Shield lining split ring beam construction method based on unbonded prestress

Abstract

The invention belongs to the technical field of shield lining, and particularly relates to a shield lining split ring beam construction method based on unbonded prestress. Comprising the following steps: S1, prefabricating a segment of the split ring; s2, performing hot melting welding; s3, cast-in-situ lining of the split ring beam is conducted; s4, pulling the steel strand; and S5, filling. According to the invention, the overall stability of the duct piece at the opening is improved, and in addition, the tension supplementation is conveniently carried out or the anchorage device is cut off from the top ring beam and the prestressed steel strand is taken out from the bottom ring beam so as to realize quick replacement; concrete grout can be prevented from entering the HDPE corrugated pipe to block a hole channel in the duct piece prefabricating and pouring process, and meanwhile subsequent steel strand pulling and tensioning can be facilitated; according to the steel strand pulling device, the HDPE corrugated pipe can be rapidly sealed, meanwhile, steel strand pulling can be conducted by pulling the steel wire rope, rapid steel strand pulling is achieved, and meanwhile internal damage of the HDPE corrugated pipe is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of shield lining, and in particular relates to a method for constructing an open ring beam of a shield lining based on unbonded prestressed material. Background Art

[0002] The lining ring in a shield tunnel is typically composed of multiple segments and is originally a closed, continuous structure. However, in some cases, openings are required, such as those connecting passageways, vents, emergency exits, or other ancillary structures. The presence of these openings directly disrupts the circumferential continuity of the shield lining and significantly weakens the overall structural stability. To address this, ring beams are typically installed around these openings, leveraging their overall bending resistance to offset the localized stress concentrations caused by the openings.

[0003] Chinese patent application number 201911420978.2 discloses a connection structure between a track beam and a shield tunnel, including steel pipe segments, a base, and a support. The steel pipe segments are used to form a lining ring of the shield tunnel; the base includes a steel cage and a concrete layer, the steel cage is welded to the steel pipe segments, and the concrete layer is formed by pouring concrete on the steel cage; one end of the support is connected to the base, and the other end of the support is detachably connected to the track beam. Since the support is detachably connected to the track beam, it is convenient to adjust the position of the track beam according to the linear changes of the shield tunnel according to the needs of on-site construction, and it is also convenient to repair and replace the track beam. The patent embodiment also provides a construction method for the connection structure between the track beam and the shield tunnel and a shield tunnel. The construction method for the connection structure between the track beam and the shield tunnel is the construction method for the connection structure between the track beam and the shield tunnel, and the shield tunnel includes the connection structure between the track beam and the shield tunnel.

[0004] The larger the shield lining opening, the more complex the forces acting on the ring beam, and the larger the required ring beam cross-section. As shield diameters grow larger both domestically and internationally, the required openings are also increasing. Simply increasing the ring beam cross-section would have resulted in significant engineering waste and safety risks. Summary of the Invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides a shield lining open ring beam method based on unbonded prestressing. The present invention increases the overall stability of the pipe segment at the opening, and is convenient for supplementary tensioning or cutting off the anchor from the top ring beam and removing the prestressed steel strand from the bottom ring beam to achieve rapid replacement; the present invention seals the HDPE corrugated pipe embedded in the pipe segment through two heads and the connection of steel wire ropes, which can not only prevent concrete slurry from entering the HDPE corrugated pipe and clogging the channel during the prefabrication and pouring of the pipe segment, but also enable the steel wire ropes in the HDPE corrugated pipes of multiple pipe segments to be quickly connected after the prefabrication and installation of the pipe segment is completed, thereby forming a whole that is convenient for the subsequent threading and tensioning of the steel strands; the present invention can quickly seal the HDPE corrugated pipe through the cooperation of the head and the screw and the steel wire rope, and can also thread the steel strands by pulling the steel wire rope, thereby achieving rapid threading of the steel strands while reducing internal damage to the HDPE corrugated pipe.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for constructing an open ring beam of a shield lining based on unbonded prestressed material comprises the following steps:

[0008] S1. Prefabricated open-ring segments: Tie an HDPE corrugated pipe to the inner side of the prefabricated segment's steel cage. Insert both ends of the HDPE corrugated pipe into the end caps to seal the pipe. Connect the two end caps with a steel wire rope. Cast the prefabricated segment through the steel cage, and leave handhole grooves at the edges of the segment corresponding to the HDPE corrugated pipe.

