Tunnel excavation supporting structure for water diversion project

Abstract

The utility model relates to the technical field of tunnel excavation supporting structure design and construction, in particular to a tunnel excavation supporting structure for water diversion engineering, which comprises a first supporting assembly for supporting an inlet of a tunnel and a second supporting assembly for supporting a tunnel body and an outlet of the tunnel, and the first supporting assembly is square and comprises a supporting part and a blocking part; the second supporting assembly is arranged in an arch shape and is composed of a plurality of protection parts, side protection parts and a bottom supporting part, and the water flow guiding function is achieved through the water diversion assembly. In addition, water stopping parts are arranged at the joints of all the components so as to enhance the sealing performance. The effects of improving the stability and safety of the supporting structure and optimizing the water diversion efficiency are achieved, and the water diversion engineering construction requirements under the complex geological conditions are met.

Description

Technical Field

[0001] This application relates to the field of tunnel excavation support structure design and construction technology, and in particular to a tunnel excavation support structure for water diversion projects. Background Technology

[0002] With rapid socio-economic development, water diversion projects are increasing, especially tunnel projects constructed in complex terrain conditions such as mountains and underground, which have gradually become a research hotspot. These projects place extremely high demands on timely support after tunnel excavation to prevent collapse accidents and ensure the safety of construction workers and the quality of the project.

[0003] Currently, commonly used tunnel excavation support methods mainly include shotcrete support, anchor bolt reinforcement, and steel arch support. Shotcrete support features rapid setting and hardening, effectively sealing surface cracks in the surrounding rock and reducing weathering and spalling; however, its thickness is limited and it is prone to peeling and detachment. Anchor bolt reinforcement enhances the overall stability of the slope by penetrating deep into the strata; however, the installation process is cumbersome and time-consuming, and improper drilling depth can lead to localized stress concentration, causing new safety hazards. Steel arch support relies on its high rigidity to directly bear external loads; while offering high safety, its large weight increases transportation and handling difficulties, and its high cost hinders large-scale adoption. These conventional methods each have their advantages but also unavoidable problems, thus urgently requiring the development of more advanced and rational new support methods.

[0004] Existing mainstream support measures generally suffer from problems such as low construction efficiency, poor economic benefits, or narrow applicability. This is particularly evident in weak and fractured zones, areas with abundant groundwater, and other harsh natural environments, where insufficient support strength or even failure often occurs, threatening the normal progress of the entire project. Utility Model Content

[0005] To address the issue of low reliability and durability of tunnel excavation support structures under complex geological conditions, this application provides a tunnel excavation support structure for water diversion projects.

[0006] This application provides a tunnel excavation support structure for water diversion projects, employing the following technical solution:

[0007] A tunnel excavation support structure for a water diversion project includes a first support component for supporting the tunnel inlet and a second support component for supporting the tunnel body and outlet.

[0008] The first support component is square in shape;

[0009] The second support component is arched in shape;

[0010] Water intake components are provided on the first support assembly and the second support assembly, respectively.

[0011] By adopting the above technical solutions, the first support component is square-shaped, which can stably support the tunnel entrance area, forming a strong compressive strength and effectively preventing collapse in this area. The second support component is arch-shaped, utilizing the mechanical properties of the arch structure to reasonably distribute the load pressure on the tunnel body and exit, improving the overall structural stability and enhancing the stability and safety of the support structure during the pouring process. Simultaneously, water diversion components are installed on both the first and second support components to efficiently guide water flow out, avoiding instability problems in weak and fractured zones caused by groundwater seepage, and significantly improving the reliability and durability of the support structure under complex geological conditions.

[0012] Preferably, the first support component includes a support part and a barrier part. The support part is fixedly installed on the ground, and the barrier part is installed on the support part. The barrier part is arranged in a square shape and / or an arch shape with the main frame.

[0013] By adopting the above technical solution, the support unit is fixedly installed on the ground, providing a stable foundation for the entire support structure, enhancing its stability, and effectively preventing support failure caused by uneven ground settlement. The retaining element is installed on top of the support unit, forming a square or arched structure with the main frame. This not only improves the overall strength of the support structure but also better adapts to the stress requirements under different geological conditions. The square design is suitable for regular, flat areas, while the arched design helps to distribute pressure, exhibiting superior load-bearing capacity in complex terrain.

[0014] Preferably, the second support component includes a first protective part, a first side protective part, and a first bottom support part. The first bottom support part is fixed to the ground. One end of the first protective part is connected to the first bottom support part. One end of the first side protective part is connected to the first protective part, and the other end is connected to the cave.

