Construction process of shield machine

Abstract

The application relates to the technical field of tunnel construction, in particular to a shield machine construction process. The shield machine construction process comprises the following steps: the relative position of a cutter head and a diaphragm wall is determined through a guide system, the thrust of a jack and the torque of the cutter head; when the cutter head of the shield machine approaches the diaphragm wall, the advancing speed of the shield machine is slowed down; materials required for the subsequent advancing of the shield machine are stored in a trolley; then, the horizontal transportation track in the hole is removed to provide a working surface for the connecting passage; a grouting pipe is connected to a grouting ball valve at the shield tail of the shield machine, synchronous grouting is carried out, and the shield machine is continuously pushed forward to an assemblable position; the shield machine construction process can make the pushing out of the shield machine and the construction of the connecting passage be carried out simultaneously, so that the construction period can be reduced to a certain extent under the premise of ensuring the engineering quality.

Description

Technical Field

[0001] This invention relates to the field of tunnel construction technology, and more specifically, to a tunnel boring machine (TBM) construction process. Background Technology

[0002] Shield tunneling in urban rail transit projects differs from other tunnel construction methods. It is mostly located in urban areas and serves the dual purpose of addressing urban traffic congestion and enhancing the city's image. Some urban rail transit projects also function as supporting projects for other key infrastructure projects. Therefore, short construction periods and heavy workloads are key characteristics of shield tunneling. However, with existing technology, during the shield machine's jacking out and the construction of connecting passages, external factors can easily cause delays in the receiving process. Waiting for the receiving process to be completed before constructing the connecting passages can lead to tight schedules and potential work stoppages. Summary of the Invention

[0003] The present invention aims to provide, for example, a tunnel boring machine (TBM) construction process that allows the necessary materials for TBM propulsion to be stored inside a trolley after the TBM reaches the diaphragm wall. The horizontal transport rails inside the tunnel are then removed to create a working face for the connecting passage. When receiving conditions are met, the cutterhead is pushed out of the diaphragm wall, and grouting and tunnel entrance sealing are carried out simultaneously through ground-level pipes. This allows the TBM to be pushed out and the connecting passage construction to be carried out concurrently, thereby reducing the construction period to some extent while ensuring project quality.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] This invention provides a tunnel boring machine (TBM) construction process, including:

[0006] The relative position of the cutterhead and the diaphragm wall is determined by the guidance system, the thrust of the jacks and the torque of the cutterhead. When the cutterhead of the tunnel boring machine approaches the diaphragm wall, the advance speed of the tunnel boring machine is slowed down.

[0007] After the cutterhead of the tunnel boring machine reaches the diaphragm wall, the tunnel face is opened to check the condition of the tunnel face, and the slag inside the tunnel is removed. The materials required for the subsequent advancement of the tunnel boring machine are stored in the trolley. Then the horizontal transport track inside the tunnel is removed to provide a working face for the connecting passage.

[0008] After the cutterhead pushes out of the tunnel entrance, the grouting pipe is introduced into the tunnel boring machine from the ground through the cutterhead opening, soil chamber and personnel chamber. The grouting pipe is connected to the grouting ball valve at the tail of the tunnel boring machine for synchronous grouting. At the same time, the tunnel boring machine is pushed forward to the assembly position.

[0009] Then, the jacking continued, and the segments were assembled. Grouting was carried out continuously during the jacking and segment assembly process. The jacking was stopped before the last segment was completely removed from the tunnel at the tail of the shield, but before it was completely out of the tunnel. The tunnel entrance was then sealed.

[0010] The entire shield of the tunnel boring machine is pushed out of the tunnel.

[0011] In an optional implementation, when slowing down the tunnel boring machine's advance speed, its advance speed is less than or equal to 10 mm / min.

[0012] In an optional implementation, prior to the step of storing the materials required for subsequent tunnel boring machine (TBM) advancement inside the trolley, the TBM construction process further includes:

[0013] Based on the cutterhead mileage of the guidance system and the position from the top of the tunnel boring machine to the diaphragm wall, the number of segments to be stored in the trolley is calculated. According to the requirements of the construction process and the requirement to minimize the segment handling process, the segments are stored in the trolley in an orderly manner.

