A large-section tunnel structure of bias close to a building in a soft stratum

Abstract

The application provides a large-section bias tunnel structure adjacent to a building in a soft stratum, comprising a bias tunnel section arranged on one side of the building, wherein the high-pressure side of the bias tunnel is arranged adjacent to and lower than the building, and the bias tunnel section comprises a bias hidden hole section and two bias open hole sections respectively connected to the two ends of the bias hidden hole section, each bias open hole section comprises an open hole inclined column and an open hole lining connected to each other, and the open hole inclined column and the open hole lining jointly enclose an annular support structure of the bias open hole section, the bias hidden hole section comprises a hidden hole inclined column, a hidden hole lining and a pre-advanced pipe curtain, the hidden hole inclined column is connected between the two open hole inclined columns, the hidden hole inclined column and the hidden hole lining jointly enclose an annular support structure, the pre-advanced pipe curtain is arranged between the high-pressure side of the bias tunnel section and the building, the pre-advanced pipe curtain extends along the extension direction of the tunnel and is connected between the two bias open hole sections. The application can effectively protect the safety and stability of the building adjacent to the tunnel on the basis of considering the safety of the tunnel.

Description

Technical Field

[0001] This invention relates to the field of tunnel technology, and in particular to a large-section tunnel structure with bias pressure in soft strata adjacent to buildings. Background Technology

[0002] In today's terrain with significant eccentricity, where one side is higher than the other, tunnels are often constructed to reduce road cut excavation (a special structure within open-cut tunnels). However, when the higher side of the tunnel is adjacent to a building (such as an important iron tower, ancient temple, or ancient building), the tunnel cannot be constructed by sloping and creating a tunnel. In such cases, the only option is to use a cut-and-cover tunnel to pass through the soft, eccentric strata adjacent to the building. However, the exposed tunnel structure on the lower side of the tunnel makes it difficult to construct a tunnel. Furthermore, when the tunnel has a large cross-section and is located in a soft stratum, conventional cut-and-cover structures, construction techniques, and advanced protection methods are clearly insufficient to ensure the stability of the tunnel and the building. Therefore, considering tunnel safety, economy, and lighting, it is particularly important to adopt a large-section cut-and-cover structure with inclined columns to pass through the section of the soft, eccentric strata adjacent to the building.

[0003] Therefore, it is necessary to propose a large-section tunnel structure with bias pressure in soft strata adjacent to buildings to solve or at least alleviate the above-mentioned defects. Summary of the Invention

[0004] The main objective of this invention is to provide a large-section tunnel structure with bias pressure in soft strata adjacent to buildings, in order to solve the problem that conventional tunnel excavation methods cannot ensure the stability of the tunnel and buildings when the high side of the bias pressure tunnel is adjacent to the building.

[0005] To achieve the above objectives, the present invention provides a biased large-section tunnel structure in soft strata adjacent to a building, comprising a biased tunnel section located on one side of the building, wherein the high-pressure side of the biased tunnel section is adjacent to and lower than the building, and the biased tunnel section includes a biased dark tunnel section and two biased open tunnel sections respectively connected to the two ends of the biased dark tunnel section; wherein,

[0006] Each biased open tunnel section includes interconnected open tunnel inclined columns and open tunnel linings; wherein, the open tunnel inclined columns are located on the low-pressure side of the biased open tunnel section, and the open tunnel inclined columns extend upward at an inclination toward the high-pressure side of the biased open tunnel section; one end of the open tunnel lining is connected to the high end of the open tunnel inclined column, and the other end of the open tunnel lining is connected to the low end of the open tunnel inclined column, and the open tunnel inclined columns and the open tunnel lining together form a ring-shaped support structure for the biased open tunnel section;

[0007] The biased tunnel section includes a tunnel inclined column, a tunnel lining, and an advanced pipe curtain; wherein, the tunnel inclined column is connected between two open tunnel inclined columns, the tunnel inclined column is located on the low-pressure side of the biased tunnel section, and the tunnel inclined column extends upward inclined towards the high-pressure side of the biased tunnel section; one end of the tunnel lining is connected to the high end of the tunnel inclined column, and the other end of the tunnel lining is connected to the low end of the tunnel inclined column, the tunnel inclined column and the tunnel lining together form a ring support structure; the advanced pipe curtain is located between the high-pressure side of the biased tunnel section and the building, the advanced pipe curtain extends along the tunnel extension direction and connects between the two biased open tunnel sections.

