Water stop structure for vertical jacking construction method, tunnel structure and tunnel construction method

Abstract

The invention relates to a water stop structure for a vertical jacking construction method, a tunnel structure and a tunnel construction method. The structure comprises a water stop frame which is arranged on the inner side of a tunnel segment and surrounds a segment opening by a circle, and further comprises a sealing ring, an oil immersion packing unit and a grouting hole, a first check block is arranged on the inner side wall of the water stop frame, and a sealing area is formed among the first check block, the water stop frame and a vertical pipe mechanism; the sealing ring and the oil immersion packing unit are respectively extruded and filled in the sealing area, the sealing ring is positioned above the oil immersion packing unit, and the grouting hole is formed in the inner side wall of the water stop frame and is communicated with the sealing area. The inner side wall of the water stop frame is provided with the sealing ring, the grouting hole and the oil immersion packing, the waterproof effect is good, and seawater leakage in the jacking process and after jacking can be avoided; the grouting holes and the oil-immersed packing are arranged in a combined mode, the oil-immersed packing is not dismantled in the construction period, the leakage risk in the construction period is avoided, and the oil-immersed packing is used for temporary water stopping and also used for water stopping in the operation period.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel engineering, and in particular to a water-stop structure, a tunnel structure and a tunnel construction method for a vertical jacking method. Background Art

[0002] With the development of the national economy, there are more and more intake and drainage tunnels. In order to minimize the pollution of seawater, tunnels are often built below the seabed. The tunnel and the seabed are connected by risers constructed by vertical jacking. There are openings on the tunnel segments, and the risers are jacked at the openings. During the vertical jacking process of the risers and after the jacking, seawater leakage may occur due to gaps between the segments and the jacking structure. The flanges and connecting bolts of the jacking structure are made of steel, which are easily corroded and lose their normal working performance when exposed to seawater environment, causing waste of resources and endangering the safety of the tunnel. The leakage of seawater will also affect the normal use of related pipelines in the main tunnel. Existing water-stopping structures are generally composed of two rubber rings, which often have problems such as poor adaptability to the soil layer and easy wear of the rubber rings, resulting in the water-stopping effect not meeting actual needs. Therefore, there is an urgent need for a water-stopping structure, tunnel structure and tunnel construction method for the vertical jacking method of submarine tunnels to prevent seawater leakage during and after the jacking process. Summary of the Invention

[0003] In order to solve the above problems, on the one hand, the present invention provides a water-stop structure for a vertical jacking method, including a water-stop frame arranged on the inner side of a tunnel segment and surrounding the segment opening, and also including a sealing ring, an oil-immersed packing unit and a grouting hole. A first stopper is provided on the inner wall of the water-stop frame, and a sealing area is formed between the first stopper, the water-stop frame and the riser mechanism. The sealing ring and the oil-immersed packing unit are respectively extruded and filled in the sealing area. The sealing ring is located above the oil-immersed packing unit, and the grouting hole is opened on the inner wall of the water-stop frame and is connected to the sealing area.

[0004] Furthermore, the slurry injected through the grouting holes fills the gaps in the sealing area.

[0005] Furthermore, the position of the first stopper on the water stop frame is adjustable and the adjustment direction is parallel to the vertical direction.

[0006] Furthermore, it also includes a flexible waterproof layer, which is arranged on the outside of the tunnel segment and blocks the gap between the tunnel segment and the riser mechanism.

[0007] Furthermore, the water stop frame is provided with a first mounting hole for bolting to the riser mechanism, and the first mounting hole is located below the first stop block. The tunnel pipe segment is provided with a second mounting hole for bolting to the riser mechanism, and the axial direction of the second mounting hole is parallel to the axial direction of the first mounting hole.

[0008] Furthermore, a reinforcing steel plate is provided at the bottom of the water stop frame, and the reinforcing steel plate is provided corresponding to the connection node between the water stop frame and the riser mechanism.

