Overlapped structure for reinforcing shield tunnel and construction method thereof

Abstract

The invention discloses an overlapped structure for reinforcing a shield tunnel and a construction method thereof.The overlapped structure for reinforcing the shield tunnel comprises the shield tunnel, the shield tunnel is provided with a plurality of lining structures, each lining structure comprises a plurality of pipe pieces, and each pipe piece is provided with a hoisting hole and a first hand hole; a first hand hole bolt is arranged between the adjacent first hand holes of every two pipe pieces adjacent in the circumferential direction in a penetrating mode, and a first nut is installed between the adjacent first hand holes. The reinforcing structure comprises multiple aluminum alloy plates, ultra-high performance concrete and hoisting hole bolts, the multiple aluminum alloy plates are spliced in the circumferential direction of the duct piece, first extending parts are arranged on the outer surfaces of the aluminum alloy plates, and the first extending parts are embedded into the first hand holes and locked and fixed to the duct piece through first hand hole bolts and first nuts; the aluminum alloy plate is provided with a center hole, and the hoisting hole bolt penetrates through the center hole and is in threaded connection with the hoisting hole. And the ultra-high performance concrete is filled between the aluminum alloy plate and the duct piece. The method has the advantages of being good in reinforcing effect and convenient to construct.

Description

Technical Field

[0001] The present invention relates to the technical field of shield tunnel reinforcement, and in particular to a superimposed structure for reinforcing a shield tunnel and a construction method thereof. Background Art

[0002] As a vital form of underground transportation and infrastructure, subway shield tunnels play a fundamental role in supporting urban and regional economic development. However, due to unpredictable environmental fluctuations and potential accidents, as well as the structural characteristics of shield tunnel segments, tunnel lining structures (several segments spliced together in a ring) are inevitably subject to deformation, cracking, groundwater leakage, joint opening, and misalignment. These problems significantly reduce the overall bearing capacity and durability of the lining structure, posing a significant threat to the safe operation of the tunnel. Furthermore, the long length of subway lines, the heavy maintenance workload, and the limited window operation time require effective and rapid reinforcement within limited working time. Existing reinforcement technologies primarily rely on steel reinforcement and fiber-reinforced plastic (FRP) reinforcement, but both have limitations. Steel reinforcement is heavy, difficult to hoist and transport, and requires welding and numerous bolts for installation, making construction complex. Fiber-reinforced plastic (FRP) reinforcement has limited overall ductility and high flatness requirements for the lining, and offers minimal improvement in deformation stiffness. This results in complex construction and poor reinforcement effectiveness.

[0003] In view of this, there is an urgent need to develop a structure for reinforcing shield tunnels that has good reinforcement effect and is easy to construct. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a superimposed structure for reinforcing a shield tunnel, which has good reinforcement effect and is convenient to construct.

[0005] The present invention also proposes a construction method based on the composite structure of the reinforced shield tunnel.

[0006] The composite structure of a reinforced shield tunnel according to the first embodiment of the present invention includes: A shield tunnel is provided with a plurality of annular lining structures along its length, wherein the lining structures include a plurality of circumferentially spliced segments, each of which has a hoisting hole and a first hand hole, and a first hand hole bolt is passed through and a first nut is installed between adjacent first hand holes of two circumferentially adjacent segments to connect the two segments; A reinforcement structure is arranged corresponding to the lining structure, and the reinforcement structure includes an aluminum alloy plate, ultra-high performance concrete, and hanging hole bolts. The aluminum alloy plate is arc-shaped and is provided in plurality. The plurality of aluminum alloy plates are spliced along the circumference of the pipe segment. The outer surface of the aluminum alloy plate is provided with a first extension portion corresponding to the first hand hole. The first extension portion is embedded in the first hand hole and is locked and fixed to the pipe segment by the first hand hole bolt and the first nut; the aluminum alloy plate is provided with a center hole, the hanging hole bolt is passed through the center hole and is threadedly connected to the hanging hole to connect the aluminum alloy plate and the pipe segment; the ultra-high performance concrete is filled between the aluminum alloy plate and the pipe segment.

[0007] The superimposed structure for reinforcing a shield tunnel according to an embodiment of the present invention has at least the following beneficial effects: By installing aluminum alloy plates on the inner side of the segments and filling ultra-high performance concrete between the aluminum alloy plates and the segments, the lightweight and high-strength characteristics of the aluminum alloy material and the excellent mechanical properties and durability of the ultra-high performance concrete can be utilized to achieve synergistic reinforcement of the lining structure of the shield tunnel, which is not only convenient for construction but also has a good reinforcement effect. During the construction process, the aluminum alloy plates are light in weight and high in strength, which can facilitate transportation and lifting while ensuring the restoration and improvement of the mechanical properties of the segments. Filling with ultra-high performance concrete can enhance the interfacial bonding performance of the aluminum alloy plates and the segments. The two share the load, which can reduce the use of aluminum and reduce material costs. In addition, the installation of the aluminum alloy plates can utilize the existing first-hand holes and lifting holes on the segments for connection, without the need for additional bolt fixing or welding, avoiding the complicated drilling, welding and other processes in traditional reinforcement methods, making construction more convenient and efficient, and reducing the impact on the existing tunnel structure.

[0008] According to some embodiments of the present invention, the aluminum alloy plate is provided with a first notch corresponding to the first hand hole, the first extension portion is located at the edge of the first notch, and the inner surface of the aluminum alloy plate is connected to a sealing block at the first notch, and the sealing block covers the first notch.

