A bidirectional collaborative reinforcement structure and construction method for shield tunnel segments

Abstract

This invention proposes a bidirectional collaborative reinforcement structure and construction method for shield tunnel segments, relating to the field of tunnel reinforcement technology. Addressing the problem of poor reliability in existing shield tunnel segment reinforcement structures, the reinforcement structure of this invention includes: an arc-shaped steel strip, steel strands, steel strand channels, reserved holes in the steel strip, and operating holes. The reserved holes and operating holes are located within the segments. The first end of the arc-shaped steel strip is embedded in one of the segments, and the second end of the arc-shaped steel strip is inserted into a reserved hole in a longitudinally adjacent segment. A through-hole for steel strands is reserved on the arc-shaped steel strip, and a steel strand channel is reserved within the segment. The steel strand channel connects the operating hole and the through-hole for steel strands within the same segment, as well as connecting the reserved through-holes for steel strands on two circumferentially adjacent arc-shaped steel strips. The steel strands enter the steel strand channel from one operating hole, pass sequentially through the circumferentially adjacent reserved through-holes for steel strands, and exit from the operating hole of the circumferentially adjacent segment. This achieves longitudinal and circumferential collaborative reinforcement with high reliability.

Description

Technical Field

[0001] This invention relates to the field of tunnel reinforcement technology, and in particular to a bidirectional collaborative reinforcement structure and construction method for shield tunnel segments. Background Technology

[0002] Shield tunnel segment reinforcement refers to engineering measures that improve the segment's own and inter-segment stress-bearing capacity by adding mechanical support components and optimizing structural connection methods, thereby compensating for the performance degradation of the segment caused by external environment or structural defects and ensuring the stability of the tunnel structure.

[0003] Existing methods for reinforcing shield tunnel structures mainly include longitudinal reinforcement and circumferential reinforcement. Longitudinal reinforcement methods include: adding longitudinal steel tie rods between tunnel segments; pre-embedding tie rod holes at the segment circumferential joints; inserting the steel tie rods after assembly and tensioning them for fixation; and bonding arc-shaped steel strips to the outside or inside of the tunnel to improve longitudinal integrity through the adhesion between the steel strips and the tunnel segments. Circumferential reinforcement methods include: constructing a formwork and pouring concrete inside a single-ring segment to form a ring-shaped clamp, which constrains the circumferential deformation of the segment; and pre-embedding circumferential channels in the segment, inserting steel strands, and tensioning them for fixation, using the prestress of the steel strands to limit the circumferential expansion of the segment.

[0004] Existing technologies that use longitudinal or circumferential reinforcement to strengthen shield tunnel segments in a single dimension neglect the bidirectional correlation of stress on the tunnel segments. Uneven longitudinal settlement can cause circumferential stress concentration in the segments, while excessive circumferential loads can lead to the opening of longitudinal circumferential joints. Single-dimensional reinforcement can only solve local problems and cannot form an overall stress-bearing system, resulting in poor reliability of the reinforced structure.

[0005] Therefore, developing a bidirectional collaborative reinforcement structure and construction method for shield tunnel segments is of great significance for improving the reliability of reinforcement. Summary of the Invention

[0006] To address the issue of poor reliability of shield tunnel segment reinforcement structures in existing technologies, this invention proposes a bidirectional collaborative reinforcement structure for shield tunnel segments. The segments are longitudinally staggered and spliced, and the reinforcement structure includes: an arc-shaped steel strip, steel strands, steel strand channels, reserved holes in the steel strip, and operating holes.

[0007] The pre-reserved hole in the steel strip and the operating hole are provided inside the tube segment;

[0008] The arc-shaped steel strip is fixedly connected to two longitudinally adjacent pipe segments. The first end of the arc-shaped steel strip is pre-embedded in one of the pipe segments, and the second end of the arc-shaped steel strip is inserted into the steel strip reserved hole in the other pipe segment.

[0009] The arc-shaped steel strip has a reserved through hole for steel strands, and the segment has a reserved channel for steel strands. The channel for steel strands is used to connect the operating hole and the through hole for steel strands in the same segment, as well as to connect the reserved through holes for steel strands on two adjacent arc-shaped steel strips in the circumferential direction.

