Shield tunneling construction method combining glass fiber reinforced piles and portal extension rings

Abstract

The invention relates to the technical field of shield construction start-up, and in particular to a shield construction start-up method of a combination of a glass fiber reinforced pile and a tunnel portal extension ring, comprising the following steps: step S1, workpiece manufacturing; step S2, pre-buried shield steel rings; step S3, installation of a steel ring tunnel portal extension device; step S4, shield start-up; the invention can avoid the use of manual breaking of tunnel portals, saving manpower and material resources, and avoiding the high-risk source of breaking the tunnel portal, and is environmentally friendly, safe and reliable; by setting the steel ring tunnel portal extension device, the shield can be quickly started, achieving barrier-free shield starting, saving construction period and cost; by setting the steel ring tunnel portal extension device, it can prevent tunnel portal soil, groundwater and slag improver from being lost from the gap between the shield shell and the tunnel portal when the shield starts excavating, and effectively reduces the later tunnel portal blocking cost.

Description

Technical Field

[0001] The invention relates to the technical field of shield starting construction, in particular to a shield starting construction method combining glass fiber reinforced piles and tunnel portal extension rings. Background Art

[0002] At present, most urban subway tunnels in China are constructed using the shield method, which has the advantages of fast construction speed, small environmental impact, excavation without stratum restrictions, and a wide range of applicable strata and soil types. However, during the tunnel excavation process, the launch and reception of the shield are the most risky links in shield construction, especially during the construction process of the shield entering and exiting the tunnel, where engineering accidents are most likely to occur and are mostly serious accidents, which are directly related to the safety of surrounding structures and the safety of the entire construction process. To a certain extent, it has become one of the key factors for the success or failure of shield tunnels.

[0003] The start of traditional shield tunneling requires manual chiseling of reinforced concrete retaining structures. During the chiseling process, the stratum is directly exposed, which is prone to engineering accidents such as water gushing and landslides. In addition, the manual pile chiseling working environment is extremely difficult, and the steel bars within the shield range need to be cleaned. If not cleaned thoroughly, the shield cutter head and tool will be damaged. Summary of the invention

[0004] In view of the above problems existing in the prior art, the present invention provides a shield starting construction method combining glass fiber reinforced piles and portal extension rings.

[0005] In order to solve the above technical problems, the present invention is solved by the following technical solutions.

[0006] The shield starting construction method of glass fiber reinforced piles and portal extension rings includes the following steps:

[0007] Step S1: Workpiece production

[0008] In this step, a first set of annular steel plates, a second set of annular steel plates, a rubber waterproof curtain, a fan-shaped folding flap, an arc-shaped plate and bolts are manufactured;

[0009] In this step, a method of combining a first set of annular steel plates, a second set of annular steel plates and a glass fiber reinforced pile enclosure structure is adopted, that is, two sets of annular steel plates are processed, the first set is installed during the structural construction, and the second set is installed before the shield starts, and the first set of annular steel plates and the second set of annular steel plates are of the same size;

[0010] Step S2: Pre-embed shield steel ring

[0011] In this step, the first set of annular steel plates is composed of 4 arc-shaped steel plates. The fiberglass reinforced piles are tied to the position of the tunnel portal in the shield starting shaft lining. The first set of annular steel plates that have been manufactured in blocks are accurately positioned and welded to the fiberglass reinforced piles of the end wall. Then, the end wall and tunnel portal formworks are erected and concrete is poured.

[0012] Step S3: Installation of steel ring extension tunnel door device

[0013] In this step, the steel ring extension tunnel door device is installed before the shield starts; the steel ring extension tunnel door device is composed of a rubber waterproof curtain, a fan-shaped folding flap, a second set of annular steel plates, an arc plate and bolts;

[0014] Before the shield machine starts, install the second set of annular steel plates, rubber waterproof curtains, curved plates and fan-shaped folding flaps on the first set of annular steel plates pre-buried in the tunnel portal, and finally tighten the nuts to install the guide rails;

[0015] Step S4: Shield tunneling starts

[0016] In this step, the shield machine enters the steel ring extension portal device from the starting base, and the shield machine is started to carry out the initial construction.