[0009] S2. Hot melt welding: After the segments are assembled, the reserved hand hole grooves are butted together to form a reserved hand hole. The port of the HDPE corrugated pipe is opened at the reserved hand hole, and two adjacent steel wire ropes are connected. The adjacent HDPE corrugated pipes are then hot melt welded.

[0010] S3. Cast-in-place lining open ring beam: gradually remove the pipe segments at the designated openings, cast-in-place lining open ring beam, and reserve tensioning grooves for the HDPE corrugated pipe;

[0011] S4. Strand threading: After the lining open ring beam reaches the required strength, connect one end of the steel wire rope at the open ring beam to the steel wire rope, and pull the steel wire rope at the other end of the open ring beam to thread and tension the unbonded prestressed steel wire rope.

[0012] S5. Filling: After tensioning is completed, use epoxy resin glue to fill the reserved hand holes and tensioning grooves densely.

[0013] Furthermore, the head is a frustum structure, with a threaded hole running through the middle of the head, and a screw is threadedly connected to the threaded hole; one end of the screw is fixedly connected to the first fixed ear plate, and the other end of the screw is provided with a T-slot, in which a T-block is rotatably connected, and one end of the T-block is fixedly connected to the second fixed ear plate; the two second fixed ear plates in the same HDPE corrugated pipe are connected by a steel wire rope.

[0014] Furthermore, in S1, inserting both ends of the HDPE corrugated pipe into the sealing head for sealing includes the following steps:

[0015] S11. Connect one end of the steel wire rope to the second fixed ear plate of one of the heads, and then connect the other end of the steel wire rope to the second fixed ear plate of the other head. After the connection is completed, rotate the screw to close the two heads and seal the two ends of the HDPE corrugated pipe.

[0016] Furthermore, connecting two adjacent steel ropes in S2 includes the following steps:

[0017] S21. Rotate the two heads in the reserved hand holes to separate the heads from the screws, and then connect the first fixing ear plates of the two screws with a short steel wire rope.

[0018] Furthermore, connecting one end of the steel wire rope at the open ring beam to the steel strand in S4 includes the following steps:

[0019] S41. Rotate the head at one end of the steel wire rope at the open ring beam to separate it from the screw, and then fix the first fixing ear plate of the screw to one end of the steel strand.

[0020] Furthermore, pulling the steel wire rope at the other end of the open ring beam includes the following steps:

[0021] S42. Connect the first fixed ear plate on the screw connected to the steel wire rope at the other end of the open ring beam to the tension device, and pull out all the series-connected steel wire ropes in sequence through the tension device. After being pulled out, the steel strands remain inside the HDPE corrugated pipe.

[0022] Furthermore, the length × width × depth dimensions of the hand hole groove reserved in S1 are 5cm × 5cm × 8cm; the length × width × depth dimensions of the hand hole reserved in S1 are 10cm × 10cm × 8cm.

[0023] Furthermore, two HDPE corrugated pipes are symmetrically embedded on the inner side of each pipe segment, and hand holes are reserved at the longitudinal seams of the pipe segments; the annular seams of the pipe segments are the connecting seams between the annular upward pipe segments of the lining ring.

[0024] Furthermore, the lining open ring beam includes a top ring beam and a bottom ring beam, tensioning grooves are reserved on the top ring beam and the bottom ring beam, one end of the steel strand on the bottom surface of the top ring beam and the top surface of the bottom ring beam is the tensioning end, and the tensioning end is installed with an anchor.

[0025] Furthermore, the middle portion of the lining open ring beam is a shield opening, and the lining open ring beam is formed by pouring a post-cast frame column through the shield opening.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The post-tensioned unbonded prestressed steel strands of the present invention can provide a large circumferential tensile force after tensioning, which greatly alleviates the complex stress condition of the shield lining opening ring beam and increases the overall stability of the pipe segment at the opening, which has a more obvious effect on improving the safety of the lining opening; in addition, the prestressed tensioning grooves are respectively located on the bottom surface of the top ring beam and the top surface of the bottom ring beam. After the prestress is lost, it is convenient to re-tension or cut off the anchor from the top ring beam and take out the prestressed steel strands from the bottom ring beam to achieve rapid replacement; the present invention is simple in form and highly economical, and is particularly suitable for the ring beam at the large opening of a large-diameter shield, and has a more significant effect on improving the safety of the lining opening.