[0010] The steel strand enters the steel strand channel through the operating hole in one of the segments containing the two adjacent circumferential arc-shaped steel strips, passes through the steel strand through holes on the two adjacent circumferential arc-shaped steel strips in sequence, and then enters the operating hole in the other segment containing the two adjacent circumferential arc-shaped steel strips.

[0011] Furthermore, the first end of the arc-shaped steel strip is provided with an upright steel strip, which is welded and fixed to the circumferential main reinforcement of the segment.

[0012] Furthermore, a fixing steel plate is provided in the reserved hole of the steel strip, and the fixing steel plate is used to fix the second end of the arc-shaped steel strip.

[0013] Furthermore, the fixing steel plate is an arc-shaped hollow steel section, and the outer contour of the fixing steel plate fits against the inner wall of the reserved hole in the steel strip.

[0014] Furthermore, a through hole is provided on the fixing steel plate, which communicates with the through hole of the steel strand on the arc-shaped steel strip, and the diameter of the through hole of the fixing steel plate is larger than the diameter of the through hole of the steel strand.

[0015] Furthermore, the reinforcement structure also includes an anchoring assembly for securing the steel strand within the operating hole.

[0016] Furthermore, the anchoring assembly includes a lock and a washer, the lock being locked to the steel strand, and the washer being disposed between the lock and the inner wall of the operating hole.

[0017] Furthermore, the arc-shaped steel strip is disposed at both ends of the circumferential direction of the tube segment, and the position of the arc-shaped steel strip satisfies the following conditions: the ratio of the distance to the longitudinal edge of the tube segment to the circumferential width of the tube segment is a first preset value, and the ratio of the distance to the surface of the tube segment to the thickness of the tube segment is a second preset value.

[0018] Furthermore, the ratio of the width of the arc-shaped steel strip to the circumferential width of the tube segment satisfies a third preset value.

[0019] This invention also proposes a construction method for a bidirectional collaborative reinforcement structure for shield tunnel segments, the specific steps of which include:

[0020] S1. Process the arc-shaped steel strip, reserve through holes for steel strands on the arc-shaped steel strip, and set a standing steel strip at the first end of the arc-shaped steel strip;

[0021] S2. Process the pipe segments, embed the first end of the arc-shaped steel strip into the pipe segment, weld and fix the upright steel strip to the circumferential main reinforcement of the pipe segment, and reserve steel strip reserved holes, operating holes and steel strand channels in the longitudinal adjacent pipe segments.

[0022] S3. Assemble the segments sequentially using a longitudinal staggered splicing method;

[0023] S4. After the segments are assembled, the steel strands are inserted into the steel strand channel through the operating hole in one of the segments where the two adjacent circumferential arc steel strips are located. After passing through the reserved steel strand through holes on the two adjacent circumferential arc steel strips in sequence, the strands are then passed out through the operating hole in the other segment where the two adjacent circumferential arc steel strips are located.

[0024] S5. By tensioning adjacent steel strands through the operating holes, the segments are simultaneously squeezed in the circumferential and longitudinal directions to achieve bidirectional synergistic reinforcement of the segments.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] Firstly, the reinforcement structure of the present invention includes: an arc-shaped steel strip, steel strands, a steel strand channel, a reserved hole in the steel strip, and an operating hole; the reserved hole in the steel strip and the operating hole are set inside the segment; the first end of the arc-shaped steel strip is embedded in one of the segments, and the second end of the arc-shaped steel strip is inserted into the reserved hole in the steel strip in the longitudinally adjacent segment; a reserved through hole for steel strands is reserved on the arc-shaped steel strip, and a reserved channel for steel strands is reserved inside the segment. The steel strand channel is used to connect the operating hole and the through hole for steel strands in the same segment, as well as to connect the reserved through holes for steel strands on two circumferentially adjacent arc-shaped steel strips; the steel strand enters the steel strand channel from one operating hole, passes through the reserved through holes for steel strands in the circumferential direction in sequence, and then exits from the operating hole of the circumferentially adjacent segment. By using a connection method where one end of an arc-shaped steel strip is pre-embedded and the other end is inserted, longitudinally adjacent segments are directly and rigidly connected, effectively limiting deformations such as longitudinal misalignment and inter-ring opening. Steel strands are passed through through holes in adjacent circumferentially arranged arc-shaped steel strips to achieve circumferential series connection. Tensioning the steel strands through the operating holes generates circumferential pre-tensioning force on the segments, suppressing circumferential expansion or cracking caused by lateral pressure. Through longitudinal and circumferential synergistic reinforcement, the gaps between segments are effectively tightened, resulting in high reliability. Simultaneously, the pre-reserved steel strand channels within the segments precisely connect the operating holes and the through holes of the steel strips, avoiding wear caused by direct friction between the steel strands and the segment concrete, thus extending the service life of the steel strands.

