Shield starting tunnel portal sealing construction device suitable for water-rich environment and construction method of shield starting tunnel portal sealing construction device
By using horizontal freezing reinforcement and small steel box-initiated shield construction methods in water-rich environments, a multi-layer sealing structure is formed, which solves the problems of water leakage and sand leakage in shield construction, ensuring construction safety and surrounding environment stability.
Patent Information
- Application Number
- CN202510760224.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-09
- Publication Date
- 2025-07-25
AI Technical Summary
In the water-rich silt sand formation, problems such as water leakage and sand leakage in the initial tunnel door are often encountered during the initial construction of the shield structure. The reinforcement methods of the existing technology are of limited effect. Traditional sealing devices are not sealed in high-pressure and water-rich environments, which pose safety hazards.
The horizontal freezing reinforcement technology is used to form a 'cup-shaped' freezing wall, and a special hole door brush is welded in the steel ring of the hole door, and a three-chamber small steel box sealing device is installed, including three-layer water stop curtains and flip plates. After the shield tail is entered into the hole, the arc plate is welded and the inert slurry is filled with closed hole doors. Combined with the shield construction method of the small steel box, the sealing effect is ensured.
Effectively control the risk of water and sand leakage during the origin of the shield structure, ensure construction safety, reduce the settlement and displacement of surrounding soil, ensure the safety of buildings around the station, and avoid dangers.
Smart Images
Figure CN120367593A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of underground engineering construction, specifically to a construction device and construction method for the seal of the shield starting portal applicable to a water-rich environment. Background Technique
[0002] In the fields of urban subway construction, tunnel engineering, etc., shield tunneling construction is widely used due to its advantages such as high efficiency and safety. Shield starting is a key link in shield construction, and portal sealing is an important technical measure to ensure the safe and smooth progress of shield starting.
[0003] When carrying out shield starting construction in a water-rich silty sand stratum, conventional methods are prone to problems such as water leakage and sand leakage at the starting portal, seriously affecting construction safety and progress. In the prior art, generally, ground improvement methods such as cement-soil mixing piles or high-pressure jet grouting piles are used, but these methods have limited reinforcement effects in a water-rich silty sand stratum and are difficult to completely block groundwater seepage. In addition, traditional portal sealing devices are mostly single-layer curtain structures, and their sealing effects are not good in a high-pressure water-rich environment, posing great safety hazards. Therefore, it is necessary to invent a construction device and construction method for the seal of the shield starting portal applicable to a water-rich environment to solve the above problems. Summary of the Invention
[0004] The present invention provides the following technical solutions: A construction method for the seal of the shield starting portal applicable to a water-rich environment, including the following steps: S1. Horizontal freezing reinforcement of the heading face Arrange horizontal freezing holes in the shield starting portal area to form a "cup-shaped" frozen wall. The frozen wall includes a cup bottom and a cup wall. The thickness of the cup bottom is 4.0 m, the thickness of the cup wall is 2.0 m, and the length of the cup wall is 7.5 m.
[0005] S2. Installation of the portal sealing device Weld a special portal brush inside the portal steel ring and install a three-layer two-chamber small steel box sealing device. The small steel box includes three layers of water-stop curtain cloth, a flap, and a special portal brush.
[0006] S3. Demolition of the portal Demolish the portal retaining structure in stages. First, chisel off the concrete protective layer on the outside of the diaphragm wall and cut off the backfill soil-side steel bars, and then demolish the portal concrete from top to bottom in blocks.
[0007] S4. Shield starting After the shield machine passes through the frozen reinforcement area, pull out the inner and middle circle freezing holes, continue to freeze the outer circle freezing holes, and cut and seal the holes after the shield machine completely passes through.
[0008] S5. Sealing of the portal After the shield tail of the shield machine enters the tunnel, weld an arc-shaped plate outside the steel box, fill the cavity gap with inert slurry for sealing, and promptly seal the portal.
