Shield tunneling method: Multi-layer internal structure and construction method based on steel-concrete composite

Abstract

This invention discloses a multi-layered internal structure for shield tunneling based on a steel-concrete composite structure, including a flue slab, an upper lane slab, and a lower lane slab. The flue frame structure of the flue slab is connected to the steel plates pre-embedded in the corresponding tunnel segments, and the edges of the corresponding steel-concrete composite slab are sealed to the corresponding tunnel segments by cast-in-place concrete. The upper lane frame structure of the upper lane slab is fixed to the steel plates pre-embedded in the corresponding tunnel segments by multiple upper lane steel brackets. The lower lane slab has precast components at the bottom of the tunnel, with steel-concrete composite slabs on both sides, and the outer sides of the steel-concrete composite slabs are supported on steel longitudinal beams. The steel longitudinal beams are fixed to the steel plates pre-embedded in the corresponding tunnel segments by multiple lower lane steel brackets. During construction, the lower lane slab, upper lane slab, and flue slab are constructed sequentially from bottom to top, and finally the asphalt pavement layer is laid. The application of this invention reduces the self-weight, eliminates the need for rebar installation in tunnel segments, improves structural reliability and construction efficiency, and also frees up internal space in the tunnel.

Description

Technical Field

[0001] This invention relates to the field of shield tunnel construction technology, and in particular to a multi-layered internal structure and construction method of shield tunnels based on steel-concrete composite. Background Technology

[0002] In existing technologies, the internal structure of shield tunnels is mostly constructed using reinforced concrete cast-in-place or precast assembly structures. However, this approach has certain shortcomings in practical applications, such as:

[0003] 1. Cast-in-place reinforced concrete construction is slow, the quality of the pouring is difficult to guarantee, and the environmental impact of material transportation, such as traffic congestion, noise, and exhaust fumes, is significant.

[0004] 2. Reinforced concrete precast assembly work: precast components are heavy, which is not conducive to construction;

[0005] 3. In the two traditional construction methods mentioned above, the upper structure transfers the load to the lower foundation through beams, columns or walls. The connection between the foundation and the segments is completed by rebar installation. The reliability of the structure is uncertain and the overall efficiency is low.

[0006] 4. The two traditional construction methods mentioned above occupy a large amount of space in the circular tunnel, which reduces the efficiency of space utilization.

[0007] Therefore, how to reduce self-weight load, improve structural reliability and construction efficiency, and further release the internal space of the tunnel has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0008] In view of the above-mentioned deficiencies of the prior art, the present invention provides a multi-layer internal structure and construction method for shield tunnels based on steel-concrete composite, the purpose of which is to reduce the self-weight load of the tunnel internal structure, eliminate the segment reinforcement work, improve structural reliability and construction efficiency, and further free up the internal space of the tunnel.

[0009] To achieve the above objectives, this invention discloses a multi-layer internal structure of a shield tunnel based on a steel-concrete composite structure, wherein the tunnel is provided with a flue slab, an upper lane slab, and a lower lane slab in sequence from top to bottom; the tunnel includes multiple ring segments along its length.

[0010] The flue plate includes a steel-concrete composite plate and a flue frame structure formed by flue crossbeams and flue longitudinal beams, which are disposed under the corresponding steel-concrete composite plate.

[0011] The flue frame structure is connected to the steel plate pre-embedded in the tube segment at the corresponding position;

[0012] The flue duct is sealed by cast-in-place concrete between the steel-concrete composite plate near the two side edges and the corresponding pipe segments.