[0028] (2) The present invention seals the HDPE corrugated pipe embedded in the pipe segment through two end caps and a connection of steel wire ropes. This can prevent the concrete slurry from entering the HDPE corrugated pipe and clogging the channel during the prefabrication and pouring of the pipe segment. At the same time, it can also quickly connect the steel wire ropes in the HDPE corrugated pipes of multiple pipe segments after the prefabrication and installation of the pipe segment, thereby forming a whole to facilitate the subsequent threading and tensioning of the steel strands. Specifically, when the HDPE corrugated pipe needs to be sealed by connecting two end caps and a steel wire rope, first connect the two ends of the steel wire rope to the second fixed ear plate of the end cap. At this time, the seal The head is still loose and not closed tightly, and then the screw is rotated to unscrew the screws of the two heads to tension the wire rope. The T-slot of the screw and the T-block are rotated to connect and avoid twisting and knotting of the wire rope, thereby quickly realizing the closure of the HDPE corrugated pipe by the two heads; when it is necessary to connect two adjacent steel wire ropes, the head can be quickly separated from the screw by rotating the head. At this time, a short steel wire rope is used to connect the first fixed ear plates of the two screws to realize the rapid connection of the steel wire ropes in the HDPE corrugated pipe of multiple pipe segments, thereby forming a whole to facilitate the subsequent threading and tensioning of the steel strands.

[0029] (3) The present invention can not only quickly seal the HDPE corrugated pipe through the cooperation of the head and the screw and the wire rope, but also can thread the steel strands by pulling the steel strands, thereby achieving rapid threading of the steel strands while reducing internal damage to the HDPE corrugated pipe. Specifically, when it is necessary to thread the steel strands, multiple steel strands have been connected into a whole inside the HDPE corrugated pipe. By connecting one end of the steel strand to the first fixed ear plate on the screw at one end of the steel strand, and then pulling the first fixed ear plate on the screw at the other end of the steel strand through a tension device, rapid threading of the steel strands by pulling can be achieved, and the steel strands can be quickly inserted into the interior of the HDPE corrugated pipe. At the same time, the pulling method prevents the steel strands from frequently deviating from the moving direction when entering the interior of the HDPE corrugated pipe, thereby reducing internal damage to the HDPE corrugated pipe and making the HDPE corrugated pipe and its internal structure intact and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a flow chart of a method for constructing an open ring beam of a shield lining based on unbonded prestressed material according to the present invention;

[0031] Figure 2 This is a segment lining arrangement diagram of a shield lining open ring beam method based on unbonded prestressed steel according to the present invention;

[0032] Figure 3 This is a cross-sectional view of a segmental lining method based on an unbonded prestressed shield lining open ring beam method of the present invention;

[0033] Figure 4 This is a schematic diagram of a head and wire rope structure of a shield lining open ring beam method based on unbonded prestressed material according to the present invention;

[0034] Figure 5 This is a schematic diagram of a head and a screw dispersion structure of a shield lining open ring beam method based on unbonded prestressed material according to the present invention;

[0035] Figure 6 The present invention is a schematic diagram of a screw rod and T-block dispersed structure based on a shield lining open ring beam method without bonded prestressing.

[0036] The reference numerals are as follows:

[0037] 1. Segment; 2. Top ring beam; 3. Bottom ring beam; 4. Shield opening; 5. HDPE corrugated pipe; 6. Steel strand; 7. Tensioning end; 8. Tensioning groove; 9. Reserved hand hole; 10. Post-cast frame column for shield opening; 11. Segment longitudinal seam; 12. Segment circumferential seam; 13. Head; 14. Screw; 15. First fixing ear plate; 16. T-block; 17. Second fixing ear plate; 18. Threaded hole; 19. Wire rope; 20. T-slot. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. Of course, the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0039] Although the steps in the present invention are arranged with numbers, they are not intended to limit the order of the steps. Unless the order of the steps is clearly stated or the execution of a step requires other steps as a basis, the relative order of the steps can be adjusted. It is understood that the term "and / or" used herein refers to and covers any and all possible combinations of one or more of the associated listed items.

[0040] Example 1:

[0041] like Figures 1 to 6 As shown, a method for shield lining open ring beam based on unbonded prestressing includes the following steps:

[0042] S1. Prefabricated open-ring segment 1: Tie the HDPE corrugated pipe 5 to the inner side of the reinforcement cage of the prefabricated segment 1. Insert the two ends of the HDPE corrugated pipe 5 into the sealing head 13 to seal them. The two sealing heads 13 are connected by a steel wire rope 19. Cast the prefabricated segment 1 through the reinforcement cage, and reserve handhole grooves at the edges of the segment 1 corresponding to the positions of the HDPE corrugated pipe 5.

