Large-diameter shield tunnel full-precast rapid assembly internal structure and construction method

Abstract

The application provides a large-diameter shield tunnel full-precast rapid assembly internal structure and a construction method, the internal structure comprising a prefabricated middle box culvert, prefabricated side box culverts and a connecting steel plate; the middle box culvert is arranged in the middle of the large-diameter shield tunnel, the middle box culvert is a frame structure similar to a Chinese character, the side box culverts are C-shaped opening structures, the openings of the two side box culverts face each other and are arranged on the two lateral end sides of the middle box culvert respectively; the longitudinal width of the middle box culvert and the side box culverts is adapted to the ring width of the tunnel lining segment; the two lateral end top portions of the middle box culvert are respectively pre-buried with first angle steels, the top connecting end of the side box culvert is pre-buried with a second angle steel, and the connecting steel plate is welded on the top of the first angle steel and the second angle steel; the bottom connecting end of the side box culvert is dovetail connected to the bottom of the lateral end side of the middle box culvert; through the above technical scheme, the precision and efficiency of the prefabricated assembly are improved, and higher economic efficiency is achieved.

Description

Technical Field

[0001] This invention belongs to the field of underground tunnel engineering technology, specifically relating to a fully prefabricated and rapidly assembled internal structure and construction method for a large-diameter shield tunnel. Background Technology

[0002] Shield tunneling is a fully mechanized construction method within the cut-and-cover method of underground excavation. Due to its advantages such as minimal impact on the surrounding environment, high degree of mechanization, and short construction period, it has been widely used in underground engineering construction. In recent years, with the continuous development of urbanization and the demands of high-quality development, the construction environment for underground engineering has become increasingly stringent. To reduce the impact on the surrounding environment, minimize demolition, avoid constructing high-risk connecting passages, and conserve underground space, large-diameter shield tunneling technology is often used to excavate underground tunnels in urban core areas or areas crossing rivers and seas. To fully utilize the internal space of large-diameter shield tunnels, the internal structure of the tunnel needs to be constructed in layers. There are three methods for the bottom construction of large-diameter shield tunnels: integral cast-in-place, a combination of partial prefabrication and cast-in-place, and integral prefabrication. Among these, the integral cast-in-place method is gradually being phased out by the market due to its low degree of mechanization and the difficulty in construction organization and quality control. While the combination of partial prefabrication and cast-in-place has improved construction technology and efficiency to some extent, it still involves a large amount of on-site wet work, and its construction efficiency needs further improvement. The overall prefabrication method has significant advantages in terms of cost saving, efficient construction and management. It can greatly shorten the construction period and reduce environmental pollution at the construction site. At the same time, component prefabrication can effectively solve the quality defects of cast-in-place process and has broad prospects for bottom construction in large-diameter shield tunnels.

[0003] Existing prefabrication methods include two categories: integral installation and modular assembly. If the integral installation method is used, the prefabricated components need to be transported into the shield tunnel. Due to the large weight and volume of the prefabricated components, this type of prefabrication method increases the difficulty of transportation and hoisting. While modular assembly can overcome the shortcomings of integral installation, the connection nodes between components in existing modular assembly structures are complex and the structural strength is relatively poor. A large number of bolts are also required to connect the components, resulting in high construction and quality control difficulties, low efficiency, poor economic performance, and failure to fully utilize the advantages of integral prefabrication technology. Summary of the Invention

[0004] This invention provides a fully prefabricated and rapidly assembled internal structure and construction method for large-diameter shield tunnels, which solves the problems existing in the prior art.

[0005] Firstly, to achieve the above objectives, the present invention provides a fully prefabricated and rapidly assembled internal structure for a large-diameter shield tunnel, located inside the large-diameter shield tunnel, comprising a prefabricated central box culvert, prefabricated side box culverts, and connecting steel plates; the central box culvert is located in the middle of the large-diameter shield tunnel, and the central box culvert is a U-shaped frame structure, while the side box culverts are C-shaped opening structures, with the openings of the two side box culverts facing each other and respectively located on the two transverse end sides of the central box culvert; the longitudinal width of the central box culvert and the side box culverts is adapted to the circumferential width of the tunnel lining segments;

[0006] The top of the two transverse ends of the central box culvert is pre-embedded with first angle steel, and the top connecting end of the side box culvert is pre-embedded with second angle steel. The connecting steel plate is welded to the top of the first and second angle steel. The bottom connecting end of the side box culvert is mortised and tenoned to the bottom of the transverse side of the central box culvert.