[0013] The upper lane slab includes the steel-concrete composite slab and an upper lane frame structure formed by upper lane crossbeams and upper lane longitudinal beams, which are disposed under the corresponding steel-concrete composite slab;

[0014] The upper lane frame structure is fixed by multiple upper lane steel brackets symmetrically arranged on both sides and the steel plates pre-embedded in the corresponding segments;

[0015] The lower lane slab includes the steel-concrete composite slab, as well as precast components and steel longitudinal beams for supporting the corresponding steel-concrete composite slab;

[0016] The precast shaped component is set at the bottom of the tunnel, and the steel-concrete composite plate is symmetrically arranged on both sides of the upper surface. The outer sides of the steel-concrete composite plate on both sides are supported on the steel longitudinal beam.

[0017] Each of the steel longitudinal beams is fixed to the steel plate pre-embedded in the segment at the corresponding position by multiple lower lane steel brackets.

[0018] Preferably, an upper road surface is laid on the upper surface of the steel-concrete composite slab near the middle, and upper road crash barriers are symmetrically arranged on both sides of the upper road surface.

[0019] The entire surface area above the steel-concrete composite slab of the lower lane slab is covered with the lower road surface.

[0020] On both sides of the lower lane slab, a lower lane anti-collision wall is symmetrically provided between the corresponding segments;

[0021] Both the upper and lower road surfaces consist of concrete pavement and asphalt pavement from bottom to top.

[0022] More preferably, each of the upper lane crash barriers is fixed to the corresponding steel-concrete composite slab by anchor bars;

[0023] Each of the lower lane crash barriers is fixed to the steel plate pre-embedded in the corresponding segment by anchor bars;

[0024] Each of the steel-concrete composite slabs is prefabricated using concrete and profiled steel sheets.

[0025] More preferably, the steel-concrete composite panel of the lower lane slab is horizontally isolated from the corresponding lower lane crash barrier and from the shaped precast component by nitrile cork rubber pads;

[0026] The steel-concrete composite slab of the lower lane slab is connected to the pre-embedded steel structure in the pre-formed component and each of the corresponding steel longitudinal beams by multiple studs.

[0027] The steel-concrete composite slab of the upper lane is connected to the corresponding upper lane crossbeam and the corresponding upper lane longitudinal beam by a plurality of studs;

[0028] The steel-concrete composite plate of the flue plate is connected to the corresponding flue crossbeam and the corresponding flue longitudinal beam by a plurality of studs.

[0029] Preferably, in the multi-ring tunnel segments, a ring of steel plates is pre-embedded in each segment at intervals of 6 to 10 meters.

[0030] Preferably, the flue frame structure and the corresponding steel plate, the upper lane frame structure and each upper lane steel bracket, each upper lane steel bracket and the corresponding steel plate, each steel longitudinal beam and each lower lane steel bracket, and each lower lane steel bracket and the corresponding steel plate are all connected by welding.

[0031] Preferably, the surfaces of the metal parts of the flue frame structure and the upper lane frame structure are treated with anti-corrosion and fireproofing.

[0032] This invention also provides a construction method for shield tunnels based on a multi-layered internal structure of steel-concrete composite, comprising the following steps:

[0033] Step 1: Assemble the multi-ring segments to form a tunnel; inside the tunnel, a steel plate is pre-embedded every 6 to 10 meters of the segments;

[0034] Step 2: Precast flue frame structure, upper lane frame structure, precast duct components, all steel longitudinal beams, all steel-concrete composite slabs, all upper lane corbels and all lower lane corbels;

[0035] Step 3: Construct the lower lane slab and complete the concrete paving of the lower lane crash barrier and the lower road surface;

[0036] Step 4: Construct the upper lane slab and complete the concrete paving of the upper lane crash barrier and the upper road surface;

[0037] Step 5: Connect the flue frame structure to the steel plates pre-embedded in the corresponding segments, and hoist and install the corresponding steel-concrete composite panels;

[0038] Step 6: Construct cast-in-place concrete on the steel-concrete composite plate of the flue plate near the two side edges between the pipe segments at the corresponding positions to form a flue seal.

[0039] Step 7: Complete the asphalt pavement layer laying of the lower and upper road surfaces;

[0040] Step 8: Internal structure completed.