[0027] Secondly, a fixing steel plate is installed inside the pre-reserved hole of the steel strip. The fixing steel plate is used to fix the second end of the arc-shaped steel strip. The fixing steel plate is made of arc-shaped hollow steel, and its outer contour fits against the inner wall of the pre-reserved hole of the steel strip. The fixing steel plate has a pre-reserved through hole, which is connected to the pre-reserved through hole of the steel strand on the arc-shaped steel strip. The diameter of the fixing steel plate through hole is larger than the diameter of the pre-reserved through hole of the steel strand. The fixing steel plate can evenly transfer the force on the second end of the arc-shaped steel strip to the segment concrete, avoiding local compression of the steel strip that could cause cracking of the pre-reserved hole wall. The fixing steel plate has the dual function of fixing the arc-shaped steel strip and guiding the steel strand. At the same time, the through hole of the fixing steel plate is connected to the through hole of the arc-shaped steel strip, ensuring that the circumferential preload generated by the tensioning of the steel strand can be transferred to the arc-shaped steel strip through the fixing steel plate, thereby driving the longitudinal segment to be compressed in a coordinated manner, realizing the linkage effect of circumferential tensioning and longitudinal compression, which is beneficial to longitudinal and circumferential coordinated reinforcement. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a plan view of a bidirectional collaborative reinforcement structure for shield tunnel segments provided in an embodiment of the present invention;

[0030] Figure 2 This is a partially enlarged view of the arc-shaped steel strip provided in an embodiment of the present invention;

[0031] Figure 3 This is a partial enlarged view of the operating hole provided in an embodiment of the present invention;

[0032] Figure 4 This is a partial enlarged view of the steel strip reserved hole provided in an embodiment of the present invention;

[0033] Figure 5 This is a flowchart of a construction method for a bidirectional collaborative reinforcement structure for shield tunnel segments provided in an embodiment of the present invention.

[0034] In the diagram: 1-arc-shaped steel strip, 2-steel strand, 3-steel strand channel, 4-steel strip reserved hole, 5-operating hole, 6-steel strand through hole, 7-lock, 8-washer, 9-fixing steel plate, 10-fixing steel plate through hole, 11-standing steel strip. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0036] The specific embodiments of the present invention will be described below.

[0037] To address the poor reliability of existing shield tunnel segment reinforcement structures, this invention provides a reinforcement structure comprising: an arc-shaped steel strip, steel strands, steel strand channels, pre-reserved holes in the steel strip, and operating holes. The pre-reserved holes and operating holes are located within the tunnel segments. The first end of the arc-shaped steel strip is embedded in one of the tunnel segments, and the second end is inserted into a pre-reserved hole in a longitudinally adjacent tunnel segment. A steel strand through-hole is pre-reserved on the arc-shaped steel strip, and a steel strand channel is pre-reserved within the tunnel segment. This channel connects the operating hole and the steel strand through-hole within the same tunnel segment, as well as connecting the pre-reserved steel strand through-holes on two circumferentially adjacent arc-shaped steel strips. The steel strand enters the steel strand channel from one operating hole, passes sequentially through the circumferentially adjacent pre-reserved steel strand through-holes, and exits from the operating hole of the circumferentially adjacent tunnel segment. This achieves longitudinal and circumferential coordinated reinforcement with high reliability.