[0017] Preferably, in step S1, the rubber water-stop curtain is designed to have an outer diameter of 7000 mm, an inner diameter of 5800 mm, and a ring width of 600 mm; and the rubber water-stop curtain has 72 openings of φ24 mm.

[0018] Preferably, in step S1, the second set of annular steel plates is composed of 4 arc-shaped steel plates, and the connecting flanges between the 4 arc-shaped steel plates are provided with φ20mm holes, which are connected by M18×80mm bolts or positioning pins with the same configuration, and the bolts are fully equipped; a support frame is provided in the middle of the second set of annular steel plates.

[0019] Preferably, in step S1, there are 72 fan-shaped folding flaps in total, and the fan-shaped folding flaps are divided into an upper fixed plate, a middle pin shaft and a lower flap; one fan-shaped folding flap is arranged at each bolt hole.

[0020] Preferably, in step S1, the first set of annular steel plates and the second set of annular steel plates are of Q235B type, the welding rods between two adjacent arc-shaped steel plates are of E50 series and E43 series, and the weld height is 10 mm.

[0021] Preferably, 72 bolt holes are designed on both the first set of annular steel plates and the second set of annular steel plates. In step S2, stud screws are bolted into the bolt holes of the first set of annular steel plates.

[0022] Preferably, step S3 specifically includes the following steps:

[0023] Step S31: Install the second set of annular steel plates

[0024] In this step, before installation, first check the bolt hole positions of the first set of annular steel plates and the second set of annular steel plates, and install them in blocks on site. First install the bottom, then install the left and right waists, and finally install the top to close the ring. After the hole positions are aligned, tighten the nuts in time to fix them;

[0025] Step S32: Install rubber water-stop curtain

[0026] In this step, a crane is used for two-point lifting, and the reserved holes on the rubber waterproof curtain are slowly aligned with the screws. After the holes are aligned, nuts are used to temporarily fix them at intervals;

[0027] Step S33: Install the fan-shaped folding flap

[0028] In this step, 72 fan-shaped folding flaps are evenly arranged on the outer flange plate of the second set of annular steel plates. Since the second set of annular steel plates has a total of 72 bolt holes, a marking line is drawn along the center line of each bolt hole, and then the center of the fan-shaped folding flap is aligned with the bolt hole. After the hole position is aligned, the nut is tightened in time to fix it.

[0029] The beneficial effects of the present invention are as follows:

[0030] 1. Avoid using manual methods to break the tunnel door, save manpower and material resources, and avoid the high-risk source of breaking the tunnel door. It is environmentally friendly, safe and reliable.

[0031] 2. It can make up for the catastrophic accidents that may be caused by poor end reinforcement at the start of the shield tunnel, and the safety benefits are very significant.

[0032] 3. By setting up the steel ring to extend the tunnel gate device, the shield can be started quickly, achieving barrier-free start of the shield, saving construction time and cost.

[0033] 4. The setting of the steel ring extension tunnel portal device can prevent the tunnel portal soil, groundwater and slag improver from being lost from the gap between the shield shell and the tunnel portal when the shield starts to excavate, effectively reducing the cost of tunnel portal sealing in the later stage.

[0034] 5. By setting up the rubber water-stop curtain, while ensuring that the rubber water-stop curtain wraps the shield machine, the mud and water gushing phenomenon that may occur in the front is minimized to the greatest extent.

[0035] 6. With wide adaptability, the steel ring extended portal device can be applied to the initial process of glass fiber reinforced portals, with high efficiency and short construction period.

[0036] 7. Green and environmentally friendly, the steel ring extension portal device can be reused and circulated.