[0008] Preferably, the inclined column of the tunnel includes a tunnel foundation, an inclined column body, and a protective arch connected sequentially from bottom to top; the inclined column body extends obliquely upward from the tunnel foundation toward the high-pressure side of the biased tunnel section; the protective arch overlaps between the two biased open tunnel sections; the protective arch includes a first side and a second side arranged opposite to each other along the transverse direction of the tunnel, the first side is fixedly disposed on the top of the inclined column body, and the second side connects to the advanced pipe curtain from the first side along the transverse direction of the tunnel;

[0009] The lining of the tunnel includes an initial support and a secondary lining. One end of the initial support is connected to the second side of the protective arch. The secondary lining is located inside the initial support. One end of the secondary lining is connected to the high end of the inclined column body of the tunnel. The other end of the secondary lining is connected to the foundation of the tunnel. The foundation of the tunnel, the inclined column body of the tunnel, and the secondary lining together form a ring support structure.

[0010] Preferably, the tunnel lining includes a tunnel lining body and a supporting base. The tunnel lining body is located inside the supporting base. One end of the tunnel lining body is connected to the high end of the tunnel inclined column, and the other end of the tunnel lining body is connected to the low end of the tunnel inclined column.

[0011] The support base includes a first support portion and a second support portion located above the first support portion. The second support portion is disposed around the outside of the open-cut tunnel lining body. The first support portion supports the advanced pipe curtain on the side close to the open-cut tunnel lining body, and the second support portion supports the bottom of the advanced pipe curtain.

[0012] Preferably, the advanced pipe curtain includes multiple steel pipes arranged circumferentially along the tunnel, with a circumferential distance of 0.35m between two adjacent steel pipes, and the overlap length between the steel pipes and the open-cut lining is set to 3m.

[0013] Preferably, it also includes a slope grouting steel pipe group arranged in a quincunx pattern, the slope grouting steel pipe group being located on the high-pressure side of the biased open tunnel section, the slope grouting steel pipe group being used to reinforce the slope corresponding to the biased open tunnel section.

[0014] Preferably, it also includes an arch reinforcement mechanism located above the advanced pipe curtain. The arch reinforcement mechanism includes a first end and a second end arranged opposite to each other. The first end is fixedly connected to the first side of the arch, and the second end extends laterally from the first end along the tunnel to the slope corresponding to the biased dark tunnel section.

[0015] Preferably, the overlap length between the protective arch and the open-cut lining is set between 40 and 60 cm.

[0016] Preferably, the arch reinforcement mechanism is a grouting steel pipe, and a Larssen steel plate is installed above the grouting steel pipe to avoid the impact of the grouting steel pipe on the building during grouting.

[0017] Preferably, both the open-cut inclined column and the closed-cut inclined column are provided with pile foundations at their bottoms, and the pile foundations are embedded in the stable stratum at the bottom of the biased tunnel section to a depth of not less than 1m.

[0018] Preferably, PVC grouting pipes are used to grout the area where the advanced pipe curtain is located; wherein, the center-to-center distance between two adjacent PVC grouting pipes along the tunnel circumference is set to 100cm, and the center-to-center distance between two adjacent PVC grouting pipes along the tunnel radial direction is set to 150cm.