[0038] This invention provides a bidirectional collaborative reinforcement structure for shield tunnel segments, with longitudinally staggered joint splicing of the segments. Figure 1 This is a plan view of a bidirectional collaborative reinforcement structure for shield tunnel segments provided in an embodiment of the present invention. Figure 2 This is a partially enlarged view of the arc-shaped steel strip provided in an embodiment of the present invention. Figure 3 This is a partial enlarged view of the operating hole provided in an embodiment of the present invention. Figure 4 This is a partially enlarged view of the pre-reserved hole in the steel strip provided in an embodiment of the present invention. Figure 1-4 As shown, the reinforcement structure includes: an arc-shaped steel strip 1, steel strands 2, steel strand channels 3, steel strip reserved holes 4, and operating holes 5; the steel strip reserved holes 4 and operating holes 5 are set inside the segments; the arc-shaped steel strip 1 is fixedly connected to two longitudinally adjacent segments, the first end of the arc-shaped steel strip 1 is embedded in one of the segments, and the second end of the arc-shaped steel strip 1 is inserted into the steel strip reserved hole 4 in the other segment; steel strand through holes 6 are reserved on the arc-shaped steel strip 1, and steel strand channels 3 are reserved inside the segments. The steel strand channels 3 are used to connect the operating holes 5 and steel strand through holes 6 in the same segment, as well as to connect the reserved steel strand through holes 6 on two circumferentially adjacent arc-shaped steel strips 1; the steel strand 2 enters the steel strand channel 3 from the operating hole 5 in one segment where two circumferentially adjacent arc-shaped steel strips 1 are located, passes through the steel strand through holes 6 on two circumferentially adjacent arc-shaped steel strips 1 in sequence, and then enters the operating hole 5 in another segment where two circumferentially adjacent arc-shaped steel strips are located.

[0039] The curved steel strip 1 is the core component for longitudinal reinforcement of the tunnel segments, used to enhance the longitudinal stiffness of the segments and limit uneven longitudinal deformation. The steel strand 2 is the core component for circumferential reinforcement of the tunnel segments, passing through pre-reserved steel strand channels within the segments and connecting the curved steel strips to adjacent circumferential segments. The steel strand channel 3 is a channel pre-reserved during segment prefabrication, with the path from the operating hole to the curved steel strip being oblique. The steel strip pre-reserved hole 4 is a structure pre-reserved during segment prefabrication to accommodate the second end of the curved steel strip. The operating hole 5 is specifically located at the steel strand outlet on the inner side of the segment, providing the operating space for steel strand insertion and tensioning. The steel strand through hole 6 is a pre-drilled hole in the curved steel strip, communicating with the steel strand channels within the segments, allowing the steel strands to pass through and connecting to the curved steel strip.

[0040] During segment assembly, the first end of the arc-shaped steel strip 1 is pre-embedded inside the segment, and the second end is inserted into the reserved hole 4 of the steel strip of the longitudinally adjacent segment, forming a rigid connection in the longitudinal direction of the segment, enhancing the longitudinal stiffness of the segment and limiting uneven longitudinal deformation of the tunnel. After the segment assembly is completed, the steel strand channel 3 reserved during segment prefabrication connects the operating hole and steel strand through hole in the same segment, as well as the reserved steel strand through hole on two adjacent circumferential arc-shaped steel strips, forming a complete steel strand threading path. The steel strand 2 enters from the operating hole 5 of one segment where the adjacent circumferential arc-shaped steel strip is located, passes through the through hole 6 of the two arc-shaped steel strips in sequence through the steel strand channel 3, and finally exits from the operating hole 5 of another segment, realizing the series connection of adjacent circumferential segments. The steel strand 2 is tensioned through the operating hole 5 to apply a preset prestress. Since the steel strand channel 3 is designed at an angle, the force generated by tensioning will be transmitted to the segment in both the circumferential and longitudinal directions simultaneously, realizing synchronous clamping in both the circumferential and longitudinal directions.

[0041] This embodiment of the technical solution directly and rigidly connects longitudinally adjacent segments through a connection method where one end of an arc-shaped steel strip is pre-embedded and the other end is inserted. This effectively limits deformations such as longitudinal misalignment and inter-ring opening of the segments. By using steel strands passing through the through holes of adjacent circumferentially arranged arc-shaped steel strips, circumferential series connection is achieved. Tensioning the steel strands through the operating holes generates a circumferential pre-tensioning force on the segments, suppressing circumferential expansion or cracking caused by lateral pressure. Through longitudinal and circumferential synergistic reinforcement, the gaps between segments are effectively tightened, resulting in high reliability. Simultaneously, the steel strand channels pre-reserved within the segments precisely connect the operating holes and the through holes of the steel strips, avoiding wear caused by direct friction between the steel strands and the segment concrete, thus extending the service life of the steel strands.