[0009] Preferably, in the step S1, the end freezing reinforcement construction specifically includes the following steps: S101. Borehole positioning: According to the design, 57 horizontal freezing holes are arranged, including 32 holes on the outer ring cup wall, and accurately positioned using a total station.
[0010] S102. Borehole construction: Use an MD-120A drill rig with a diamond bit for drilling, and control the borehole deviation within ≤150 mm.
[0011] S103. Freezing pipe installation: Lower a Φ89×8 low-carbon seamless steel pipe freezing pipe, and install the supply pipe, horn, and end cap.
[0012] S104. Freezing system commissioning: Connect the brine pipeline and install temperature and pressure monitoring devices.
[0013] S105. Active freezing: Maintain the brine temperature at -28°C to -30°C, and continuously monitor the development of the frozen wall.
[0014] S106. Freezing effect detection: Detect through temperature measurement holes and exploration holes to confirm that the frozen wall has joined and the strength meets the standard.
[0015] Preferably, in the step S103, the freezing pipe installation further includes: S1031. Orifice pipe installation: Use a Ф133×5 mm seamless steel pipe and install a DN125 gate valve.
[0016] S1032. Sealing treatment: Seal the gap between the freezing pipe and the orifice pipe with a leak-proof material.
[0017] S1033. The test pressure for leakage is 0.8 to 1.0 MPa, and it is qualified after stabilizing the pressure for 30 minutes.
[0018] S1034. Use the theodolite light survey method to correct the borehole deviation in real time.
[0019] Preferably, in the step S2, the installation of the hole sealing device further includes the following steps: S201. Steel box positioning and welding: Accurately position and weld the small steel box on the portal steel ring.
[0020] S202. Installation of the curtain rubber plate: Install three curtain rubber plates in sequence to ensure the sealing performance.
[0021] S203. Installation of the flap: Install two adjustable flap devices.
[0022] S204. Sealing test: Conduct a 0.3 MPa water pressure test and keep the pressure for 30 minutes without leakage.
[0023] Preferably, in step S2, the small steel box is in close contact with the first water stop curtain board of the portal and the station. The gaps are sealed with water-swellable sealant. The water stop curtain rubber board and the portal brush form three water stop lines of defense. After the shield tail of the shield machine enters the hole, an arc-shaped plate is welded outside the steel box, and the arc-shaped plate and the segment are reinforced with expansion bolts.
[0024] Preferably, in step S3, the construction of breaking the portal also includes the following steps: S301. First breaking: Chisel off the concrete protective layer within the portal contour line and cut off the reinforcing bars on the backfill side.
[0025] S302. Second breaking: Chisel off the main body concrete in blocks, leaving a protective layer about 200 mm thick.
[0026] S303. Final breaking: Break the remaining protective layer before the shield starts, and quickly clean up the muck.
[0027] Preferably, in step S3, the breaking range of the portal is the diaphragm wall retaining structure within the reserved portal contour line with a diameter of 7100 mm. It is chiseled off from top to bottom in zones by manual high-pressure pneumatic picks. The breaking sequence is: first chisel off the concrete protective layer on the outside of the diaphragm wall and cut off the reinforcing bars on the backfill side, then break the portal concrete from top to bottom in blocks, and finally clean up the waste residue and quickly assemble the negative ring segments to reduce the exposure time of the working face.
[0028] Preferably, in step S4, the shield starting also includes the following steps: S401. Negative ring assembly: Assemble 8 rings of 1.5 m wide negative ring segments.
[0029] S402. After the cutter head touches the working face, start with a low thrust of ≤8000 kN and a low rotation speed of ≤1 rpm.
[0030] S403. Synchronous grouting: Immediately carry out synchronous grouting after the shield tail passes through the sealing device.
[0031] S404. Parameter adjustment: Dynamically adjust the tunneling parameters according to the monitoring data.
