Double-arch multi-hole tunnel with multi-compartment integrated pipeline corridor function and its construction method

Abstract

A double-arch multi-hole tunnel and construction method equipped with a multi-compartment integrated pipe gallery function, the tunnel comprises: a right-hole composite lining, including an internal secondary lining and an external initial support of unclosed ring-shaped steel, the arch foot of the right hole is supported on the right vertical outer wall of the multi-compartment integrated pipe gallery, and the secondary lining forms a right-hole lining ring with the vertical outer wall by implanting anchor bars; a middle multi-compartment integrated pipe gallery, located at the middle guide tunnel position, is a continuous-arch reinforced concrete structure, and the interior of the pipe gallery is divided into three independent compartments by partition walls; a left-hole composite lining, including an internal secondary lining and an external initial support of unclosed ring-shaped steel, the arch foot of the left hole is supported on the left vertical outer wall of the multi-compartment integrated pipe gallery, and the secondary lining forms a left-hole lining ring with the vertical outer wall by implanting anchor bars. The tunnel structure of the present invention has the multi-functions of both traffic passage and basic pipeline laying, can make full use of scarce urban resources within a limited space, and improve the overall safety and construction efficiency of the tunnel.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel engineering, and in particular to a double-arch multi-hole tunnel equipped with a multi-compartment integrated pipeline corridor function and a construction method. Background Art

[0002] Traditional tunnels often use a dual-hole structure with a left-right separation, facilitating construction and maintenance while ensuring traffic efficiency. However, with the acceleration of urbanization, urban node resources are limited, especially at narrow urban intersections. Conventional designs struggle to meet the demands of high-density infrastructure layouts. To address this, a common approach is to install integrated pipeline corridors within tunnels to accommodate pipelines for water supply, drainage, electricity, and communications. However, these traditional solutions often only achieve a single function, are costly, and present significant construction challenges. There is a lack of innovative solutions that combine multifunctionality, cost-effectiveness, and safety.

[0003] To address these issues, especially under complex geological and limited space conditions, a tunnel structure design and construction method that can achieve multifunctional integration within the limited available space is urgently needed to overcome the limitations of traditional tunnel structures. Summary of the Invention

[0004] The present invention provides a double-arch multi-hole tunnel and construction method equipped with a multi-compartment integrated pipeline corridor function. The tunnel structure has the multi-functions of both traffic passage and basic pipeline laying, can make full use of scarce urban resources within a limited space, and improve the overall safety and construction efficiency of the tunnel.

[0005] A double-arch multi-hole tunnel equipped with a multi-compartment integrated pipe gallery, comprising a composite lining for the right hole, a multi-compartment integrated pipe gallery in the middle, and a composite lining for the left hole;

[0006] The composite lining of the right tunnel includes an internal secondary lining and an external initial support of unenclosed ring-shaped steel. The arch foot of the right tunnel is supported on the right vertical outer wall of the multi-compartment integrated pipeline corridor, and the secondary lining forms a right tunnel lining ring with the vertical outer wall by implanting anchor bars.

[0007] The intermediate multi-compartment integrated pipe gallery is located at the middle pilot tunnel and is a continuous arch reinforced concrete structure. The interior of the pipe gallery is divided into three independent compartments by partition walls. The compartments carry the city's water supply, drainage, electricity, and communication infrastructure. The partition walls also serve as support structures for the linings of the left and right tunnels.

[0008] The composite lining of the left tunnel includes an internal secondary lining and an external initial support of unenclosed ring-shaped steel. The arch foot of the left tunnel is supported on the vertical outer wall on the left side of the multi-compartment integrated pipeline corridor, and the secondary lining forms a left tunnel lining ring with the vertical outer wall by implanting embedded steel bars.

[0009] Furthermore, the intermediate multi-compartment integrated pipeline corridor includes a reinforced concrete foundation, upright exterior walls, internal partition walls and an arch structure, and the reinforced concrete foundation, upright exterior walls and arch structure form a closed pipeline corridor structural ring through pre-embedded rebar to realize a closed load-bearing structure.

[0010] Furthermore, the right hole lining ring, the left hole lining ring and the pipe gallery structure ring form three independent closed-loop force-bearing systems through the implanted rebar.