[0007] Through the above technical solution, the internal structure of the present invention is a fully prefabricated assembly structure. The top connection between the central box culvert and the side box culvert is connected by pre-embedded angle steel and welded steel plate, while the bottom connection between the central box culvert and the side box culvert is connected by tongue and groove to limit the displacement between the prefabricated structures. This ensures the overall stress resistance of the prefabricated structure and eliminates the need for bolt connection structures commonly used in the prior art. The assembly process is simple, which can improve the accuracy and efficiency of prefabrication and assembly, and is more economical.

[0008] Preferably, it also includes quick connectors. The top of the longitudinal side of the middle box culvert and the side box culvert are pre-drilled with multiple connection holes for the quick connectors to be pressed longitudinally. The middle box culvert is pressed to the longitudinally adjacent middle box culvert through the quick connectors, and the side box culvert is pressed to the longitudinally adjacent side box culvert through the quick connectors.

[0009] Preferably, the quick connector includes a pre-embedded sleeve and a connecting rod. The pre-embedded sleeve includes a hollow cylindrical part and a hollow frustum part. The hollow cylindrical part and the hollow frustum part are concentric and integrally formed. The hollow cylindrical part is fastened to the inner wall of the connecting hole. The end of the hollow frustum part with a larger diameter is away from the hollow cylindrical part. Both ends of the connecting rod are provided with toothed parts. The inner wall of the hollow cylindrical part is provided with toothed grooves for the toothed parts to be pressed. Both ends of the connecting rod are respectively pressed into the longitudinally adjacent connecting holes.

[0010] Preferably, the central box culvert includes a load-bearing section, a vertical support section, and a bottom arc section; the bottom arc section is located on the inner bottom of the large-diameter shield tunnel, and the bottom arc section is concentric with the large-diameter shield tunnel; the two vertical support sections are fixedly connected to the two ends of the bottom arc section respectively; and the two ends of the load-bearing section are fixedly connected to the tops of the two vertical support sections respectively.

[0011] Preferably, the side box culvert includes a horizontal section and an arc-shaped section. The arc-shaped section is concentric with the large-diameter shield tunnel and is located on the inner bottom of the large-diameter shield tunnel. The bottom end of the arc-shaped section is tenoned and connected to the bottom end of the vertical support section. One end of the horizontal section is fixedly connected to the top end of the arc-shaped section, and the other end is fixedly connected to the transverse end of the bearing section.

[0012] Preferably, the outer sides of the two vertical support parts are provided with brackets, the top surface of the brackets is provided with nitrile cork rubber pads, and the bottom side of the end of the horizontal part overlaps the top surface of the nitrile cork rubber pads.

[0013] Preferably, the bottom arc portion and the arc-shaped portion are provided with multiple grouting holes.

[0014] Preferably, the bottom sides of the central box culvert and the side box culverts are provided with multiple protrusions, and the central box culvert and the side box culverts are connected to the inner lining of the large-diameter shield tunnel through the multiple protrusions; a grouting layer is provided between the bottom sides of the central box culvert and the side box culverts and the inner lining of the large-diameter shield tunnel.

[0015] Preferably, the side box culvert is fixedly connected to the inner lining of the large-diameter shield tunnel by rebar installation and pouring concrete.

[0016] Secondly, to achieve the above objectives, the present invention provides a construction method for a fully prefabricated and rapidly assembled internal structure of a large-diameter shield tunnel, used to construct the aforementioned fully prefabricated and rapidly assembled internal structure of a large-diameter shield tunnel. The method of the present invention includes:

[0017] S1: Precast central box culverts and side box culverts adapted to the size, shape and thickness of the tunnel lining segments;

[0018] S2: After the tunnel lining segments are assembled, the middle box culvert is installed to the preset position using the matching assembly device, and multiple bosses are used to level the middle box culvert.