[0042] For details, please refer to Figure 2 The first end of the arc-shaped steel strip 1 is provided with a standing steel strip 11, which is welded and fixed to the circumferential main reinforcement of the pipe segment.

[0043] In this embodiment, the upright steel strip 11 is an auxiliary structure installed at the pre-embedded end (i.e., the first end) of the arc-shaped steel strip. It is integrally constructed with the arc-shaped steel strip, perpendicular to the main body of the arc-shaped steel strip, and made of the same material as the arc-shaped steel strip. The upright steel strip is fixed by welding to the circumferential main reinforcement of the segment, thereby enhancing the fixation stability of the pre-embedded end of the arc-shaped steel strip. The circumferential main reinforcement refers to the main load-bearing steel bars arranged circumferentially along the segment during the prefabrication of the segment. It is the core component of the segment's reinforcement skeleton, bearing the circumferential force of the segment, and is also the load-bearing carrier for the arc-shaped steel strip to be fixed by the upright steel strip, ensuring that the force of the arc-shaped steel strip is transmitted to the overall structure of the segment.

[0044] The welding of the upright steel strip 11 to the circumferential main reinforcement creates a complete force transmission path for the arc-shaped steel strip, the upright steel strip, the circumferential main reinforcement, and the entire segment. This ensures that the longitudinal force borne by the arc-shaped steel strip is evenly distributed to the segment's reinforcing steel skeleton, rather than concentrated at the contact point between the arc-shaped steel strip and the concrete. This prevents localized cracking of the segment's concrete due to stress concentration and protects the structural integrity of the segment itself.

[0045] like Figure 4 As shown, a fixing steel plate 9 is installed in the pre-reserved hole 4 of the steel strip. The fixing steel plate 9 is used to fix the second end of the arc-shaped steel strip 1.

[0046] Specifically, the fixing steel plate 9 is an arc-shaped hollow steel section, and the outer contour of the fixing steel plate 9 fits the inner wall of the reserved hole 4 in the steel strip. A fixing steel plate through hole 10 is reserved on the fixing steel plate 9, which is connected to the steel strand through hole 6 on the arc-shaped steel strip 1, and the diameter of the fixing steel plate through hole 10 is larger than the diameter of the steel strand through hole 6.

[0047] During segment prefabrication, the fixing steel plate 9 is pre-installed within the pre-reserved hole 4 of the steel strip. The fixing steel plate 9 is an arc-shaped hollow steel section, and its outer contour fits tightly against the inner wall of the pre-reserved hole 4, forming an integrated structure of the fixing steel plate and the pre-reserved hole. This ensures that the fixing steel plate itself will not shift within the pre-reserved hole, providing stable support for the second end of the arc-shaped steel strip. During segment assembly, after the second end of the arc-shaped steel strip is inserted into the pre-reserved hole of the longitudinally adjacent segment, it will embed itself within the arc-shaped hollow structure of the fixing steel plate. The inner wall of the fixing steel plate forms a circumferential limit on the second end of the arc-shaped steel strip, preventing the arc-shaped steel strip from shifting in the circumferential or longitudinal direction. When the tunnel is subjected to uneven settlement, load, or longitudinal force generated by the tension of steel strands, the force borne by the arc-shaped steel strip will be transmitted to the fixed steel plate through the second end. Because the fixed steel plate is in close contact with the reserved tunnel wall of the steel strip, it can disperse and transmit the force to the segment body, thus avoiding damage to the segment concrete due to local force concentration at the second end of the arc-shaped steel strip.

[0048] The through hole 10 reserved on the fixed steel plate is connected to the through hole 6 reserved for the steel strand in the arc-shaped steel strip. The diameter of the through hole 10 is slightly larger than the diameter of the through hole 6. This ensures that the steel strand can pass smoothly through the fixed steel plate and the arc-shaped steel strip, and avoids jamming caused by the diameter deviation when the steel strand is installed.