[0032] Preferably, in step S4, the starting tunneling length is 67 rings, which are divided into a reinforcement area (0 - 8 rings) and a non-reinforcement area (9 - 67 rings). The installation position of the reaction frame is 12.25 m away from the portal. The starting tunneling parameters of the shield machine adopt the earth pressure balance mode, and synchronous grouting starts from the positive 4th ring.
[0033] Preferably, in step S5, the settlement compensation grouting utilizes the reserved grouting holes on the shield tunnel segments. The grouting range is the first 4 rings starting from the portal. The grouting material is mainly single-component cement slurry and supplemented by cement-sodium silicate double-component slurry. The grouting sequence is from bottom to top, following the principle of multiple times, small amount and uniformity.
[0034] A shield starting portal sealing construction device applicable to a water-rich environment, including a portal steel ring, a portal brush is arranged inside the portal steel ring, an inner plate is arranged outside the portal steel ring, a ring panel is arranged outside the inner plate, an inner plate is arranged outside the ring panel, a reinforcing plate is arranged between the inner plate and the ring panel, steel bars are welded outside the reinforcing plate, a curtain rubber plate is arranged outside the inner plate and the outer plate, a circular ring plate is arranged outside the curtain rubber plate, a flap is arranged outside the circular ring plate, bolts are arranged between the reinforcing plate, the curtain rubber plate, the circular ring plate and the flap, and grouting holes are formed in the ring panel.
[0035] Compared with the prior art, the present invention provides a shield starting portal sealing construction device applicable to a water-rich environment and its construction method, having the following beneficial effects: The shield starting portal sealing construction device applicable to a water-rich environment and its construction method are based on the application of the horizontal freezing reinforcement and the small steel box starting shield construction method in a water-rich environment. A small steel box is added to the starting portal sealing device on the basis of the horizontal freezing process. Three-layer two-chamber small steel boxes are used for both the left and right lines. The water stop device is a three-layer curtain, and the water stop curtain rubber plate and a special portal brush are used for water stop during starting. After the shield tail enters the tunnel, an arc-shaped plate is welded outside the steel box. After the shield tail enters, the cavity gap is filled and sealed with inert slurry in a timely manner, and the portal is sealed in a timely manner to ensure the safe and smooth starting of the shield.
[0036] The shield starting portal sealing construction device applicable to a water-rich environment and its construction method can effectively control the risks of water leakage and sand leakage during the starting of the shield in a water-rich environment, ensure the safe operation of the buildings and structures around the station, reduce the settlement and displacement of the surrounding soil, and guarantee the life and property safety of the personnel in the surrounding buildings and structures.
[0037] The shield starting portal sealing construction device applicable to a water-rich environment and its construction method can effectively control the risks of water leakage, sand leakage and collapse that may occur in the face of the tunnel during the horizontal freezing reinforcement and the small steel box starting shield construction, meet the safety requirements of the shield starting portal chiseling construction, provide a safe operation environment for the on-site construction by freezing and reinforcing the stratum, and avoid the occurrence of dangerous situations. BRIEF DESCRIPTION OF THE DRAWINGS
[0038] Figure 1 It is a schematic flow structure diagram of the present invention; Figure 2 It is a schematic diagram of the orifice pipe and the orifice device of the present invention; Figure 3 It is a structural diagram of the portal sealing device and the portal brush of the present invention; Figure 4 It is a schematic diagram of the structure of the starting portal breaking of the present invention; Figure 5 It is the starting sequence of the present invention Figure 1 ; Figure 6 For the starting step sequence of the present invention Figure 2 ; Figure 7 For the starting step sequence of the present invention Figure 3 ; Figure 8 It is the sectional view of the ground reinforcement at the starting end of the shield tunneling of the present invention; Figure 9 It is the elevation view of the arrangement of freezing holes at the starting end of the shield tunneling of the present invention; Figure 10 It is the sectional view of the arrangement of freezing holes at the starting end of the shield tunneling of the present invention; Figure 11 It is the rear schematic view after the installation of the portal steel box of the present invention; Figure 12 It is the sectional view of the processing and installation of the portal steel box of the present invention; Figure 13 It is the front schematic view before the installation of the portal steel box of the present invention; Figure 14 It is the schematic view of the circular plate of the small steel box at the portal of the present invention.