[0019] S3: Use quick connectors to press together two longitudinally adjacent and aligned middle box culverts;

[0020] S4: Adhere nitrile cork rubber pads to the top surface of the corbels of each central box culvert;

[0021] S5: After the longitudinal assembly of multiple middle box culverts is completed, the bottom end of the side box culvert is mortised and tenoned to the bottom end of the middle box culvert. Then, the second angle steel pre-embedded at the top connection end of the side box culvert is welded to the first angle steel at the top of the transverse end of the middle box culvert using connecting steel plates to form a temporary box culvert as a whole.

[0022] S6: Grouting is performed on the gap between the bottom arc surface of the temporary box culvert and the tunnel lining segments to form a grouting layer;

[0023] S7: Rebar is installed inside the tunnel lining segments near the end of the side box culvert, and the installed rebar is connected to the rebar connector pre-embedded in the side box culvert to form the whole box culvert;

[0024] S8: Tie steel cages on both sides of the box culvert and pour concrete.

[0025] The present invention has at least the following advantages:

[0026] 1) Compared with the prior art, the internal structure of the present invention is a fully prefabricated assembly structure. The top connection between the middle box culvert and the side box culvert is connected by pre-embedded angle steel + welded steel plate, while the bottom connection between the middle box culvert and the side box culvert is connected by tongue and groove to limit the displacement between the prefabricated structures. While ensuring the overall stress of the prefabricated structure, it can also eliminate the bolt connection structure commonly used in the prior art. The assembly process is simple, which can improve the accuracy and efficiency of prefabrication and assembly, and is more economical.

[0027] 2) Compared with existing technologies, the longitudinal connecting parts of precast box culverts adopt quick-connecting parts. The quick-connecting parts have the characteristics of high strength and high stability, which can replace the existing bolt connections, thereby eliminating the bolt tightening process, realizing the rapid assembly of the internal structure of the precast tunnel, and shortening the construction cycle.

[0028] 3) Compared with the prior art, the central box culvert and the side box culvert of the present invention are both produced in the factory, which can strictly control the materials and quality standards, ensure the consistency of the size and performance of the prefabricated box culvert, improve the overall construction quality of the tunnel internal structure, and reduce construction safety risks. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the internal structure of the large-diameter shield tunnel fully prefabricated and rapidly assembled structure in Embodiment 1 of the present invention;

[0031] Figure 2 for Figure 1 Enlarged view of section A;

[0032] Figure 3 for Figure 1 Enlarged view of section B;

[0033] Figure 4 This is a schematic diagram of the middle box culvert of Embodiment 1 of the present invention;

[0034] Figure 5 This is a schematic diagram of the side box culvert in Embodiment 1 of the present invention;

[0035] Figure 6 This is a schematic diagram showing the connection between the side box culvert and the inner lining of the large-diameter shield tunnel in Embodiment 1 of the present invention;

[0036] Figure 7 This is a schematic diagram showing the connection between two longitudinally adjacent middle box culverts in Embodiment 1 of the present invention;

[0037] Figure 8 This is a vertical displacement cloud diagram of the internal structure of a large-diameter shield tunnel with fully prefabricated rapid assembly in Embodiment 1 of the present invention under bidirectional train conditions.

[0038] Figure 9 This is a vertical displacement cloud diagram of the internal structure of the large-diameter shield tunnel fully prefabricated and rapidly assembled in Embodiment 1 of the present invention under the load condition of the train on the left.

[0039] Figure 10 This is a flowchart illustrating the construction method for the fully prefabricated and rapidly assembled internal structure of a large-diameter shield tunnel in Embodiment 2 of the present invention.

[0040] Figure 11 This is a construction effect diagram after step S2 of the construction method for the fully prefabricated and rapidly assembled internal structure of a large-diameter shield tunnel in Embodiment 2 of the present invention is executed;

[0041] Figure 12 This is a construction effect diagram of the construction method for the fully prefabricated and rapidly assembled internal structure of a large-diameter shield tunnel in Embodiment 2 of the present invention, in which the side box culverts are connected to the middle box culverts by mortise and tenon joints.