[0019] Compared with the prior art, the large-section tunnel structure with bias pressure in soft strata adjacent to buildings provided by the present invention has the following beneficial effects:

[0020] This invention provides a biased large-section tunnel structure in soft strata adjacent to a building, including a biased tunnel section located on one side of the building. The high-pressure side of the biased tunnel is adjacent to and lower than the building. The biased tunnel section includes a biased culvert section and two biased open tunnel sections respectively connected to the two ends of the biased culvert section. Each biased open tunnel section includes interconnected open tunnel inclined columns and open tunnel lining. The open tunnel inclined columns and open tunnel lining together form a ring support structure for the biased open tunnel section. The biased culvert section includes culvert inclined columns, culvert lining, and advance pipe curtain. The culvert inclined columns are connected between the two open tunnel inclined columns. The culvert inclined columns and culvert lining together form a ring support structure. The advance pipe curtain is located between the high-pressure side of the biased tunnel section and the building. The advance pipe curtain extends along the tunnel extension direction and connects between the two biased open tunnel sections.

[0021] This application, by constructing the biased tunnel section using inclined columns, tunnel lining, and advanced pipe roofing, effectively protects the safety and stability of adjacent structures while considering tunnel safety. By installing protective arches, with both ends overlapping the corresponding biased open tunnel sections, construction safety of the biased tunnel section is ensured, preventing collapse. Furthermore, the use of openwork inclined columns saves engineering materials while ensuring safety and improving tunnel lighting. Attached Figure Description

[0022] 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 the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic cross-sectional view of the biased open-cut section in one embodiment of the present invention;

[0024] Figure 2 This is a schematic cross-sectional view of the biased dark hole segment in one embodiment of the present invention;

[0025] Figure 3 This is one of the views of the self-biased dark hole segment toward the biased dark hole segment in one embodiment of the present invention;

[0026] Figure 4 This is a second view of the self-biased dark hole segment facing the biased dark hole segment in one embodiment of the present invention;

[0027] Figure 5 This is a cross-sectional schematic diagram of the overall structure along the longitudinal direction of the tunnel in one embodiment of the present invention.

[0028] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0029] Explanation of icon numbers:

[0030] 10. Building; 20. Tunnel section under bias pressure; 30. Dark tunnel section under bias pressure; 310. Inclined column of dark tunnel; 311. Foundation of dark tunnel; 312. Body of inclined column of dark tunnel; 313. Arch support; 320. Lining of dark tunnel; 321. Initial support; 322. Secondary lining; 330. Advanced pipe curtain; 40. Open tunnel section under bias pressure; 410. Inclined column of open tunnel; 422. Lining of open tunnel; 421. Body of lining of open tunnel; 422. Support base; 4221. First support part; 4222. Second support part; 50. Grouting steel pipe assembly; 510. Larssen steel plate; 60. Arch support reinforcement mechanism; 70. Pile foundation; 80. PVC grouting pipe. Detailed Implementation

[0031] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0034] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0035] Please see the appendix Figure 1-5An embodiment of the present invention provides a biased large-section tunnel structure in a soft stratum adjacent to a building 10, comprising a biased tunnel section 20 located on one side of the building 10. The high-pressure side of the biased tunnel section 20 is adjacent to and lower than the building 10. The biased tunnel section 20 includes a biased tunnel section 30 and two biased open tunnel sections 40 respectively connected to the two ends of the biased tunnel section 30. It is worth noting for those skilled in the art that in a large biased terrain with one side higher than the other, in order to reduce road cut excavation, a tunnel-type structure is often set up (a tunnel-type structure is a special structure in open tunnels). However, when the high side is adjacent to the building 10 (e.g., an iron tower, temple, or other important building 10), it is not possible to make a tunnel by shoveling the slope. In this case, only the method of tunnel excavation can be used. However, the tunnel structure on the low side is exposed and difficult to construct. In addition, when the tunnel is a large-section structure in a soft stratum, conventional tunnel structures, construction techniques, and advanced protection are obviously unable to ensure the stability of the tunnel and the building 10. This application proposes a biased large-section tunnel structure for soft strata adjacent to building 10, addressing this special but frequently encountered situation in tunnel engineering. The biased tunnel section 20 of this application includes a biased dark tunnel section 30 and two biased open tunnel sections 40 respectively connected to both ends of the biased dark tunnel section 30. That is, along the tunnel extension direction, the tunnel is divided into three sections in sequence: biased open tunnel section 40, biased dark tunnel section 30, and biased open tunnel section 40. In order to ensure the stability and safety of the structure and the construction safety of the tunnel, the biased dark tunnel section 30 of this application is set corresponding to the building 10, and then the biased open tunnel sections 40 are connected to both ends of the biased dark tunnel section 30.