[0009] On the other hand, the present invention also provides a tunnel structure, including a tunnel segment and a riser mechanism, wherein the riser mechanism is connected to the segment opening of the tunnel segment, and the tunnel segment and the riser mechanism are connected via the water-stop structure as described above.

[0010] In another aspect, the present invention further provides a tunnel construction method, comprising the following steps:

[0011] Construct a water stop frame on the inner side of the tunnel segment and open grouting holes on the water stop frame;

[0012] A sealing ring, an oil-immersed packing unit, and a first stopper abutting against the oil-immersed packing unit are provided between the water stop frame and the riser mechanism;

[0013] Lift the riser mechanism through the lifting device;

[0014] After lifting into place, fix the riser mechanism to the water stop frame and tunnel segments.

[0015] Furthermore, during the jacking process, if leakage is detected between the tunnel segments and the riser mechanism, grout is injected through the grouting holes to plug the leak.

[0016] Furthermore, after the riser mechanism is lifted into place, the riser mechanism is connected to the water stop frame using a first bolt, and the riser mechanism is connected to the tunnel segment using a second bolt.

[0017] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0018] 1) The water-stopping structure, tunnel structure and tunnel construction method for vertical jacking method provided by the present invention have triple water-stopping measures including sealing rings, grouting holes and oil-immersed packings on the inner wall of the water-stopping frame, which have good waterproofing effect and can avoid seawater leakage during and after jacking; the grouting holes and the oil-immersed packings are arranged in combination, and the oil-immersed packings are not removed during the construction period, thereby avoiding the risk of leakage during the construction period. The oil-immersed packings are used for temporary water-stopping as well as for water-stopping during the operation period.

[0019] 2) The water-stop structure, tunnel structure and tunnel construction method for the vertical jacking method provided by the present invention are provided with a flexible waterproof layer at the outer connection nodes of the tunnel segments and the riser mechanism, which can prevent soil and water from leaking into the main tunnel during and after the jacking process, thereby improving the waterproof performance of the tunnel.

[0020] 3) The water-stop structure, tunnel structure and tunnel construction method for the vertical jacking method provided by the present invention, after being jacked into place, the riser mechanism is connected with double-track bolts, and the first bolt is connected to the water-stop frame through the first bolt hole to achieve a quick connection between the riser and the tunnel, and the jacking device can be quickly recovered to improve construction efficiency; the second bolt is connected to the tunnel segment through the second bolt hole, serving as the main connection of the tunnel, and through the double-track connection, the dual effects of rapid construction and improved connection strength are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 Schematic diagram of the water-stop structure for vertical jacking method provided by the present invention Figure 1 ;

[0023] Figure 2 A schematic diagram of a tunnel drainage riser in a water-stop structure for a vertical jacking method provided by the present invention;

[0024] Figure 3 Schematic diagram of the water-stop structure for vertical jacking method provided by the present invention Figure 2 ;

[0025] Figure 4 A schematic structural diagram of a tunnel segment and a water-stop frame in a water-stop structure for a vertical jacking method provided by the present invention;

[0026] Figure 5 This is a top view of the water-stop structure used in the vertical jacking method provided by the present invention.

[0027] 1-tunnel segment; 2-waterstop frame; 21-first mounting hole; 22-first bolt; 23-rib; 3-sealing ring; 4-oil-immersed packing unit; 5-grouting hole; 6-first block; 7-riser mechanism; 71-top riser segment; 72-middle riser segment; 73-bottom riser segment; 731-threaded hole; 732-grouting hole; 74-riser cover; 75-first flange; 76-second flange; 77-third flange; 78-waterstop rubber pad; 79-sealing layer; 8-adjusting pressure plate; 81-adjusting bolt; 9-flexible waterproof layer; 91-protective plate; 10-reinforcement steel plate; 11-second block; 12-support plate. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. In the accompanying drawings, the sizes and relative sizes of certain parts may be exaggerated for clarity.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connection" and "connected" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the description of the present invention, terms such as "up", "down", "left", "right", "front", and "back" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0031] Furthermore, in the description of the present invention, the terms "first" and "second" are used solely to distinguish between features in the description and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features being described. Furthermore, features designated as "first" or "second" may explicitly or implicitly include one or more of the features.