[0042] Figure 13 This is a construction effect diagram after step S5 of the construction method for the fully prefabricated and rapidly assembled internal structure of a large-diameter shield tunnel in Embodiment 2 of the present invention is executed;

[0043] Figure 14 This is a final construction effect diagram of the construction method for the fully prefabricated and rapidly assembled internal structure of a large-diameter shield tunnel in Embodiment 2 of the present invention.

[0044] Reference numerals: 100, large-diameter shield tunnel; 1, central box culvert; 11, load-bearing section; 12, vertical support section; 121, corbel; 13, bottom arc section; 2, side box culvert; 21, horizontal section; 22, arc-shaped section; 3, connecting steel plate; 4, first angle steel; 5, second angle steel; 6, quick connector; 61, embedded sleeve; 62, connecting rod; 7, connecting hole; 8, grouting hole; 9, boss. Detailed Implementation

[0045] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] This embodiment discloses a fully prefabricated rapid assembly internal structure and construction method for large-diameter shield tunnels, which is used to solve the problems existing in the prior art.

[0048] Example 1

[0049] like Figure 1-3 As shown in the figure, this embodiment discloses a fully prefabricated rapid assembly internal structure for a large-diameter shield tunnel, which is installed inside the large-diameter shield tunnel 100. The internal structure of the present invention includes a central box culvert 1, side box culverts 2, and connecting steel plates 3.

[0050] The central box culvert 1 and the side box culverts 2 are both prefabricated components. The longitudinal width of the central box culvert 1 and the side box culverts 2 are adapted to the circumferential width of the tunnel lining segments to ensure the consistency of the dimensions and performance of the prefabricated components, thereby avoiding the possibility of assembly misalignment during actual construction. The central box culvert 1 is located in the middle of the large-diameter shield tunnel 100 and has a U-shaped frame structure. The two side box culverts 2 are located on the two transverse ends of the central box culvert 1 and have C-shaped openings, with the openings of the two side box culverts 2 facing each other. First angle steel 4 is pre-embedded at the top of the two transverse ends of the central box culvert, and second angle steel 5 is pre-embedded at the top connecting end of the side box culverts 2. Connecting steel plates 3 are welded to the top of the first angle steel 4 and the second angle steel 5. The bottom connecting end of the side box culverts 2 is provided with a tenon, while the bottom of the transverse end side of the central box culvert 1 is provided with a tenon. The side box culverts 2 are connected to the central box culvert 1 by tenon and mortise.

[0051] Compared to existing technologies, the internal structure of this invention does not require bolts for assembly. The internal structure of this invention is a fully prefabricated assembly structure. The top connection between the central box culvert 1 and the side box culverts 2 is achieved using embedded angle steel and welded steel plates, while the bottom connection between the central box culvert 1 and the side box culverts 2 uses mortise and tenon joints to limit displacement between the prefabricated structures, ensuring the integrity of the prefabricated structure. This assembly structure improves the accuracy and efficiency of prefabrication and assembly, resulting in greater economic benefits.

[0052] It should be noted that, in order to improve the reliability of the internal structure of the present invention, the top connection gaps of the central box culvert 1 and the side box culvert 2 are sealed by grouting.

[0053] Furthermore, such as Figure 4 As shown, the central box culvert 1 includes a load-bearing section 11, a vertical support section 12, and a bottom arc section 13, which are integrally formed during factory manufacturing. The top surface of the load-bearing section 11 is used to support the track or train. The bottom arc section 13 is located at the bottom of the inner lining of the large-diameter shield tunnel 100 and is concentric with the large-diameter shield tunnel 100. Four mutually spaced protrusions 9 are provided between the bottom arc section 13 and the inner lining of the large-diameter shield tunnel 100, acting on the segments in a "four-legged" manner. The thickness of the protrusions 9 is not less than 100mm to avoid bridging the circumferential joints of the lining segments during the assembly of the central box culvert 1. Two vertical support sections 12 are respectively fixedly connected to the two ends of the bottom arc section, and the two ends of the load-bearing section 11 are respectively fixedly connected to the tops of the two vertical support sections 12.