[0014] In an optional implementation, the grouting pump flow rate is 7m³ / h when grouting is injected into the tunnel boring machine through the grouting pipe. 3 / h, injection pressure less than 0.25MPa.

[0015] In an optional implementation, the tunnel boring machine (TBM) construction process further includes the following steps prior to the synchronous grouting step:

[0016] The two-component slurry is mixed on the ground, and the volume ratio of cement slurry to water glass in the two-component slurry is 1:1.

[0017] In an optional implementation, after the shield body of the tunnel boring machine is pushed out of the tunnel as a whole, a double beam is used to remove some of the tunnel segments and place them inside the tunnel to create a working surface for welding the tunnel entrance sealing steel plate, and then the power supply of the tunnel boring machine after it has exited the tunnel is cut off.

[0018] In an optional implementation, the steps for sealing the tunnel entrance include:

[0019] Two-component grout is injected into the grouting holes of the last ring segment until the two-component grout is squeezed out at the sealing curtain between the shield and the tunnel entrance to form a water-stop ring.

[0020] In an optional implementation, when injecting the two-component grout into the grouting holes, the two-component grout is injected into all grouting holes of the entire ring from bottom to top.

[0021] In an optional implementation, during the grouting process of advancing and assembling the segments, a two-component grout is injected into the multi-ring segments to form multiple water-stopping rings.

[0022] In an optional implementation, two adjacent waterstop rings are spaced 4 rings apart.

[0023] The beneficial effects of the embodiments of the present invention include:

[0024] The tunnel boring machine (TBM) construction process includes: determining the relative position of the cutterhead and the diaphragm wall using the guiding system, the thrust of the jacks, and the torque of the cutterhead; slowing down the TBM's advance speed when the cutterhead approaches the diaphragm wall; after the cutterhead reaches the diaphragm wall, opening the tunnel face to check the working face conditions, removing all excavated soil, and storing the materials needed for subsequent TBM advancement in the trolley; subsequently dismantling the horizontal transport rails inside the tunnel to provide a working face for the connecting passage; and finally, the cutterhead emerges from the tunnel portal. Then, the grouting pipe is introduced into the tunnel boring machine from the ground through the cutterhead opening, soil chamber, and personnel chamber. The grouting pipe is connected to the grouting ball valve at the tail of the tunnel boring machine for synchronous grouting. At the same time, the tunnel boring machine continues to be pushed forward to the assembly position. Then, the pushing continues, the segments are assembled, and grouting continues during the pushing and assembly of the segments. The pushing stops before the grouting hole of the last segment is removed from the tail of the tunnel, but before it is completely out of the tunnel, and the tunnel entrance is sealed. The entire shield body of the tunnel boring machine is pushed out of the tunnel.

[0025] This tunnel boring machine (TBM) construction process allows the necessary materials for TBM propulsion to be stored inside the trolley after the TBM reaches the diaphragm wall. Then, the horizontal transport rails inside the tunnel are removed to provide a working face for the connecting passage. When the receiving conditions are met, the cutterhead is pushed out of the diaphragm wall, and grouting and tunnel portal sealing are carried out simultaneously through ground-level pipes into the TBM body. This allows the TBM to be pushed out and the construction of the connecting passage to be carried out at the same time, thereby reducing the construction period to a certain extent while ensuring project quality. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a flowchart illustrating the construction process of a tunnel boring machine in an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram illustrating the storage order of the connecting bridge segments in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the storage of the tube segment on the No. 1 trolley in this embodiment of the invention;

[0030] Figure 4 This is a schematic diagram of the storage of the tube segments on trolleys No. 2 and No. 3 in an embodiment of the present invention;

[0031] Figure 5 This is a graph showing the solidification time of the two-liquid slurry in an embodiment of the present invention;

[0032] Figure 6This is a schematic diagram showing the positions of the shield and the tunnel segments in an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the injection ring number in an embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram of the injection sequence in an embodiment of the present invention. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0039] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0040] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0041] Please refer to Figure 1 This embodiment provides a tunnel boring machine construction process, including:

[0042] S1: The relative position of the cutterhead and the diaphragm wall is determined by the guide system, the thrust of the jacks and the torque of the cutterhead. When the cutterhead of the tunnel boring machine approaches the diaphragm wall, the tunnel boring machine's advancing speed is slowed down.

