Two-way double-line shield steel sleeve launching construction method for assembled station

Abstract

This invention discloses a method for launching four prefabricated double-track shield tunneling machines (TBMs) using steel sleeves. The method employs a "one station, two launches" configuration, with all four TBMs launching using steel sleeves. During the launch phase, all four muck exits occupy the shaft openings. During launch, muck is either moved across the track or transported to another launch shaft on the same side for muck removal. Given the limitations of prefabricated station muck exits and the use of steel sleeve launching technology, the conventional method for muck removal by each TBM is to remove its own steel sleeve before it can remove muck from its respective launch shaft. When the spacing and size of the prefabricated muck exits do not meet the requirements for shield launching, a battery-powered muck transport route is provided by laying tracks on the curved base plate and using cross-track turnouts. This allows for simultaneous launching of all four TBMs, ensuring normal tunneling for each machine and shortening the construction period. This invention solves the problems of difficult muck removal in prefabricated stations and the inability to remove muck from the same side of the shaft.

Description

Technical Field

[0001] This invention relates to the field of tunnel boring machine (TBM) construction technology, specifically to a method for launching a prefabricated double-track TBM with a steel sleeve. Background Technology

[0002] Existing bidirectional tunnel boring machine (TBM) launching systems are primarily based on cast-in-place stations. In some cases, prefabricated stations employ bidirectional, double-track launching, with all four TBMs using a steel sleeve launching process. With the steel sleeve launching process, the steel sleeve and trailer occupy the muck discharge port at the launching end during TBM launching, preventing muck discharge and material lowering (such as tunnel segments) from the launching shaft until the steel sleeve is removed. The structural design of cast-in-place stations differs from that of prefabricated stations, primarily in two aspects: firstly, the pre-reserved TBM excavation exit port in prefabricated stations is smaller, failing to meet the requirements for conventional muck discharge from the TBM's muck hopper; secondly, the launching shaft of prefabricated stations is closer to the TBM excavation exit port, making it impossible to discharge muck from the same side.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, a method for launching prefabricated double-track shield tunneling steel sleeves is provided to solve the problems of difficult muck removal in prefabricated stations and the inability to remove muck from the same side muck outlet.

[0005] To achieve the above objectives, a method for launching prefabricated double-track shield tunneling steel sleeves for railway stations is provided, comprising the following steps:

[0006] The construction of a prefabricated station includes a small mileage end and a large mileage end, with the middle section being the assembly section. The small mileage end and the large mileage end are cast in place sequentially. The prefabricated station also has a left and a right side, with multiple supports installed on the left and right sides of the arc-shaped base plate in the middle of the prefabricated station.

[0007] A left-line track and a right-line track are laid on multiple supports on the left and right sides of the arc-shaped base plate, and a cross-line turnout is erected between the middle of the left-line track and the right-line track.

[0008] The first shield tunneling machine is lowered into the starting shaft of the right line at the small mileage end and excavated. The excavated soil from the first shield tunneling machine passes through the right line track, the overpass turnout and the left line track in sequence and is discharged through the starting shaft of the left line at the small mileage end.

[0009] The second shield tunneling machine is lowered into the starting shaft of the left line at the high mileage end and excavated. The excavated soil from the second shield tunneling machine passes through the left line track, the overpass turnout and the right line track in sequence and is discharged through the starting shaft of the right line at the high mileage end.

[0010] After the steel sleeves of the first and second shield tunnels are removed, the third shield tunnel is launched and excavated via the left-line starting shaft at the low mileage end, and the fourth shield tunnel is launched and excavated via the right-line starting shaft at the high mileage end. At the same time, the excavated soil from the third shield tunnel passes through the left-line track and is discharged via the left-line starting shaft at the high mileage end, and the excavated soil from the fourth shield tunnel passes through the right-line track and is discharged via the right-line starting shaft at the low mileage end.

[0011] Furthermore, the support includes:

[0012] A horizontal beam is provided along the width direction of the prefabricated station, and the left or right track is laid on the horizontal beam of the multiple supports.