[0009] According to some embodiments of the present invention, an embedded portion is provided on the outer surface of the aluminum alloy plate, and a gap is provided between the embedded portion and the tube sheet along the radial direction of the aluminum alloy plate.

[0010] According to some embodiments of the present invention, side blocks are respectively provided at both ends of the outer surface of the aluminum alloy plate along the length direction of the shield tunnel. The side blocks extend along the circumference of the aluminum alloy plate and abut against the inner surface of the tube segment.

[0011] According to some embodiments of the present invention, the reinforcement structure further comprises: A reinforcing rod group, wherein the reinforcing rod group corresponds to the aluminum alloy plate one by one and is located on the radially inward side of the aluminum alloy plate. The reinforcing rod group includes a plurality of connecting rods, and both ends of the connecting rods are respectively connected to the aluminum alloy plate.

[0012] According to some embodiments of the present invention, the aluminum alloy plate is provided with a first notch corresponding to the first hand hole, the first extension portion is located at the edge of the first notch, the inner surface of the aluminum alloy plate is connected with a sealing block at the first notch, and is connected with a center block at the center hole, the sealing block covers the first notch, the center block covers the center hole, and is provided with a hole position for the lifting hole bolt to pass through, the connecting rod corresponds one-to-one to the sealing block, and one end of the connecting rod is connected to the corresponding sealing block, and the other end is connected to the center block.

[0013] According to some embodiments of the present invention, along the circumference of the aluminum alloy plate, the aluminum alloy plate has a first end and a second end relative to each other, the aluminum alloy plate is provided with an L-shaped structure at the first end, and a splicing groove is formed by the L-shaped structure, the splicing groove is opened along the radially inward side of the aluminum alloy plate and along the circumferential outward side of the aluminum alloy plate, and the second end of the aluminum alloy plate is used to be embedded in the splicing groove of the circumferentially adjacent aluminum alloy plate and bonded to the adjacent aluminum alloy plate.

[0014] According to some embodiments of the present invention, the L-shaped structure contacts the inner surface of the tube segment and covers the joint between two circumferentially adjacent tube segments.

[0015] A construction method for reinforcing a superimposed structure of a shield tunnel according to a second embodiment of the present invention includes the following steps: S1. Cleaning and polishing the inner surface of the segment of the lining structure that needs to be reinforced; S2. Temporarily supporting the segment to be reinforced and the adjacent segments by means of hydraulic machinery, and then removing the first hand-hole bolts connected to the segment to be reinforced; wherein the hydraulic machinery comprises a supporting hydraulic rod, the supporting hydraulic rod being supported at the hanging hole of the segment to be reinforced, and the aluminum alloy plate being sleeved on the supporting hydraulic rod through the center hole; S3. Move the aluminum alloy plate along the supporting hydraulic rod to the inner side of the segment to be reinforced, align the first extension of the aluminum alloy plate with the corresponding first hand hole, and then replace the old first hand hole bolt with a new first hand hole bolt and reinstall it, so that the new first hand hole bolt passes through the first extension, the segment to be reinforced, and the segment adjacent to the segment to be reinforced, and then install the first nut to lock and secure it. S4. Dismantle the hydraulic mechanical equipment, then install the center block on the aluminum alloy plate, and then pass the hanging hole bolts through the center block and the center hole and threadedly connect with the hanging hole to connect the aluminum alloy plate and the pipe segment to be reinforced; S5. Repeat steps S2, S3, and S4 to sequentially install the aluminum alloy plates on other segments of the lining structure that need to be reinforced, and splice the aluminum alloy plates along the circumferential direction of the segments; S6. Installing the sealing blocks on each of the aluminum alloy plates, and installing the connecting rods between the sealing blocks and the central block; S7. Pour the ultra-high performance concrete slurry into the space formed between the aluminum alloy plate and the tube segment, so that the ultra-high performance concrete is in close contact with the aluminum alloy plate and the tube segment.

[0016] The construction method according to the embodiment of the present invention has at least the following beneficial effects: By utilizing the lightweight and high-strength characteristics of aluminum alloy materials and the excellent mechanical properties and durability of ultra-high performance concrete, the lining structure of the shield tunnel can be synergistically strengthened, which is not only convenient for construction but also has a good reinforcement effect. During the construction process, the aluminum alloy plate is light in weight and high in strength, which is convenient for transportation and hoisting while ensuring the restoration and improvement of the mechanical properties of the pipe segment. Filling with ultra-high performance concrete can enhance the interfacial bonding performance of the aluminum alloy plate and the pipe segment. The two carry the load together, which can reduce the amount of aluminum and reduce material costs. Secondly, the installation of the aluminum alloy plate utilizes the existing first-hand holes, second-hand holes, hoisting holes, etc. on the pipe segment for connection, without the need for additional bolts. The aluminum alloy plates are fixed or welded, avoiding the complicated drilling and welding processes in the traditional reinforcement method, making the construction more convenient and efficient; thirdly, the connecting rods are arranged on the inner side of the aluminum alloy plate to support the aluminum alloy plate from the inner side, thereby enhancing the coordination of internal forces and load transfer capabilities of the structure, improving the stability and bearing capacity of the aluminum alloy plate under compression and bending load conditions, and effectively curbing the problems of bulging, arch cracking and delamination of the aluminum alloy plate due to insufficient constraints or sudden changes in interface stress; fourthly, the aluminum alloy plates of the reinforced structure are circumferentially spliced using splicing grooves, so that the aluminum alloy plates are connected as a whole, and the aluminum alloy plates can cooperate in stress bearing, thereby improving the overall structural strength of the reinforced structure.