[0011] Furthermore, the cabin height is ≤4 meters.

[0012] Furthermore, a grouting duct is pre-buried on the top of the cabin integrated pipeline corridor for surrounding rock reinforcement during the construction period.

[0013] A construction method for a double-arch multi-hole tunnel equipped with a multi-compartment integrated pipe gallery as described above comprises the following steps:

[0014] Multi-compartment pipe gallery construction:

[0015] a) Middle tunnel construction: Excavate the middle tunnel using the step method, provide initial support for the arch, and pre-embed the top grouting conduit; excavate the lower soil, and provide initial support for the side walls; pour the reinforced concrete foundation of the middle tunnel, erect formwork for the left and right partition walls and arch structure, and pre-embed rebar in the partition walls to connect to the secondary linings of the left and right tunnels of the integrated pipeline corridor;

[0016] b) Right tunnel corridor construction: Excavate the right tunnel soil, install initial arch support and top grouting pipe; excavate the lower soil and install initial side wall support; pour the right tunnel reinforced concrete foundation and construct the right side wall and arch structure, and pre-embed the right tunnel embedded rebar that connects to the secondary lining of the right multi-arch tunnel main tunnel;

[0017] c) Construction of the left tunnel corridor: Excavate the left tunnel soil, install initial arch support and top grouting pipe; excavate the lower soil and install initial side wall support; pour the left tunnel reinforced concrete foundation and construct the left side wall and arch structure, and pre-embed the left tunnel embedded steel bars connected to the secondary lining of the left multi-arch tunnel main tunnel;

[0018] The reinforced concrete foundation of the middle hole, the reinforced concrete foundation of the left hole, the reinforced concrete foundation of the right hole, the left wall, the right wall and the arch structure form a closed pipe gallery structure ring through pre-buried reinforcement;

[0019] Excavation of main tunnel and pilot tunnel:

[0020] d) Right tunnel pilot tunnel: Excavate the right tunnel pilot tunnel soil in upper and lower steps, and apply shotcrete support;

[0021] e) Left tunnel pilot tunnel: Excavate the left tunnel pilot tunnel soil in upper and lower steps, apply shotcrete support and pre-embed H-shaped steel supports;

[0022] Main tunnel construction and secondary lining closure:

[0023] f) Right main tunnel construction: excavate the core soil and lower steps of the right main tunnel in stages, and implement initial support without enclosed ring steel. The initial support is mechanically connected to the side walls of the tunnel corridor through embedded parts;

[0024] g) Construction of the left main tunnel: excavate the core soil and lower steps of the left main tunnel in stages, implement initial support of unenclosed ring steel, and install temporary H-shaped steel supports to resist the eccentric pressure of the right tunnel;

[0025] h) Closure of secondary lining: remove the initial support that conflicts with the secondary lining space, cast the secondary lining invert arch and arch portion of the right tunnel, the secondary lining invert arch and arch portion of the left tunnel, and connect them with the corridor structure ring through the pre-buried reinforcement to form a coordinated force system of the right tunnel lining ring, the left tunnel lining ring and the corridor structure ring.

[0026] The present invention utilizes a shared central partition wall structure to form two independent but rigidly reinforced tunnels. Each tunnel is a bidirectional continuous arch structure, integrated to form a complex multi-compartment space, meeting the multifunctional integration of urban transportation and infrastructure. A permanent central guide tunnel is realized at a key location with the help of the central guide tunnel structure, which can be used for future pipeline expansion and emergency evacuation channels. The structure is formed with the help of the central guide tunnel, reducing additional excavation and construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a cross-sectional view of a double-arch multi-hole tunnel equipped with a multi-compartment integrated pipeline corridor according to the present invention, including permanent and temporary structures;

[0028] Figure 2 This is a cross-sectional view of the closed stress-bearing structure of the middle multi-compartment integrated pipe gallery of the present invention;

[0029] Figure 3 It is a cross-sectional view of the closed stress-bearing structure of the left and right main hole structures of the present invention. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0031] See also Figure 1-3 The embodiment of the present invention provides a double-arch multi-hole tunnel equipped with a multi-compartment integrated pipe gallery function, comprising:

[0032] The composite lining of the right tunnel includes an internal secondary lining and an external initial support of unenclosed ring steel. The arch foot of the right tunnel is supported on the right vertical outer wall of the multi-compartment integrated pipe gallery, and the secondary lining forms a right tunnel lining ring with the vertical outer wall by implanting rebar.