[0041] Preferably, step 3 includes the following steps:

[0042] Step 3.1: Install the pre-fabricated opening at the bottom of the tunnel;

[0043] Step 3.2: Connect the anchor bars used to fix the lower lane crash barrier to the steel plates pre-embedded in the corresponding positions of the pipe segments, and roughen the joint surface of the pipe segments and the lower lane crash barrier. After binding the steel bars of the lower lane crash barrier, pour the lower lane crash barrier.

[0044] Step 3.3: Connect the lower lane steel brackets used to fix each of the steel longitudinal beams to the steel plates pre-embedded in the segments at the corresponding positions, and set the corresponding steel longitudinal beams;

[0045] Step 3.4: Hoist the steel-concrete composite slab of the lower lane slab and connect the corresponding steel-concrete composite slab to the embedded steel structure in the precast part and each of the corresponding steel longitudinal beams by means of studs;

[0046] Step 3.5: Lay the concrete pavement of the lower road surface on the lower lane slab.

[0047] Preferably, step 4 includes the following steps:

[0048] Step 4.1: Connect all the upper lane steel brackets used to fix the upper lane frame structure to the steel plates pre-embedded in the corresponding segments, and connect the upper lane crossbeams and upper lane longitudinal beams to form the upper lane frame structure by welding.

[0049] Step 4.2: Hoist the steel-concrete composite slab of the upper lane and connect it to the corresponding upper lane crossbeam and the corresponding upper lane longitudinal beam by means of studs;

[0050] Step 4.3: Lay the concrete pavement of the upper road surface on the upper lane slab and set up the upper lane crash barrier; each of the upper lane crash barriers is fixed to the corresponding steel-concrete composite slab by anchor bars.

[0051] The beneficial effects of this invention are:

[0052] The application of this invention reduces the self-weight load, eliminates the segment rebar installation work, improves structural reliability and construction efficiency, and can also avoid the setting of traditional vertical support columns or walls, freeing up the internal space of the tunnel. Compared with the existing technology, it has better economic and social benefits.

[0053] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0054] Figure 1 A schematic diagram of the cross-sectional structure of a tunnel in one embodiment of the present invention is shown.

[0055] Figure 2 This diagram shows a side view of the connection between the upper lane steel bracket and the corresponding segment in one embodiment of the present invention.

[0056] Figure 3 This diagram shows a planar structural schematic of the connection between the upper lane steel bracket and the corresponding segment in one embodiment of the present invention.

[0057] Figure 4 This diagram shows a side view of the connection between the lower lane steel bracket and the corresponding segment in one embodiment of the present invention.

[0058] Figure 5 This diagram shows a planar structural schematic of the connection between the lower lane steel bracket and the corresponding segment in one embodiment of the present invention.

[0059] Figure 6 This is a schematic diagram of the side structure of the connection between the flue plate and the pipe segment in one embodiment of the present invention.

[0060] Figure 7 This diagram shows a side view of the connection between the upper lane slab and the pipe segment in one embodiment of the present invention.

[0061] Figure 8 This diagram shows a side view of the connection between the lower lane slab and the pipe segment in one embodiment of the present invention.

[0062] Figure 9 This diagram illustrates a planar structural connection between the flue plate and the pipe segment in one embodiment of the present invention.

[0063] Figure 10 This diagram illustrates a planar structural connection between the upper lane slab and the pipe segment in one embodiment of the present invention.

[0064] Figure 11 This diagram illustrates a planar structural connection between the lower lane slab and the segment in one embodiment of the present invention. Detailed Implementation

[0065] Example: Figures 1 to 11 As shown, the shield tunnel is based on a multi-layer internal structure of steel-concrete composite. The tunnel is equipped with a flue slab, an upper lane slab, and a lower lane slab from top to bottom. The tunnel includes multiple ring segments 4 along its length.