[0037] 8. The close connection between the previous and next processes enables continuous excavation and facilitates the rapid establishment of soil pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a flow chart of the construction process in Example 1;

[0039] Figure 2 This is a flow chart of step S3 in Example 1;

[0040] Figure 3 This is a first schematic diagram of the folding flap in Example 2;

[0041] Figure 4 This is a second schematic diagram of the folding flap in Example 2;

[0042] Figure 5 It is a partial structural schematic diagram of the folding flap in Example 2;

[0043] Figure 6 is a schematic diagram of a rotating plate in Example 2;

[0044] Figure 7 is a schematic diagram of the abutment plate in Example 2;

[0045] Figure 8 This is a schematic diagram of the T-shaped block in Example 2.

[0046] The parts indicated by the numbers in the accompanying drawings are as follows:

[0047] 110, mounting plate; 120, pressing plate; 130, rotating plate; 210, mounting groove; 220, half-thread bolt; 230, rotating groove; 231, abutment plate; 232, T-slot; 233, T-block; 234, nut; 310, threaded hole; 320, protrusion; 410, first through hole; 420, groove; 510, second through hole. DETAILED DESCRIPTION

[0048] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0049] Example 1

[0050] like Figure 1-2 As shown, this embodiment provides a shield starting construction method combining glass fiber reinforced piles and portal extension rings, which includes the following steps:

[0051] Step S1: Workpiece production

[0052] In this step, a first set of annular steel plates, a second set of annular steel plates, a rubber waterproof curtain, a fan-shaped folding flap, an arc-shaped plate and bolts are manufactured;

[0053] In this step, a method of combining a first set of annular steel plates, a second set of annular steel plates and a glass fiber reinforced pile enclosure structure is adopted, that is, two sets of annular steel plates are processed, the first set is installed during the structural construction, and the second set is installed before the shield starts, and the first set of annular steel plates and the second set of annular steel plates are of the same size;

[0054] Step S2: Pre-embed shield steel ring

[0055] In this step, the first set of annular steel plates is composed of 4 arc-shaped steel plates. The fiberglass reinforced piles are tied to the position of the tunnel portal in the shield starting shaft lining. The first set of annular steel plates that have been manufactured in blocks are accurately positioned and welded to the fiberglass reinforced piles of the end wall. Then, the end wall and tunnel portal formworks are erected and concrete is poured.

[0056] Step S3: Installation of steel ring extension tunnel door device

[0057] In this step, the steel ring extension tunnel door device is installed before the shield starts; the steel ring extension tunnel door device is composed of a rubber waterproof curtain, a fan-shaped folding flap, a second set of annular steel plates, an arc plate and bolts;

[0058] Before the shield machine starts, install the second set of annular steel plates, rubber waterproof curtains, curved plates and fan-shaped folding flaps on the first set of annular steel plates pre-buried in the tunnel portal, and finally tighten the nuts to install the guide rails;

[0059] Step S4: Shield tunneling starts

[0060] In this step, the shield machine enters the steel ring extension portal device from the starting base, and the shield machine is started to carry out the initial construction.

[0061] In this embodiment, the guide rails are welded at a position where the steel ring is extended by 600mm and there are two guide rails with a length of 100mm. The front end of the guide rails is made into a slope shape. The elevation of the guide rails is consistent with the elevation of the starting base track or slightly lower by 1 to 2mm, which can better avoid the "knocking" phenomenon when the shield machine starts.

[0062] By adopting the steel ring extension portal device when the shield machine starts in this embodiment, the risk of shield machine starting is greatly reduced, the safety of shield machine starting is ensured, and the work efficiency is improved.

[0063] In this embodiment, a construction method of extending the tunnel gate by using fiberglass reinforced piles and steel rings is adopted. There is no need to manually break down the tunnel gate, which saves manpower and material resources, avoids the high-risk source of breaking down the tunnel gate, and is environmentally friendly, safe and reliable.

