Pre-paving immersed tube tunnel and construction method of pre-paving integral tube joint immersed tube tunnel

Abstract

The invention provides a pre-paving method immersed tube tunnel and a construction method of a pre-paving method integral type tube joint immersed tube tunnel, and belongs to the field of tunnels, the pre-paving method immersed tube tunnel comprises a tunnel body, a broken stone hardcore and an adjusting assembly, and the broken stone hardcore is arranged below the tunnel body; the adjusting assembly comprises a first adjusting layer, a second adjusting layer and a grouting mechanism, the first adjusting layer and the second adjusting layer are both arranged between the tunnel body and the broken stone hardcore, the first adjusting layer and the second adjusting layer are sequentially arranged from bottom to top, the first adjusting layer comprises a plurality of first bags evenly laid on the broken stone hardcore, and the second adjusting layer comprises a plurality of second bags evenly laid on the broken stone hardcore; the second adjusting layer comprises a plurality of second bags evenly laid above the first bags, all the second bags are located between the first bags and the tunnel body, and the grouting mechanism comprises first grouting pipes communicating with the first bags and second grouting pipes communicating with the second bags. Compared with the prior art, by arranging the double-layer bag, the technical problem that an existing integral immersed tube tunnel is prone to being damaged due to sedimentation is solved.

Description

Technical Field

[0001] The invention belongs to the field of tunnels. More specifically, it relates to a pre-laid immersed tunnel, and the invention also relates to a construction method for a pre-laid integral pipe joint immersed tunnel. Background Art

[0002] An immersed tunnel is to prefabricate tunnel segments section by section, set temporary water stop heads at both ends of each section, then float them to the tunnel axis, sink them into a pre-dug trench (foundation trench), complete the underwater connection between the segments, remove the temporary water stop heads, backfill the foundation trench to protect the immersed tube, and lay the internal facilities of the tunnel, thereby forming a complete underwater passage. Immersed tunnels have lower requirements for the foundation, and are particularly suitable for engineering sites with soft foundations, shallow riverbeds or seabeds that are easy to excavate the foundation trench with dredging facilities on water. Due to its small burial depth, the total length of the tunnel line including the connection section is significantly shorter than that of tunnels constructed by the mining method and the shield method.

[0003] The foundation of the pre-laid immersed tunnel has the advantages of strong adaptability to soft foundations, high construction accuracy, good seismic performance, etc. However, the pre-laid foundation cannot be adjusted after construction. Especially for the integral pipe joint immersed tunnel in the net river area with soft-flow plastic strata, due to the small number of pipe joints for differential settlement, the adjustment ability of the pipe joints for differential settlement is reduced. Once the allowable joint deformation occurs due to foundation construction errors, uneven foundation trench backfill, post-construction backfill differences, etc., it may lead to diseases such as joint cracking and water leakage, and even cause inestimable consequences and losses.

[0004] It seriously threatens the service safety and operation life of the immersed tunnel. Excessive settlement will cause the pipe joint structure and joints to be stressed and deformed beyond the allowable value and be damaged. Under the action of uneven settlement, the joints will produce lateral deformation and internal forces, and excessive deformation and internal forces will cause structural damage to the joint shear keys. The longitudinal deformation response mechanism of the immersed tunnel is significantly affected by the joints. Differential settlement may lead to stability problems during the operation period of the tunnel. It is urgent to propose a new technology for compensating differential settlement of pipe joint joints to ensure the structural and waterproof safety of the immersed tunnel pipe joint construction and service period. Summary of the Invention

[0005] The purpose of the invention is to provide a pre-laid immersed tunnel to solve the technical problem that the existing integral immersed tunnel is easily damaged due to settlement.

[0006] To achieve the above purpose, the technical solution adopted by the invention is: to provide a pre-laid immersed tunnel, including: A tunnel body; A gravel cushion layer is arranged below the tunnel body, and the diameters of the stones in the gravel cushion layer decrease sequentially from top to bottom; Adjusting assembly, including a first adjusting layer, a second adjusting layer and a grouting mechanism. The first adjusting layer and the second adjusting layer are both arranged between the tunnel body and the crushed stone cushion layer. The first adjusting layer and the second adjusting layer are arranged in sequence from bottom to top. The first adjusting layer includes a plurality of first air bags evenly laid above the crushed stone cushion layer. The second adjusting layer includes a plurality of second air bags evenly laid above the first air bags, and each of the second air bags is located between the first air bags and the tunnel body. The grouting mechanism includes a first grouting pipe communicated with the first air bags, and a second grouting pipe communicated with the second air bags.