[0066] The flue plate includes a steel-concrete composite plate 1, and a flue frame structure formed by flue crossbeams 2 and flue longitudinal beams 3, which is set under the corresponding steel-concrete composite plate 1.

[0067] The flue frame structure is connected to the steel plate 5 pre-embedded in the corresponding segment 4;

[0068] The flue duct is sealed with cast-in-place concrete between the steel-concrete composite plate 1 near the two side edges and the corresponding pipe segments 4.

[0069] The upper lane slab includes a steel-concrete composite slab 1, and an upper lane frame structure formed by upper lane crossbeams 7 and upper lane longitudinal beams 8, which are set under the corresponding steel-concrete composite slab 1.

[0070] The upper lane frame structure is fixed by multiple upper lane steel brackets 9 symmetrically arranged on both sides and steel plates 5 pre-embedded in the corresponding segments 4;

[0071] The lower lane slab includes a steel-concrete composite slab 1, as well as precast shaped components 10 and steel longitudinal beams 11 for supporting the corresponding steel-concrete composite slab 1;

[0072] The precast 10 is set at the bottom of the tunnel, and the upper surface is symmetrically provided with steel-concrete composite plates 1 on both sides. The outer sides of the steel-concrete composite plates 1 on both sides are supported on the steel longitudinal beams 11.

[0073] Each type of steel longitudinal beam 11 is fixed to the steel plate 5 pre-embedded in the corresponding segment 4 by multiple lower lane steel brackets 12.

[0074] This invention reduces the self-weight load by prefabricating steel-concrete composite slabs using concrete and profiled steel sheets, and avoids the need for traditional vertical support columns or walls by welding brackets to the pre-embedded steel plates inside the tunnel segments, eliminating the need for rebar installation in the tunnel segments and freeing up internal space in the circular tunnel.

[0075] This invention significantly reduces the workload of cast-in-place construction by applying a steel-concrete composite structure. It not only improves structural reliability and construction efficiency, but also frees up space on both sides of the lower-level traveling vehicle, resulting in better visibility and more flexible placement of pipelines, signs, etc.

[0076] In some embodiments, an upper road surface is laid on the upper surface of the steel-concrete composite slab 1 of the upper lane slab near the middle position, and upper lane crash barriers 13 are symmetrically provided on both sides of the upper road surface.

[0077] The entire area above the steel-concrete composite slab 1 of the lower lane slab is paved with the lower road surface.

[0078] On both sides of the lower lane slab, a lower lane crash barrier 14 is symmetrically provided between the corresponding segments 4;

[0079] Both the upper and lower road surfaces consist of a concrete pavement 15 and an asphalt pavement layer 16 from bottom to top.

[0080] In some embodiments, each upper lane crash barrier 13 is fixed to the corresponding steel-concrete composite slab 1 by anchor bars;

[0081] Each lower-level lane crash barrier 14 is fixed to the steel plate 5 embedded in the corresponding segment 4 by anchor bars;

[0082] Each steel-concrete composite slab 1 is prefabricated using concrete and profiled steel sheet 5.

[0083] In some embodiments, the steel-concrete composite panel 1 of the lower lane slab is horizontally isolated from the corresponding lower lane crash barrier 14 and from the shaped precast component 10 by nitrile cork rubber pads.

[0084] The steel-concrete composite slab 1 of the lower lane slab is connected to the pre-embedded steel structure in the precast component 10 and the corresponding steel longitudinal beam 11 by multiple studs 17.

[0085] The steel-concrete composite plate 1 of the upper lane is connected to the corresponding upper lane crossbeam 7 and the corresponding upper lane longitudinal beam 8 by multiple studs 17;

[0086] The steel-concrete composite plate 1 of the flue plate is connected to the corresponding flue crossbeam 2 and the corresponding flue longitudinal beam 3 by multiple studs 17.

[0087] In some embodiments, in the multi-ring segments 4 of the tunnel, a steel plate 5 is pre-embedded in the corresponding segment 4 at intervals of 6 to 10 meters.