[0036] In a specific example, the length of the biased open tunnel section 40 is 6m, and the length of the biased closed tunnel section 30 is 18m (3 x 6m). This setting is based on the length of the formwork trolley. The specific segment length can be determined according to the length of the formwork trolley. Furthermore, the total length of the biased closed tunnel section 30 can be adjusted according to the total length of the adjacent building.

[0037] Specifically, each biased open-cut section 40 includes interconnected open-cut inclined columns 410 and open-cut linings 420; wherein, the open-cut inclined columns 410 are located on the low-pressure side of the biased open-cut section 40, and the open-cut inclined columns 410 extend upwards at an inclination towards the high-pressure side of the biased open-cut section 40; one end of the open-cut lining 420 is connected to the high end of the open-cut inclined columns 410, and the other end of the open-cut lining 420 is connected to the low end of the open-cut inclined columns 410. The inclined columns 410 and the tunnel lining 420 together form a ring support structure for the biased tunnel section 40. It is worth noting that the biased tunnel section 40 of this application includes interconnected inclined columns 410 and tunnel lining 420. The use of inclined columns can reduce the cost of engineering materials while ensuring tunnel safety. Since the inclined columns 410 of this application are located on the low-pressure side of the biased tunnel section 40, hollow parts can be provided on the inclined columns to improve lighting performance.

[0038] The biased tunnel section 30 includes a tunnel inclined column 310, a tunnel lining 320, and an advanced pipe curtain 330; wherein, the tunnel inclined column 310 is connected between two open tunnel inclined columns 410, the tunnel inclined column 310 is located on the low-pressure side of the biased tunnel section 30, and the tunnel inclined column 310 extends upward inclined towards the high-pressure side of the biased tunnel section 30; one end of the tunnel lining 320 is connected to the high end of the tunnel inclined column 310, and the other end of the tunnel lining 320 is connected to the low end of the tunnel inclined column 310, the tunnel inclined column 310 and the tunnel lining 320 together form a ring support structure; the advanced pipe curtain 330 is located between the high-pressure side of the biased tunnel section 20 and the building 10, the advanced pipe curtain 330 extends along the tunnel extension direction and is connected between two biased open tunnel sections 40. It is worth noting that the biased tunnel section 30 of this application includes tunnel inclined columns 310, tunnel lining 320, and advanced pipe curtain 330. Using inclined columns can reduce engineering material costs while ensuring tunnel safety. Since the tunnel inclined columns 310 are located on the low-pressure side of the biased open tunnel section 40, perforations can be provided on the inclined columns to improve lighting performance. In a preferred embodiment, the open tunnel inclined columns 410 and the tunnel inclined columns 310 can be integrated, meaning that the inclined columns of the entire tunnel section of this application are constructed as a single unit during the construction of the inclined columns.

[0039] Furthermore, grouting pipes can be used to reinforce the foundation of the biased dark tunnel section 30 and the biased open tunnel section 40 to ensure that the bearing capacity of the foundation meets the requirements. Preferably, the diameter of the grouting pipes used is 50mm.

[0040] In a preferred embodiment of the present invention, the inclined column 310 of the hidden cavity includes a hidden cavity foundation 311, a hidden cavity inclined column body 312, and a protective arch 313 connected sequentially from bottom to top; the inclined column body 312 extends obliquely upward from the hidden cavity foundation 311 toward the high-pressure side of the biased hidden cavity section 30; it is worth noting for those skilled in the art that the inclined column 310 of the hidden cavity in this embodiment includes a hidden cavity foundation 311, a hidden cavity inclined column body 312, and a protective arch 313 connected sequentially from bottom to top, the hidden cavity foundation 311... 11 is used for basic support, such as a foundation or other structure. The inclined column body 312 of the tunnel can be set as a single piece or as a hollow structure. When the inclined column body 312 of the tunnel is set as a hollow structure, that is, the inclined column body 312 of the tunnel has multiple hollow parts along the tunnel extension direction. This structural form can save engineering materials and improve the tunnel's lighting while ensuring tunnel safety (the tunnel in this application is a biased tunnel, and the hollow parts are located on the low-pressure side of the tunnel, allowing external light to enter the tunnel interior through the hollow parts). The protective arch 313 overlaps between the two biased open tunnel sections 40.