[0032] Example 1

[0033] As the instruction manual Figure 1 and 4As shown, the present invention provides a water-stop structure for a vertical jacking method, comprising a water-stop frame 2 arranged on the inner side of a tunnel segment 1 and surrounding the segment opening, and also comprising a sealing ring 3, an oil-immersed packing unit 4 and a grouting hole 5. A first stopper 6 is provided on the inner wall of the water-stop frame 2, and a sealing area is formed between the first stopper 6, the water-stop frame 2 and the riser mechanism 7. The sealing ring 3 and the oil-immersed packing unit 4 are respectively extruded and filled in the sealing area. The sealing ring 3 is located above the oil-immersed packing unit 4, and the grouting hole 5 is opened on the inner wall of the water-stop frame 2 and is connected to the sealing area.

[0034] Specifically, the tunnel segments 1 are preferably steel segments, and a plurality of steel segments are sequentially distributed along the annular direction to form a tunnel. A hole is opened on the steel segment at the top of the tunnel, and a riser mechanism 7 extends from the hole to the seabed surface. The riser mechanism 7 is connected to the tunnel, as shown in the attached manual. Figure 2 The following is a schematic diagram of the tunnel drainage riser. Figure 1 The figure shows a schematic diagram of the connection between the riser mechanism 7 and the steel pipe segment after the riser jacking is completed. The riser mechanism 7 includes a top riser segment 71, an intermediate riser segment 72 and a bottom riser segment 73. The top riser segment 71, the intermediate riser segment 72 and the bottom riser segment 73 are connected in sequence along the vertical direction. There are multiple intermediate riser segments 72, and the actual number is set according to demand. The intermediate riser segments 72 are connected in sequence along the vertical direction. After the jacking is completed, a riser cover 74 is provided on the top riser segment 71, and the bottom riser segment 73 is fixedly connected to the tunnel. The water-stop frame 2 is arranged on the inner side of the tunnel segment 1 and is arranged around the segment opening. After the riser is lifted into place, a sealing ring 3 and an oil-immersed packing unit 4 are provided between the inner wall of the water-stop frame 2 and the bottom riser segment 73 to fill the gap between the two, so that there is a good waterproof effect between the water-stop frame 2 and the bottom riser segment 73, preventing soil or seawater from seeping into the tunnel. Grouting holes 5 are also reserved on the water-stop frame. The grouting holes 5 are connected to the sealing area. When leakage is serious, double liquid slurry can be injected through the grouting holes 5 or polyurethane can be pressed in to stop the leakage.

[0035] Preferably, a plurality of grouting holes 5 are provided on the water stop frame 2, and 5 grouting holes 5 are reserved around the water stop frame 2. The aperture of the grouting hole 5 is preferably φ25. The grouting valve is connected during the jacking process. When the leakage is serious, the double liquid slurry can be injected through the grouting hole or polyurethane can be pressed in to stop the leakage; after the jacking is completed, the slurry can be injected through the grouting hole to fill the gap between the sealing ring and the oil-immersed packing in the sealing area, which can effectively improve the sealing and waterproofing effect.

[0036] Preferably, ribs 23 are connected to the water stop frame.