[0017] According to some embodiments of the present invention, along the circumference of the aluminum alloy plate, the aluminum alloy plate has a first end and a second end relative to each other, the aluminum alloy plate is provided with an L-shaped structure at the first end, and a splicing groove is formed by the L-shaped structure, and the splicing groove is opened along the radially inward side of the aluminum alloy plate and along the circumferential outward side of the aluminum alloy plate; in the step S5, the splicing of each aluminum alloy plate along the circumference of the tube segment includes the following steps: applying structural adhesive in the splicing groove of the aluminum alloy plate and at the second end, and two circumferentially adjacent aluminum alloy plates are embedded in the splicing groove through the second end for bonding.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which: Figure 1 is a schematic diagram of a superimposed structure of a reinforced shield tunnel according to an embodiment of the present invention; Figure 2 1 is an exploded schematic diagram of the reinforcement structure and the installation structure of the segments according to an embodiment of the present invention; Figure 3 Schematic diagram of the connection structure between the aluminum alloy plate and the tube segment according to an embodiment of the present invention; Figure 4 Schematic diagram of the connection structure between the lifting hole bolts and the pipe segment according to an embodiment of the present invention; Figure 5 1 is a schematic structural diagram of an aluminum alloy plate according to an embodiment of the present invention; Figure 6 Schematic diagram of the connection structure of the embedded part, ultra-high performance concrete and pipe segment according to an embodiment of the present invention; Figure 7 It is a schematic diagram of the connection structure of the connecting rod, the sealing block and the central block in an embodiment of the present invention.

[0020] Figure Number: Lining structure 100, segment 110, hoisting hole 111, first hand hole 112, first hand hole bolt 120, first nut 121; Reinforcement structure 200, aluminum alloy plate 210, first extension part 211, center hole 212, embedded part 213, first notch 214, splicing groove 215, second notch 216, second extension part 217, side block 218, ultra-high performance concrete 220, lifting hole bolts 230, sealing block 240, connecting rod 250, center block 260. DETAILED DESCRIPTION

[0021] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0022] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] In the description of the present invention, "a plurality" refers to more than two. If described, "a second" is used only to distinguish technical features and should not be understood as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features.

[0024] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0025] Due to unpredictable changes in the surrounding environment and potential accidents, as well as the structural characteristics of the shield tunnel segments themselves, the tunnel lining structure (several segments spliced together in a ring) is inevitably subject to deformation, cracking, groundwater leakage, joint opening, and misalignment. This significantly reduces the overall bearing capacity and durability of the lining structure, posing a significant threat to the safe operation of the tunnel. Therefore, when problems arise in the lining structure, it needs to be reinforced. Existing reinforcement technologies mainly include steel reinforcement and fiber-reinforced plastic (FRP) reinforcement, but both technologies have certain limitations. Steel reinforcement is heavy, difficult to hoist and transport, and requires welding and arranging a large number of bolts during installation, making construction complex. Fiber-reinforced plastic (FRP) reinforcement has limited overall ductility and high flatness requirements for the lining, and the deformation stiffness is not significantly improved. This not only makes construction difficult but also provides poor reinforcement results.

[0026] To this end, the present invention proposes a superimposed structure for reinforcing a shield tunnel, which can effectively improve the above-mentioned problems.

[0027] To facilitate understanding of this plan, the structure of the existing shield tunnel is first explained.

[0028] In the existing structure, that is, before reinforcement is performed, the shield tunnel is provided with several annular lining structures along its own length direction, and each lining structure is connected to form a whole. The lining structure includes several pipe segments spliced along the circumference of the shield tunnel. The pipe segments are arc-shaped and have lifting holes, first hand holes and second hand holes on the pipe segments. The lifting holes are threaded holes and are used when lifting the pipe segments. A first hand hole bolt is passed through the adjacent first hand holes of two circumferentially adjacent pipe segments, and a first nut is installed at both ends of the first hand hole bolt to connect the two circumferentially adjacent pipe segments. A second hand hole bolt is passed through the adjacent second hand holes of two adjacent pipe segments along the length direction of the shield tunnel, and a second nut is installed at both ends of the second hand hole bolt to connect the two adjacent pipe segments along the length direction of the shield tunnel.

[0029] The following describes a composite structure of a reinforced shield tunnel according to an embodiment of the first aspect of the present invention with reference to the accompanying drawings.

[0030] Reference Figures 1 to 7 As shown, a composite structure of a reinforced shield tunnel according to an embodiment of the present invention includes a shield tunnel and a reinforcement structure 200.

[0031] A shield tunnel is equipped with several annular lining structures 100 along its length. Each lining structure 100 is connected in sequence to form a whole. The lining structure 100 includes several segments 110 spliced along the circumference of the segment. The segments 110 are arc-shaped and have hanging holes 111 and first hand holes 112. First hand hole bolts 120 are inserted between the adjacent first hand holes 112 of two circumferentially adjacent segments 110, and first nuts 121 are installed to connect the two segments 110. Specifically, the ends of the first hand hole bolts 120 extend into the adjacent first hand holes 112 of the two adjacent segments 110 and are respectively installed with first nuts 121. In addition, the first nuts 121 can be used in conjunction with gaskets.