[0043] S2. Hot melt welding: After the segments 1 are assembled, the reserved hand hole grooves are butted together to form a reserved hand hole 9. The end of the HDPE corrugated pipe 5 is opened at the reserved hand hole 9, and two adjacent steel wire ropes 19 are connected. The adjacent HDPE corrugated pipes 5 are then hot melt welded.

[0044] S3, cast-in-situ lining open ring beam: gradually chisel away the pipe segments 1 at the designated openings, cast-in-situ lining open ring beam, and reserve tensioning grooves 8 for the HDPE corrugated pipe 5;

[0045] S4, stranding of steel strands 6: After the lining open ring beam reaches the required strength, connect one end of the steel wire rope 19 at the open ring beam to the steel strand 6, and pull the steel wire rope 19 at the other end of the open ring beam to strand and tension the unbonded prestressed steel strands 6;

[0046] S5. Filling: After the tensioning is completed, epoxy resin glue is used to fill the reserved hand hole 9 and the tensioning groove 8 tightly.

[0047] The post-tensioned unbonded prestressed steel strands of the present invention can provide a large circumferential tension after tensioning, which greatly alleviates the complex stress condition of the shield lining opening ring beam, increases the overall stability of the pipe segment 1 at the opening, and has a more obvious effect on improving the safety of the lining opening; in addition, the prestressed tensioning grooves 8 are respectively located on the bottom surface of the top ring beam 2 and the top surface of the bottom ring beam 3. After the prestress is lost, it is convenient to re-tension or cut off the anchor from the top ring beam 2 and take out the prestressed steel strands from the bottom ring beam 3 to achieve rapid replacement; the present invention is simple in form and highly economical, and is particularly suitable for the ring beams at large openings of large-diameter shields, and has a more significant effect on improving the safety of the lining opening.

[0048] Furthermore, the head 13 is a frustum structure, and a threaded hole 18 is provided through the middle of the head 13, and the threaded hole 18 is threadedly connected to the screw 14; one end of the screw 14 is fixedly connected to the first fixed ear plate 15, and the other end of the screw 14 is provided with a T-slot 20, and a T-block 16 is rotatably connected in the T-slot 20, and one end of the T-block 16 is fixedly connected to the second fixed ear plate 17; the two second fixed ear plates 17 in the same HDPE corrugated pipe 5 are connected by a steel wire rope 19.

[0049] The present invention seals the HDPE corrugated pipe 5 embedded in the pipe segment 1 by first connecting two heads 13 and a steel wire rope 19. This can prevent concrete slurry from entering the HDPE corrugated pipe 5 and clogging the channel during the prefabrication and pouring of the pipe segment 1. At the same time, after the prefabrication and installation of the pipe segment 1, the steel wire ropes 19 in the HDPE corrugated pipes 5 of multiple pipe segments 1 can be quickly connected, thereby forming a whole that is convenient for the subsequent threading and tensioning of the steel strand 6; this will be described in detail later.

[0050] Furthermore, in S1, inserting both ends of the HDPE corrugated pipe 5 into the sealing head 13 for sealing includes the following steps:

[0051] S11. Now connect one end of the wire rope 19 to the second fixed ear plate 17 of one of the heads 13, and then connect the other end of the wire rope 19 to the second fixed ear plate 17 of the other head 13. After the connection is completed, rotate the screw 14 to make the two heads 13 close together and seal the two ends of the HDPE corrugated pipe 5.

[0052] When the present invention requires the connection of two heads 13 and steel wire ropes to seal the HDPE corrugated pipe 5, first, the two ends of the steel wire rope 19 are connected to the second fixed ear plates 17 of the head 13. At this time, the head 13 is still loose and not tightly closed. Then, by rotating the screw 14, the screws of the two heads 13 are unscrewed to tension the steel wire rope 19. The T-slot 20 of the screw 14 is rotatably connected to the T-block 16 to avoid twisting and knotting of the steel wire rope 19, thereby quickly realizing the sealing of the HDPE corrugated pipe 5 by the two heads 13.

[0053] Furthermore, connecting two adjacent steel ropes 19 in S2 includes the following steps:

[0054] S21. Rotate the two sealing heads 13 in the reserved hand holes 9 to separate the sealing heads 13 from the screw rods 14, and then connect the first fixing lugs 15 of the two screw rods 14 with a short steel wire rope.