[0039] In the figure: 1. Portal steel ring; 2. Portal brush; 3. Inner plate; 4. Ring panel; 5. Outer plate; 6. Rib plate; 7. Steel bar; 8. Curtain rubber plate; 9. Circular plate; 10. Flap; 11. Bolt; 12. Grouting hole. Detailed implementation manners
[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment
[0041] Please refer to Figures 1-10 , the present invention provides a technical solution: a construction method for the seal of the portal of shield tunneling applicable to the water-rich environment, including the following steps: S1. Horizontal freezing reinforcement at the end Horizontal freezing holes are arranged in the portal area of the shield tunneling to form a "cup-shaped" frozen wall. The frozen wall includes a cup bottom and a cup wall. The thickness of the cup bottom is 4.0 m, the thickness of the cup wall is 2.0 m, and the length of the cup wall is 7.5 m.
[0042] The specific construction of the end freezing reinforcement includes the following steps: S101. Drilling positioning: According to the design, 57 horizontal freezing holes are arranged, including 32 holes in the outer cup wall, and accurate positioning is carried out using a total station.
[0043] S102, Drilling construction: Use an MD-120A drill rig with a diamond bit for drilling, and control the drilling deviation within ≤150 mm.
[0044] S103, Installation of freezing pipes: Lower a Φ89×8 low-carbon seamless steel freezing pipe, and install the liquid supply pipe, horn and end cover.
[0045] S104, Commissioning of the freezing system: Connect the brine pipeline and install temperature and pressure monitoring devices.
[0046] S105, Active freezing: Maintain the brine temperature at -28°C to -30°C and continuously monitor the development of the frozen wall.
[0047] S106, Detection of freezing effect: Detect through temperature measurement holes and exploration holes to confirm that the frozen walls intersect and the strength meets the standards.
[0048] In step S103, the installation of the freezing pipes further includes: S1031, Installation of the orifice pipe: Use a Ф133×5 mm seamless steel pipe and install a DN125 gate valve.
[0049] S1032, Sealing treatment: Seal the gap between the freezing pipe and the orifice pipe with leak-proof materials.
[0050] S1033, The test pressure for leakage is 0.8 - 1.0 MPa, and it is qualified after maintaining the pressure for 30 minutes.
[0051] S1034, Use the theodolite light survey method to correct the drilling deviation in real time.
[0052] S2, Installation of the opening sealing device Weld a special opening brush inside the opening steel ring, and install a three-channel two-chamber small steel box sealing device. The small steel box includes three layers of water-stop curtain cloth, flap and special opening brush.
[0053] The installation of the opening sealing device further includes the following steps: S201, Positioning and welding of the steel box: Accurately position and weld the small steel box on the opening steel ring.
[0054] S202, Installation of the curtain cloth rubber sheet: Install three layers of curtain cloth rubber sheets in sequence to ensure the sealing performance.
[0055] S203, Installation of the flap: Install two adjustable flap devices.
[0056] S204, Sealing test: Conduct a 0.3 MPa water pressure test and maintain the pressure for 30 minutes without leakage.
[0057] The small steel box is in close contact with the first water stop curtain board of the portal and the station. The gaps are sealed with water swelling sealant. The water stop curtain rubber board and the portal brush form three water stop lines of defense. After the shield tail of the shield machine enters the hole, an arc-shaped plate is welded on the outside of the steel box, and the arc-shaped plate and the segment are reinforced with expansion bolts.
[0058] S3. Demolition of the portal The portal retaining structure is demolished in stages. First, the concrete protective layer on the outside of the diaphragm wall is chiseled off and the backfill soil-side steel bars are cut off, and then the portal concrete is demolished from top to bottom in blocks.
[0059] The construction of portal demolition also includes the following steps: S301. First demolition: Chisel off the concrete protective layer within the portal contour line and cut off the backfill soil-side steel bars.