[0013] Multiple support legs are installed on the arc-shaped base plate, and the multiple support legs are spaced apart along the length direction of the horizontal beam.

[0014] Furthermore, the outrigger is bolted to the bolt holes of the arc-shaped base plate.

[0015] Furthermore, the legs of the horizontal beams of the multiple supports, near the central axis of the prefabricated station, are connected with connecting ribs.

[0016] Furthermore, one end of the horizontal beam of the support near the central axis of the prefabricated station is connected to the arc-shaped base plate by a diagonal brace.

[0017] The beneficial effect of this invention is that the prefabricated station bidirectional double-track shield tunneling steel sleeve launching construction method of this invention involves a total of four shield machines launching from the front and rear. According to the design launching requirements, all four shield machines use steel sleeves for launching. Therefore, the four excavation ports occupy the wellhead when the shield machines are launching. During the launching stage (before the steel sleeves are removed), it is necessary to cross the line (left and right lines) or move the muck truck to another launching well on the same side for muck discharge. Therefore, when the reserved muck discharge ports of the prefabricated station are limited and the steel sleeve launching process is adopted, the conventional muck discharge method for the four shield machines is that muck can be discharged at their respective launching wellheads only after each shield machine has removed the steel sleeves used for its own launching. The prefabricated station bidirectional double-track shield tunneling steel sleeve launching construction method of the present invention addresses the issue that the reserved excavation opening spacing and size do not meet the requirements for shield tunneling launching, and the bottom plate has an arc structure. It is necessary to lay out the corresponding structural form of the trestles and cross-line turnouts to provide the battery-powered vehicle muck transportation line, so as to meet the requirement of simultaneous launching of four shield machines. It is necessary to plan the launching mode of the four shield machines in the early stage of launching to ensure that each shield machine can tunnel normally and shorten the construction period.

[0018] The prefabricated station bidirectional double-track shield steel sleeve launching construction method of the present invention improves space utilization by adopting a bidirectional double-track launching form. After the steel sleeve is removed, the tunnel can be fully assembled and launched. The bidirectional launching of four shields not only ensures the timely completion of the launching node, but also reduces the construction of related supporting facilities, reduces the workload of dismantling related facilities in the later stage, saves a lot of manpower and material resources, and generates significant economic benefits. The application effect is particularly prominent in the bidirectional launching of prefabricated stations. Attached Figure Description

[0019] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0020] Figure 1 This is a structural schematic diagram of a prefabricated station according to an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the support structure according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of a cross-line turnout according to an embodiment of the present invention.

[0023] Figures 4 to 6 This is a schematic diagram illustrating the steps of the prefabricated station bidirectional double-track shield tunneling steel sleeve initiation construction method according to an embodiment of the present invention. Detailed Implementation

[0024] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] Reference Figures 1 to 6 As shown, this invention provides a method for launching a prefabricated double-track shield tunnel with steel sleeve, comprising the following steps:

[0027] S1: See Figures 1 to 3 The prefabricated station 1 is constructed. The prefabricated station 1 has a relatively small mileage end a and a relatively large mileage end b. The middle part of the prefabricated station 1 is the assembly section. The small mileage end a and the relatively large mileage end b are cast in place in sequence. The prefabricated station 1 has a relatively left side A and a right side B. Multiple supports 2 are installed on the left and right sides of the arc-shaped base plate in the middle of the prefabricated station 1.

[0028] In this embodiment, the prefabricated station includes a prefabricated middle section and two terminals, a small mileage end and b large mileage end. Terminals a and b are cast-in-place. The prefabricated middle section employs a prefabricated structure, such as precast tunnel segments assembled together.

[0029] Except for the two end wellheads of the prefabricated station, which are cast-in-place sections, the rest are not prefabricated sections. The bottom plate is assembled from arc-shaped prefabricated components. According to the design requirements, no holes should be made on the bottom plate of the prefabricated components.