[0032] The reinforcement structure 200 is arranged corresponding to the lining structure 100 , that is, the lining structure 100 corresponds to the reinforcement structure 200 one by one; the reinforcement structure 200 includes an aluminum alloy plate 210 , ultra-high performance concrete 220 , and hanging hole bolts 230 .

[0033] The aluminum alloy plate 210 is arc-shaped and is provided in plurality. The plurality of aluminum alloy plates 210 are spliced along the circumference of the pipe segment 110, that is, the plurality of aluminum alloy plates 210 are connected as a whole and can bear force together as a whole to improve the bearing capacity; the outer surface of the aluminum alloy plate 210 is provided with a first extension portion 211 corresponding to the first hand hole 112, the first extension portion 211 is embedded in the first hand hole 112, and a hole position for the first hand hole bolt 120 to pass through is provided on the first extension portion 211, and is locked and fixed to the pipe segment 110 by the first hand hole bolt 120 and the first nut 121; the aluminum alloy plate 210 is also provided with a center hole 212 corresponding to the lifting hole 111, and the lifting hole bolt 230 is passed through the center hole 212 and is threadedly connected to the lifting hole 111 to connect the aluminum alloy plate 210 and the pipe segment 110; the ultra-high performance concrete 220 is filled between the aluminum alloy plate 210 and the pipe segment 110, and is in close contact with the aluminum alloy plate 210 and the pipe segment 110.

[0034] The composite structure of the reinforced shield tunnel of the embodiment of the present invention is to install an aluminum alloy plate 210 on the inner side of the tube segment 110 and fill the space between the aluminum alloy plate 210 and the tube segment 110 with ultra-high performance concrete 220, thereby utilizing the lightweight and high-strength characteristics of the aluminum alloy material and the excellent mechanical properties and durability of the ultra-high performance concrete 220 to achieve synergistic reinforcement of the lining structure 100 of the shield tunnel, which is not only convenient for construction but also has a good reinforcement effect. In the construction process, the aluminum alloy plate 210 is light in weight and high in strength, which is convenient for transportation and hoisting while ensuring the restoration and improvement of the mechanical properties of the tube segment 110, while the ultra-high performance concrete 220 is filled. 0 can enhance the interface bonding performance between the aluminum alloy plate 210 and the pipe segment 110, and the two bear the load together, which can reduce the amount of aluminum used and reduce material costs; in addition, the installation of the aluminum alloy plate 210 can utilize the existing first-hand holes 112 and lifting holes 111 on the pipe segment 110 for connection, without the need for additional bolts or welding, avoiding the complicated drilling, welding and other processes in traditional reinforcement methods, making construction more convenient and efficient, and at the same time reducing the impact on the existing shield tunnel structure; further, the aluminum alloy plates 210 are spliced into a whole, and the aluminum alloy plates 210 can cooperate in bearing force, thereby improving the overall structural strength of the reinforced structure 200.

[0035] It should be noted that, in some embodiments, only one aluminum alloy plate 210 is provided for each pipe segment 110 , and since a track is laid at the bottom of the lining structure 100 , the reinforcement operation is inconvenient, and therefore no aluminum alloy plate 210 is provided for reinforcement at the pipe segment 110 at the bottom position of the lining structure 100 .

[0036] In addition, if the length of the original first hand-hole bolts 120 on the shield tunnel lining structure 100 is not sufficient to allow the first nuts 121 to be installed after passing through two circumferentially adjacent segments 110 and the first extension 211, the first hand-hole bolts 120 need to be replaced when reinforcing the segments 110, with longer first hand-hole bolts 120 replacing the old first hand-hole bolts 120. Of course, if the length of the first hand-hole bolts 120 meets the above conditions, they do not need to be replaced, but the original first hand-hole bolts 120 should be checked for aging. If aging is found, they need to be replaced.

[0037] Reference Figure 2 、 Figure 3 and Figure 5 As shown, in some embodiments of the present invention, the aluminum alloy plate 210 is provided with a first notch 214 corresponding to the first hand hole 112, and the first extension portion 211 is located at the edge of the first notch 214. By providing the first notch 214, it is convenient for the operator to insert his hands or tools into the first hand hole 112 to disassemble and assemble the first hand hole bolt 120 and the first nut 121, thereby improving the convenience of operation; further, the inner surface of the aluminum alloy plate 210 is connected to a sealing block 240 at the first notch 214, and the sealing block 240 covers the first notch 214. Such a setting can reduce the stress concentration problem at the first notch 214 and improve the structural strength of the aluminum alloy plate 210.

[0038] Based on the above embodiments, it can be imagined that the sealing block 240 can be connected to the aluminum alloy plate 210 in various ways, such as bonding, welding, riveting, etc.; for example, in one specific embodiment, in order to facilitate disassembly and assembly, the sealing block 240 is connected to the aluminum alloy plate 210 by bolts (excluding nuts), and the bolts used for connection can be high-strength bolts to improve the connection strength.

[0039] Based on the above embodiments, it is conceivable that the first extension portion 211 may be configured to be plate-shaped and configured as an integral structure with the aluminum alloy plate 210 .

[0040] It is contemplated that in some embodiments, reference Figure 5 As shown, a second notch 216 can be provided on the aluminum alloy plate 210 corresponding to the second hand hole (not shown) of the tube segment 110, and a second extension portion 217 can be provided on the edge of the second notch 216 on the outer surface of the aluminum alloy plate 210. A hole position for a second hand hole bolt to pass through is provided on the second extension portion 217. During reinforcement, the second extension portion 217 is embedded in the second hand hole and is fastened to the tube segment 110 by the second hand hole bolt and the second nut. In this way, the existing structure of the tube segment 110 can be fully utilized to further improve the connection strength between the aluminum alloy plate 210 and the tube segment 110, thereby improving the reinforcement effect.