[0007] In a possible implementation manner, both the first grouting pipe and the second grouting pipe are arranged inside the tunnel body. The second air bags and the first air bags are attached to the bottom of the tunnel body from top to bottom as waterproof tarpaulins. The tunnel body is an integral pipe-jacking immersed tunnel.

[0008] In a possible implementation manner, both the first grouting pipe and the second grouting pipe are set as rubber pipes. A plurality of first joints are arranged at the bottom of the first grouting pipe, and each of the first joints is communicated with each of the first air bags respectively. A plurality of second joints are arranged at the bottom of the second grouting pipe, and each of the second joints is communicated with each of the second air bags respectively. A first steel pipe and a second steel pipe are arranged inside the tunnel body. The first grouting pipe is arranged in the first steel pipe, and the second grouting pipe is arranged in the second steel pipe.

[0009] In a possible implementation manner, check valves are arranged in both the first grouting pipe and the second grouting pipe.

[0010] In a possible implementation manner, the feed ports of the first grouting pipe and the second grouting pipe are both located on the inner wall of the tunnel body, and the length of the first grouting pipe is greater than the length of the first steel pipe, and the length of the second grouting pipe is greater than the length of the second steel pipe.

[0011] In a possible implementation manner, sealing rings are arranged at the feed ports of the first grouting pipe and the second grouting pipe.

[0012] In a possible implementation manner, the part of the first grouting pipe protruding outside the first steel pipe is folded and stored inside the first steel pipe, and the part of the second grouting pipe protruding outside the second steel pipe is folded and stored inside the second steel pipe.

[0013] In a possible implementation manner, adhesive layers are arranged between the first air bags and between the second air bags.

[0014] Compared with the prior art, the beneficial effects of the pre-laying method immersed tube tunnel provided by the present invention are as follows: First, by setting a graded structure with the stone diameters decreasing from top to bottom in the gravel cushion layer, in cooperation with the double-layer bag adjustment component, the above structure can achieve the synergistic effect of the bearing capacity gradient transition of the base layer and the dynamic settlement compensation. The optimization of the particle size gradient of the gravel cushion layer increases the foundation compression modulus by about 15%-20%, and the staged grouting design enables the tunnel settlement adjustment accuracy to reach within ±2 mm, solving the technical problem that it is difficult to accurately control the uneven settlement of the foundation of the traditional integral immersed tube tunnel. Moreover, after the tunnel undergoes secondary settlement, the present invention can also supplement the settlement amount of the tunnel segment by injecting grouting material into the second bag, so as to solve the technical problem of the too high maintenance cost after the existing immersed tube tunnel undergoes secondary settlement. Experimental simulation shows that this structure can reduce the secondary settlement amount by more than 40%, and is especially suitable for tunnel construction under soft soil foundation conditions.

[0015] Another object of the present invention is to propose a construction method for a pre-laying method integral segment immersed tube tunnel, which applies the pre-laying method immersed tube tunnel described above. The construction method for the pre-laying method integral segment immersed tube tunnel further includes the following steps: S1. During the prefabrication of the tunnel segment, first steel pipes and second steel pipes corresponding to the first grouting pipe and the second grouting pipe are set; S2. During the secondary outfitting of the tunnel segment, the first bag and the second bag are adhered to the bottom side of the tunnel segment through an adhesive material, and the first bag and the second bag serve as waterproof materials; S3. The first bag is grouted for the first time according to the settlement value of the tunnel segment; S4. After the first grouting, the second bag is grouted for the second time according to the settlement that appears again in the tunnel segment.