[0037] Preferably, as shown in the attached instructions Figure 3The figure shows the connection between the riser mechanism 7 and the steel segments before jacking. The tunnel segments include permanent tunnel segments and jacking tunnel segments. The jacking tunnel segments are the tunnel segments corresponding to the segment openings. The remaining tunnel segments are permanent tunnel segments, and the waterstop frames are connected to the permanent tunnel segments. A first flange 75 and a second flange 76 are sequentially positioned above the top riser segment 71. The first flange 75 is connected to the top riser segment 71 and is removably bolted to the second flange 76. A third flange 77 is positioned at the bottom of the jacking tunnel segment and is removably bolted to the second flange 76. This connection ensures a waterproof seal within the tunnel. A waterstop rubber gasket 78 is positioned between the second and third flanges 76, 77 to prevent seawater from entering the riser and tunnel through the flange connection in the event of failure of the rubber ring 3 and the oil-immersed packing unit 4, providing further waterproofing. A waterstop rubber gasket 78 is also positioned between the first and second flanges 75, 76.

[0038] Preferably, after the flanges are connected with fixed bolts, a sealing layer 79 is used to seal the flange cavity. The sealing layer 79 can be waterproof cement mortar, wooden pads, etc. In this embodiment, the first flange 75 is filled with waterproof cement mortar to prevent seawater from penetrating into the flange cavity. The second flange 76 is filled with wooden pads to prevent seawater from penetrating into the flange cavity. A sealing area is formed between the flange and the water stop frame 2, and the sealing ring 3 and the oil-immersed packing unit 4 are squeezed and filled between the water stop frame 2 and the flange. By means of sealing rings, oil-immersed packing, a water-stop rubber pad 78 between the flanges, and a sealing layer 79 on the flange, the waterproof performance of the riser mechanism 7 itself and between the riser mechanism 7 and the tunnel can be effectively improved during the jacking process.

[0039] In some embodiments, after the jacking is completed, the jacking tunnel segments and the second flange 76 are removed, and the riser cover 74 is connected to the first flange 75 .

[0040] In an optimized implementation method, the grouting hole 5 is arranged in the middle of the sealing area and corresponds to the position of the oil-immersed packing unit 4. Specifically, the sealing ring 3 is arranged on the upper part of the water stop frame 2, and the oil-immersed packing unit 4 is arranged below the sealing ring 3. The sealing ring 3 and the oil-immersed packing unit 4 are distributed in sequence along the vertical direction, which can extend the sealing path and improve the sealing and waterproofing effect.

[0041] In an optimized implementation method, the oil-immersed packing unit 4 includes a plurality of oil-immersed packings, each of which is distributed vertically in sequence. The bottom layer of oil-immersed packing abuts against the first stopper 6, and the first stopper 6 is provided on the water-stop frame 2 for limiting the oil-immersed packing and adjusting the position and tightness of the oil-immersed packing to achieve the best water-stopping effect.

[0042] Preferably, the sealing ring 3 and the oil-immersed packing are respectively arranged around the inner side of the water stop frame 2, and the first stop block 6 can be arranged along the inner side of the water stop frame 2. The first stop block 6 can use a pressure strip to limit the oil-immersed packing.

[0043] Specifically, the position of the first stop block 6 on the water stop frame 2 is adjustable and the adjustment direction is parallel to the vertical direction, that is, the position of the first stop block 6 can be adjusted to adjust the position and tightness of the oil-immersed packing to achieve the best water-stopping effect. The water stop frame 2 is connected to an adjusting pressure plate 8, and an adjusting bolt 81 is threadedly connected to the adjusting pressure plate 8. The front end of the adjusting bolt 81 abuts against the first stop block 6. By adjusting the first stop block 6 with the adjusting bolt 81, the position and tightness of the oil-immersed packing can be adjusted to achieve the best water-stopping effect. The water stop frame 2 is provided with a plurality of adjusting pressure plates 8, each of which is arranged at intervals along the axial direction of the water stop frame 2, and each of the adjusting pressure plates 8 is provided with at least one adjusting bolt 81. After the vertical pipe jacking is completed, the adjusting pressure plate 8 and the adjusting bolt 81 are removed, and the first stop block 6, the oil-immersed packing and the sealing ring 3 are retained.