[0043] S2: After the top of the shield machine's cutterhead reaches the diaphragm wall, open the chamber to check the condition of the tunnel face, remove all the slag and soil from the chamber, and store the materials needed for the subsequent advancement of the shield machine in the trolley; then dismantle the horizontal transport track inside the tunnel to provide a working face for the connecting passage.

[0044] S3: After the cutterhead pushes out of the tunnel entrance, the grouting pipe is introduced into the tunnel boring machine from the ground through the cutterhead opening, soil chamber and personnel chamber. The grouting pipe is connected to the grouting ball valve at the tail of the tunnel boring machine for synchronous grouting. At the same time, the tunnel boring machine is pushed forward to the assembly position.

[0045] S4: Then continue jacking, assemble the segments, and continue grouting during the jacking and segment assembly process; stop jacking before the last ring of segments is completely out of the tunnel at the tail of the shield, and carry out the tunnel portal sealing operation.

[0046] S5: Push the entire shield body of the tunnel boring machine out of the tunnel.

[0047] The beneficial effects of the embodiments of the present invention include:

[0048] The tunnel boring machine (TBM) construction process includes: determining the relative position of the cutterhead and the diaphragm wall using the guiding system, the thrust of the jacks, and the torque of the cutterhead; slowing down the TBM's advance speed when the cutterhead approaches the diaphragm wall; after the cutterhead reaches the diaphragm wall, opening the tunnel face to check the working conditions and removing all excavated soil from the face; storing the materials needed for subsequent TBM advancement in the trolley; then dismantling the horizontal transport rails inside the tunnel to provide a working face for the connecting passage; and finally, the cutterhead emerges from the tunnel portal. Then, the grouting pipe is introduced into the tunnel boring machine from the ground through the cutterhead opening, soil chamber, and personnel chamber. The grouting pipe is connected to the grouting ball valve at the tail of the tunnel boring machine for synchronous grouting. At the same time, the tunnel boring machine continues to be pushed forward to the assembly position. Then, the pushing continues, the segments are assembled, and grouting continues during the pushing and assembly of the segments. The pushing stops before the grouting hole of the last segment is removed from the tail of the tunnel, but before it is completely out of the tunnel, and the tunnel entrance is sealed. The entire shield body of the tunnel boring machine is pushed out of the tunnel.

[0049] The working principle of this tunnel boring machine construction process is:

[0050] This tunnel boring machine (TBM) construction process allows the necessary materials for TBM propulsion to be stored inside the trolley after the TBM reaches the diaphragm wall. Then, the horizontal transport rails inside the tunnel are removed to provide a working face for the connecting passage. When the receiving conditions are met, the cutterhead is pushed out of the diaphragm wall, and grouting and tunnel portal sealing are carried out simultaneously through ground-level pipes into the TBM body. This allows the TBM to be pushed out and the connecting passage construction to be carried out at the same time, thereby reducing the construction period to a certain extent while ensuring project quality.

[0051] Furthermore, in this embodiment, the specific steps of the tunnel boring machine construction process are as follows:

[0052] The relative position of the cutterhead and the diaphragm wall is determined by the guide system, the thrust of the jacks, and the torque of the cutterhead. When the cutterhead of the tunnel boring machine approaches the diaphragm wall, the advance speed of the tunnel boring machine is slowed down. When the advance speed of the tunnel boring machine is slowed down, its advance speed is less than or equal to 10 mm / min.

[0053] After the cutterhead of the tunnel boring machine (TBM) reaches the diaphragm wall, the tunnel face is opened to check the condition of the tunnel face and the slag inside is removed. Based on the cutterhead mileage of the guidance system and the position of the TBM from the top to the diaphragm wall, the number of tunnel segment rings that need to be stored in the trolley is calculated, and the materials required for the subsequent TBM advancement are stored in the trolley. Then, the horizontal transport rails inside the tunnel are removed to provide a working face for the connecting passage. When placing the tunnel segments, the segments can be stored in the trolley in an orderly manner according to the requirements of the construction process and the requirement to minimize the segment handling process, so as to facilitate the subsequent installation of the segments.