[0088] In some embodiments, the flue frame structure and the corresponding steel plate 5, the upper lane frame structure and each upper lane steel bracket 9, each upper lane steel bracket 9 and the corresponding steel plate 5, each steel longitudinal beam 11 and the corresponding lower lane steel bracket 12, and each lower lane steel bracket 12 and the corresponding steel plate 5 are all connected by welding.

[0089] In some embodiments, the surfaces of the metal components of both the flue frame structure and the upper driveway frame structure are treated with anti-corrosion and fireproofing.

[0090] Specific examples include applying fire-retardant coatings and galvanizing for corrosion protection.

[0091] This invention also provides a construction method for shield tunnels based on a multi-layered internal structure of steel-concrete composite, comprising the following steps:

[0092] Step 1: Assemble the multi-ring segments 4 to form a tunnel; inside the tunnel, a steel plate 5 is pre-embedded every 6 to 10 meters of the segments 4;

[0093] Step 2: Precast flue frame structure, upper lane frame structure, precast duct components 10, all steel longitudinal beams 11, all steel-concrete composite slabs 1, all upper lane corbels and all lower lane corbels;

[0094] Step 3: Construct the lower lane slab and complete the lower lane crash barrier 14 and the concrete pavement 15 of the lower road surface;

[0095] Step 4: Construct the upper lane slab and complete the upper lane crash barrier 13 and the upper road surface concrete paving 15;

[0096] Step 5: Connect the flue frame structure to the steel plate 5 embedded in the corresponding segment 4, and hoist and install the corresponding steel-concrete composite slab 1.

[0097] Step 6: Construct cast-in-place concrete on the steel-concrete composite plate 1 of the flue slab near the two side edges between the corresponding pipe segments 4 to form the flue block 6;

[0098] Step 7: Complete the laying of the asphalt pavement layer 16 for the lower and upper road surfaces;

[0099] Step 8: Internal structure completed.

[0100] In some embodiments, step 3 includes the following steps:

[0101] Step 3.1: Install the precast opening component 10 at the bottom of the tunnel;

[0102] Step 3.2: Connect the anchor bars used to fix the lower lane crash barrier 14 to the steel plates 5 pre-embedded in the corresponding segments 4, and roughen the joint surface of the segment 4 and the lower lane crash barrier 14. After binding the steel bars of the lower lane crash barrier 14, pour the lower lane crash barrier 14.

[0103] Step 3.3: Connect the lower lane steel bracket 12 used to fix each steel longitudinal beam 11 to the steel plate 5 pre-embedded in the corresponding segment 4, and set the corresponding steel longitudinal beam 11.

[0104] Step 3.4: Hoist the steel-concrete composite slab 1 of the lower lane slab, and connect the corresponding steel-concrete composite slab 1 to the embedded steel structure in the precast part 10 and the corresponding steel longitudinal beam 11 through the studs 17.

[0105] Step 3.5: Lay the concrete pavement of the lower road surface on the lower lane slab 15.

[0106] In some embodiments, step 4 includes the following steps:

[0107] Step 4.1: Connect all the upper lane steel brackets 9 used to fix the upper lane frame structure to the steel plates 5 pre-embedded in the corresponding segments 4, and connect the upper lane crossbeams 7 and upper lane longitudinal beams 8 by welding to form the upper lane frame structure.

[0108] Step 4.2: Hoist the steel-concrete composite panel 1 of the upper lane slab and connect it to the corresponding upper lane crossbeam 7 and the corresponding upper lane longitudinal beam 8 through studs 17;

[0109] Step 4.3: Lay the concrete pavement 15 of the upper lane slab and set up the upper lane crash barrier 13; each upper lane crash barrier 13 is fixed to the corresponding steel-concrete composite slab 1 by anchor bars.