[0044] Optimize the implementation method, as shown in the attached instructions Figure 5 As shown, the system also includes a flexible waterproof layer 9, which is positioned outside the tunnel segments 1 and blocks the gap between the segments 1 and the riser mechanism 7. Specifically, the flexible waterproof layer 9 is preferably a rubber sheet, which is flexible and bendable. The rubber sheet covers the joint between the permanent tunnel segments and the jacking risers to prevent soil and water from leaking into the main tunnel during the jacking process. The rubber sheet is partially bonded to the permanent tunnel segments and partially attached to the riser segments.

[0045] Preferably, in order to prevent the rubber plate from being lifted up when the shield tail brush is working, a protective plate 91 is fixed to the permanent tunnel segment by rivets. The protective plate 91 is preferably a soft protective iron sheet. The protective plate 91 is crimped onto the flexible waterproof layer 9, and the flexible waterproof layer 9 is further fixed to the permanent tunnel segment. The protective plate 91 is arranged above the working direction of the shield.

[0046] Optimize the implementation method, as shown in the attached instructions Figure 1As shown, the water stop frame 2 is provided with a first mounting hole 21 for bolting to the riser mechanism. The first mounting hole 21 is located below the first stopper 6. The tunnel segment 1 is provided with a second mounting hole for bolting to the riser mechanism. The axial direction of the second mounting hole is parallel to the axial direction of the first mounting hole 21. Specifically, the first mounting hole 21 is provided on the connecting beam of the water stop frame. The bottom riser segment 73 is provided with a third mounting hole corresponding to the first mounting hole 21. The third mounting hole and the first mounting hole 21 are connected by a first bolt 22. The permanent tunnel segment is provided with a second mounting hole on the side adjacent to the riser segment. The bottom riser segment 73 is provided with a threaded hole 731 corresponding to the second mounting hole. The threaded hole 731 and the second mounting hole are fixedly connected by a second bolt. The threaded hole 731 is provided in the middle of the permanent tunnel segment. The riser and tunnel are connected using double bolts. After jacking is completed, the riser segment can be fixed to the tunnel to achieve a seal between the riser and the tunnel. Specifically, the double-track bolt connection is that the first bottom riser segment 73 is connected to the connecting beam of the water stop frame 2, which is used to realize the rapid connection between the riser mechanism and the tunnel after the jacking pipe is lifted into place during the construction period. The jacking device can be quickly recovered to improve construction efficiency; the second bottom riser segment 73 is connected to the permanent tunnel segment, which is implemented after grouting reinforcement outside the tunnel. It serves as the main connection of the pipe-tunnel connection. Through the double-track connection, it can achieve the dual effects of rapid construction and improved connection strength.

[0047] In an optimized implementation, a reinforcing steel plate 10 is installed at the bottom of the waterstop frame 2. This plate corresponds to the connection point between the waterstop frame 2 and the riser mechanism. Specifically, after jacking is completed, the bottom riser segment 73 is connected to the waterstop frame 2 via the first bolts 22. The adjusting pressure plate 8 is removed, and the reinforcing steel plate 10 is installed at the bottom of the waterstop frame 2. One end of the reinforcing steel plate 10 is connected to the waterstop frame 2, and the other end is connected to the bottom riser segment 73, thereby enhancing the reliability of the pipe tunnel connection.

[0048] Preferably, the reinforcing steel plate 10 and the water stop frame 2 can be welded, and the reinforcing steel plate 10 and the bottom riser piece 73 can be welded.

[0049] Specifically, a groove is provided at the bottom of the bottom riser 73, with the first and third mounting holes corresponding thereto. A support plate 12 is provided within the groove, and the first stopper 6 is supported on the support plate. Gaskets are provided between the support plate, the water-stop frame 2, and the bottom riser 73, respectively, to enhance connection stability and further enhance waterproofing.