[0049] like Figure 3 As shown, the reinforcement structure also includes anchoring components, which are used to fix the steel strands within the operating holes. The anchoring components are used to fix the steel strands after tensioning, achieving stable anchoring of the steel strands. The anchoring components are key components for maintaining the prestress of the steel strands and ensuring the long-term effectiveness of the reinforcement.

[0050] Specifically, the anchoring assembly includes a lock 7 and a washer 8. The lock 7 is locked to the steel strand 2, and the washer 8 is disposed between the lock 7 and the inner wall of the operating hole.

[0051] Lock 7 is the core component of the anchoring assembly that directly engages and locks with the steel strand. For example, lock 7 includes a mechanical engagement structure that can form a tight engagement with the surface of the steel strand, preventing the steel strand from loosening due to elastic rebound after tensioning. Gasket 8 is a component in the anchoring assembly that buffers and disperses pressure. It is generally made of metal, and its shape is adapted to the inner wall of the operating hole. It is placed between lock 7 and the inner wall of operating hole 5 to increase the contact area under stress and prevent lock 7 from causing localized pressure damage to the tunnel segment concrete.

[0052] Based on the above embodiments, the placement and width of the arc-shaped steel strip have a significant impact on the reinforcement effect. For example, the arc-shaped steel strip is disposed at both circumferential ends of the pipe segment. The position of the arc-shaped steel strip satisfies the following conditions: the ratio of its distance to the longitudinal edge of the pipe segment to the circumferential width of the pipe segment is a first preset value; the ratio of its distance to the surface of the pipe segment to the thickness of the pipe segment is a second preset value; and the ratio of the width of the arc-shaped steel strip to the circumferential width of the pipe segment satisfies a third preset value.

[0053] The two ends of the circumferential segment refer to the two sides closest to the segment along the circumferential direction (i.e., Figure 1 The location of the short side of the tunnel segment is a key area for the installation of the curved steel strip. The longitudinal edge of the tunnel segment refers to the edge of the segment along its longitudinal direction (i.e., the edge along the longitudinal direction). Figure 1 The long side of the tunnel segment). The circumferential width of the tunnel segment refers to the length dimension of the segment along the circumferential direction (i.e., the length of the tunnel segment). Figure 1 (Dimensions of the short side of the middle tube segment).

[0054] For example, the first preset value is 1 / 4, the second preset value is 1 / 4, and the third preset value is 1 / 16. That is, the distance from the curved steel strip to the longitudinal edge of the segment = the circumferential width of the segment × 1 / 4, and the distance from the curved steel strip to the surface of the segment = the thickness of the segment × 1 / 4. The surface of the segment includes the inner or outer surface. The specific distance from the curved steel strip to the outer or inner surface of the segment is adapted to the actual stress, so that construction personnel can determine the position of the curved steel strip in the thickness direction of the segment. The width of the curved steel strip = the circumferential width of the segment × 1 / 16. For example, the thickness of the curved steel strip is 2mm, ensuring that the stress requirements are met without affecting other structures of the segment.

[0055] By using the ratio of the first and second preset values ​​for positioning, the curved steel strip can be precisely positioned in the optimal stress area of ​​the tunnel segment, maximizing the transmission of longitudinal force and circumferential prestress. This avoids insufficient stress or localized stress concentration in the curved steel strip due to positioning deviations, ensuring that the reinforcement force effectively acts on the tunnel segment. The third preset value ensures that the width of the curved steel strip precisely matches the circumferential width of the tunnel segment. This guarantees sufficient longitudinal connection stiffness of the curved steel strip without excessive width that could encroach on the internal space of the tunnel segment, avoiding conflicts with other structures such as the steel strand channels, operating holes, and reinforcing steel cage.

[0056] This invention also provides a construction method for a bidirectional collaborative reinforcement structure for shield tunnel segments. The construction method of this embodiment is used to construct the bidirectional collaborative reinforcement structure for shield tunnel segments in any of the above embodiments. Figure 5 This is a flowchart of a construction method for a bidirectional collaborative reinforcement structure for shield tunnel segments provided in an embodiment of the present invention, as shown below. Figure 5 As shown, the specific steps of the construction method include:

[0057] S1. Process the arc-shaped steel strip, pre-reserve through holes for steel strands on the arc-shaped steel strip, and set an upright steel strip at the first end of the arc-shaped steel strip.