[0110] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. The shield tunnel is based on a multi-layered internal structure of steel-concrete composite, with a flue slab, an upper lane slab, and a lower lane slab arranged sequentially from top to bottom; the tunnel includes multiple ring segments (4) along its length; characterized in that: The flue plate includes a steel-concrete composite plate (1) and a flue frame structure formed by flue crossbeams (2) and flue longitudinal beams (3) disposed under the corresponding steel-concrete composite plate (1); The flue frame structure is connected to the steel plate (5) pre-embedded in the corresponding segment (4); The flue is sealed (6) by cast-in-place concrete between the steel-concrete composite plate (1) near the two side edges and the corresponding pipe segments (4). The upper lane slab includes the steel-concrete composite slab (1) and an upper lane frame structure formed by upper lane crossbeams (7) and upper lane longitudinal beams (8) disposed under the corresponding steel-concrete composite slab (1); The upper lane frame structure is fixed by multiple upper lane steel brackets (9) symmetrically arranged on both sides and the steel plates (5) pre-embedded in the corresponding segments (4); The lower lane slab includes the steel-concrete composite slab (1), as well as precast shaped components (10) and steel longitudinal beams (11) for supporting the corresponding steel-concrete composite slab (1). The precast part (10) is set at the bottom of the tunnel, and the steel-concrete composite plate (1) is symmetrically provided on both sides of the upper surface. The outer sides of the steel-concrete composite plate (1) on both sides are supported on the steel longitudinal beam (11). Each of the steel longitudinal beams (11) is fixed to the steel plate (5) pre-embedded in the corresponding segment (4) by multiple lower lane steel brackets (12).

2. The shield tunnel based on a multi-layered internal structure of steel-concrete composite as described in claim 1, characterized in that, The upper road surface is laid on the upper layer of the steel-concrete composite slab (1) near the middle position, and the upper road surface is provided with upper lane anti-collision walls (13) symmetrically on both sides of the upper road surface. The entire surface area of ​​the steel-concrete composite slab (1) of the lower lane slab is covered with the lower road surface. On both sides of the lower lane slab, a lower lane anti-collision wall (14) is symmetrically provided between the corresponding pipe segment (4). Both the upper and lower road surfaces consist of a concrete pavement (15) and an asphalt pavement layer (16) from bottom to top.

3. The shield tunnel based on a multi-layered internal structure of steel-concrete composite as described in claim 2, characterized in that, Each of the upper lane crash barriers (13) is fixed to the corresponding steel-concrete composite slab (1) by anchor bars; Each of the lower lane crash barriers (14) is fixed to the steel plate (5) pre-embedded in the corresponding segment (4) by anchor bars; Each of the steel-concrete composite panels (1) is prefabricated using concrete and profiled steel sheets (5).

4. The shield tunnel based on a multi-layered internal structure of steel-concrete composite as described in claim 3, characterized in that, The steel-concrete composite panel (1) of the lower lane slab is horizontally isolated from the corresponding lower lane crash barrier (14) and from the preformed part (10) by nitrile cork rubber pads. The steel-concrete composite slab (1) of the lower lane slab is connected to the pre-embedded steel plate in the pre-formed component (10) and each of the steel longitudinal beams (11) by a plurality of studs (17). The steel-concrete composite slab (1) of the upper lane slab is connected to the corresponding upper lane crossbeam (7) and the corresponding upper lane longitudinal beam (8) by a plurality of studs (17); The steel-concrete composite plate (1) of the flue plate is connected to the corresponding flue crossbeam (2) and the corresponding flue longitudinal beam (3) by a plurality of studs (17).

5. The shield tunnel based on a multi-layered internal structure of steel-concrete composite as described in claim 1, characterized in that, In the multi-ring segment (4) of the tunnel, a steel plate (5) is pre-embedded in the segment (4) every 6 to 10 meters.