[0050] The optimized embodiment further includes a second stopper 11, which is abutted between the sealing ring 3 and the oil-immersed packing unit 4 and is used to limit the sealing ring 3. The second stopper 11 is preferably a press strip.

[0051] Preferably, a grouting hole 732 is further provided on the bottom riser segment 73, and the grouting hole 732 is arranged below the threaded hole 731. The grouting hole 732 is connected to the gap between the permanent tunnel segment and the bottom riser segment 73. After the jacking is completed, grouting is performed through the grouting hole 732 to achieve sealing between the permanent tunnel segment and the bottom riser segment 73, thereby achieving further sealing and waterproofing of the tunnel. The grouting hole 732, the sealing ring 3, the oil-immersed packing and the grouting hole 5 achieve multiple sealing and waterproofing of the tunnel.

[0052] In this application, the joints between the steel pipe segments and the jacking risers are covered with a flexible waterproof layer 9 to prevent soil and water from leaking into the main tunnel during the jacking process; the flexible waterproof layer 9 is connected to the steel pipe segments by bonding; the flexible waterproof layer 9 is fixed with a protective plate 91 above the working direction of the shield to prevent the flexible waterproof layer 9 from being lifted up when the shield tail brush is working, causing soil and water leakage; the protective plate 91 is fixed to the steel pipe segments by rivets; a sealing ring 3, a grouting hole 5 and an oil-immersed packing are arranged above the inner wall of the water-stop frame. The grouting hole and the oil-immersed packing are combined and the oil-immersed packing is not removed during the construction period to avoid the risk of leakage during the construction period. It is used for temporary water stopping as well as for water stopping during the operation period.

[0053] Example 2

[0054] The present invention also provides a tunnel structure, including a tunnel segment 1 and a riser mechanism 7, wherein the riser mechanism 7 is connected to the segment opening of the tunnel segment 1, and the tunnel segment 1 and the riser mechanism 7 are connected by the water-stop structure described in Example 1, which will not be repeated here.

[0055] Example 3

[0056] The present invention also provides a tunnel construction method, comprising the following steps:

[0057] S1: constructing a water stop frame 2 on the inner side of the tunnel segment 1 and opening grouting holes 5 on the water stop frame 2.

[0058] Specifically, the position of the segment opening is determined. The tunnel segment corresponding to the segment opening is the jacking tunnel segment, and the remaining tunnel segments are permanent tunnel segments. A water stop frame 2 is set on the permanent tunnel segment. The water stop frame 2 is set around the segment opening, and multiple grouting holes 5 are opened in sequence along the circumference of the water stop frame 2.

[0059] S2: A sealing ring 3, an oil-immersed packing unit 4 and a first stopper 6 are provided between the water-stop frame 2 and the riser mechanism 7. The first stopper 6 abuts against the oil-immersed packing of the lowest layer.

[0060] S3: Lift the riser mechanism through the lifting device.

[0061] S4: After being lifted into place, the riser mechanism is fixed to the water stop frame 2 and the tunnel segment 1.

[0062] Optimize the implementation method. During the riser jacking process and after the jacking is completed, it is necessary to ensure waterproofing between the tunnel and the riser mechanism. During the operation of the vertical jacking method, due to the gap between the pipe joint and the flange seat, seawater leakage may occur. The flange and connecting bolts are made of steel, which are easily corroded and lose their normal working performance when exposed to the seawater environment, causing waste of resources and endangering the safety of the tunnel. The riser mechanism 7 includes a top riser segment 71, an intermediate riser segment 72 and a bottom riser segment 73. The top riser segment 71, the intermediate riser segment 72 and the bottom riser segment 73 are connected in sequence along the vertical direction. There are multiple intermediate riser segments 72, and the actual number is set according to demand. Each intermediate riser segment 72 is connected in sequence along the vertical direction. After the jacking is completed, the top riser segment 71 is provided with a riser cover 74, and the bottom riser segment 73 is fixedly connected to the tunnel.