[0041] Similarly, if the length of the original second-hand hole bolt is not sufficient to allow the second nut to be installed after passing through two adjacent segments 110 and the second extension 217 along the length of the shield tunnel, the second-hand hole bolt needs to be replaced with a longer second-hand hole bolt. If the length of the second-hand hole bolt meets the above conditions, it is not necessary to replace it, but the original second-hand hole bolt should be checked for aging. If the original second-hand hole bolt is aged, it needs to be replaced.

[0042] Reference Figure 2 、 Figure 5 and Figure 6 As shown, in some embodiments of the present invention, an embedded portion 213 is provided on the outer surface of the aluminum alloy plate 210. Along the radial direction of the aluminum alloy plate 210, there is a gap between the embedded portion 213 and the pipe segment 110. Obviously, this gap is filled with ultra-high performance concrete 220. In this embodiment, by providing an embedded portion 213 protruding from the outer surface of the aluminum alloy plate 210 and leaving a gap between the embedded portion 213 and the pipe segment 110, the embedded portion 213 can be embedded in the ultra-high performance concrete 220, thereby increasing the contact area between the aluminum alloy plate 210 and the ultra-high performance concrete 220, which not only improves the bonding strength of the interface, but also enhances the uniformity of load transfer and reduces the problem of local stress concentration.

[0043] Based on the above embodiments, in some specific embodiments, multiple groups of embedded portions 213 can be provided, and the multiple groups of embedded portions 213 are evenly spaced along the circumference of the aluminum alloy plate 210. One group of embedded portions 213 includes multiple embedded portions 213 spaced along the length direction of the shield tunnel. The embedded portions 213 are configured in a strip shape and extend along the length direction of the shield tunnel. Obviously, the embedded portions 213 can be fixed to the outer surface of the aluminum alloy plate 210 by welding, and the two form an integrated structure to ensure the overall structural strength.

[0044] It should be noted that the multiple embedded portions 213 in the same group are arranged at intervals in order to leave more flow space for the ultra-high performance concrete 220 when pouring and filling the ultra-high performance concrete 220 during construction.

[0045] Reference Figure 1 、 Figure 2 and Figure 5As shown, in some embodiments of the present invention, side blocks 218 are respectively provided at both ends of the outer surface of the aluminum alloy plate 210 along the length direction of the shield tunnel. The side blocks 218 extend along the circumference of the aluminum alloy plate 210 and abut against the inner surface of the pipe segment 110. By providing the side blocks 218, on the one hand, the side blocks 218 can seal the gap between the side of the aluminum alloy plate 210 and the pipe segment 110, thereby preventing the ultra-high performance concrete 220 from flowing out from the side of the aluminum alloy plate 210 when pouring the ultra-high performance concrete 220, thereby reducing waste; on the other hand, through the abutment between the side blocks 218 and the pipe segment 110, a radial gap in the aluminum alloy plate 210 can be left between the embedded portion 213 and the pipe segment 110.

[0046] Based on the above embodiment, it can be imagined that the embedding portion 213 is located between the two side blocks 218 of the aluminum alloy plate 210 .

[0047] Reference Figure 1 、 Figure 2 and Figure 7 As shown, in some embodiments of the present invention, the reinforcement structure 200 further includes a reinforcing rod group. The reinforcing rod group corresponds one-to-one with the aluminum alloy plate 210, that is, one reinforcing rod group is provided for each aluminum alloy plate 210. The reinforcing rod group is located on the radially inward side of the aluminum alloy plate 210 and includes a plurality of connecting rods 250, each of which is connected to the aluminum alloy plate 210 at both ends.

[0048] By adopting the above-mentioned structural setting, the reinforcing rod group can be used to support the aluminum alloy plate 210 from the inner side of the aluminum alloy plate 210, thereby enhancing the internal force coordination and load transfer capabilities of the structure, improving the stability and bearing capacity of the aluminum alloy plate 210 under compression and bending load conditions, and effectively preventing the aluminum alloy plate 210 from causing bulging, arch cracking, and delamination due to insufficient constraints or sudden changes in interface stress.

[0049] Reference Figures 2 to 4 as well as Figure 7 As shown, in some embodiments of the present invention, the inner surface of the aluminum alloy plate 210 is connected to a center block 260 at the center hole 212. The center block 260 covers the center hole 212 and is provided with a hole for the hanging hole bolt 230 to pass through. The hanging hole bolt 230 passes through the center block 260, the center hole 212 and is threadedly connected to the hanging hole 111 to lock and fix the center block 260, the aluminum alloy plate 210, and the pipe segment 110 together; in addition, the connecting rod 250 corresponds one-to-one to the sealing block 240, one end of the connecting rod 250 is connected to the corresponding sealing block 240, and the other end is connected to the center block 260, thereby connecting the connecting rod 250 to the aluminum alloy plate 210.

[0050] Obviously, the sealing block 240 and the center block 260 can provide installation positions for both ends of the connecting rod 250 respectively. At the same time, the sealing block 240 can reduce the stress concentration at the first notch 214, and the center block 260 can reduce the stress concentration at the center hole 212, thereby improving the overall structural strength.