[0041] The arch support 313 includes a first side (not shown) and a second side (not shown) arranged laterally along the tunnel. The first side is fixed to the top of the inclined column body 312 of the tunnel. The second side connects to the advanced pipe curtain 330 from the first side along the tunnel. The tunnel lining 320 includes an initial support 321 and a secondary lining 322. One end of the initial support 321 is connected to the second side of the arch support 313. The secondary lining 322 is located inside the initial support 321. One end of the secondary lining 322 is connected to the high end of the inclined column body 312 of the tunnel. The other end of the secondary lining 322 is connected to the tunnel foundation 311. The tunnel foundation 311, the inclined column body 312 of the tunnel, and the secondary lining 322 together form a ring support structure.

[0042] It is important to note that the arch support 313 enhances the construction stability and safety of the biased tunnel section 30. Specifically, the first side of the arch support 313 is fixed to the top of the inclined column body 312 of the tunnel, and the second side connects to the advanced pipe curtain 330 transversely along the tunnel from the first side. Furthermore, both ends of the arch support 313 along the tunnel extension direction overlap the support structure of the biased open tunnel section 40. This demonstrates that the construction of the arch support 313 can utilize the previously constructed biased open tunnel section 40 for support, thus improving the safety of the arch support 313 construction. By connecting both ends and the first side of the arch support 313 to the corresponding support structures, the structural strength and stability of the arch support 313 are significantly improved, thereby ensuring the construction safety of the biased tunnel section 30 and enhancing the protection of adjacent buildings.

[0043] In a preferred embodiment of the present invention, the tunnel lining 420 includes a tunnel lining body 421 and a support base 422. The tunnel lining body 421 is located inside the support base 422. One end of the tunnel lining body 421 is connected to the high end of the tunnel inclined column 410, and the other end of the tunnel lining body 421 is connected to the low end of the tunnel inclined column 410. The support base 422 includes a first support portion 4221 connected to each other and a second support portion 4222 located above the first support portion 4221. The second support portion 4222 is arranged around the outside of the tunnel lining body 421. The first support portion 4221 is supported on the side of the advanced tube curtain 330 near the tunnel lining body 421, and the second support portion 4222 is supported on the bottom of the advanced tube curtain 330. It is noteworthy that the support base 422 in this embodiment includes a first support portion 4221 connected to each other and a second support portion 4222 located above the first support portion 4221. That is, the support base 422 is configured in two sections, upper and lower. The support base 422 and the advanced pipe curtain 330 are correspondingly arranged, with the first support portion 4221 supporting the advanced pipe curtain 330 on the side near the open-cut lining body 421, and the second support portion 4222 supporting the bottom of the advanced pipe curtain 330. In actual construction, the lower end of the advanced pipe curtain 330 can be placed on top of the second support portion 4222, and the first support portion 4221 can support the advanced pipe curtain 330 on the side near the open-cut lining body 421 to support the entire advanced pipe curtain 330. By setting the support base 422, the pipe curtain subsidence can be effectively prevented, ensuring good support capacity of the advanced pipe curtain 330, thereby ensuring the safety of the adjacent building 10.