[0054] After the cutterhead emerges from the tunnel entrance, the grouting pipe is introduced into the tunnel boring machine (TBM) from the ground through the cutterhead opening, soil chamber, and personnel chamber. The grouting pipe is then connected to the grouting ball valve at the tail of the TBM for synchronous grouting. Simultaneously, the TBM continues to advance forward to the assembly position. While grouting the TBM through the grouting pipe, a two-component grout can be mixed on the ground, with the cement slurry and water glass having a volume ratio of 1:1. Furthermore, the grouting pump has a flow rate of 7 m³ / h and an injection pressure of less than 0.25 MPa.

[0055] The jacking process continues, with segment assembly and grouting ongoing throughout. Jacking stops before the shield completely exits the tunnel at the grouting hole of the last segment, involving tunnel portal sealing. This includes injecting a double-liquid grout into the grouting hole of the last segment until it is squeezed out at the sealing fabric between the shield and the tunnel portal, forming a water-stop ring. The double-liquid grout is injected from bottom to top into all grouting holes of the entire ring. In this embodiment, multiple water-stop rings are used. Specifically, during the grouting process, multiple segments are injected with double-liquid grout to form multiple water-stop rings. Adjacent water-stop rings are spaced four segments apart.

[0056] The shield machine is pushed out of the tunnel as a whole; then, double beams are used to remove some segments and place them inside the tunnel to create a working surface for welding the tunnel entrance sealing steel plate, and then the power supply to the shield machine after it exits the tunnel is cut off.

[0057] In summary, based on the above, taking a specific tunnel section as an example of an underground shield tunnel, the construction process of this shield tunneling machine is as follows:

[0058] First, the tunnel section has four sets of horizontal curves. The radii of the right-line curves are 1300m, 700m, 450m, and 450m, respectively, while the radii of the left-line curves are 1200m, 600m, 450m, and 450m, respectively. The left and right lines of the section adopt a V-shaped slope, with a maximum longitudinal slope of 21.016‰ and a minimum longitudinal slope of 2‰. The minimum burial depth of the tunnel is 8.96m, and the maximum burial depth is 20.88m. The section includes a connecting passage / pump station, with its center mileage at DK14+145.752 (ZDK14+148.465). The machinery and materials required for the shield tunneling process after track removal are detailed in the table below.

[0059]

[0060] Material and Equipment Configuration Table

[0061] Because the horizontal transport track inside the tunnel has been removed, it is difficult to transport and replace damaged parts. Therefore, vulnerable parts need to be prepared in advance inside the tunnel. According to the existing statistics on tunnel boring machine failures, the double-rail beam reduction motor, the oil pipe of the assembly machine, the solenoid valve of the assembly machine and the air pipe are the parts that are prone to damage during construction. The vulnerable parts stored in the trolley are shown in the vulnerable parts configuration table of the tunnel boring machine.

[0062]

[0063] List of Vulnerable Components of Tunnel Boring Machine

[0064] First, the cutterhead is brought close to the diaphragm wall: When the cutterhead of the tunnel boring machine approaches the diaphragm wall, the advancing speed should be slowed down and should not exceed 10 mm / min. At the same time, the position of the cutterhead and the diaphragm wall should be judged by comprehensively considering the mileage of the guide system, the thrust of the jacks and the torque of the cutterhead to avoid damage to the cutter and unnecessary economic losses. After reaching the diaphragm wall, the chamber should be opened to check the condition of the working face and the muck should be removed as much as possible.