[0064] In this embodiment, the catastrophic accident of the shield tunneling caused by the poor end reinforcement at the start of the shield tunneling is compensated, and the safety benefit is very significant.

[0065] In this embodiment, the use of glass fiber reinforced piles and steel rings to extend the tunnel gate device can enable the shield to start quickly, achieve barrier-free shield starting, save construction time and save costs.

[0066] In this embodiment, it is possible to better prevent the tunnel portal soil, groundwater, and slag improver from being lost from the gap between the shield shell and the tunnel portal when the shield machine starts excavating, thereby effectively reducing the cost of tunnel portal sealing at a later stage.

[0067] In this embodiment, the steel ring extended portal device can be applied to the initial process of the glass fiber reinforced portal, and has a wide adaptability, high efficiency and short construction period.

[0068] In this embodiment, the steel ring extended tunnel gate device can be reused and circulated.

[0069] In this embodiment, the front and rear working procedures are closely connected during construction, so that the shield machine can dig continuously, which is conducive to the rapid establishment of soil pressure.

[0070] In this embodiment, in step S1, the rubber water-stop curtain is designed to have an outer diameter of 7000 mm, an inner diameter of 5800 mm, and a ring width of 600 mm; and the rubber water-stop curtain has 72 openings of φ24 mm.

[0071] The structure of the rubber waterproof curtain in this embodiment can prevent the sealing effect of the rubber waterproof curtain from being damaged when the cutter head rotates.

[0072] In this embodiment, in step S1, the second set of annular steel plates is composed of 4 arc-shaped steel plates, and the connecting flanges between the 4 arc-shaped steel plates are provided with φ20mm holes, which are connected by M18×80mm bolts or positioning pins with the same configuration, and the bolts are fully equipped; a support frame is provided in the middle of the second set of annular steel plates.

[0073] In this embodiment, in step S1, there are 72 fan-shaped folding flaps in total, and the fan-shaped folding flaps are divided into an upper fixed plate, a middle pin shaft and a lower flap; one fan-shaped folding flap is arranged at each bolt hole.

[0074] In this embodiment, in step S1, the first set of annular steel plates and the second set of annular steel plates are of Q235B type, the welding rods between two adjacent arc-shaped steel plates are of E50 series and E43 series, and the weld height is 10 mm.

[0075] In this embodiment, 72 bolt holes are designed on both the first set of annular steel plates and the second set of annular steel plates. In step S2, stud screws are bolted into the bolt holes of the first set of annular steel plates.

[0076] In this embodiment, step S3 specifically includes the following steps:

[0077] Step S31: Install the second set of annular steel plates

[0078] In this step, before installation, first check the bolt hole positions of the first set of annular steel plates and the second set of annular steel plates, and install them in blocks on site. First install the bottom, then install the left and right waists, and finally install the top to close the ring. After the hole positions are aligned, tighten the nuts in time to fix them;

[0079] Step S32: Install rubber water-stop curtain

[0080] In this step, a crane is used for two-point lifting, and the reserved holes on the rubber waterproof curtain are slowly aligned with the screws. After the holes are aligned, nuts are used to temporarily fix them at intervals;

[0081] Step S33: Install the fan-shaped folding flap

[0082] In this step, 72 fan-shaped folding flaps are evenly arranged on the outer flange plate of the second set of annular steel plates. Since the second set of annular steel plates has a total of 72 bolt holes, a marking line is drawn along the center line of each bolt hole, and then the center of the fan-shaped folding flap is aligned with the bolt hole. After the hole position is aligned, the nut is tightened in time to fix it.