[0051] Based on the above embodiment, it can be imagined that grooves for embedding the ends of the connecting rod 250 can be provided on the central block 260 and the sealing block 240 to facilitate positioning and installation of the connecting rod 250. The two ends of the connecting rod 250 can be connected to the central block 260 and the sealing block 240 respectively by bolts (without nuts) to facilitate disassembly and assembly; high-strength bolts can be used as the bolts used for connection to improve the connection strength.

[0052] In addition, the center block 260 can be connected to the aluminum alloy plate 210 by bolts (without nuts) to facilitate disassembly and assembly; the connecting bolts can be high-strength bolts to improve the connection strength.

[0053] In this embodiment, the tube segment 110 has four first hand holes 112 , so four first notches 214 , four sealing blocks 240 , and four connecting rods 250 are provided on one aluminum alloy plate 210 .

[0054] Reference Figure 2 、 Figure 3 and Figure 5 As shown, in some embodiments of the present invention, along the circumference of the aluminum alloy plate 210, the aluminum alloy plate 210 has a first end and a second end relative to each other, the aluminum alloy plate 210 is provided with an L-shaped structure at the first end, and the aluminum alloy plate 210 forms a splicing groove 215 through the L-shaped structure, the splicing groove 215 is opened along the radially inward side of the aluminum alloy plate 210 and along the circumferential outward side of the aluminum alloy plate 210, and the second end of the aluminum alloy plate 210 is used to be embedded in the splicing groove 215 of the aluminum alloy plate 210 adjacent to its circumference and bonded to the adjacent aluminum alloy plate 210.

[0055] By adopting the above-mentioned structural setting, the aluminum alloy plates 210 used for reinforcement can be spliced into a whole, so that the aluminum alloy plates 210 can bear the force synergistically, thereby improving the overall structural strength of the reinforcement structure 200; at the same time, the setting of the splicing groove 215, on the one hand, can make the connection between the two circumferentially adjacent aluminum alloy plates 210 tighter, and on the other hand, can also play a role in auxiliary positioning during splicing.

[0056] In a further embodiment, referring to Figure 3 As shown, the L-shaped structure contacts the inner surface of the pipe segment 110 and covers the joints of two circumferentially adjacent pipe segments 110, thereby limiting the misalignment and opening of the joints of the pipe segments 110, while enhancing the waterproof performance of the joints of the pipe segments 110 and reducing the risk of water seepage.

[0057] It is conceivable that, in order to improve the structural strength, the aluminum alloy plate 210 , the connecting rod 250 , the central block 260 and the sealing block 240 may be made of 7XXX series super-hard aluminum alloy.

[0058] The present invention further provides a construction method for a reinforced shield tunnel composite structure based on the first embodiment, the construction method comprising the following steps: S1. Clean and polish the inner surface of the segments 110 in the lining structure 100 that need to be reinforced. It should be noted that, in the lining structure 100, except for the segments 110 with rails laid on the bottom, all other segments 110 need to be reinforced. The specific operation may be: cleaning the inner surface of the tube segment 110 by a high-pressure water gun, and mechanically grinding it by a grinding device to improve the surface roughness; S2. The outermost segment 110 of the segment 110 to be reinforced is used as the segment 110 to be reinforced in the first reinforcement operation, and the segment 110 to be reinforced and the adjacent segments 110 are temporarily supported by hydraulic mechanical equipment to avoid dislocation and deformation of the segments 110 during subsequent operations; wherein the hydraulic mechanical equipment has a supporting hydraulic rod (not shown), which is supported at the lifting hole 111 of the segment 110 to be reinforced, while the segments 110 adjacent to the segment 110 to be reinforced only need to support the edges and corners; in addition, before the supporting hydraulic rod supports the segment 110 to be reinforced, the aluminum alloy plate 210 used for reinforcing the segment 110 to be reinforced is put on the supporting hydraulic rod through the center hole 212; after the temporary support is completed, the first hand-hole bolts 120 connected to the segment 110 to be reinforced are removed (the first nuts 121 are removed together); Obviously, when the second extension portion 217 is provided on the aluminum alloy plate 210 , in step S2 , it is also necessary to remove the second hand-hole bolts and the corresponding second nuts connected to the pipe segment 110 to be reinforced.