[0015] By adopting the above technical solution, the second support component consists of a first retaining section, a first side retaining section, and a first bottom support section, forming a stable arched structure. The first bottom support section is fixed to the ground, providing a solid foundation for the entire support structure; the first retaining section is connected to the first bottom support section, playing a major load-bearing role while also resisting pressure from above; the first side retaining sections are connected to the first retaining section and the tunnel body respectively, playing a key role in ensuring the lateral stability of the structure. This design enables the rapid establishment of a stable and reliable initial support system after tunnel excavation, effectively avoiding the risk of collapse, while improving construction efficiency and reducing costs.

[0016] Preferably, the second support assembly further includes a second protective section and a second side protective section. One end of the second protective section is connected to the first protective section, one end of the second side protective section is connected to the second protective section, and the other end is connected to the cavity. One side of the second side protective section is connected to the first side protective section.

[0017] By adopting the above technical solution, a multi-layered protective structure can be further added to the first protective layer, including a second protective layer and a second side protective layer. The second protective layer connects to the first protective layer, enhancing the overall stability of the support structure and improving the pressure dispersion capacity on the top and sides of the tunnel. The second side protective layer not only connects to the second protective layer but also to the tunnel body and the first side protective layer, forming a more compact and reliable enclosed support system. This effectively avoids the risk of deformation or collapse caused by excessive local stress on the support structure during the pouring process. Simultaneously, this multi-level design allows the support structure to adapt to more complex geological conditions, exhibiting higher reliability and durability in weak, fractured zones or environments rich in groundwater.

[0018] Preferably, the first protective part and the first side protective part are provided in at least two sets, and the second protective part and the second side protective part are provided in at least two sets.

[0019] By adopting the above technical solutions, the stability and reliability of the support structure can be significantly improved during tunnel excavation and support. Specifically, the first and second support components respectively undertake the different support needs of the tunnel inlet and outlet, while working in conjunction with the water diversion components to effectively manage water flow, thereby reducing the risk of support failure due to abundant groundwater. Setting up multiple sets of first support sections and first side support sections can enhance the support capacity of the tunnel top and sides, thereby improving the stability and safety of the support structure during the pouring process.

[0020] Preferably, the water intake assembly includes a through section and a guide section, with the guide section passing through the first support assembly and the second support assembly respectively; the through section is connected to the tunnel body by passing through the guide section and the first support assembly in sequence, and / or is connected to the tunnel body by passing through the guide section and the second support assembly in sequence.

[0021] By adopting the above technical solutions, the water diversion components can effectively guide and discharge water flow, avoiding erosion and damage to the supporting structure caused by water accumulation, and improving the durability and stability of the supporting structure under complex geological conditions. Specifically, the coordinated design of the through section and the guiding section allows water to flow smoothly within the support structure and ultimately be discharged outside the tunnel, effectively mitigating the adverse effects of areas rich in groundwater.

[0022] Preferably, a first water-stopping part is provided at the connection between the first protective part and the second protective part, and the first water-stopping part is fixed in the gap between the first protective part and the second protective part.

[0023] By adopting the above technical solution, the first water-stopping part can effectively seal the gap at the connection between the first and second protective parts, preventing water from seeping into the interior of the support structure, thereby improving the sealing and stability of the support structure in environments with abundant groundwater or humid conditions.

[0024] Preferably, a second water-stopping part is provided at the connection between the first side guard and the second side guard, and the second water-stopping part is fixed in the gap between the first side guard and the second side guard.

[0025] By adopting the above technical solution, the second water-stop at the connection between the first and second side protection sections effectively fills the gap between them, preventing moisture from seeping into the tunnel interior and improving the waterproof performance and overall stability of the support structure. The addition of the second water-stop significantly enhances the waterproofing effect at the connection point, ensuring the safe and reliable operation of the support structure during tunnel excavation.