[0083] In this embodiment, before the shield machine cutter head enters the steel ring extension guide rail position from the starting base, grease is applied to the guide rail and the fan-shaped folding flap to reduce the friction with the shield machine and protect the steel ring extension portal device. The shield machine continues to push until the cutter head passes through the guide rail completely. At this time, the cutter head is still 50 cm away from the glass fiber reinforced pile. Considering that the glass fiber reinforced pile may have an invasion line, the cutter head is started at this time, and the cutter head speed is controlled at 0.8-1.0r / min. The cutter head continues to push forward and the spiral machine discharges slag until the pile grinding is completed. The steel ring extension portal device is designed to move the fan-shaped folding flap and the rubber water-stop curtain backward to protect the rubber water-stop curtain and the fan-shaped folding flap. The ultimate goal is to ensure that the shield machine enters the tunnel safely and smoothly. The steel ring extension portal device can also make the temporary sealing of the portal have a good waterproof effect, ensure the smooth start of the shield and reduce the formation loss at the start.

[0084] When the first set of annular steel plates and the second set of annular steel plates are connected by bolts, if there is a gap, it is necessary to add rubber pads and full welding measures at the joint position of the first set of annular steel plates and the second set of annular steel plates to ensure that the first set of annular steel plates and the second set of annular steel plates are sealed and intact as a whole.

[0085] In order to ensure that the first set of annular steel plates can be firmly embedded in the shaft lining structure, the back of the first set of annular steel plates is connected to the glass fiber reinforcement piles of the shield starting shaft lining structure, and each embedded bolt is connected to the glass fiber reinforcement piles of the shaft lining. After the first set of annular steel plates are processed and formed, they will be embedded in the starting shaft lining structure in time during the construction.

[0086] The longitudinal deviation of the position of the first set of annular steel plates shall not be greater than 5mm. The first set of annular steel plates must be firmly embedded in the concrete and close to the formwork on one side. They must not become loose during concrete pouring and affect their use.

[0087] Example 2

[0088] like Figure 3-8 As shown, the present embodiment provides a folding flap used in Embodiment 1, characterized in that: it includes a mounting plate 110 fixed to a second annular steel plate by bolts; a rotatable pressure plate 120 extending toward the shield opening is provided at one end of the mounting plate 110 facing the shield opening; two mounting grooves 210 are symmetrically provided on the end surface of the pressure plate 120 facing the outer end of the shield opening, and a rotating plate 130 is rotatably provided in the mounting groove 210, one end of which can be rotated to the outside of the pressure plate 120 to support the rubber water-stop curtain.

[0089] In this embodiment, when in use, the mounting plate 110 of the folding flap is first fixed to the second annular steel plate by bolts, and then the folding flap is adjusted according to actual use needs to achieve better matching with the rubber waterproof curtain cloth;

[0090] When the distance between two adjacent folding flaps is large, one end of the rotating plate 130 can be rotated outside the mounting groove 210, so as to support the rubber water-stop curtain between the two adjacent folding flaps, thereby better improving the supporting effect of the folding flap on the rubber water-stop curtain and ensuring the sealing of the rubber water-stop curtain; and the folding flap in this embodiment can arbitrarily adjust the position of the rotating plate 130 by rotating the rotating plate 130 to different angles, thereby achieving a better supporting effect on the rubber water-stop curtain.

[0091] In this embodiment, a threaded hole 310 is provided at one end of the mounting groove 210 close to the mounting plate 110, and a first through hole 410 is provided at a position of the rotating plate 130 corresponding to the threaded hole 310. The rotating plate 130 is fixed by a half-thread bolt 220 passing through the first through hole 410 and extending into the threaded hole 310.

[0092] Through the structure in this embodiment, it is possible to better achieve that the rotating plate 130 remains fixed in the mounting groove 210 while rotating.

[0093] In this embodiment, a plurality of protrusions 320 are evenly arranged in the installation groove 210 and along the circumference of the threaded hole 310 ; and grooves 420 matching with the protrusions 320 are arranged at positions on the rotating plate 130 corresponding to the protrusions 320 .