[0044] Furthermore, the advanced pipe jacking 330 comprises multiple steel pipes arranged circumferentially along the tunnel, with a circumferential spacing of 0.35m between adjacent steel pipes, and an overlap length of 3m between the steel pipes and the open-cut lining 420. It should be noted that in this embodiment, the advanced pipe jacking 330 is formed by multiple steel pipes sequentially connected circumferentially along the tunnel, with adjacent steel pipes connected by interlocking fasteners (not shown in the figure), a circumferential spacing of 0.35m between adjacent steel pipes, and an overlap length of 3m between the steel pipes and the open-cut lining 420. It is understood that in other embodiments, those skilled in the art can set the circumferential spacing between adjacent steel pipes and the overlap length between the steel pipes and the open-cut lining 420 according to actual needs.

[0045] As a preferred embodiment, the system further includes slope grouting steel pipe groups 50 arranged in a quincunx pattern. These groups are located on the high-pressure side of the biased open tunnel section 40 and are used to reinforce the slope corresponding to the biased open tunnel section 40. Those skilled in the art will understand that by constructing the slope grouting steel pipe groups 50 arranged in a quincunx pattern on the high-pressure side of the biased open tunnel section 40, with the groups located between the building 10 and the biased open tunnel section 40, in one specific embodiment, the slope grouting steel pipes in the group 50 have a diameter of 50mm, are inserted into the slope to a depth of 6m, and the spacing between multiple slope grouting steel pipe groups 50 is set to 1.2m x 1.2m. By setting up slope grouting steel pipe groups 50 arranged in a plum blossom pattern, the slope corresponding to the biased open tunnel section 40 can be reinforced, thereby improving the safety of tunnel construction.

[0046] As another preferred embodiment, an arch reinforcement mechanism 60 is also included above the advanced pipe curtain 330. The arch reinforcement mechanism 60 includes a first end (not shown in the figure) and a second end (not shown in the figure) arranged opposite to each other. The first end is fixedly connected to the first side of the arch 313, and the second end extends laterally from the first end along the tunnel to the slope corresponding to the biased tunnel section 30. It should be noted that the arch reinforcement mechanism 60 can further reinforce the arch 313. Spatially, the two ends of the arch 313 along the tunnel extension direction respectively overlap the corresponding open-cut lining 420. In the actual construction process, the biased open-cut section 40 is constructed before the biased tunnel section 30. In this way, the tunnel support structure constructed earlier can be used to support the arch 313 structure constructed later. At the same time, the first side of the arch 313 (i.e., Figure 2 The second side of the arch 313 extends laterally from the first end along the tunnel to the slope corresponding to the biased dark tunnel section 30, that is, it is arranged laterally along the tunnel. By connecting the second side of the arch 313 to the arch reinforcement mechanism 60, the arch 313 can be supported in all directions, and the overall structural strength of the arch 313 is further improved to ensure the safety of the construction of the biased dark tunnel section 30 and prevent the biased dark tunnel section 30 from collapsing.

[0047] Furthermore, the arch reinforcement mechanism 60 is a grouting steel pipe, and a Larssen steel plate 510 is installed above the grouting steel pipe to avoid the impact of the grouting steel pipe on the building 10 during grouting. When the arch reinforcement mechanism 60 is a grouting steel pipe, those skilled in the art know that the grouting steel pipe has a certain grouting pressure during grouting, which can easily affect the building 10, especially when the grouting pressure is high and the surrounding geology is soft. Therefore, in this embodiment, a Larssen steel plate 510 is installed above the grouting steel pipe. The Larssen steel plate 510 has advantages such as high quality, simple construction, shortened construction period, and good durability. Preferably, the Larssen steel plate 510 is a Type III Larssen steel plate 510. It should be noted that the Larssen steel plate 510 is inserted along the slope to the bottom of the building 10, separating the building 10 on the slope and the tunnel located below the side of the building 10 as much as possible.

[0048] In a preferred embodiment, the grouting steel pipe is a grouting steel pipe with a diameter of 108mm and a wall thickness of 6mm, and each grouting steel pipe is inserted into the slope to a depth of 10m.

[0049] Furthermore, the overlap length between the arch support 313 and the open-cut lining 420 is set between 40 and 60 cm. It is understood that in other embodiments, the overlap length between the arch support 313 and the open-cut lining 420 can be set to other values. By overlapping the arch support 313 with the open-cut lining 420, the previously constructed open-cut section can be fully utilized for support, thereby improving the safety of the construction of the biased dark tunnel section 30, and further improving the safety of tunnel construction and increasing the protection of adjacent structures 10.