[0026] In summary, this application has the following beneficial effects:

[0027] 1. The combined design of the first and second support components can adapt to the needs of different parts of the tunnel, improving the reliability and durability of the support structure under complex geological conditions;

[0028] 2. The installation of water diversion components helps to channel groundwater, reduce the impact of groundwater on the support structure, and further improve the stability and safety of the support system;

[0029] 3. The design of multiple sets of retaining walls and side retaining walls enhances the overall strength of the support structure and effectively solves the problem of insufficient strength of traditional support methods under geological conditions such as weak and fractured zones. Attached Figure Description

[0030] Figure 1 This embodiment discloses a structural view of the first support component in a tunnel excavation support structure for a water diversion project;

[0031] Figure 2 This embodiment discloses a structural view of the second support component in a tunnel excavation support structure for a water diversion project;

[0032] Figure 3 This is a structural view of the first water-stopping part in a tunnel excavation support structure for a water diversion project disclosed in this embodiment.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. First support assembly; 11. Support part; 12. Barrier part; 2. Second support assembly; 21. First protection part; 22. First side protection part; 23. First bottom support part; 24. Second protection part; 25. Second side protection part; 3. Water diversion assembly; 31. Through part; 32. Guide part; 4. First water stop part. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only possible technical implementations of the present invention and not all possible implementations. Those skilled in the art can obtain other embodiments in conjunction with the embodiments of the present invention without creative effort, and these embodiments are also within the protection scope of the present invention.

[0037] The low reliability and durability of tunnel excavation support structures under complex geological conditions seriously affect construction progress and quality. Therefore, this application mainly adopts the following scheme, which significantly improves the reliability and adaptability of the support structure. A further detailed description of this application follows.

[0038] The tunnel excavation support structure for water diversion projects provided in this application includes a first support component 1 supporting the tunnel inlet and a second support component 2 supporting the tunnel body and outlet. The first support component 1 is square in shape and is used for initial protection of the tunnel inlet and outlet areas; the second support component 2 is arched and is suitable for long-term support of the main body of the tunnel. Water diversion components 3 are respectively provided on the first support component 1 and the second support component 2 to enhance the overall stability and durability of the support system and to facilitate water diversion.

[0039] Specifically, the first support component 1 includes a support section 11 and a barrier section 12. The support section 11 is made of high-strength steel structure and is fixed to the ground at the bottom by bolts, serving as the foundation load-bearing component. The barrier section 12 is installed on the support section 11 and is usually made of steel mesh or other flexible materials spliced ​​together. The support section 11 and the barrier section 12 are connected by means of rivets or other methods. The support section 11 can be made of steel sheet piles or precast concrete columns, which share the characteristics of having sufficient bending resistance and good insertion and extraction performance to facilitate on-site assembly and disassembly.

[0040] The barrier section 12 can be made of a large-area filter cloth woven from double or multiple layers of mesh metal wire to wrap the internal filling material and form an integral unit block before being hoisted into place.

[0041] The second support assembly 2 includes a first protective part 21, a first side protective part 22 and a first bottom support part 23. One end of the second protective part 24 is connected to the first protective part 21. One end of the second side protective part 25 is connected to the second protective part 24 and the other end is connected to the hole. One side of the second side protective part 25 is connected to the first side protective part 22.

[0042] The first bottom support 23 is made of high-strength steel structure and is fixed to the ground at the bottom by bolts, which serves as the foundation load-bearing function. The first protective part 21 and the first side protective part 22 are also made of high-strength steel structure and are connected and supported to the tunnel body by anchor rods. The first protective part 21 and the first side protective part 22 are connected and fixed by bolts.

[0043] The second support assembly 2 also includes a second protective part 24 and a second side protective part 25. One end of the second protective part 24 is connected to the first protective part 21, one end of the second side protective part 25 is connected to the second protective part 24, the other end is connected to the cavity, and one side of the second side protective part 25 is connected to the first side protective part 22.

[0044] The second protective section 24 and the second side protective section 25 are also made of high-strength steel structures and are connected and supported to the tunnel body by anchor bolts. The second protective section 24 and the second side protective section 25, the second protective section 24 and the first protective section 21, and the second side protective section 25 and the first side protective section 22 are respectively connected and fixed by bolts.

[0045] At least two sets of the first protective part 21 and the first side protective part 22 are provided, and at least two sets of the second protective part 24 and the second side protective part 25 are provided. In this embodiment, the first protective part 21 and the first side protective part 22 are each provided with two sets, and the second protective part 24 and the second side protective part 25 are each provided with two sets.

[0046] Specifically, the two sets of first protective parts 21 and first side protective parts 22 are respectively installed on the side walls at both ends of the tunnel body, and the second protective parts 24 and the second side protective parts 25 are respectively arc-shaped steels, and the two sets of second protective parts 24 and the second side protective parts 25 are joined together to form an arch shape.

[0047] A first water-stopping part 4 is provided at the connection between the first protective part 21 and the second protective part 24, and the first water-stopping part 4 is fixed in the gap between the first protective part 21 and the second protective part 24.