[0058] Based on the design drawing of the curved steel strip, the curvature, width, and length parameters of the curved steel strip are determined. The curved steel strip is then processed using relevant equipment, and through holes for steel strands are drilled at predetermined positions on the curved steel strip. After the curved steel strip is processed, rust prevention treatment is performed.

[0059] S2. Process the pipe segments, embed the first end of the arc-shaped steel strip into the pipe segment, weld and fix the upright steel strip to the circumferential main reinforcement of the pipe segment, and reserve steel strip reserved holes, operating holes and steel strand channels in the longitudinal adjacent pipe segments.

[0060] After welding the upright steel strip at the first end of the arc-shaped steel strip to the circumferential main reinforcement of the segment, according to the design drawings, mark the positions of the holes that match the second end of the arc-shaped steel strip on the reinforcing steel skeleton of the longitudinally adjacent segments, marking the reserved holes for the steel strip. On the reinforcing steel skeleton inside the segment, mark the positions of the steel strand outlets circumferentially around each segment, i.e., the operating holes, and mark the channel paths inside the segment connecting the operating holes, the through holes of the arc-shaped steel strip steel strands, and the through holes of adjacent arc-shaped steel strips, i.e., the steel strand channels. The reserved holes for the steel strip also include fixing steel plates with through holes for fixing the steel plates.

[0061] S3. Assemble the segments sequentially using a longitudinal staggered joint splicing method. Longitudinal staggered joints refer to the fact that the longitudinal joints of adjacent rings of segments do not overlap.

[0062] S4. After the tunnel segments are assembled, the steel strands are inserted into the steel strand channel through the operating holes in one of the tunnel segments containing two adjacent circumferential arc-shaped steel strips. After passing through the pre-reserved steel strand through-holes on the two adjacent circumferential arc-shaped steel strips, the strands exit through the operating holes in the other tunnel segment containing the two adjacent circumferential arc-shaped steel strips. Construction workers sequentially pass the steel strands through the operating holes, steel strand channels, fixing plate through-holes, and steel strand through-holes, thus connecting all adjacent circumferential tunnel segments in series.

[0063] S5. By tensioning adjacent steel strands through the operating holes, the segments are simultaneously tightened circumferentially and longitudinally to achieve bidirectional synergistic reinforcement. At the operating holes, shims are inserted into the steel strands, and then locking devices are installed. After the steel strands are tensioned to the prestress value, the locking devices are engaged and locked with the steel strands.

[0064] By using a connection method where one end of an arc-shaped steel strip is pre-embedded and the other end is inserted, adjacent longitudinal segments are directly rigidly connected, effectively limiting longitudinal misalignment and inter-ring expansion deformation. Steel strands are passed through the through-holes of adjacent circumferential arc-shaped steel strips to achieve circumferential series connection. Tensioning the steel strands through the operating holes generates circumferential pre-tensioning force on the segments, suppressing circumferential expansion or cracking caused by lateral pressure. Through longitudinal and circumferential synergistic reinforcement, the gaps between segments are effectively squeezed, resulting in high reliability. Simultaneously, the fixing steel plate can evenly transfer the force at the second end of the arc-shaped steel strip to the segment concrete, preventing localized compression of the steel strip that could cause cracking of the reserved hole walls. The fixing steel plate simultaneously serves the dual function of fixing the arc-shaped steel strip and guiding the steel strands. The through-holes in the fixing steel plate are connected to the through-holes in the arc-shaped steel strip, ensuring that the circumferential pre-tensioning force generated by the tensioning of the steel strands can be transferred to the arc-shaped steel strip through the fixing steel plate, thereby driving the longitudinal segments to synergistically compress, achieving a linkage effect between circumferential tensioning and longitudinal compression, which is beneficial for longitudinal and circumferential synergistic reinforcement.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of the present invention.