[0094] Through the arrangement of the protrusion 320 and the groove 420 in this embodiment; when the rotating plate 130 supports the rubber water-stop curtain, the rubber water-stop curtain will squeeze the rotating plate 130 under the impact of the water flow, which may cause one end of the rotating plate 130 to be squeezed into the installation groove 210. After the rotating plate 130 rotates, the protrusion 320 will be stuck in the groove 420, so that there is a certain resistance to the rotation of the rotating plate 130, so that the rotating plate 130 is not easy to rotate, thereby ensuring the stability of the rotating plate 130 in supporting the rubber water-stop curtain.

[0095] In this embodiment, a rotating groove 230 connected to both mounting grooves 210 is provided on the end surface of the pressure plate 120 facing the outer end of the shield tunnel opening and located between the two mounting grooves 210. A resist plate 231 is provided in the rotating groove 230. The resist plate 231 can rotate along the center position of the resist plate 231 and can move in the direction toward the mounting plate 110 to achieve squeezing of the two ends of the resist plate 231 with the rotating plate 130.

[0096] Through the setting of the anti-plate 231 in the present embodiment, after one end of the rotating plate 130 is rotated to the outside of the mounting groove 210, the anti-plate 231 is rotated and moved so that the two ends of the anti-plate 231 are respectively in contact with the corresponding rotating plate 130, thereby playing a supporting role for the rotating plate 130. When the rubber water-stop curtain squeezes the rotating plate 130, the rotating plate 130 will squeeze the anti-plate 231. Therefore, under the supporting action of the anti-plate 231, the rotating plate 130 must overcome a large resistance to rotate into the mounting groove 210, thereby further improving the stability of the rotating plate 130 in supporting the rubber water-stop curtain.

[0097] In this embodiment, a T-shaped slot 232 extending toward the mounting plate 110 is provided on the side wall of the rotating slot 230; a T-shaped block 233 cooperating with the T-shaped slot 232 is provided in the T-shaped slot 232; a second through hole 510 for the T-shaped block 233 to pass through is provided on the abutment plate 231; an external thread is provided at the end of the T-shaped block 233 passing through the second through hole 510; the abutment plate 231 is fixed in the rotating slot 230 by cooperating with the T-shaped block 233 through a nut 234.

[0098] When in use, after the rotating plate 130 is adjusted, the support plate 231 can be rotated around the T-shaped plate so that the support plate 231 is perpendicular to the extension direction of the T-shaped slot 232, and the nut 234 on the T-shaped block 233 is rotated in a direction away from the support plate 231, thereby releasing the fixation of the T-shaped block 233 in the T-shaped slot 232, so that the T-shaped block 233 can move in the T-shaped slot 232 along the extension direction of the T-shaped slot 232, thereby The position of the push plate 231 can be adjusted by moving. When the push plate 231 moves to the two ends and contacts the corresponding rotating plate 130, at this time, the nut 234 on the T-block 233 is rotated in the opposite direction, so that the T-block 233 is fixed in the T-slot 232 again, so that the push plate 231 is fixed in the mounting groove 210, so that the push plate 231 can provide better support for the rotating plate 130, so that the rotating plate 130 can better support the rubber water-stop curtain.

[0099] In conclusion, the above is only a preferred embodiment of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the patent of the present invention.