[0063] As the instruction manual Figure 3 As shown, it is a structural diagram of the tunnel and riser mechanism. Step S2 specifically comprises: setting a sealing ring 3, an oil-immersed packing unit 4 and a first stopper 6 on the inner wall of the water-stop frame 2, connecting the second flange 76 to the third flange 77 of the jacking tunnel segment by bolts, and connecting the first flange 75 to the second flange 76 by bolts. The sealing ring 3 and the oil-immersed packing unit 4 are squeezed and filled between the water-stop frame 2 and the flange to form a sealed waterstop.

[0064] Preferably, after the construction of the sealing ring 3 is completed, a second stopper 11 is provided below the sealing ring 3 , and the second stopper 11 abuts against the sealing ring 3 to limit the sealing ring 3 .

[0065] In an optimized embodiment, step S2 further includes providing a water-stopping rubber gasket 78 between the second flange 76 and the third flange 77 to prevent seawater from entering the riser and tunnel through the flange connection in the event of failure of the rubber ring 3 and the oil-immersed packing unit 4, thereby further providing waterproofing. A water-stopping rubber gasket 78 is also provided between the first flange 75 and the second flange 76.

[0066] In an optimized implementation method, step S2 further includes, after the flange is installed, sealing the flange cavity with a sealing layer 79. Specifically, the first flange 75 is filled with waterproof cement mortar, and the second flange 76 is filled with wooden pads to prevent seawater from seeping into the flange cavity.

[0067] The optimized implementation method, step S2 also includes, after completing the construction of the sealing ring 3, the oil-immersed packing unit 4, the first stopper 6 and the flange, setting an adjusting pressure plate 8 at the bottom of the water-stop frame, and opening a threaded hole on the adjusting pressure plate 8, and an adjusting bolt 81 is threadedly connected to the threaded hole, and the front end of the adjusting bolt 81 abuts against the first stopper 6. By adjusting the first stopper 6 by adjusting the adjusting bolt 81, the position and tightness of the oil-immersed packing can be adjusted to achieve the best water-stopping effect.

[0068] In an optimized implementation, prior to construction in step S2, a flexible waterproof layer 9 is constructed on the exterior of the tunnel segment 1, specifically at the junction between the permanent tunnel segment and the jacking tunnel segment. During the jacking process, the flexible waterproof layer 9 seals the gap between the tunnel segment 1 and the riser mechanism 7. A protective plate 91, preferably made of soft protective iron sheet, is fixed to the permanent tunnel segment via rivets. This plate is crimped onto the flexible waterproof layer 9, further securing it to the permanent tunnel segment. The protective plate 91 is positioned above the shield working direction.

[0069] Specifically, the flexible waterproof layer 9 is preferably a rubber sheet that is flexible and can be bent or curved. The rubber sheet covers the joints between the permanent tunnel segments and the jacking risers to prevent soil and water from leaking into the main tunnel during the jacking process. The rubber sheet is partially bonded to the permanent tunnel segments and partially attached to the riser segments.

[0070] In an optimized implementation mode, step S3 specifically includes:

[0071] S31. A top riser segment 71 is arranged below the first flange, and the top riser segment 71 is supported on a jacking device;

[0072] S32, start the jacking device to jack up the top riser segment 71. After the jacked riser segment 71 rises to the set position, the jacking device stops and resets. The middle riser segment 72 is placed on the jacking device and the above operation is repeated until the jacking of the bottom riser segment 73 is completed.

[0073] During the jacking process, leakage is monitored. If leakage is detected, the grouting valve connected to the grouting hole is opened, and slurry is injected into the sealing area through the grouting hole to plug the leak. The slurry fills the sealing area and the gap between the sealing ring and the oil-immersed packing, further sealing the sealing area. The slurry is a double-liquid slurry or polyurethane. During the jacking process, the slurry will not solidify in the sealing area, avoiding any impact on the jacking operation.