[0060] S302. Second demolition: Chisel off the main body concrete in blocks, leaving a protective layer about 200 mm thick.
[0061] S303. Final demolition: Demolish the remaining protective layer before the shield starts, and quickly clean up the muck.
[0062] The scope of portal demolition is the diaphragm wall retaining structure within the reserved portal contour line with a diameter of 7100 mm. It is chiseled off from top to bottom in zones using a manual high-pressure pneumatic pick. The demolition sequence is: first chisel off the concrete protective layer on the outside of the diaphragm wall, cut off the backfill soil-side steel bars, then demolish the portal concrete from top to bottom in blocks, and finally clean up the waste residue and quickly assemble the negative ring segments to reduce the exposure time of the face.
[0063] S4. Shield starting After the shield machine passes through the frozen reinforcement area, the inner and middle ring freezing holes are pulled out, and the outer ring freezing holes continue to be frozen. After the shield machine completely passes through, the holes are cut and sealed.
[0064] The shield starting also includes the following steps: S401. Negative ring assembly: Assemble 8 rings of 1.5 m wide negative ring segments.
[0065] S402. After the cutter head contacts the face, start with a low thrust of ≤8000 kN and a low rotation speed of ≤1 rpm.
[0066] S403. Synchronous grouting: Immediately carry out synchronous grouting after the shield tail passes through the sealing device.
[0067] S404. Parameter adjustment: Dynamically adjust the tunneling parameters according to the monitoring data.
[0068] The initial tunneling length is 67 rings, divided into a reinforcement area (0 - 8 rings) and a non-reinforcement area (9 - 67 rings). The installation position of the reaction frame is 12.25 m away from the portal. The initial tunneling parameters of the shield machine adopt the earth pressure balance mode, and synchronous grouting starts from the positive 4th ring.
[0069] S5. Sealing of the tunnel opening After the shield tail of the shield machine enters the tunnel, an arc-shaped plate is welded outside the steel box, and the cavity gap is filled with inert slurry for sealing, and the tunnel opening is sealed in a timely manner.
[0070] For the compensation grouting for thaw settlement, the reserved grouting holes on the segments of the shield tunnel are utilized. The grouting range starts from 4 rings at the tunnel opening. The main grouting material is single-component cement slurry, and the auxiliary material is the two-component cement-sodium silicate slurry. The grouting sequence is from the lower part to the upper part, following the principle of multiple times with small amounts and uniformity. Embodiment
[0071] Please refer to Figures 11-14 , and in combination with Embodiment 1, it is further obtained that a shield starting tunnel opening sealing construction device suitable for the shield starting tunnel opening sealing construction method in a rich water environment includes a tunnel opening steel ring. A tunnel opening brush is arranged inside the tunnel opening steel ring. An inner side plate is arranged outside the tunnel opening steel ring. A ring panel is arranged outside the inner side plate. An inner side plate is arranged outside the ring panel. A support plate is arranged between the inner side plate and the ring panel. Reinforcing bars are welded outside the support plate. A curtain rubber plate is arranged outside the inner side plate and the outer side plate. A circular ring plate is arranged outside the curtain rubber plate. A flap is arranged outside the circular ring plate. Bolts are arranged between the support plate, the curtain rubber plate, the circular ring plate and the flap. Grouting holes are formed on the ring panel.