[0054] Furthermore, such as Figure 5 As shown, the side box culvert 2 includes a horizontal section 21 and an arc-shaped section 22. The arc-shaped section 22 is concentric with the large-diameter shield tunnel 100. The arc-shaped section 22 is located on the inner lining of the large-diameter shield tunnel 100. There are also four mutually spaced protrusions 9 between the bottom arc section 13 and the inner lining of the large-diameter shield tunnel 100, which act on the segments in a "four-legged tripod" manner, so that the distance between the bottom of the protrusion 9 and the arc-shaped section 22 is not less than 100mm, so as to avoid bridging the circumferential joint of the lining segments when the side box culvert 2 is assembled.

[0055] like Figure 1 , Figure 4 and Figure 5As shown, the bottom arc portion 13 and the arc-shaped portion 22 are provided with multiple grouting holes 8. After the middle box culvert 1 and the side box culvert 2 are connected and constructed, the bottom arc-shaped gap of the entire box culvert can be filled by grouting through the grouting holes 8 to ensure that the bottom of the entire box culvert is in full contact with the lining segments, avoiding the possibility of cracks in the inner lining of the large-diameter shield tunnel 100 due to uneven stress. Trapezoidal brackets 121 are provided on the outer sides of the two vertical support portions 12 of the middle box culvert 1. A nitrile cork rubber pad is provided on the top surface of the bracket 121, and the bottom side of the end of the horizontal portion 21 overlaps the top surface of the nitrile cork rubber pad. Through the above technical solution, the nitrile cork rubber plate is pasted on the top surface of the bracket 121 and the horizontal portion 21 overlaps on the nitrile cork rubber plate, which can ensure that the stress on the contact surface of the bracket 121 is uniform and improve the stability of the overall structure of the present invention.

[0056] Preferably, hoisting and positioning holes can be opened on the top of both the central box culvert 1 and the side box culvert 2 to facilitate hoisting and positioning during actual construction and improve construction efficiency.

[0057] Furthermore, such as Figure 6 As shown, a steel bar connector is pre-embedded in the arc-shaped part 22 of the side box culvert 2. The side box culvert 2 is fixedly connected to the inner lining of the large-diameter shield tunnel 100 by rebar installation and pouring, so as to limit the side box culvert 2 and further improve the stability of the internal structure of the present invention.

[0058] In this embodiment, the outer side of the side box culvert 2 needs to be roughened before pouring.

[0059] Unlike existing technologies, such as Figure 1 and Figure 7 As shown, the internal structure of the present invention also includes a quick connector 6. Multiple connection holes 7 are pre-drilled on the top of the longitudinal side of the central box culvert 1 and the side box culvert 2. The central box culvert 1 is pressed to the longitudinally adjacent central box culvert 1 through the quick connector 6, and the side box culvert 2 is pressed to the longitudinally adjacent side box culvert 2 through the quick connector 6.

[0060] Through the above technical solution, the multiple intermediate box culverts or side box culverts 2 of the present invention are connected longitudinally by quick connectors 6. This connection structure has higher strength and stability. Through specific connection and fixing methods, the installation can be completed by longitudinally pressing in during the assembly of the box culvert, thereby realizing the rapid assembly of the internal structure of the tunnel.

[0061] Specifically, the quick connector 6 includes a pre-embedded sleeve 61 and a connecting rod 62. The pre-embedded sleeve 61 includes a hollow cylindrical part and a hollow frustum part. The hollow cylindrical part and the hollow frustum part are concentric and integrally formed. The hollow cylindrical part is fastened to the inner wall of the connecting hole 7. The end of the hollow frustum part with a larger diameter is away from the hollow cylindrical part. Both ends of the connecting rod 62 are provided with toothed parts. The inner wall of the hollow cylindrical part is provided with toothed grooves for the toothed parts to be pressed. Both ends of the connecting rod 62 are respectively pressed into the longitudinally adjacent connecting holes 7.

[0062] In this embodiment, the quick connector 6 can be made of modified polyamide material.