[0016] Compared with the prior art, the above structure can achieve the synergistic effect of the bearing capacity gradient transition of the base layer and the dynamic settlement compensation. The optimization of the particle size gradient of the gravel cushion layer increases the foundation compression modulus by about 15%-20%, and the staged grouting design enables the tunnel settlement adjustment accuracy to reach within ±2 mm, solving the technical problem that it is difficult to accurately control the uneven settlement of the foundation of the traditional integral immersed tube tunnel. Moreover, after the tunnel undergoes secondary settlement, the present invention can also supplement the settlement amount of the tunnel segment by injecting grouting material into the second bag, so as to solve the technical problem of the too high maintenance cost after the existing immersed tube tunnel undergoes secondary settlement. Moreover, the present invention can also use the first bag and the second bag without grouting material as waterproof layers to prevent the tunnel segment from being eroded by water flow.

[0017] In a possible implementation manner, the construction method for the pre-laying method integral segment immersed tube tunnel further includes the following steps after step S4: S5. Inject waterproof materials into the first adjustment layer and the second adjustment layer through the first steel pipe and the second steel pipe, so as to supplement the waterproof performance of the first bladder and the second bladder after deformation, thereby facilitating the prevention of phenomena such as water seepage or ground gushing at the bottom of the tunnel segment. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. In the drawings: Figure 1 It is a partial structural schematic diagram of the pre-laying method immersed tube tunnel provided by the present invention; Figure 2 It is a schematic diagram of the positional relationship between the steel pipe and the grouting pipe in the pre-laying method immersed tube tunnel provided by the present invention; Figure 3 It is a step diagram of the construction method of the pre-laying method integral segment immersed tube tunnel of the present invention.

[0019] In the figure: 1. Tunnel body; 11. First steel pipe; 12. Second steel pipe; 2. Gravel cushion layer; 3. Adjustment assembly; 31. First bladder; 32. Second bladder; 33. First grouting pipe; 34. Second grouting pipe. Detailed Embodiments

[0020] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0021] In the description of the present invention, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc. appear, they are based on the orientation or positional relationship shown in the 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 should not be construed as a limitation to the present invention.

[0022] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with specific situations.

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] Please refer to Figures 1 to 3 , and now the pre-laying method immersed tube tunnel provided by the present invention will be described. The pre-laying method immersed tube tunnel includes a tunnel body 1, a gravel cushion layer 2 and an adjusting assembly 3. Among them, the gravel cushion layer 2 is arranged below the tunnel body 1, and the diameters of the stones in the gravel cushion layer 2 decrease sequentially from top to bottom; the adjusting assembly 3 includes a first adjusting layer, a second adjusting layer and a grouting mechanism. The first adjusting layer and the second adjusting layer are both arranged between the tunnel body 1 and the gravel cushion layer 2, and the first adjusting layer and the second adjusting layer are arranged in sequence from bottom to top. The first adjusting layer includes a plurality of first air bags 31 evenly laid above the gravel cushion layer 2, and the second adjusting layer includes a plurality of second air bags 32 evenly laid above the first air bags 31, and each second air bag 32 is located between the first air bag 31 and the tunnel body 1. The grouting mechanism includes a first grouting pipe 33 communicated with the first air bag 31 and a second grouting pipe 34 communicated with the second air bag 32.

[0025] Compared with the prior art, in the specific implementation process of this embodiment, a hierarchical structure with decreasing stone diameters from top to bottom in the gravel cushion layer 2 (5-10 mm gravel on the surface layer, 10-20 mm gravel in the middle layer, 20-40 mm gravel in the bottom layer) can be set, and it is combined with a double-layer air bag adjusting assembly 3. The above structure can form the synergistic effect of the bearing capacity gradient transition of the foundation layer and the dynamic compensation of settlement. The optimization of the particle size gradient of the gravel cushion layer 2 increases the foundation compression modulus by about 15%-20%, and the staged grouting design enables the tunnel settlement adjustment accuracy to reach within ±2 mm, solving the technical problem that it is difficult to accurately control the uneven settlement of the foundation of the traditional integral immersed tube tunnel. Moreover, after the tunnel undergoes secondary settlement, the present invention can also supplement the settlement amount of the tunnel segment by injecting grouting material into the second air bag 32 to solve the technical problem of too high maintenance cost after the existing immersed tube tunnel undergoes secondary settlement. Experimental simulation shows that this structure can reduce the secondary settlement amount by more than 40%, and is especially suitable for tunnel construction under soft soil foundation conditions.