[0059] S3. Spray an interfacial activator or primer on the contact interface between the tube segment 110 and the aluminum alloy plate 210 to improve the bonding strength. After drying, move the aluminum alloy plate 210 along the top support hydraulic rod to the inner side of the tube segment 110 to be reinforced (the aluminum alloy plate 210 can be pushed to move by a power device such as a push rod device), align the first extension portion 211 of the aluminum alloy plate 210 with and insert it into the corresponding first hand hole 112, and make the side block 218 butt against the inner surface of the tube segment 110; then use the new first hand hole The bolt 120 replaces the old first hand-hole bolt 120 and is reinstalled so that the new first hand-hole bolt 120 passes through the first extension portion 211, the segment 110 to be reinforced, and the segment 110 circumferentially adjacent to the segment 110 to be reinforced. The first nut 121 is then installed to tighten and secure the new first hand-hole bolt 120. The new first hand-hole bolt 120 is longer than the old first hand-hole bolt 120 to ensure that the first hand-hole bolt 120 can pass through the first extension portion 211 and be installed with the first nut 121. Obviously, when the second notch 216 and the second extension 217 are provided on the aluminum alloy plate 210, in step S3, it is necessary to replace the old second hand-hole bolt with a new second hand-hole bolt and reinstall it, so that the new second hand-hole bolt passes through the second extension 217, the segment 110 to be reinforced, and the segment 110 adjacent to the segment 110 to be reinforced in the axial direction (i.e., the length direction of the shield tunnel), and then install the second nut to lock and secure it. The new second hand-hole bolt is longer than the old second hand-hole bolt to ensure that the second hand-hole bolt can pass through the second extension 217 and be installed with the second nut. S4. Dismantle the hydraulic machinery and equipment, then install the center block 260 on the aluminum alloy plate 210. Then, pass the hanging hole bolts 230 through the reserved holes on the center block 260 and the center hole 212, and thread them into the hanging holes 111 to connect the aluminum alloy plate 210, the center block 260, and the pipe segment 110 to be reinforced. S5. Repeat steps S2, S3, and S4 to sequentially install aluminum alloy plates 210 on other segments 110 of the lining structure 100 that need to be reinforced along the circumferential direction of the segment, and splice the aluminum alloy plates 210 along the circumferential direction of the segment; The specific operation of splicing the aluminum alloy plates 210 along the circumferential direction of the tube segment may be as follows: structural adhesive is applied to the splicing groove 215 at the first end and the second end of each aluminum alloy plate 210, and two circumferentially adjacent aluminum alloy plates 210 are bonded together by inserting the second ends into the splicing groove 215; in addition, the contact area between the L-shaped structure of the aluminum alloy plate 210 and the joint of the tube segment 110 is also bonded with structural adhesive; S6. Install a sealing block 240 on each aluminum alloy plate 210 , and install a connecting rod 250 between the sealing block 240 and the central block 260 ; S7. After all aluminum alloy plates 210 are installed, slurry of ultra-high performance concrete 220 is poured into the spaces formed between the aluminum alloy plates 210 and the segments 110, so that the ultra-high performance concrete 220 is in close contact with the aluminum alloy plates 210 and the segments 110. The aluminum alloy plates 210 are provided with pouring holes and exhaust holes extending radially therethrough. The pouring holes are used for pouring the slurry of ultra-high performance concrete 220, and the exhaust holes are used for exhausting air. The specific operation may be: setting a pouring nozzle at the pouring hole, and then using a hose to pour the slurry of ultra-high performance concrete 220 into the space between the aluminum alloy plate 210 and the pipe segment 110 from the pouring nozzle at the pouring hole. During the pouring, the aluminum alloy plate 210 may also be vibrated to eliminate bubbles.

[0060] It is conceivable that before pouring, corresponding sealing measures can be adopted to prevent the ultra-high performance concrete 220 from entering the first hand hole 112 and the second hand hole during pouring. Of course, sealing is not required. If maintenance is necessary later, the ultra-high performance concrete 220 that affects the operation can be knocked out.

[0061] The above construction method has at least the following advantages: First, the lightweight and high-strength properties of aluminum alloy and the excellent mechanical properties and durability of ultra-high performance concrete 220 can be utilized to achieve synergistic reinforcement of the shield tunnel lining structure 100, which not only facilitates construction but also has a good reinforcement effect. During the construction process, the aluminum alloy plate 210 is lightweight and high-strength, which ensures that the mechanical properties of the pipe segment 110 are restored and improved while also being easy to transport and hoist. By sleeved on the top support hydraulic rod, the aluminum alloy plate 210 and the pipe segment 110 can be easily aligned and connected. Filling with ultra-high performance concrete 220 can enhance the interfacial bonding performance of the aluminum alloy plate 210 and the pipe segment 110. The two share the load, which can reduce the amount of aluminum used and reduce material costs. Secondly, the aluminum alloy plate 210 is installed by connecting the existing first-hand holes 112, second-hand holes, and lifting holes 111 on the tube segment 110, without the need for additional bolts or welding, thus avoiding the complex drilling and welding processes in traditional reinforcement methods, making construction more convenient and efficient. Third, the connecting rods 250 are arranged on the inner side of the aluminum alloy plate 210 to support the aluminum alloy plate 210 from the inner side, thereby enhancing the coordination of internal forces and load transfer capabilities of the structure, improving the stability and bearing capacity of the aluminum alloy plate 210 under compression and bending load conditions, and effectively preventing problems such as bulging, arch cracking, and delamination of the aluminum alloy plate 210 caused by insufficient constraints or sudden changes in interface stress. Fourthly, the aluminum alloy plates 210 of the reinforcement structure 200 are circumferentially spliced using the splicing grooves 215 so that the aluminum alloy plates 210 are connected as a whole. The aluminum alloy plates 210 can bear forces in coordination, thereby improving the overall structural strength of the reinforcement structure 200 .

[0062] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine different embodiments or examples described in this specification.

[0063] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the scope of the present invention.

Claims

1. A superimposed structure for reinforcing a shield tunnel, characterized in that: include: A shield tunnel is provided with a plurality of annular lining structures along its length, wherein the lining structures include a plurality of circumferentially spliced segments, each of which has a hoisting hole and a first hand hole, and a first hand hole bolt is passed through and a first nut is installed between adjacent first hand holes of two circumferentially adjacent segments to connect the two segments; A reinforcement structure is arranged corresponding to the lining structure, and the reinforcement structure includes an aluminum alloy plate, ultra-high performance concrete, and hanging hole bolts. The aluminum alloy plate is arc-shaped and is provided in plurality. The plurality of aluminum alloy plates are spliced along the circumference of the pipe segment. The outer surface of the aluminum alloy plate is provided with a first extension portion corresponding to the first hand hole. The first extension portion is embedded in the first hand hole and is locked and fixed to the pipe segment by the first hand hole bolt and the first nut; the aluminum alloy plate is provided with a center hole, the hanging hole bolt is passed through the center hole and is threadedly connected to the hanging hole to connect the aluminum alloy plate and the pipe segment; the ultra-high performance concrete is filled between the aluminum alloy plate and the pipe segment.