[0063] Preferably, the protrusion of the toothed groove is slightly inclined toward the end of the quick connector 6. This structure is similar to a chamfered fishhook and has the advantage of being "easy to enter but difficult to exit", which can improve the connection stability between multiple box culverts.

[0064] Figure 8 This is a vertical displacement cloud diagram of the internal structure of a large-diameter shield tunnel under bidirectional train conditions, as described in this embodiment of the invention. It primarily depicts the load conditions of the internal structure under bidirectional train conditions. Specifically, the internal forces under these conditions are shown in Table 1.

[0065] Table 1

[0066] Central box culvert corbel 29.56 133.50 9.88 0.112 Bottom of the middle box culvert 0.14 — — 0.015 Central box culvert crosses the middle 75.50 0.72 56.41 0.885 Top of side box culvert 5.18 46.45 35.14 0.289

[0067] Figure 9 This is a vertical displacement cloud diagram of the left-side train load condition of the internal structure of the large-diameter shield tunnel fully prefabricated and rapidly assembled in this embodiment of the invention. It is mainly used to describe the load situation of the internal structure of the invention under the left-side train load condition. Specifically, under this condition, its internal force situation is shown in Table 2:

[0068] Table 2

[0069] Medium box culvert corbel 17.77 95.87 8.14 0.091 bottom of the middle box culvert 0.08 — — 0.011 Middle box culvert cross 36.86 4.84 49.48 0.714 Top of side box culvert 4.95 48.20 33.45 0.294

[0070] It should be emphasized that the relevant data in Tables 1 and 2 above are internal information and are not publicly known. The relevant data are limited by the specific structure of this invention.

[0071] Example 2

[0072] like Figure 10 As shown, this embodiment discloses a construction method for a fully prefabricated and rapidly assembled internal structure of a large-diameter shield tunnel, used to construct the fully prefabricated and rapidly assembled internal structure of the large-diameter shield tunnel in Embodiment 1. The method of this invention includes:

[0073] S1: Precast central box culvert 1 and side box culvert 2, which are adapted to the size, shape and thickness of the tunnel lining segments.

[0074] S2: After the tunnel lining segments are assembled, the middle box culvert 1 is installed to the preset position using the matching assembly device, and multiple bosses 9 are used to level the middle box culvert 1.

[0075] Specifically, after the shield tunnel segments are assembled, a special assembly device is used to lift the middle box culvert 1 to the installation position, and the bottom boss 9 is used for leveling. Through the above step S2, the following can be obtained: Figure 11 The effect shown.

[0076] S3: Using quick connectors 6, two longitudinally adjacent and aligned middle box culverts 1 are crimped together.

[0077] S4: Adhere nitrile cork rubber pads to the top surface of the corbel 121 of each central box culvert 1.

[0078] S5: After the longitudinal assembly of multiple central box culverts 1 is completed, the bottom end of the side box culverts 2 is mortised and tenoned to the bottom end of the central box culverts 1. Then, the second angle steel 5 pre-embedded at the top connecting end of the side box culverts 2 is welded to the first angle steel 4 at the top of the transverse end of the central box culverts 1 using connecting steel plates 3, forming a temporary box culvert as a whole.

[0079] Specifically, such as Figure 12 As shown, the bottom end of the side box culvert 2 is first mortised and tenoned to the bottom end of the middle box culvert 1 to achieve a temporary positioning effect. Then, the connecting steel plate 3 is welded on, and finally, the following can be obtained: Figure 13 The effect shown.

[0080] S6: Grouting is performed on the gap between the bottom arc surface of the temporary box culvert and the tunnel lining segments to form a grouting layer.

[0081] S7: Rebar is installed inside the tunnel lining segments near the end of the side box culvert 2, and the installed rebar is connected to the rebar connector pre-embedded in the side box culvert 2 to form the box culvert as a whole.

[0082] S8: Tie steel cages on both sides of the box culvert and pour concrete.

[0083] It should be noted that after step S8, the following can be obtained: Figure 14 The effect shown.