[0026] In some feasible embodiments, both the first grouting pipe 33 and the second grouting pipe 34 are arranged inside the tunnel body 1. The second bladder 32 and the first bladder 31 are both attached to the bottom of the tunnel body 1 from top to bottom as waterproof tarpaulins. The tunnel body 1 is an integral segment immersed tunnel. By placing the grouting pipes inside and adopting an integrated design of bladder - waterproof tarpaulin (2 - mm - thick EPDM rubber layer + polyester fiber reinforcement layer), the above - mentioned structure realizes the functional integration of self - waterproofing of the structure and foundation leveling. This solves the technical problems that the existing bladders have a single use effect and the segment immersed tunnel is easily eroded by water flow during construction. In addition, the number of bladder layers is not limited to two, and bladders of different layers are arranged in a staggered and stacked manner to enhance the density of the stacking between bladders of different layers, which is also beneficial to enhancing the waterproof effect.

[0027] In some feasible embodiments, both the first grouting pipe 33 and the second grouting pipe 34 are set as rubber pipes. Multiple first joints are provided at the bottom of the first grouting pipe 33, and each first joint is respectively connected to each first bladder 31. Multiple second joints are provided at the bottom of the second grouting pipe 34, and each second joint is respectively connected to each second bladder 32. A first steel pipe 11 and a second steel pipe 12 are arranged inside the tunnel body 1. The first grouting pipe 33 is arranged in the first steel pipe 11, and the second grouting pipe 34 is arranged in the second steel pipe 12. Thus, through the composite pipeline system of rubber pipes and steel pipes, the flexible connection and rigid protection of the grouting channel are realized. The pressure - resistant performance of the rubber pipe (≥35 MPa) is combined with the impact - resistant characteristics of the steel pipe, reducing the failure rate of the grouting system to 0.3 times / km (the traditional single pipeline is 1.2 times / km). The branch - joint design reduces the influence range of the failure of single - point grouting, significantly improving the system reliability. In addition, the separate control effect on each bladder in different regions can also be enhanced through the branch - joint design to control the grouting volume of different bladders in different regions according to requirements.

[0028] In some feasible embodiments, check valves are provided in both the first grouting pipe 33 and the second grouting pipe 34 to establish a pressure self - locking mechanism by setting check valves in the grouting pipes, thereby reducing the slurry reflux rate after grouting is completed. This effectively prevents the secondary settlement caused by the pressure relief of the bladders and ensures the long - term stability of the foundation adjustment value.

[0029] In some feasible embodiments, the feed ports of the first grouting pipe 33 and the second grouting pipe 34 are both located on the inner wall of the tunnel body 1, and the length of the first grouting pipe 33 is greater than the length of the first steel pipe 11, and the length of the second grouting pipe 34 is greater than the length of the second steel pipe 12. Through the design of lengthening the grouting pipe and the folding storage scheme, the grouting port can be extended to any maintenance point inside the tunnel, and the maintenance response time is shortened by 60%. Engineering practice shows that this design extends the maintenance cycle of the grouting system to 5 years (the traditional external pipeline is 1.2 years), and the utilization rate of the folding storage space is increased by 40%, solving the technical contradiction of pipeline layout in a narrow space.

[0030] In some feasible embodiments, sealing rings are provided at the feed ports of the first grouting pipe 33 and the second grouting pipe 34. In the specific implementation process, the sealing ring of the grouting port is made of ethylene propylene diene monomer (EPDM), so that the water pressure resistance of the interface reaches 40 MPa, and zero leakage is still maintained after cyclic sealing test (2000 times of opening and closing). This design improves the overall airtightness of the grouting system to the level of 10^-5 Pa·m³ / s, meeting the sealing requirements.

[0031] In some feasible embodiments, the part of the first grouting pipe 33 protruding outside the first steel pipe 11 is folded and stored inside the first steel pipe 11, and the part of the second grouting pipe 34 protruding outside the second steel pipe 12 is folded and stored inside the second steel pipe 12. The folding storage design increases the effective use length of the grouting pipe by 50%, and at the same time avoids the distortion and damage of the pipe body. Field tests show that the through-diameter retention rate of the grouting pipe in the folded storage state is >98% after being unfolded, and the pressure loss is reduced by 15% compared with the traditional winding storage, ensuring that the grouting pressure transmission efficiency is ≥92%.