[0065] Material storage in the tunnel boring machine (TBM) trolley: After the cutterhead reaches the diaphragm wall, the tunnel segments, bolts, etc., required for subsequent advancement are stored in the trolley. The number of tunnel segment rings to be stored in the trolley is calculated based on the cutterhead mileage of the TBM's guiding system and the position from the top of the TBM to the diaphragm wall. The tunnel segments are then stored in the trolley in an orderly manner according to the requirements of the construction sequence and to minimize the number of segment handling procedures. Please refer to [reference needed]. Figure 2The diagram illustrates the storage sequence of the tunnel segments under the connecting bridge in this embodiment. When the cutterhead tip reaches the diaphragm wall in this shield tunnel section, the assembled ring number is 989, and the designed ring quantity is 995. Therefore, the trolley should store 7 assembled rings plus three large three-piece ejector segments. The segments should be numbered 1-7 according to the assembly sequence. Four rings of segments are stored under the connecting bridge; special attention should be paid to the lifting limit range of the secondary crane during storage. Trolleys 1-3 store 3 rings plus 3 segments. Please refer to... Figure 3 , Figure 3 The diagram shows the storage sequence of the tunnel segments on trolley No. 1. Trolley No. 1 places the segments directly onto the track to prevent two piles; each pile contains four segments, supported by small square timbers. Please refer to the diagram. Figure 4 , Figure 4 The storage order of the tunnel segments on trolleys 2 and 3 is shown; the tunnel segments within the range of trolleys 2 and 3 are stacked on 4 flatbed trolleys and pulled by 55T battery-powered locomotives, and can move horizontally within the trolleys; when there is a difference between the exit ring and the inner ring, special attention should be paid to ensuring that the placement order of the tunnel segments conforms to the tunnel segment assembly order.

[0066] Tunnel boring machine cutterhead pushes out of the tunnel portal: After the tunnel boring machine cutterhead pushes out of the tunnel portal, the grouting pipe is introduced from the ground through the cutterhead opening through the soil chamber and the personnel chamber into the tunnel boring machine. The pipe is connected to the grouting ball valve at the tail of the shield to start synchronous grouting. At the same time, the tunnel boring machine continues to be pushed forward to the assembly position.

[0067] Segment assembly: When assembling segment 1, it is assembled according to [1]B2→[1]B1→[1]B3→[1]L1→[1]L2→[1]F. The assembly quality is strictly controlled during the assembly. Then continue to push forward and assemble segments 2, 3, and 4. Grouting is continuously carried out during the pushing and assembly process. After the segment assembly under the connecting bridge is completed, segments 5-7 stored in the assembly trolley are lifted by electric hoist due to the lifting limit of the primary crane. Then the electric hoist moves forward and places the segment on the plate of the next segment before normal lifting can be carried out. After the 7-ring segment is assembled, part of the shield is still in the tunnel. At this time, [8]B2 is placed to push forward the shield. Then [9]B3 and

[10] B3 are placed in an orderly manner to continue pushing forward until the shield tail comes out of the 995 ring grouting hole but does not completely exit the tunnel. Then stop pushing forward and carry out the tunnel portal sealing operation.

[0068] Synchronous grouting: Due to track removal, synchronous grouting slurry is introduced into the tunnel boring machine (TBM) from the receiving end via grouting pipes. Considering the grouting pump flow rate of 7 m³ / h, simple grouting during tunneling cannot guarantee full filling of the gaps in the shield tail structure. Therefore, grouting can continue during assembly. The actual grouting time is controlled by the grouting volume and pressure, with the pressure controlled below 0.25 MPa. After the grouting hole of segment 7 (i.e., the last ring of the design ring, 995 rings) exits the shield tail, jacking is stopped before the entire ring of segments exits the shield tail. Double-liquid grout is injected into the radial grouting holes of segment 7 to seal the tunnel entrance and prevent seal failure after the TBM exits the tunnel. The double-liquid grout is injected from bottom to top, with the grout being squeezed out at the sealing curtain between the shield body and the tunnel entrance. Technicians need to confirm whether the grout squeezed out of the gap is double-liquid grout. All 16 grouting holes in the entire ring need to be injected.