[0084] In summary, compared with the prior art, the internal structure and construction method obtained by the above embodiments have the following advantages:

[0085] 1) The internal structure of this invention adopts a fully prefabricated structure. The prefabricated central box culvert 1 and side box culvert 2 are connected by pre-embedded angle steel and welded steel plates, and the mortise and tenon groove is set to restrict the displacement between the prefabricated structures. This ensures the overall stress resistance of the prefabricated structure and eliminates the bolt connection commonly used in the prior art. The process is simple and improves the accuracy and efficiency of prefabrication assembly.

[0086] 2) The longitudinal connecting parts of the central box culvert 1 and the side box culvert 2 adopt quick connecting parts 6. This connection structure has high strength and stability, replaces the existing bolt connection, eliminates the bolt tightening process, realizes the rapid assembly of the internal structure of the precast tunnel, and shortens the construction cycle.

[0087] 3) Both the central box culvert 1 and the side box culvert 2 are manufactured in the factory, which allows for strict control of materials and quality standards, ensuring the consistency of the size and performance of prefabricated components, improving the overall construction quality of the tunnel's internal structure, and avoiding large-scale on-site construction in traditional construction methods, thus reducing construction safety risks.

[0088] 4) The method of the present invention reduces material waste and labor costs during the construction process, while also reducing the construction cycle, improving labor efficiency and management efficiency, and reducing construction costs.

[0089] 5) The method of this invention realizes the overall prefabrication and assembly of the internal structure of a large-diameter shield tunnel 100. The construction process is highly mechanized, efficient and convenient. With the help of intelligent assembly equipment, it is conducive to the development of intelligent construction and can promote the further development of tunnel internal structure prefabrication and assembly technology.

[0090] For those skilled in the art, various other corresponding changes and modifications can be made based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of this invention.

Claims

1. A fully prefabricated and rapidly assembled internal structure for a large-diameter shield tunnel, located inside a large-diameter shield tunnel (100), characterized in that, It includes a prefabricated central box culvert (1), prefabricated side box culverts (2), and connecting steel plates (3); the bottom sides of the central box culvert (1) and the side box culverts (2) are provided with multiple protrusions (9), and the central box culvert (1) and the side box culverts (2) are connected to the inner lining of the large-diameter shield tunnel (100) through multiple protrusions (9); the central box culvert (1) is located in the middle of the large-diameter shield tunnel (100), the central box culvert (1) is a U-shaped frame structure, the side box culverts (2) are C-shaped opening structures, the openings of the two side box culverts (2) face each other and are respectively located on the two transverse end sides of the central box culvert (1); the longitudinal width of the central box culvert (1) and the side box culverts (2) is adapted to the circumferential width of the tunnel lining segments; The top of the two transverse ends of the central box culvert (1) is pre-embedded with first angle steel (4), and the top connecting end of the side box culvert (2) is pre-embedded with second angle steel (5). The connecting steel plate (3) is welded to the top of the first angle steel (4) and the second angle steel (5). The bottom connecting end of the side box culvert (2) is mortised and tenoned to the bottom of the transverse side of the central box culvert (1). It also includes quick connectors (6). The top of the longitudinal side of the central box culvert (1) and the side box culvert (2) are pre-opened with multiple connecting holes (7) for the quick connectors (6) to be pressed longitudinally. The inner wall of the connecting hole (7) is provided with toothed grooves, and the protrusion of the toothed grooves is slightly inclined towards the end of the quick connectors (6). The central box culvert (1) is pressed into the longitudinally adjacent central box culvert (1) through the quick connectors (6), and the side box culvert (2) is pressed into the longitudinally adjacent side box culvert (2) through the quick connectors (6).

2. The fully prefabricated and rapidly assembled internal structure of a large-diameter shield tunnel according to claim 1, characterized in that, The quick connector (6) includes a pre-embedded sleeve (61) and a connecting rod (62). The pre-embedded sleeve (61) includes a hollow cylindrical part and a hollow frustum part. The hollow cylindrical part and the hollow frustum part are concentric and integrally formed. The hollow cylindrical part is fastened to the inner wall of the connecting hole (7). The end of the hollow frustum part with a larger diameter is away from the hollow cylindrical part. Both ends of the connecting rod (62) are provided with toothed parts. The inner wall of the hollow cylindrical part is provided with toothed grooves for the toothed parts to be pressed. Both ends of the connecting rod (62) are respectively pressed into the longitudinally adjacent connecting holes (7).