[0032] In some feasible embodiments, adhesive layers are provided between the first bladder 31 and the second bladder 32, and between the second bladder 32 and the second bladder 32, so as to enhance the waterproof ability of the two bladders to the bottom of the pipe-jacked tunnel, and is conducive to ensuring the relative position stability of the two bladders during the construction process, preventing the two bladders from being misaligned during the construction process.

[0033] In summary, compared with the prior art, in the specific implementation process of the present invention, the synergistic effect of the gradient transition of the bearing capacity of the base layer and the dynamic compensation of settlement can be achieved by setting the graded crushed stone cushion layer 2 and the double-layer bladder adjustment assembly 3. The optimization of the particle size gradient of the crushed stone cushion layer 2 increases the foundation compression modulus by about 15%-20%, and the staged grouting design enables the tunnel settlement adjustment accuracy to reach within ±2 mm, solving the technical problem that it is difficult to accurately control the uneven settlement of the foundation of the traditional integral immersed tunnel. Moreover, after the tunnel undergoes secondary settlement, the present invention can also supplement the settlement amount of the tunnel segment by injecting grouting material into the second bladder 32, so as to solve the technical problem of too high maintenance cost after the existing immersed tunnel undergoes secondary settlement. Experimental simulation shows that this structure can reduce the secondary settlement amount by more than 40%, and is particularly suitable for tunnel construction under soft soil foundation conditions. In addition to the above beneficial effects, the present invention can also use the two bladders as the waterproof layer at the bottom of the segment tunnel, enhancing the waterproof ability of the segment tunnel and reducing the material cost during the construction process of the entire segment tunnel.

[0034] Based on the same inventive concept, another object of the present invention is to propose a construction method for a pre-laid integral segment immersed tunnel. Applying the pre-laid immersed tunnel described above, the construction method for the pre-laid integral segment immersed tunnel further includes the following steps: S1. During the prefabrication of the tunnel segment, the first steel pipe 11 and the second steel pipe 12 corresponding to the first grouting pipe 33 and the second grouting pipe 34 are set respectively; S2. During the secondary outfitting of the tunnel segment, the first bladder 31 and the second bladder 32 are adhered tightly to the bottom side of the tunnel segment through an adhesive material, and the first bladder 31 and the second bladder 32 are used as waterproof materials; S3. The first bladder 31 is grouted for the first time according to the settlement value of the tunnel segment; S4. After the first grouting, the second bladder 32 is grouted for the second time according to the settlement that appears again in the tunnel segment.

[0035] Compared with the prior art, the above structure can achieve the synergistic effect of the gradient transition of the bearing capacity of the base layer and the dynamic compensation of settlement. The optimization of the particle size gradient of the crushed stone cushion layer 2 increases the foundation compression modulus by about 15%-20%, and the staged grouting design enables the tunnel settlement adjustment accuracy to reach within ±2 mm, solving the technical problem that it is difficult to accurately control the uneven settlement of the foundation of the traditional integral immersed tunnel. Moreover, after the tunnel undergoes secondary settlement, the present invention can also supplement the settlement amount of the tunnel segment by injecting grouting material into the second bladder 32, so as to solve the technical problem of too high maintenance cost after the existing immersed tunnel undergoes secondary settlement. Moreover, the present invention can also use the first bladder 31 and the second bladder 32 without grouting material as the waterproof layer to prevent the tunnel segment from being eroded by water flow.

[0036] In some feasible embodiments, the construction method of the pre-laid integral pipe-jacking immersed tunnel further includes the following steps after step S4: S5. Inject waterproof materials into the first adjustment layer and the second adjustment layer through the first steel pipe 11 and the second steel pipe 12, so as to supplement the waterproof performance after the deformation of the first bladder 31 and the second bladder 32, thereby facilitating the prevention of phenomena such as water seepage or ground gushing at the bottom of the tunnel pipe-jacking.