[0055] When it is necessary to connect two adjacent steel wire ropes 19 of the present invention, the head 13 can be quickly separated from the screw 14 by rotating the head 13. At this time, the first fixed ear plates 15 of the two screws 14 are connected by a short steel wire rope to achieve the rapid connection of the steel wire ropes 19 in the HDPE corrugated pipes 5 of multiple pipe segments 1, thereby forming a whole to facilitate the subsequent bundling and tensioning of the steel strands 6.

[0056] Furthermore, connecting one end of the steel wire rope 19 at the open ring beam to the steel strand 6 in S4 includes the following steps:

[0057] S41. Rotate the end cap 13 of the steel wire rope 19 at the open ring beam to separate it from the screw 14, and then fix the first fixing ear plate 15 of the screw 14 to one end of the steel strand 6.

[0058] Furthermore, pulling the steel wire rope 19 at the other end of the open ring beam includes the following steps:

[0059] S42. Connect the first fixed ear plate 15 on the screw rod 14 connected to the steel wire rope 19 at the other end of the open ring beam to the tension device, and pull out all the series-connected steel wire ropes 19 in sequence through the tension device. After being pulled out, the steel strand 6 remains inside the HDPE corrugated pipe 5.

[0060] The present invention can quickly seal the HDPE corrugated pipe 5 through the cooperation of the head 13 and the screw 14 with the wire rope 19, and at the same time, the steel strand 6 can be bundled by pulling the steel wire rope 19, so as to achieve rapid bundled bundle of the steel strand 6 while reducing the internal damage of the HDPE corrugated pipe 5; specifically, when it is necessary to bundle the steel strand 6, multiple steel wire ropes 19 have been connected into a whole inside the HDPE corrugated pipe 5, and one end of the steel strand 6 is connected to the first end of the screw 14 on the end of the steel wire rope 19. A fixed ear plate 15 is connected, and then the first fixed ear plate 15 on the screw 14 at the other end of the wire rope 19 is pulled by a tension device, so that the steel strand 19 can be quickly bundled by pulling, and the steel strand 19 can be quickly put into the interior of the HDPE corrugated pipe 5. At the same time, the pulling method prevents the steel strand 19 from frequently deviating from the moving direction when entering the interior of the HDPE corrugated pipe 5, thereby reducing the internal damage of the HDPE corrugated pipe 5, making the HDPE corrugated pipe 5 and its internal structure intact and improving the service life.

[0061] Furthermore, the length×width×depth dimensions of the hand hole groove reserved in S1 are 5cm×5cm×8cm; the length×width×depth dimensions of the hand hole 9 reserved in S1 are 10cm×10cm×8cm.

[0062] Furthermore, two HDPE corrugated pipes 5 are symmetrically embedded inside each pipe segment 1, and a hand hole 9 is reserved at the pipe segment longitudinal seam 11; the pipe segment annular seam 12 is the connecting seam between the pipe segments 1 facing upwards of the lining ring.

[0063] Furthermore, the lining open ring beam includes a top ring beam 2 and a bottom ring beam 3, and tensioning grooves 8 are reserved on the top ring beam 2 and the bottom ring beam 3. One end of the steel strand 6 on the bottom surface of the top ring beam 2 and the top surface of the bottom ring beam 3 is a tensioning end 7, and the tensioning end 7 is installed with an anchor.

[0064] Furthermore, the middle portion of the lining open ring beam is a shield opening 4, and the lining open ring beam is formed by pouring the shield opening post-cast frame column 10.

[0065] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this field, several improvements and changes can be made without departing from the creative concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A method for shield lining open ring beam based on unbonded prestressed material, characterized in that: The steps include: S1. Prefabricated open ring segment (1): Tie the HDPE corrugated pipe (5) to the inner side of the steel cage of the prefabricated segment (1), insert both ends of the HDPE corrugated pipe (5) into the end caps (13) for sealing, and connect the two end caps (13) via a steel wire rope (19); pour the prefabricated segment (1) through the steel cage, and reserve hand hole grooves at the corresponding positions of the edge of the segment (1) and the HDPE corrugated pipe (5); S2, hot melt welding: after the pipe segments (1) are assembled, the reserved hand hole grooves are butted together to form a reserved hand hole (9), the end of the HDPE corrugated pipe (5) is opened at the reserved hand hole (9), and two adjacent steel wire ropes (19) are connected, and the adjacent HDPE corrugated pipes (5) are hot melt welded; S3, cast-in-situ lining open ring beam: gradually chisel away the pipe segments (1) at the designated openings, cast-in-situ lining open ring beam, and reserve tensioning grooves (8) for the HDPE corrugated pipe (5); S4, threading of the steel strand (6): after the lining open ring beam reaches the required strength, one end of the steel wire rope (19) at the open ring beam is connected to the steel strand (6), and the steel wire rope (19) at the other end of the open ring beam is pulled to thread and tension the unbonded prestressed steel strand (6); S5. Filling: After the tensioning is completed, epoxy resin glue is used to fill the reserved hand hole (9) and the tensioning groove (8) tightly.