3. The fully prefabricated and rapidly assembled internal structure of a large-diameter shield tunnel according to claim 1, characterized in that, The central box culvert (1) includes a load-bearing part (11), a vertical support part (12), and a bottom arc part (13). The bottom arc part (13) is located on the inner bottom of the large-diameter shield tunnel (100). The bottom arc part (13) is concentric with the large-diameter shield tunnel (100). The two vertical support parts (12) are respectively fixedly connected to the two ends of the bottom arc part (13). The two ends of the load-bearing part (11) are respectively fixedly connected to the top ends of the two vertical support parts (12).

4. The fully prefabricated and rapidly assembled internal structure of a large-diameter shield tunnel according to claim 3, characterized in that, The side box culvert (2) includes a horizontal part (21) and an arc-shaped part (22). The arc-shaped part (22) is concentric with the large-diameter shield tunnel (100). The arc-shaped part (22) is located on the inner bottom of the large-diameter shield tunnel (100). The bottom end of the arc-shaped part (22) is tenoned to the bottom end of the vertical support part (12). One end of the horizontal part (21) is fixedly connected to the top end of the arc-shaped part (22), and the other end is fixedly connected to the transverse end of the bearing part (11).

5. The fully prefabricated and rapidly assembled internal structure of a large-diameter shield tunnel according to claim 4, characterized in that, The two vertical support parts (12) are provided with brackets (121) on their outer sides. The top surface of the brackets (121) is provided with a nitrile cork rubber pad. The bottom side of the end of the horizontal part (21) overlaps the top surface of the nitrile cork rubber pad.

6. The fully prefabricated and rapidly assembled internal structure of a large-diameter shield tunnel according to claim 4, characterized in that, The bottom arc portion (13) and the arc-shaped portion (22) are provided with a plurality of grouting holes (8).

7. The fully prefabricated and rapidly assembled internal structure of a large-diameter shield tunnel according to claim 1, characterized in that, A grouting layer is provided between the bottom sides of the central box culvert (1) and the side box culvert (2) and the inner lining of the large-diameter shield tunnel (100).

8. The fully prefabricated and rapidly assembled internal structure of a large-diameter shield tunnel according to claim 1, characterized in that, The side box culvert (2) is fixedly connected to the inner lining of the large-diameter shield tunnel (100) by rebar installation and pouring.

9. A construction method for a fully prefabricated and rapidly assembled internal structure of a large-diameter shield tunnel, used to construct the fully prefabricated and rapidly assembled internal structure of a large-diameter shield tunnel as described in any one of claims 1-8, characterized in that... The method includes: S1: Prefabricated central box culvert (1) and side box culvert (2) adapted to the size, shape and thickness of the tunnel lining segments; S2: After the tunnel lining segments are assembled, the middle box culvert (1) is installed to the preset position using the matching assembly device, and the middle box culvert (1) is leveled using multiple bosses (9); S3: Using quick connectors (6), two longitudinally adjacent and aligned middle box culverts (1) are crimped together; S4: A nitrile cork rubber pad is pasted on the top surface of the corbel (121) of each central box culvert (1); S5: After the longitudinal assembly of multiple middle box culverts (1) is completed, the bottom end of the side box culvert (2) is mortised and tenoned to the bottom end of the middle box culvert (1). Then, the second angle steel (5) pre-embedded at the top connection end of the side box culvert (2) is welded to the first angle steel (4) at the top of the transverse end of the middle box culvert (1) using connecting steel plates (3) to form a temporary box culvert as a whole. S6: Grouting is performed into the gap between the bottom arc surface of the temporary box culvert and the tunnel lining segments to form a grouting layer; S7: Rebar is installed inside the tunnel lining segments near the end of the side box culvert (2), and the installed rebar is connected to the rebar connector pre-embedded in the side box culvert (2) to form a whole box culvert; S8: Tie steel cages on both sides of the box culvert and pour concrete.

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