Claims

1. The shield starting construction method of glass fiber reinforced piles and portal extension rings is characterized by: The following steps are involved: Step S1: Workpiece production In this step, a first set of annular steel plates, a second set of annular steel plates, a rubber waterproof curtain, a fan-shaped folding flap, an arc-shaped plate and bolts are manufactured; In this step, a method of combining a first set of annular steel plates, a second set of annular steel plates and a glass fiber reinforced pile enclosure structure is adopted, that is, two sets of annular steel plates are processed, the first set is installed during the structural construction, and the second set is installed before the shield starts, and the first set of annular steel plates and the second set of annular steel plates are of the same size; Step S2: Pre-embed shield steel ring In this step, the first set of annular steel plates is composed of 4 arc-shaped steel plates. The fiberglass reinforced piles are tied to the position of the tunnel portal in the shield starting shaft lining. The first set of annular steel plates that have been manufactured in blocks are accurately positioned and welded to the fiberglass reinforced piles of the end wall. Then, the end wall and tunnel portal formworks are erected and concrete is poured. Step S3: Installation of steel ring extension tunnel door device In this step, the steel ring extension tunnel door device is installed before the shield starts; the steel ring extension tunnel door device is composed of a rubber waterproof curtain, a fan-shaped folding flap, a second set of annular steel plates, an arc plate and bolts; Before the shield machine starts, install the second set of annular steel plates, rubber waterproof curtains, curved plates and fan-shaped folding flaps on the first set of annular steel plates pre-buried in the tunnel portal, and finally tighten the nuts to install the guide rails; Step S4: Shield tunneling starts In this step, the shield machine enters the steel ring extension portal device from the starting base, and the shield machine is started to carry out the initial construction.

2. The shield tunneling construction method of combining glass fiber reinforced piles and portal extension rings according to claim 1 is characterized in that: In step S1, the rubber water-stop curtain is designed to have an outer diameter of 7000 mm, an inner diameter of 5800 mm, and a ring width of 600 mm; and the rubber water-stop curtain has 72 openings of φ24 mm.

3. The shield tunneling construction method of combining glass fiber reinforced piles and portal extension rings according to claim 2 is characterized by: In step S1, the second set of annular steel plates is composed of 4 arc-shaped steel plates, and the connecting flanges between the 4 arc-shaped steel plates are provided with φ20mm holes, which are connected by M18×80mm bolts or positioning pins with the same configuration, and the bolts are fully equipped; a support frame is provided in the middle of the second set of annular steel plates.

4. The shield tunneling construction method of combining glass fiber reinforced piles and portal extension rings according to claim 3 is characterized by: In step S1, there are 72 fan-shaped folding flaps in total, and the fan-shaped folding flaps are divided into an upper fixed plate, a middle pin shaft and a lower flap; one fan-shaped folding flap is arranged at each bolt hole.

5. The shield tunneling construction method of combining glass fiber reinforced piles and portal extension rings according to claim 4 is characterized in that: In step S1, the first set of annular steel plates and the second set of annular steel plates are of Q235B type, the welding rods between two adjacent arc-shaped steel plates are of E50 series and E43 series, and the weld height is 10 mm.

6. The shield tunneling construction method of combining glass fiber reinforced piles and portal extension rings according to claim 5 is characterized in that: 72 bolt holes are designed on both the first set of annular steel plates and the second set of annular steel plates. In step S2, stud screws are bolted into the bolt holes of the first set of annular steel plates.

7. The shield tunneling construction method of combining glass fiber reinforced piles and portal extension rings according to claim 6 is characterized by: Step S3 specifically includes the following steps: Step S31: Install the second set of annular steel plates In this step, before installation, first check the bolt hole positions of the first set of annular steel plates and the second set of annular steel plates, and install them in blocks on site. First install the bottom, then install the left and right waists, and finally install the top to close the ring. After the hole positions are aligned, tighten the nuts in time to fix them; Step S32: Install rubber water-stop curtain In this step, a crane is used for two-point lifting, and the reserved holes on the rubber waterproof curtain are slowly aligned with the screws. After the holes are aligned, nuts are used to temporarily fix them at intervals; Step S33: Install the fan-shaped folding flap In this step, 72 fan-shaped folding flaps are evenly arranged on the outer flange plate of the second set of annular steel plates. Since the second set of annular steel plates has a total of 72 bolt holes, a marking line is drawn along the center line of each bolt hole, and then the center of the fan-shaped folding flap is aligned with the bolt hole. After the hole position is aligned, the nut is tightened in time to fix it.

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