[0069] Injection sealing ring: First, the two-component grout mix is ​​prepared. Due to the limited space inside the trolley and the significant heat dissipation during cement grout mixing, the two-component grout mixing is also carried out on the ground. In this case, the possibility of pipe blockage due to the long pipeline needs to be considered, requiring adjustments to the two-component grout mix ratio to delay the initial setting time. Please refer to... Figure 5 , Figure 5 The setting time curves of the cement-water glass slurry are shown. Based on the characteristics of the cement-water glass slurry, the cement content per unit volume has a significant impact on the setting time. Setting curves for different proportions of water glass are also presented when the water-cement ratio is 0.75:1. Figure 5 It can be seen that when the volume ratio of cement slurry to water glass is 1:1, the solidification time of the two-component slurry is 120 seconds, which basically meets the injection requirements and the requirement for the instantaneous solidification of the slurry. Therefore, the final determination of the two-component slurry ratio is 1:1.

[0070] Then, the tunnel portal ring is sealed. After the grouting hole of segment 7 (i.e., the last ring of the design ring, 995 rings) exits the shield tail, the jacking is stopped before the entire ring of segments exits the shield tail; please refer to Figure 6 , Figure 6 The locations of the shield body and tunnel segments are shown. Two-component grout is injected into the radial grouting holes of segment 7 to seal the tunnel entrance and prevent seal failure after the tunnel boring machine exits the tunnel. The two-component grout is injected from bottom to top, with the grout being squeezed out at the sealing fabric between the shield body and the tunnel entrance. Technicians must confirm that what is squeezed out of the gap is indeed two-component grout. All 16 grouting holes in the entire ring must be injected.

[0071] Subsequently, based on the injection ring number and location, and considering the different water content and permeability of the strata, there are various arrangements for the tunnel boring machine's exit water-stop rings; taking the installation of three water-stop rings as an example, one ring is installed every 5 rings, please refer to... Figure 7 , Figure 7 The injection ring numbers are shown: ring 995, ring 990, and ring 985. Each ring has a total of 16 injection holes. Please refer to the provided text. Figure 8 , Figure 8The injection sequence is shown, and injections must be performed strictly in a bottom-up order.

[0072] Shield body ejection: After the 995 ring water-stop ring is injected, the shield body of the shield machine is ejected into the tunnel as a whole. After exiting the tunnel, the shield machine does not cut off the high voltage first. Instead, it uses double beams to remove [8]B1, [9]B2, and

[10] B2 and place them in the tunnel to create a working surface for welding the tunnel door sealing steel plate.

[0073] In the above process, the following points should be noted:

[0074] (1) When storing tunnel segments, various limiting factors should be considered according to local conditions, such as the travel limits of the assembly machine and the crane. The primary principle is to meet the transportation and assembly needs of the tunnel segments, and the secondary principle is to reduce the number of times the tunnel segments are transported.

[0075] (2) The battery of the battery vehicle should be fully charged during its last entry into the tunnel. If possible, the battery should be maintained. The tunnel boring machine should be pushed out at a uniform and slow speed, matching the synchronous grouting speed.

[0076] (3) When storing the tunnel segments, the length of the trolley track connection should be considered to avoid the tunnel segments restricting the extension of the trolley track;

[0077] (4) If the segment cannot be lifted by the crane limiter on the flatbed truck, consider using an electric hoist to lift it and then move it to another flatbed truck, or remove the anti-collision beam so that the electric truck can move back to the corresponding position;

[0078] (5) To prevent difficulties in lifting with a crane, when stacking the segments, lower one end of the segment in the tunneling direction and raise the other end;

[0079] (6) Pay attention to the grouting pipeline during the advancement to avoid breaking the grouting pipeline;

[0080] (7) The synchronous grouting pressure should not be too high after the shield tail enters the reinforced area. At this time, the shield body is in the reinforced soil, the permeability coefficient is zero, and the grouting pressure is directly borne by the segments. Excessive pressure may cause the segments to break.

[0081] (8) After the tunnel boring machine has fully emerged, do not cut off the high voltage power to the tunnel boring machine first. Use a double-rail beam crane to remove [T]B2 first to create a working surface for welding the tunnel portal sealing steel plate.