[0030] The prefabricated station has two launching shafts at its lower mileage end (a) and higher mileage end (b). The prefabricated station 1 has opposing left-side (A) and right-side (B) sections. Therefore, in this embodiment, the prefabricated station is a bidirectional, dual-track launching station, meaning it can be launched by four tunnel boring machines (TBMs).

[0031] Specifically, in this embodiment, the support 2 includes a horizontal beam 21 and multiple legs 22.

[0032] The horizontal beam 21 is set along the width direction of the prefabricated station 1. The left or right track is laid on the horizontal beam of multiple supports 2.

[0033] Multiple support legs 22 are installed on the curved base plate. The multiple support legs are spaced apart along the length of the horizontal beam.

[0034] The outriggers are bolted to the bolt holes in the curved base plate.

[0035] The legs of the horizontal beams of multiple supports 2, near the central axis of the prefabricated station 1, are connected with connecting bars.

[0036] One end of the horizontal beam of the support 2, near the central axis of the prefabricated station 1, is connected to the arc-shaped base plate by a diagonal brace 23.

[0037] When installing the support for the station floor assembly section, one end is placed above the precast segment platform (overlap not less than 10cm), and the other four legs are placed on the inner arc surface of the segment.

[0038] During the installation of the support frame, the two end legs are first fixed according to the measurement and layout. The spacing between each support frame is 1m. Then, the other supports are installed by pulling the line to ensure that the two end faces of the support frame are flush. Since the station floor is an arc-shaped structure, the processing precision of the support frame is required to be high. If the support legs are suspended during the installation process, uniform padding is applied after the installation is completed to ensure that each support leg is in close contact with the inner arc surface of the segment.

[0039] After the bracket is installed, it is reinforced. The reinforcement uses 12# channel steel to connect the middle of the side legs and the side of the upper surface of the bracket, connecting all the brackets into a whole. The channel steel and the 200H contact surface with the bracket are fully welded and fixed.

[0040] After the two sides of the support legs are reinforced, the middle support leg is longitudinally connected with steel bars of 20mm diameter, and the steel bars are firmly welded to the contact surface of the support leg.

[0041] If the outriggers become suspended during installation, use 0.5-2cm thick steel plates for support in the well. When using support, the bottom steel plate pads must be welded and fixed to the outriggers.

[0042] The support legs are fixed by diagonal bracing with 14# I-beams at the bolt holes of the precast segments. One end of the diagonal brace is fixed to the segment hoisting hole, and the other end is welded to the support leg. The weld should be full. The diagonal brace reinforcement method is to brace every other one (mainly corresponding to the precast segment hoisting hole) as the main stress reinforcement measure for the support.

[0043] During the use of the support, the deformation of the support under stress is obtained by measuring the monitoring points deployed on the support, thereby judging its stress stability.

[0044] S2: A left-line track and a right-line track are laid on multiple supports 2 on the left and right sides of the arc-shaped base plate, and a cross-line turnout 31 is erected between the middle of the left-line track and the right-line track.

[0045] After the middle section of the prefabricated station is formed, multiple supports are installed on the curved base plate of the middle section. Tracks are then laid on these supports, such as... Figure 1 and Figure 2As shown. The prefabricated station has cross-track turnouts connecting the tracks on both sides, as shown. Figure 3 As shown.

[0046] According to the design requirements of the starting centerline, track laying control points are set on the support. During the track laying process, the flatness and lateral offset are re-measured by measuring the control positioning points to ensure the safe operation of the tunnel boring machine trailer and battery car and to meet the starting requirements.

[0047] During the installation of cross-line turnouts, due to the structural characteristics of prefabricated stations and the steel sleeve launching process, the steel sleeve and trailer occupy the muck discharge port at the launching end when the tunnel boring machine starts. The muck needs to be discharged across the lines (from the right line to the left line muck discharge port). Therefore, it is necessary to install a cross-line turnout as the route for muck trucks.