[0074] The optimized implementation method, specifically step S4 is: after completing the jacking of the bottom riser segment 73, the bottom riser segment 73 is fixedly connected to the connecting beam of the water stop frame 2 by a first bolt, so as to realize the rapid connection between the riser and the tunnel after the jacking pipe is lifted into place during the construction period. The jacking device can be quickly recovered to improve the construction efficiency; the bottom riser segment 73 is fixedly connected to the permanent tunnel segment by a second bolt as the main connection of the pipe-tunnel connection; through the double-channel connection, the dual effects of rapid construction and improved connection strength are achieved.

[0075] Preferably, grouting reinforcement outside the hole is completed before installing the second bolt.

[0076] Those skilled in the art will appreciate that the present invention can be implemented in many other specific forms without departing from the spirit and scope of the present invention. Although embodiments of the present invention have been described, it should be understood that the present invention should not be limited to these embodiments, and those skilled in the art can make changes and modifications within the spirit and scope of the present invention as defined by the appended claims.

Claims

1. A water-stop structure for vertical jacking method, comprising a water-stop frame arranged on the inner side of a tunnel segment and surrounding the segment opening, characterized in that: It also includes a sealing ring, an oil-immersed packing unit and a grouting hole. A first stopper is provided on the inner wall of the water stop frame. A sealing area is formed between the first stopper, the water stop frame and the riser mechanism. The sealing ring and the oil-immersed packing unit are respectively squeezed and filled in the sealing area. The sealing ring is located above the oil-immersed packing unit. The grouting hole is opened on the inner wall of the water stop frame and is connected to the sealing area.

2. The water-stop structure for vertical jacking method according to claim 1, characterized in that: The slurry injected into the grouting holes fills the gaps in the sealing area.

3. The water-stop structure for vertical jacking method according to claim 1, characterized in that: The position of the first stop block on the water stop frame is adjustable and the adjustment direction is parallel to the vertical direction.

4. The water-stop structure for vertical jacking method according to claim 1, characterized in that: It also includes a flexible waterproof layer, which is arranged on the outside of the tunnel segment and blocks the gap between the tunnel segment and the riser mechanism.

5. The water-stop structure for vertical jacking method according to claim 1, characterized in that: The water stop frame is provided with a first mounting hole for bolt connection with the riser mechanism, and the first mounting hole is located below the first stop block. The tunnel pipe segment is provided with a second mounting hole for bolt connection with the riser mechanism, and the axial direction of the second mounting hole is parallel to the axial direction of the first mounting hole.

6. The water-stop structure for vertical jacking method according to claim 1, characterized in that: A reinforcing steel plate is provided at the bottom of the water stop frame, and the reinforcing steel plate is provided corresponding to the connection node between the water stop frame and the riser mechanism.

7. A tunnel structure comprising a tunnel segment and a riser mechanism, wherein the riser mechanism is connected to a segment opening of the tunnel segment, characterized in that: The tunnel segments and the riser mechanism are connected via the water-stop structure according to any one of claims 1 to 6.

8. A tunnel construction method, characterized in that: The following steps are involved: Construct a water stop frame on the inner side of the tunnel segment and open grouting holes on the water stop frame; A sealing ring, an oil-immersed packing unit, and a first stopper abutting against the oil-immersed packing unit are provided between the water stop frame and the riser mechanism; Lift the riser mechanism through the lifting device; After lifting into place, fix the riser mechanism to the water stop frame and tunnel segments.

9. The tunnel construction method according to claim 8, characterized in that: During the jacking process, if leakage is detected between the tunnel segments and the riser mechanism, slurry is injected through the grouting holes to stop the leakage.

10. The tunnel construction method according to claim 8, characterized in that: After the riser mechanism is lifted into position, the riser mechanism is connected to the water stop frame by using a first bolt, and the riser mechanism is connected to the tunnel segment by using a second bolt.

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