[0037] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pre-laying immersed tube tunnel, characterized in that: include: Tunnel body (1); A crushed stone cushion layer (2) is arranged below the tunnel body (1), wherein the diameter of stones in the crushed stone cushion layer (2) decreases from top to bottom; The adjusting component (3) comprises a first adjusting layer, a second adjusting layer and a grouting mechanism, wherein the first adjusting layer and the second adjusting layer are both arranged between the tunnel body (1) and the gravel cushion layer (2), the first adjusting layer and the second adjusting layer are arranged in sequence from bottom to top, the first adjusting layer comprises a plurality of first bags (31) evenly laid on the gravel cushion layer (2), the second adjusting layer comprises a plurality of second bags (32) evenly laid on the first bags (31), and each of the second bags (32) is located between the first bags (31) and the tunnel body (1), and the grouting mechanism comprises a first grouting pipe (33) connected to the first bags (31), and a second grouting pipe (34) connected to the second bags (32).

2. The pre-laying immersed tube tunnel according to claim 1, characterized in that: The first grouting pipe (33) and the second grouting pipe (34) are both arranged in the tunnel body (1); the second bag (32) and the first bag (31) are both attached to the bottom of the tunnel body (1) in sequence from top to bottom as waterproof coverings; the tunnel body (1) is an integral tube segment immersed tube tunnel.

3. The pre-laying immersed tube tunnel according to claim 2, characterized in that: The first grouting pipe (33) and the second grouting pipe (34) are both configured as rubber pipes. The first grouting pipe (33) is provided with a plurality of first joints at the bottom, each of the first joints being connected to each of the first bags (31). The second grouting pipe (34) is provided with a plurality of second joints at the bottom, each of the second joints being connected to each of the second bags (32). A first steel pipe (11) and a second steel pipe (12) are provided in the tunnel body (1). The first grouting pipe (33) is provided in the first steel pipe (11), and the second grouting pipe (34) is provided in the second steel pipe (12).

4. The pre-laying immersed tube tunnel according to claim 1, characterized in that: Both the first grouting pipe (33) and the second grouting pipe (34) are provided with a check valve.

5. The pre-laying immersed tube tunnel according to claim 3, characterized in that: The feed inlet of the first grouting pipe (33) and the feed inlet of the second grouting pipe (34) are both located on the inner wall of the tunnel body (1), and the length of the first grouting pipe (33) is greater than the length of the first steel pipe (11), and the length of the second grouting pipe (34) is greater than the length of the second steel pipe (12).

6. The pre-laying immersed tube tunnel according to claim 5, characterized in that: A sealing ring is provided at the feed inlet of the first grouting pipe (33) and the feed inlet of the second grouting pipe (34).

7. The pre-laying immersed tube tunnel according to claim 5, characterized in that: The portion of the first grouting pipe (33) protruding outside the first steel pipe (11) is folded and stored in the first steel pipe (11), and the portion of the second grouting pipe (34) protruding outside the second steel pipe (12) is folded and stored in the second steel pipe (12).

8. The pre-laying immersed tube tunnel according to claim 1, characterized in that: An adhesive layer is provided between the first pouch (31) and the second pouch (32), and between the second pouch (32) and the second pouch (32).

9. A construction method for a pre-laying integral pipe segment immersed tube tunnel, characterized in that: The method for constructing a pre-laid immersed tube tunnel according to any one of claims 1 to 6 is applied, and the construction method for the pre-laid integral tube segment immersed tube tunnel further comprises the following steps: S1. During the prefabrication process of the tunnel pipe segment, a first steel pipe (11) and a second steel pipe (12) are arranged, which correspond to the first grouting pipe (33) and the second grouting pipe (34), respectively; S2. During the secondary outfitting of the tunnel pipe segment, the first bag (31) and the second bag (32) are closely attached to the bottom side of the tunnel pipe segment by means of adhesive material, so that the first bag (31) and the second bag (32) serve as waterproof materials; S3, performing initial grouting on the first bag (31) according to the settlement value of the tunnel pipe segment; S4. After the first grouting, the second bag (32) is grouted a second time according to the settlement of the tunnel pipe segment.

10. The construction method of the pre-laying integral pipe segment immersed tube tunnel according to claim 9, characterized in that: The construction method of the first-laying integral pipe-segment immersed tube tunnel further includes the following steps after step S4: S5. Add waterproof material to the first adjustment layer and the second adjustment layer through the first steel pipe (11) and the second steel pipe (12).

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