[0048] During the installation of turnouts, simulation calculations need to be performed based on the spacing between the columns in the prefabricated station base plate and the minimum turning radius of the dump truck.

[0049] During the installation of turnouts, right-angle track gauges and universal track gauges are used to adjust the level, height, elevation, gauge, and direction of the rails.

[0050] After the rails are properly adjusted and secured, a no-load test run is conducted. During the test run, any rail wear or misalignment is observed and addressed promptly to ensure that subsequent dump trucks can safely and smoothly pass through the turnout.

[0051] S3: The first shield tunnel 4 is lowered into the starting shaft of the right line at the small mileage end a and excavated. The slag from the first shield tunnel 4 passes through the right line track, the overpass turnout 31 and the left line track in sequence and is discharged through the starting shaft of the left line at the small mileage end a.

[0052] See Figure 4 After the first shield tunnel 4 was lowered into the starting shaft of the right line at the low mileage end a and began excavation, the second shield tunnel and its supporting equipment were being lowered into the starting shaft of the left line at the high mileage end.

[0053] The excavation route of the first tunnel boring machine is shown by the solid arrow.

[0054] This phase involves the initial excavation and muck removal on the right line at the lower mileage. Since the muck removal requirements at the higher mileage end of the right line are not met, the electric trolley needs to cross the turnout and change tracks to reach the left line at the lower mileage end for muck removal. Meanwhile, at the higher mileage end on the left line, the tunnel boring machine and its supporting equipment are being lowered into the shaft for assembly and commissioning.

[0055] S4: The second shield tunnel 5 is lowered into the starting shaft of the left line at the high mileage end b and excavated. The slag from the second shield tunnel 5 passes through the left line track, the overpass turnout 31 and the right line track in sequence, and is discharged through the starting shaft of the right line at the high mileage end b.

[0056] See Figure 5 The first shield tunnel has been excavating normally towards the small mileage direction of the tunnel, and its excavated soil has been transported back to the starting shaft of the right line at the small mileage end and excavated.

[0057] The second tunnel boring machine (TBM) began excavating towards the greater mileage of the tunnel, and the route for excavated soil is shown by the hollow arrow in the figure.

[0058] Meanwhile, the third and fourth tunnel boring machines (TBMs) began to be lowered into the starting shafts of the left line at the lower mileage end and the right line at the higher mileage end of the prefabricated station.

[0059] This stage marks the start of tunneling for the left-line tunnel boring machine at the high mileage, while the right-line tunnel boring machine at the low mileage is currently in the initial stage of tunneling construction.

[0060] S5: After the steel sleeves of the first shield tunnel 4 and the second shield tunnel 5 are removed, the third shield tunnel 6 will be lowered into the left-line starting shaft at the small mileage end a and excavated, and the fourth shield tunnel 7 will be lowered into the right-line starting shaft at the large mileage end b and excavated. At the same time, the slag from the third shield tunnel 6 will pass through the left-line track and be discharged through the left-line starting shaft at the large mileage end b, and the slag from the fourth shield tunnel 7 will pass through the right-line track and be discharged through the right-line starting shaft at the small mileage end a.

[0061] like Figure 5 As shown, the excavated soil from the third shield tunnel runs along the left track 3 of the prefabricated station and exits through the starting shaft of the left track at the large mileage end. The specific excavated soil exit route is shown by the linear arrow.

[0062] The excavated soil from the fourth tunnel boring machine was discharged along the right track of the prefabricated station and through the starting shaft of the right track at the small mileage end. The specific excavated soil discharge route is shown by the double hollow arrows.

[0063] This phase involves the launch of tunnel boring machines (TBMs) for the right line at the high mileage and the left line at the low mileage. During this phase, the excavation of the starting section and the removal of the steel sleeve by the TBM on the right line at the low mileage have been completed. Excavation from both the right and low mileage TBMs is being carried out in full formation at the right end shaft of the low mileage. Excavation from both the left and low mileage lines is being carried out at the left end shaft of the high mileage.