2. The method for constructing shield lining open ring beam based on unbonded prestressed material according to claim 1, characterized in that: The head (13) is a truncated cone structure. A threaded hole (18) is provided in the middle of the head (13). The threaded hole (18) is threadedly connected to the screw (14). One end of the screw (14) is fixedly connected to the first fixed ear plate (15). The other end of the screw (14) is provided with a T-slot (20). A T-block (16) is rotatably connected in the T-slot (20). One end of the T-block (16) is fixedly connected to the second fixed ear plate (17). The two second fixed ear plates (17) in the same HDPE corrugated pipe (5) are connected by a steel wire rope (19).

3. The method for constructing shield lining open ring beam based on unbonded prestressed material according to claim 2, characterized in that: In S1, the two ends of the HDPE corrugated pipe (5) are inserted into the sealing head (13) for sealing, which includes the following steps: S11. Now connect one end of the steel wire rope (19) to the second fixed ear plate (17) of one of the heads (13), and then connect the other end of the steel wire rope (19) to the second fixed ear plate (17) of the other head (13). After the connection is completed, rotate the screw (14) to make the two heads (13) close together and seal the two ends of the HDPE corrugated pipe (5).

4. The method for constructing shield lining open ring beam based on unbonded prestressed material according to claim 2, characterized in that: The process of connecting two adjacent steel wire ropes (19) in S2 comprises the following steps: S21. Rotate the two sealing heads (13) in the reserved hand holes (9) to separate the sealing heads (13) from the screw rods (14), and then connect the first fixing lugs (15) of the two screw rods (14) with a short steel wire rope.

5. The method for constructing shield lining open ring beam based on unbonded prestressed material according to claim 2, characterized in that: In S4, connecting one end of the steel wire rope (19) at the open ring beam to the steel strand (6) comprises the following steps: S41. Rotate the end cap (13) of the steel wire rope (19) at the open ring beam to separate it from the screw (14), and then fix the first fixing ear plate (15) of the screw (14) to one end of the steel strand (6).

6. The method for constructing shield lining open ring beam based on unbonded prestressed material according to claim 5, characterized in that: Pulling the steel wire rope (19) at the other end of the open ring beam comprises the following steps: S42. Connect the first fixing lug (15) on the screw (14) connected to the steel wire rope (19) at the other end of the open ring beam to the tension device, and pull out all the steel wire ropes (19) in series in sequence through the tension device. After being pulled out, the steel strand (6) remains inside the HDPE corrugated pipe (5).

7. The method for constructing shield lining open ring beam based on unbonded prestressed material according to claim 1, characterized in that: The length × width × depth of the hand hole groove reserved in S1 is 5 cm × 5 cm × 8 cm; the length × width × depth of the hand hole (9) reserved in S1 is 10 cm × 10 cm × 8 cm.

8. The method for constructing shield lining open ring beam based on unbonded prestressing according to claim 1, characterized in that: Two HDPE corrugated pipes (5) are symmetrically pre-buried on the inner side of each pipe segment (1), and a hand hole (9) is reserved at the pipe segment longitudinal seam (11); the pipe segment annular seam (12) is the connecting seam between the pipe segments (1) facing upward in the annular direction of the lining ring.

9. The method for constructing shield lining open ring beam based on unbonded prestressed material according to claim 1, characterized in that: The lining open ring beam comprises a top ring beam (2) and a bottom ring beam (3), tensioning grooves (8) are reserved on the top ring beam (2) and the bottom ring beam (3), one end of the steel strand (6) on the bottom surface of the top ring beam (2) and the top surface of the bottom ring beam (3) is a tensioning end (7), and an anchor is installed on the tensioning end (7).

10. The method for constructing shield lining open ring beam based on unbonded prestressed material according to claim 1, characterized in that: The middle portion of the lining open ring beam is a shield opening (4), and the lining open ring beam is formed by pouring a post-cast frame column (10) through the shield opening.

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