2. The superimposed structure for reinforcing a shield tunnel according to claim 1, characterized in that: The aluminum alloy plate is provided with a first notch corresponding to the first hand hole, the first extension portion is located at the edge of the first notch, and a sealing block is connected to the inner surface of the aluminum alloy plate at the first notch, and the sealing block covers the first notch.

3. The superimposed structure for reinforcing a shield tunnel according to claim 1, characterized in that: An embedded portion is provided on the outer surface of the aluminum alloy plate, and a gap is provided between the embedded portion and the tube sheet along the radial direction of the aluminum alloy plate.

4. The superimposed structure for reinforcing a shield tunnel according to claim 3, characterized in that: Side blocks are respectively provided at both ends of the outer surface of the aluminum alloy plate along the length direction of the shield tunnel. The side blocks extend along the circumference of the aluminum alloy plate and abut against the inner surface of the tube segment.

5. The superimposed structure for reinforcing a shield tunnel according to claim 1, characterized in that: The reinforcement structure further comprises: A reinforcing rod group, wherein the reinforcing rod group corresponds to the aluminum alloy plate one by one and is located on the radially inward side of the aluminum alloy plate. The reinforcing rod group includes a plurality of connecting rods, and both ends of the connecting rods are respectively connected to the aluminum alloy plate.

6. The superimposed structure for reinforcing a shield tunnel according to claim 5, characterized in that: The aluminum alloy plate is provided with a first notch corresponding to the first hand hole, and the first extension portion is located at the edge of the first notch. The inner surface of the aluminum alloy plate is connected with a sealing block at the first notch and a center block at the center hole. The sealing block covers the first notch, and the center block covers the center hole and is provided with a hole for the lifting hole bolt to pass through. The connecting rod corresponds to the sealing block one by one, and one end of the connecting rod is connected to the corresponding sealing block, and the other end is connected to the center block.

7. The superimposed structure for reinforcing a shield tunnel according to claim 1, characterized in that: Along the circumference of the aluminum alloy plate, the aluminum alloy plate has a first end and a second end relative to each other. The aluminum alloy plate is provided with an L-shaped structure at the first end, and a splicing groove is formed by the L-shaped structure. The splicing groove is open along the radially inward side of the aluminum alloy plate and along the circumferentially outward side of the aluminum alloy plate. The second end of the aluminum alloy plate is used to be embedded in the splicing groove of the circumferentially adjacent aluminum alloy plate and bonded to the adjacent aluminum alloy plate.

8. The superimposed structure for reinforcing a shield tunnel according to claim 7, characterized in that: The L-shaped structure contacts the inner surface of the tube segment and covers the joint between two circumferentially adjacent tube segments.

9. A construction method for a superimposed structure of a reinforced shield tunnel according to claim 6, characterized in that: The steps include: S1. Cleaning and polishing the inner surface of the segment of the lining structure that needs to be reinforced; S2. Temporarily supporting the segment to be reinforced and the adjacent segments by means of hydraulic machinery, and then removing the first hand-hole bolts connected to the segment to be reinforced; wherein the hydraulic machinery comprises a supporting hydraulic rod, the supporting hydraulic rod being supported at the hanging hole of the segment to be reinforced, and the aluminum alloy plate being sleeved on the supporting hydraulic rod through the center hole; S3. Move the aluminum alloy plate along the supporting hydraulic rod to the inner side of the segment to be reinforced, align the first extension of the aluminum alloy plate with the corresponding first hand hole, and then replace the old first hand hole bolt with a new first hand hole bolt and reinstall it, so that the new first hand hole bolt passes through the first extension, the segment to be reinforced, and the segment adjacent to the segment to be reinforced, and then install the first nut to lock and secure it. S4. Dismantle the hydraulic mechanical equipment, then install the center block on the aluminum alloy plate, and then pass the hanging hole bolts through the center block and the center hole and threadedly connect with the hanging hole to connect the aluminum alloy plate and the pipe segment to be reinforced; S5. Repeat steps S2, S3, and S4 to sequentially install the aluminum alloy plates on other segments of the lining structure that need to be reinforced, and splice the aluminum alloy plates along the circumferential direction of the segments; S6. Installing the sealing blocks on each of the aluminum alloy plates, and installing the connecting rods between the sealing blocks and the central block; S7. Pour the ultra-high performance concrete slurry into the space formed between the aluminum alloy plate and the tube segment, so that the ultra-high performance concrete is in close contact with the aluminum alloy plate and the tube segment.

10. The construction method according to claim 9, characterized in that: Along the circumference of the aluminum alloy plate, the aluminum alloy plate has a first end and a second end relative to each other, the aluminum alloy plate is provided with an L-shaped structure at the first end, and a splicing groove is formed by the L-shaped structure, and the splicing groove is opened along the radially inward side of the aluminum alloy plate and along the circumferential outward side of the aluminum alloy plate; in the step S5, the splicing of each aluminum alloy plate along the circumference of the tube segment includes the following steps: applying structural adhesive in the splicing groove of the aluminum alloy plate and at the second end, and two circumferentially adjacent aluminum alloy plates are embedded in the splicing groove through the second end for bonding.

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