Claims

1. A bidirectional collaborative reinforcement structure for shield tunnel segments, wherein the segments are longitudinally staggered and spliced, characterized in that, The reinforcement structure includes: curved steel strip, steel strand, steel strand channel, reserved holes in the steel strip, and operating holes; The pre-reserved hole in the steel strip and the operating hole are provided inside the tube segment; The arc-shaped steel strip is fixedly connected to two longitudinally adjacent pipe segments. The first end of the arc-shaped steel strip is pre-embedded in one of the pipe segments, and the second end of the arc-shaped steel strip is inserted into the steel strip reserved hole in the other pipe segment. The first end of the arc-shaped steel strip is provided with an upright steel strip, which is welded and fixed to the circumferential main reinforcement of the pipe segment; The arc-shaped steel strip has a reserved through hole for steel strands, and the segment has a reserved channel for steel strands. The channel for steel strands is used to connect the operating hole and the through hole for steel strands in the same segment, as well as to connect the through holes for steel strands on two adjacent arc-shaped steel strips in the same circumferential direction. The steel strand enters the steel strand channel through the operating hole in one of the segments containing the two adjacent circumferential arc-shaped steel strips, passes through the steel strand through holes on the two adjacent circumferential arc-shaped steel strips in sequence, and then enters the operating hole in the other segment containing the two adjacent circumferential arc-shaped steel strips.

2. The shield tunnel segment bidirectional collaborative reinforcement structure according to claim 1, characterized in that, A fixing steel plate is installed inside the reserved hole of the steel strip, and the fixing steel plate is used to fix the second end of the arc-shaped steel strip.

3. The bidirectional collaborative reinforcement structure for shield tunnel segments according to claim 2, characterized in that, The fixing steel plate is an arc-shaped hollow steel section, and the outer contour of the fixing steel plate fits the inner wall of the reserved hole in the steel strip.

4. The bidirectional collaborative reinforcement structure for shield tunnel segments according to claim 3, characterized in that, The fixing steel plate has a pre-drilled through hole, which is connected to the through hole of the steel strand on the arc-shaped steel strip, and the diameter of the fixing steel plate through hole is larger than the diameter of the steel strand through hole.

5. The bidirectional collaborative reinforcement structure for shield tunnel segments according to claim 1, characterized in that, The reinforcement structure also includes an anchoring assembly for fixing the steel strand within the operating hole.

6. The bidirectional collaborative reinforcement structure for shield tunnel segments according to claim 5, characterized in that, The anchoring assembly includes a lock and a washer, the lock being locked to the steel strand, and the washer being disposed between the lock and the inner wall of the operating hole.

7. The bidirectional collaborative reinforcement structure for shield tunnel segments according to claim 1, characterized in that, The arc-shaped steel strip is disposed at both ends of the circumferential direction of the tube segment. The position of the arc-shaped steel strip satisfies the following conditions: the ratio of the distance to the longitudinal edge of the tube segment to the circumferential width of the tube segment is a first preset value, and the ratio of the distance to the surface of the tube segment to the thickness of the tube segment is a second preset value.

8. The bidirectional collaborative reinforcement structure for shield tunnel segments according to claim 1, characterized in that, The ratio of the width of the arc-shaped steel strip to the circumferential width of the tube segment satisfies a third preset value.

9. The construction method of the shield tunnel segment bidirectional collaborative reinforcement structure as described in any one of claims 1-8, characterized in that, The specific steps of the construction method include: S1. Process the arc-shaped steel strip, reserve through holes for steel strands on the arc-shaped steel strip, and set a standing steel strip at the first end of the arc-shaped steel strip; S2. Process the pipe segments, embed the first end of the arc-shaped steel strip into the pipe segment, weld and fix the upright steel strip to the circumferential main reinforcement of the pipe segment, and reserve steel strip reserved holes, operating holes and steel strand channels in the longitudinal adjacent pipe segments. S3. Assemble the segments sequentially using a longitudinal staggered splicing method; S4. After the segments are assembled, the steel strands are inserted into the steel strand channel through the operating hole in one of the segments where the two adjacent arc-shaped steel strips are located, and then through the steel strand through holes on the two adjacent arc-shaped steel strips in sequence, and then out through the operating hole in the other segment where the two adjacent arc-shaped steel strips are located. S5. By tensioning adjacent steel strands through the operating holes, the segments are simultaneously squeezed in the circumferential and longitudinal directions to achieve bidirectional synergistic reinforcement of the segments.

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