6. The shield tunnel based on a multi-layered internal structure of steel-concrete composite as described in claim 1, characterized in that, The flue frame structure and the corresponding steel plate (5), the upper lane frame structure and each upper lane steel bracket (9), each upper lane steel bracket (9) and the corresponding steel plate (5), each steel longitudinal beam (11) and each corresponding lower lane steel bracket (12), and each lower lane steel bracket (12) and the corresponding steel plate (5) are all connected by welding.

7. The shield tunnel based on a multi-layered internal structure of steel-concrete composite as described in claim 1, characterized in that, The surfaces of the metal parts of both the flue frame structure and the upper lane frame structure are treated with anti-corrosion and fireproofing agents.

8. The construction method for a shield tunnel based on a multi-layered internal structure of steel-concrete composite as described in claim 1, characterized in that, Includes the following steps: Step 1: Splice the multi-ring segments (4) into a tunnel; inside the tunnel, a steel plate (5) is pre-embedded every 6 to 10 meters of the segments (4); Step 2: Precast flue frame structure, upper lane frame structure, precast duct components (10), all steel longitudinal beams (11), all steel-concrete composite slabs (1), all upper lane corbels and all lower lane corbels; Step 3: Construct the lower lane slab and complete the lower lane crash barrier (14) and the concrete paving of the lower road surface (15). Step 4: Construct the upper lane slab and complete the upper lane crash barrier (13) and the concrete paving of the upper road surface (15). Step 5: Connect the flue frame structure to the steel plate (5) pre-embedded in the corresponding pipe segment (4), and hoist and install the corresponding steel-concrete composite plate (1). Step 6: Construct cast-in-place concrete on the steel-concrete composite plate (1) of the flue plate near the two side edges between the pipe segments (4) at the corresponding positions to form a flue blockage (6). Step 7: Complete the asphalt pavement layer (16) of the lower road surface and the upper road surface; Step 8: Internal structure completed.

9. The construction method for a shield tunnel based on a multi-layered internal structure of steel-concrete composite as described in claim 8, characterized in that, Step 3 includes the following steps: Step 3.1: Install the pre-formed mouth section (10) at the bottom of the tunnel. Step 3.2: Connect the anchor bars used to fix the lower lane crash barrier (14) to the steel plates (5) pre-embedded in the corresponding positions of the pipe segments (4), and roughen the joint surface of the pipe segments (4) and the lower lane crash barrier (14). After binding the steel bars of the lower lane crash barrier (14), pour the lower lane crash barrier (14). Step 3.3: Connect the lower lane steel bracket (12) used to fix each of the steel longitudinal beams (11) to the steel plate (5) pre-embedded in the corresponding segment (4), and set the corresponding steel longitudinal beams (11). Step 3.4: Hoist the steel-concrete composite slab (1) of the lower lane slab and connect the corresponding steel-concrete composite slab (1) to the embedded steel structure in the precast part (10) and the corresponding steel longitudinal beam (11) by means of studs (17). Step 3.5: Lay the concrete pavement of the lower road surface on the lower lane slab (15).

10. The construction method for a shield tunnel based on a multi-layered internal structure of steel-concrete composite as described in claim 8, characterized in that, Step 4 includes the following steps: Step 4.1: Connect all the upper lane steel brackets (9) used to fix the upper lane frame structure to the steel plates (5) pre-embedded in the corresponding segments (4), and connect the upper lane crossbeams (7) and upper lane longitudinal beams (8) to form the upper lane frame structure by welding. Step 4.2: Hoist the steel-concrete composite slab (1) of the upper lane slab and connect it to the corresponding upper lane crossbeam (7) and the corresponding upper lane longitudinal beam (8) by means of studs (17); Step 4.3: Lay the concrete pavement (15) of the upper road surface on the upper lane slab and set up the upper lane crash barrier (13); each of the upper lane crash barriers (13) is fixed to the corresponding steel-concrete composite slab (1) by anchor bars.

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