[0072] The shield starting tunnel opening sealing construction device and its construction method suitable for the rich water environment are based on the application of the horizontal freezing reinforcement and the shield construction method with a small steel box in the rich water environment. The small steel box is added to the horizontal freezing process for the shield starting tunnel opening sealing device. The three-chamber and two-cavity small steel boxes are adopted for both the left and right lines. The water stop device is a three-layer curtain, and the water stop curtain rubber plate and a special tunnel opening brush are used for water stop during starting. After the shield tail of the shield machine enters the tunnel, an arc-shaped plate is welded outside the steel box. After the shield tail enters, the cavity gap is filled with inert slurry for sealing in a timely manner, and the tunnel opening is sealed in a timely manner, ensuring the safe and smooth starting of the shield, effectively controlling the risks of water leakage and sand leakage during the starting of the shield in the rich water environment, ensuring the safe operation of the buildings and structures around the station, reducing the settlement and displacement of the surrounding soil mass, protecting the life and property safety of the personnel in the surrounding buildings and structures. The horizontal freezing reinforcement and the shield construction method with a small steel box effectively control the risks of water leakage, sand leakage and collapse that may occur at the working face, meet the safety requirements for the removal construction of the shield starting tunnel opening, provide a safe working environment for the on-site construction by freezing and reinforcing the formation, and avoid the occurrence of dangerous situations.
[0073] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. Construction method for sealing the starting portal of a shield tunneling machine applicable to a water-rich environment, characterized in that, It includes the following steps: S1. Horizontal freezing reinforcement at the end Horizontal freezing holes are arranged in the shield starting portal area to form a "cup-shaped" freezing wall. The freezing wall includes a cup bottom and cup walls. The thickness of the cup bottom is 4.0 m, the thickness of the cup walls is 2.0 m, and the length of the cup walls is 7.5 m; S2. Installation of the portal sealing device Special portal brushes are welded inside the portal steel ring, and three two-chamber small steel box sealing devices are installed. The small steel box includes three layers of water-stop curtain cloth, flap plates and special portal brushes; S3. Breaking of the portal The portal retaining structure is broken in stages. First, the concrete protective layer on the outside of the diaphragm wall is chiseled off and the backfill-side steel bars are cut off, and then the portal concrete is broken from top to bottom in blocks; S4. Shield starting After the shield machine passes through the frozen reinforcement area, the inner and middle ring freezing holes are pulled out, and the outer ring freezing holes continue to be frozen. After the shield machine completely passes through, the holes are cut and sealed; S5. Sealing of the portal After the shield tail of the shield machine enters the hole, an arc-shaped plate is welded outside the steel box, and the cavity gap is filled with inert slurry for sealing. The portal is sealed in time. For the settlement compensation grouting, the reserved grouting holes on the shield tunnel segments are used. The grouting range is the first 4 rings starting from the portal. The grouting material is mainly cement single-fluid grout and supplemented by cement-sodium silicate double-fluid grout. The grouting sequence is from bottom to top, following the principle of multiple times, small amount and uniformity.
2. The shield starting portal sealing construction method applicable to water-rich environment according to claim 1, wherein In the step S1, the end freezing reinforcement construction specifically includes the following steps: S101. Drilling positioning: According to the design, 57 horizontal freezing holes are arranged, including 32 holes in the outer ring cup wall, and the total station is used for precise positioning; S102. Drilling construction: An MD-120A drill is used in cooperation with a diamond drill bit for drilling, and the drilling deviation is controlled within ≤150 mm; S103. Installation of freezing pipes: Insert Φ89×8 low-carbon seamless steel freezing pipes, and install the liquid supply pipe, horn and end cap; S104. Debugging of the freezing system: Connect the brine pipeline and install temperature and pressure monitoring devices; S105. Active freezing: Maintain the brine temperature at -28°C to -30°C, and continuously monitor the development of the freezing wall; S106. Detection of freezing effect: Detect through temperature measurement holes and exploration holes to confirm that the freezing wall has joined and the strength meets the standard.
3. The shield starting portal sealing construction method applicable to a water-rich environment according to claim 2, characterized in that, In the step S103, the installation of freezing pipes also includes: S1031. Installation of orifice pipes: Use Φ133×5 mm seamless steel pipes and install DN125 gate valves; S1032. Sealing treatment: The gap between the freezing pipe and the orifice pipe is sealed with leak-proof materials; S1033. The test leakage pressure is 0.8 - 1.0 MPa, and it is qualified after maintaining the pressure for 30 minutes; S1034. The drilling deviation is corrected in real time by using the theodolite light surveying method.