[0064] The prefabricated station bidirectional double-track shield tunneling steel sleeve launching construction method of the present invention involves a total of four shield machines launching from the front and rear. According to the design launching requirements, all four shield machines use steel sleeves for launching. Therefore, all four excavation ports occupy the wellhead when the shield machines are launching. During the launching stage (before the steel sleeves are removed), it is necessary to cross the line (left and right lines) or move the muck truck to another launching well on the same side for muck discharge. Therefore, when the reserved muck discharge ports of the prefabricated station are limited and the steel sleeve launching process is adopted, the conventional muck discharge method for the four shield machines is to discharge muck at their respective launching wellheads only after each shield machine has removed its own steel sleeve during launching. The prefabricated station bidirectional double-track shield tunneling steel sleeve launching construction method of the present invention addresses the issue that the reserved excavation opening spacing and size do not meet the requirements for shield tunneling launching, and the bottom plate has an arc structure. It is necessary to lay out the corresponding structural form of the trestles and cross-line turnouts to provide the battery-powered vehicle muck transportation line, so as to meet the requirement of simultaneous launching of four shield machines. It is necessary to plan the launching mode of the four shield machines in the early stage of launching to ensure that each shield machine can tunnel normally and shorten the construction period.

[0065] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A method for launching prefabricated double-track shield tunneling steel sleeves for railway stations, characterized in that, Includes the following steps: The construction of a prefabricated station includes a small mileage end and a large mileage end, with the middle section being the assembly section. The small mileage end and the large mileage end are cast in place sequentially. The prefabricated station also has a left and a right side, with multiple supports installed on the left and right sides of the arc-shaped base plate in the middle of the prefabricated station. A left-line track and a right-line track are laid on multiple supports on the left and right sides of the arc-shaped base plate, and a cross-line turnout is erected between the middle of the left-line track and the right-line track. The first shield tunneling machine is lowered into the starting shaft of the right line at the small mileage end and excavated. The excavated soil from the first shield tunneling machine passes through the right line track, the overpass turnout and the left line track in sequence and is discharged through the starting shaft of the left line at the small mileage end. The second shield tunneling machine is lowered into the starting shaft of the left line at the high mileage end and excavated. The excavated soil from the second shield tunneling machine passes through the left line track, the overpass turnout and the right line track in sequence and is discharged through the starting shaft of the right line at the high mileage end. After the steel sleeves of the first and second shield tunnels are removed, the third shield tunnel is launched and excavated via the left-line starting shaft at the low mileage end, and the fourth shield tunnel is launched and excavated via the right-line starting shaft at the high mileage end. At the same time, the excavated soil from the third shield tunnel passes through the left-line track and is discharged via the left-line starting shaft at the high mileage end, and the excavated soil from the fourth shield tunnel passes through the right-line track and is discharged via the right-line starting shaft at the low mileage end.

2. The prefabricated station bidirectional double-track shield tunneling steel sleeve launching construction method according to claim 1, characterized in that, The support includes: A horizontal beam is provided along the width direction of the prefabricated station, and the left or right track is laid on the horizontal beam of the multiple supports. Multiple support legs are installed on the arc-shaped base plate, and the multiple support legs are spaced apart along the length direction of the horizontal beam.

3. The prefabricated station bidirectional double-track shield tunneling steel sleeve launching construction method according to claim 2, characterized in that, The outriggers are bolted to the bolt holes of the arc-shaped base plate.

4. The prefabricated station bidirectional double-track shield tunneling steel sleeve launching construction method according to claim 2, characterized in that, The legs of the horizontal beams of the multiple supports, near the central axis of the prefabricated station, are connected with connecting ribs.

5. In the prefabricated station bidirectional double-track shield tunneling steel sleeve starting construction method according to claim 4, one end of the horizontal beam of the support near the central axis of the prefabricated station is connected to the arc-shaped base plate by a diagonal brace.

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