[0050] Preferably, both the inclined columns of the open tunnel and the inclined columns of the closed tunnel are provided with pile foundations 70 at their bottoms, and the pile foundations 70 are embedded in the stable stratum at the bottom of the biased tunnel section 20 to a depth of not less than 1m. The stable stratum can be one or more of moderately weathered rock strata, or completely weathered and strongly weathered rock strata, thereby further improving the integrity and stability of the entire tunnel structure.

[0051] Preferably, PVC grouting pipes 80 are used to grout the area where the advanced pipe curtain 330 is located; wherein, the center-to-center distance between two adjacent PVC grouting pipes 80 along the tunnel circumference is set to 100cm, and the center-to-center distance between two adjacent PVC grouting pipes 80 along the tunnel radial direction is set to 150cm. By grouting the area where the advanced pipe curtain 330 is located, the safety and stability of the surrounding rock can be ensured during the excavation of the biased tunnel section 30.

[0052] For example, the present invention also provides a method for constructing a large-section tunnel under biased pressure in soft strata adjacent to a building, applicable to the aforementioned large-section tunnel structure under biased pressure in soft strata adjacent to a building, comprising the following steps:

[0053] S1, first carry out the construction of the biased open tunnel section 40:

[0054] S11, the entrance of the biased open tunnel section 40 is sloped and a drainage ditch is constructed;

[0055] S12, construct the pile foundation 70 and the pile cap of the entire biased tunnel section 20;

[0056] S13, Construct the tunnel inclined columns for the entire biased tunnel section 20; the tunnel inclined columns include the open-cut inclined column 410 and the closed-cut inclined column 310, and the open-cut inclined column 410 and the closed-cut inclined column 310 are connected along the tunnel extension direction;

[0057] S14, construct the inverted arch of the biased tunnel section 40;

[0058] S15, construct the lining of the upper part of the biased open tunnel section 40; wherein, the open tunnel lining 420 mentioned above includes the inverted arch part and the lining part of the upper part of the biased open tunnel section 40.

[0059] S16, Construct an advanced tube curtain 330;

[0060] S2, construction of the biased dark tunnel section 30:

[0061] S21, construct the arch support 313 and Larssen steel plate 510 for the biased dark tunnel section 30;

[0062] S22, the upper and lower bench method is used for excavation and initial support is implemented 321, and the advance is controlled at 1m;

[0063] S23, construct the invert arch with secondary lining 322;

[0064] S24, the superstructure for which secondary lining 322 is constructed.