4. The shield starting portal sealing construction method applicable to water-rich environment according to claim 1, characterized in that, In the step S2, the installation of the portal sealing device also includes the following steps: S201. Positioning and welding of the steel box: Accurately position and weld the small steel box on the portal steel ring; S202. Installation of the curtain rubber plate: Install three layers of curtain rubber plates in sequence to ensure the sealing performance; S203. Installation of flap plates: Install two adjustable flap devices; S204. Sealing test: Conduct a 0.3 MPa water pressure test and maintain the pressure for 30 minutes without leakage.
5. The shield starting portal sealing construction method applicable to water-rich environment according to claim 4, characterized in that, In the step S2, the small steel box is in close contact with the first water stop curtain board of the portal and the station. The gaps are sealed with water swelling sealant. The water stop curtain rubber board and the portal brush form three water stop lines of defense. After the shield tail of the shield machine enters the hole, an arc-shaped plate is welded on the outside of the steel box, and the arc-shaped plate and the segment are reinforced with expansion bolts.
6. The shield starting portal sealing construction method applicable to a water-rich environment according to claim 1, characterized in that, In the step S3, the construction of breaking the portal also includes the following steps: S301. The first breaking: Chisel off the concrete protective layer within the portal contour line and cut off the backfill soil side reinforcement. S302. The second breaking: Chisel off the main body concrete in blocks and retain a protective layer about 200 mm thick. S303. The final breaking: Break the remaining protective layer before the shield starts and quickly clean up the muck.
7. The shield starting portal sealing construction method applicable to a water-rich environment according to claim 6, characterized in that, In the step S3, the breaking range of the portal is the diaphragm wall retaining structure within the reserved portal contour line with a diameter of 7100 mm. It is chiseled off from top to bottom in zones by manual high-pressure pneumatic picks. The breaking sequence is as follows: First, chisel off the concrete protective layer on the outside of the diaphragm wall and cut off the backfill soil side reinforcement. Then, break the portal concrete from top to bottom in blocks. Finally, clean up the waste residue and quickly assemble the negative ring segments to reduce the exposure time of the heading face.
8. The shield starting portal sealing construction method applicable to a water-rich environment according to claim 1, characterized in that In the step S4, the shield starting also includes the following steps: S401. Negative ring assembly: Assemble 8 rings of 1.5 m wide negative ring segments. S402. After the cutter head touches the heading face, start with a low thrust of ≤8000 kN and a low rotation speed of ≤1 rpm. S403. Synchronous grouting: Immediately conduct synchronous grouting after the shield tail passes through the sealing device. S404. Parameter adjustment: Dynamically adjust the tunneling parameters according to the monitoring data.
9. The shield starting portal sealing construction method applicable to a water-rich environment according to claim 8, characterized in that, In the step S4, the starting tunneling length is 67 rings, which are divided into a reinforced area (0 - 8 rings) and a non-reinforced area (9 - 67 rings). The installation position of the reaction frame is 12.25 m away from the portal. The starting tunneling parameters of the shield machine adopt the earth pressure balance mode, and synchronous grouting starts from the 4th positive ring.
10. The shield starting portal sealing construction device for the shield starting portal sealing construction method applicable to a rich water environment according to any one of claims 1-9, including a portal steel ring, characterized in that: A portal brush is arranged on the inner side of the portal steel ring. An inner side plate is arranged on the outside of the portal steel ring. A ring panel is arranged on the outside of the inner side plate. An inner side plate is arranged on the outside of the ring panel. A support plate is arranged between the inner side plate and the ring panel. Reinforcement bars are welded on the outside of the support plate. A curtain rubber board is arranged on the outside of the inner side plate and the outside plate. A circular ring plate is arranged on the outside of the curtain rubber board. A turning plate is arranged on the outside of the circular ring plate. Bolts are arranged between the support plate, the curtain rubber board, the circular ring plate and the turning plate. Grouting holes are arranged on the ring panel.