[0082] In summary, this tunnel boring machine (TBM) construction technique effectively addresses the issue of delayed reception work due to external factors. Waiting for the reception work to be completed before constructing the connecting passage would lead to a tight schedule and potential downtime. Therefore, by first pushing the cutterhead to the diaphragm wall and storing the necessary materials in the trolley, and then removing the horizontal transport rails inside the tunnel to create a working face for the connecting passage, the cutterhead is pushed out of the diaphragm wall when reception conditions are met. Simultaneous grouting and tunnel portal sealing are then carried out through surface-mounted pipes within the shield. This method resolves the time constraints caused by unmet reception conditions, resulting in significant social and economic benefits.

[0083] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A tunnel boring machine construction process, characterized in that, include: The relative position of the cutterhead and the diaphragm wall is determined by the guiding system, the thrust of the jacks and the torque of the cutterhead. When the cutterhead of the tunnel boring machine approaches the diaphragm wall, the advancing speed of the tunnel boring machine is slowed down. After the cutterhead of the tunnel boring machine reaches the diaphragm wall, the tunnel face is opened to check the condition of the tunnel face, and the slag inside the tunnel is removed. The materials required for the subsequent advancement of the tunnel boring machine are stored in the trolley. Then, the horizontal transport track inside the tunnel is removed to provide a working face for the connecting passage. After the cutterhead pushes out of the tunnel entrance, the grouting pipe is introduced into the tunnel boring machine from the ground through the cutterhead opening, the soil chamber and the personnel chamber. The grouting pipe is connected to the grouting ball valve at the tail of the tunnel boring machine for synchronous grouting. At the same time, the tunnel boring machine is pushed forward to the assembly position. Then, the jacking continued, and the segments were assembled. Grouting was continuously carried out during the jacking and segment assembly process. The jacking was stopped before the last segment of the shield exited the tunnel completely through the grouting hole, and the tunnel entrance was sealed. The entire shield of the tunnel boring machine is pushed out of the tunnel.

2. The tunnel boring machine construction process according to claim 1, characterized in that: When the tunnel boring machine's advance speed is slowed down, its advance speed is less than or equal to 10 mm / min.

3. The tunnel boring machine construction process according to claim 1, characterized in that: Prior to the step of storing the materials required for the subsequent advancement of the tunnel boring machine (TBM) inside the trolley, the TBM construction process further includes: Based on the cutterhead mileage of the guidance system and the position from the top of the tunnel boring machine to the diaphragm wall, the number of segments to be stored in the trolley is calculated. According to the requirements of the construction process and the requirement to minimize the segment handling process, the segments are stored in the trolley in an orderly manner.

4. The tunnel boring machine construction process according to claim 1, characterized in that: When grout is injected into the tunnel boring machine through the grouting pipe, the grouting pump flow rate is 7m³ / h. 3 / h, injection pressure less than 0.25MPa.

5. The tunnel boring machine construction process according to claim 1, characterized in that: Prior to the step of simultaneous grouting, the tunnel boring machine construction process also includes: The two-component slurry is mixed on the ground, and the volume ratio of cement slurry to water glass in the two-component slurry is 1:

1.

6. The tunnel boring machine construction process according to claim 1, characterized in that: After the step of pushing the shield body of the tunnel boring machine out of the tunnel as a whole, a portion of the tunnel segments are removed and placed inside the tunnel using double beams to create a working surface for welding the tunnel entrance sealing steel plate, and then the power supply to the tunnel boring machine after it exits the tunnel is cut off.

7. The tunnel boring machine construction process according to any one of claims 1-6, characterized in that: The steps for sealing the tunnel entrance include: Two-component grout is injected into the grouting holes of the last ring of the tunnel segment until the two-component grout is squeezed out at the sealing curtain of the shield body and the tunnel entrance to form a water-stop ring.

8. The tunnel boring machine construction process according to claim 7, characterized in that: When injecting the dual-liquid grout into the grouting holes, the dual-liquid grout is injected into all the grouting holes of the entire ring from bottom to top.

9. The tunnel boring machine construction process according to any one of claims 1-6, characterized in that: During the process of advancing and assembling the segments, grouting is continuously performed, and two-component grout is injected into multiple rings of the segments to form multiple water-stopping rings.

10. The tunnel boring machine construction process according to claim 9, characterized in that: The adjacent water-stopping rings are spaced 4 rings apart in the pipe segment.

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