[0065] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A large-section tunnel structure with bias pressure in soft strata adjacent to a building, characterized in that, The system includes a biased tunnel section located on one side of the building, with the high-pressure side of the biased tunnel section adjacent to and lower than the building. The biased tunnel section comprises a biased concealed tunnel section and two biased open tunnel sections respectively connecting the two ends of the biased concealed tunnel section. Each biased open tunnel section includes interconnected open tunnel inclined columns and open tunnel linings; wherein, the open tunnel inclined columns are located on the low-pressure side of the biased open tunnel section, and the open tunnel inclined columns extend upward at an inclination toward the high-pressure side of the biased open tunnel section; one end of the open tunnel lining is connected to the high end of the open tunnel inclined column, and the other end of the open tunnel lining is connected to the low end of the open tunnel inclined column, and the open tunnel inclined columns and the open tunnel lining together form a ring-shaped support structure for the biased open tunnel section; The biased tunnel section includes inclined columns, tunnel lining, and pre-jacking pipe curtain; wherein, the inclined columns are connected between two open tunnel inclined columns, the inclined columns are located on the low-pressure side of the biased tunnel section, and the inclined columns extend upwards at an inclination towards the high-pressure side of the biased tunnel section; one end of the tunnel lining is connected to the high end of the inclined columns, and the other end of the tunnel lining is connected to the low end of the inclined columns, the inclined columns and the tunnel lining together forming a ring support structure; the pre-jacking pipe curtain is located between the high-pressure side of the biased tunnel section and the building, the pre-jacking pipe curtain extends along the tunnel extension direction and connects between the two biased open tunnel sections; The inclined column of the tunnel includes a tunnel foundation, an inclined column body, and a protective arch connected sequentially from bottom to top; the inclined column body extends obliquely upward from the tunnel foundation toward the high-pressure side of the biased tunnel section; the protective arch overlaps between the two biased open tunnel sections; the protective arch includes a first side and a second side arranged opposite to each other along the transverse direction of the tunnel, the first side is fixed to the top of the inclined column body, and the second side connects to the advanced pipe curtain along the transverse direction of the tunnel from the first side; The lining of the tunnel includes an initial support and a secondary lining. One end of the initial support is connected to the second side of the protective arch. The secondary lining is located inside the initial support. One end of the secondary lining is connected to the high end of the tunnel inclined column body. The other end of the secondary lining is connected to the tunnel foundation. The tunnel foundation, the tunnel inclined column body, and the secondary lining together form a ring support structure. The tunnel lining includes a tunnel lining body and a supporting base. The tunnel lining body is located inside the supporting base. One end of the tunnel lining body is connected to the high end of the tunnel inclined column, and the other end of the tunnel lining body is connected to the low end of the tunnel inclined column. The support base includes a first support portion and a second support portion located above the first support portion. The second support portion is disposed around the outside of the open-cut tunnel lining body. The first support portion supports the advanced pipe curtain on the side close to the open-cut tunnel lining body, and the second support portion supports the bottom of the advanced pipe curtain.

2. The large-section tunnel structure with bias pressure in soft strata adjacent to buildings according to claim 1, characterized in that, The advanced pipe curtain includes multiple steel pipes arranged circumferentially along the tunnel, with a circumferential spacing of 0.35m between two adjacent steel pipes, and the overlap length between the steel pipes and the open-cut lining is set to 3m.

3. The large-section tunnel structure with bias pressure in soft strata adjacent to buildings according to claim 1, characterized in that, It also includes slope grouting steel pipe groups arranged in a plum blossom pattern. The slope grouting steel pipe groups are located on the high-pressure side of the biased open tunnel section and are used to reinforce the slope corresponding to the biased open tunnel section.

4. The large-section tunnel structure with bias pressure in soft strata adjacent to buildings according to claim 1, characterized in that, It also includes an arch reinforcement mechanism located above the advanced tube curtain. The arch reinforcement mechanism includes a first end and a second end arranged opposite to each other. The first end is fixedly connected to the first side of the arch, and the second end extends laterally from the first end along the tunnel to the slope corresponding to the biased dark tunnel section.

5. The large-section tunnel structure with bias pressure in soft strata adjacent to buildings according to claim 4, characterized in that, The overlap length between the arch support and the tunnel lining is set between 40 and 60 cm.

6. The large-section tunnel structure with bias pressure in soft strata adjacent to buildings according to claim 4, characterized in that, The arch reinforcement mechanism is a grouting steel pipe, and a Larssen steel plate is installed above the grouting steel pipe to avoid the impact of the grouting steel pipe on the building during grouting.

7. The large-section tunnel structure with bias pressure in soft strata adjacent to buildings according to claim 1, characterized in that, Both the open-cut inclined column and the closed-cut inclined column are equipped with pile foundations at their bottoms, and the pile foundations are embedded in the stable stratum at the bottom of the biased tunnel section to a depth of not less than 1m.

8. The large-section tunnel structure with bias pressure in soft strata adjacent to buildings according to any one of claims 1-7, characterized in that, PVC grouting pipes are used to grout the area where the advanced pipe curtain is located; wherein, the center-to-center distance between two adjacent PVC grouting pipes along the tunnel circumference is set to 100cm, and the center-to-center distance between two adjacent PVC grouting pipes along the tunnel radial direction is set to 150cm.

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