[0048] The first water-stopping part 4 is specifically a rubber gasket, which can be a sealing strip in other embodiments, thereby providing waterproof isolation between adjacent modules to achieve stable and sealed support.

[0049] A second water-stopping part (not shown in the figure) is provided at the connection between the first side guard 22 and the second side guard 25. The second water-stopping part is fixed in the gap between the first side guard 22 and the second side guard 25.

[0050] The second water-stopping part is also a rubber gasket, and in other embodiments it can also be a sealing strip, thereby waterproofing and isolating adjacent modules to achieve stable and sealed support.

[0051] The water intake component 3 includes a through section 31 and a guide section 32. The guide section 32 is respectively inserted into the first support component 1 and the second support component 2. The through section 31 is connected to the tunnel body by sequentially inserting the guide section 32 and the first support component 1, and / or sequentially inserting the guide section 32 and the second support component 2.

[0052] The guide section 32 has a pre-embedded path and is supported and fixed by anchor bolts; the passage section 31 is specifically a water pipe; the passage section 31 is responsible for transporting water from various directions into the guide section 32 and collecting the water flow. The guide section 32 specifically consists of two semi-circular steel structures (not shown in the figure) and two joint-seam dismantling steel bars (not shown in the figure). The two semi-circular steel structures are fixed by anchor bolts, and the two joint-seam dismantling steel bars are installed at the connection points at both ends of the two semi-circular steel structures and connected by bolts. Thus, after the concrete in the gap between the guide section 32 and the square frame and / or arch frame is poured and formed, the two joint-seam dismantling steel bars can be detached, allowing for rapid demolding of the two semi-circular steel structures.

[0053] The implementation principle of this embodiment is as follows:

[0054] The first support component 1 of the tunnel entrance section is supported, and the gap between the first support component 1 and the tunnel body is poured to form the wall of the tunnel entrance section.

[0055] The second support component 2 is used to support the tunnel body and the exit section. The gap between the second support component 2 and the tunnel body is poured to form the wall of the tunnel body and the exit section.

[0056] The support and guiding components are embedded with the through part 31 and the support and guiding part 32, and then poured and demolded after molding.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A tunnel excavation support structure for a water diversion project, characterized by: It includes a first support component (1) for supporting the tunnel inlet and a second support component (2) for supporting the tunnel body and outlet; The first support component (1) is square in shape; The second support component (2) is arched; Water intake components (3) are respectively provided on the first support component (1) and the second support component (2).

2. The tunnel excavation support structure for water diversion works according to claim 1, characterized by: The first support component (1) includes a support part (11) and a barrier part (12). The support part (11) is fixedly installed on the ground, and the barrier part (12) is installed on the support part (11). The barrier part (12) is square and / or arched with the main frame.

3. The tunnel excavation support structure for a water diversion project according to claim 2, characterized by: The second support assembly (2) includes a first support (21), a first side support (22) and a first bottom support (23). The first bottom support (23) is fixed to the ground. One end of the first support (21) is connected to the first bottom support (23). One end of the first side support (22) is connected to the first support (21), and the other end is connected to the cave.

4. The tunnel excavation support structure for water diversion works according to claim 3, characterized by: The second support assembly (2) also includes a second guard (24) and a second side guard (25). One end of the second guard (24) is connected to the first guard (21), one end of the second side guard (25) is connected to the second guard (24), and the other end is connected to the cavity. One side of the second side guard (25) is connected to the first side guard (22).

5. The tunnel excavation support structure for a water diversion project according to claim 4, characterized by: The first protective section (21) and the first side protective section (22) are provided in at least two sets, and the second protective section (24) and the second side protective section (25) are provided in at least two sets.

6. The tunneling support structure for water diversion works according to claim 1, characterized in that: The water intake assembly (3) includes a through part (31) and a guide part (32), and the guide part (32) is respectively inserted into the first support assembly (1) and the second support assembly (2); The through section (31) is connected to the cavity by the guide section (32) and the first support component (1) in sequence, and / or the guide section (32) and the second support component (2) are connected to the cavity in sequence.

7. The tunnel excavation support structure for water diversion works according to claim 4, characterized by: A first water-stopping part (4) is provided at the connection between the first protective part (21) and the second protective part (24), and the first water-stopping part (4) is fixed in the gap between the first protective part (21) and the second protective part (24).

8. The tunnel excavation support structure for water diversion works according to claim 4, characterized by: A second water-stopping part is provided at the connection between the first side guard (22) and the second side guard (25), and the second water-stopping part is fixed in the gap between the first side guard (22) and the second side guard (25).

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