunnel docking according to claim 1 is characterized in that: The margin value is greater than or equal to the width of the two rings of the segments.

3. The shield immersed tube combined construction method for submarine tunnel docking according to claim 2 is characterized in that: The axial length of the maintenance chamber of the maintenance pipe segment is greater than or equal to 1.5 times the main machine length of the shield machine, and the height of the maintenance chamber is greater than or equal to the sum of the maximum excavation diameter of the shield machine and the maintenance margin.

4. The shield immersed tube combined construction method for submarine tunnel docking according to claim 3 is characterized in that: The axial length of the docking chamber of the docking tube joint is greater than or equal to 4.5 times the main machine length of the shield machine, and the height of the docking chamber is greater than or equal to the sum of the maximum excavation diameter of the shield machine and the top disassembly margin.

5. The shield immersed tube combined construction method for submarine tunnel docking according to claim 1 is characterized in that: When the shield machine excavates to the port seal of the prefabricated pipe segment, a breaking operation is performed, and after the shield machine excavates into the prefabricated pipe segment, the cutter is stopped to complete the segment lining at the port seal, including: After the shield machine excavates to a first preset position outside the prefabricated pipe segment, multiple docking measurements are performed to calibrate the relative position of the shield machine and the adjacent prefabricated pipe segment; After the shield machine continues to excavate to the second preset position according to the designed route, when the shield machine continues to excavate, each time a ring of the segments is assembled, the segments are rigidly connected to the segments of the previous ring; When the shield machine continues to advance to the third preset position, the relative position between the shield machine and the prefabricated pipe segment is remeasured, and the posture of the shield machine is adjusted in real time again according to the remeasurement result, and the shield machine continues to advance until it is precisely aligned with the port seal of the prefabricated pipe segment; The tunneling parameters are adjusted, and the shield machine continues to tunnel until the seal on the port is completely broken.

6. The shield immersed tube combined construction method for submarine tunnel docking according to claim 1 is characterized in that: The position opening includes: A reaction frame and a secondary starting platform are arranged in the maintenance pipe section, and the shield machine is started and excavated forward; Lining the pipe segment in the maintenance pipe segment, adjusting the posture of the shield machine and aligning the port seal on the outlet side of the maintenance pipe segment; The circulation system is started, the shield machine breaks the port seal on the outlet side of the maintenance pipe segment, adjusts the excavation parameters and monitors the grouting behind the wall, and performs synchronous grouting using water-stopping materials; After the shield machine continues to advance forward and completely passes through the maintenance pipe segment, the segments and reaction frames lining the maintenance pipe segment are removed, and the grouting density of the first ring of the segment wall on the outlet side of the maintenance pipe segment is remeasured.

7. The shield immersed tube combined construction method for submarine tunnel docking according to any one of claims 1 to 6, characterized in that: The at least two shield machines respectively excavate toward the prefabricated pipe section from the starting positions at both ends of the proposed tunnel along a preset path until the shield machines excavate into the butted pipe section, and further include: Sequentially disassemble and transport the rear supporting components and assembling machine of the shield machine, disassemble the cutter head of the shield machine and temporarily store it in the docking pipe joint, disassemble and remove the structure inside the shield machine and transport it out of the tunnel, disassemble the shield machine in blocks and transport it out, and finally transport the cutter head in blocks; Processing of the dismantling site.

Images