[0033] The central multi-compartment integrated pipe gallery, located in the central pilot tunnel, is a continuous-arch reinforced concrete structure consisting of three independent compartments, internally divided by partition walls into an electrical compartment, an integrated compartment, and a drainage compartment. The partition walls also serve as support structures for the linings of the left and right tunnels. The compartments are ≤4 meters high, with the electrical compartment being 3 meters wide, the integrated compartment being 4 meters wide, and the drainage compartment being 3 meters wide. Grouting conduits are pre-buried on the top of the integrated pipe gallery to reinforce the surrounding rock during construction.

[0034] The composite lining of the left tunnel includes the internal secondary lining and the initial support of the external unenclosed ring steel. The arch foot of the left tunnel is supported on the vertical outer wall on the left side of the multi-compartment integrated pipeline corridor, and the secondary lining forms a left tunnel lining ring with the vertical outer wall by implanting anchor bars.

[0035] Among them, the intermediate multi-compartment integrated pipeline corridor includes a reinforced concrete foundation, upright exterior walls, internal partition walls and an arch structure. The reinforced concrete foundation, upright exterior walls and arch structure form a closed pipeline corridor structure ring through pre-embedded rebar.

[0036] The right hole lining ring, the left hole lining ring and the pipe gallery structure ring form three independent closed-loop force-bearing systems through the implanted rebar.

[0037] An embodiment of the present invention further provides a construction method for a double-arch multi-hole tunnel equipped with a multi-compartment integrated pipe gallery function, taking the excavation of the right hole of the main hole as an example, comprising the following steps:

[0038] 1. Construction of multi-compartment pipe gallery structure:

[0039] ① The central tunnel of the utility corridor was constructed using the step method. After excavating the central tunnel soil (I1), initial arch support (I2) and top grouting ducts were installed. Radial grouting ducts were also installed to ensure safety. Next, the lower soil (I3) was excavated, followed by initial side wall support (I4). The central tunnel reinforced concrete foundation (I5) was constructed, followed by the left and right partition walls (I6) and the arch reinforced concrete structure (I7). Rebar (I8) was left to connect to the secondary linings of the left and right tunnels of the utility corridor.

[0040] ② The right tunnel of the integrated utility corridor was constructed using the step method. After excavating the right tunnel soil mass II1, initial arch support II2 and the top grouting conduit were installed. Radial grouting conduits were also installed to ensure safety. Next, the lower soil mass II3 was excavated, followed by initial side wall support II4. The right tunnel reinforced concrete foundation II5 was constructed, followed by the right side wall II6 and the arch reinforced concrete structure II7. Rebar II8 was left in place for connection to the secondary lining of the right multi-arch tunnel main tunnel.

[0041] ③ The left tunnel of the integrated pipeline corridor was constructed using the step method. After excavating the left tunnel soil (III1), initial arch support (III2) and top grouting ducts were installed. Radial grouting ducts were also installed to ensure safety. Next, the lower soil (III3) was excavated, followed by initial side wall support (III4). The left tunnel reinforced concrete foundation (III5) was constructed, followed by the left side wall (III6) and the arch reinforced concrete structure (III7). Rebar (III8) was left to connect to the secondary lining of the left multi-arch tunnel main tunnel.

[0042] The integrated pipeline corridor can be divided into upper and lower parts as needed.

[0043] 2. Construction of left and right pilot tunnels of the main tunnel of the multi-arch tunnel:

[0044] ① Excavate the upper step IV1 of the pilot tunnel of the right tunnel, apply shotcrete and embed steel section IV2, then excavate the lower step IV3 of the pilot tunnel of the right tunnel and apply shotcrete anchor support IV4.

[0045] ② Excavate the upper step V1 of the pilot tunnel of the left tunnel, apply shotcrete and embed steel section V2, then excavate the lower step V3 of the pilot tunnel of the right tunnel and apply shotcrete support V4.

[0046] 3. Construction of the left and right main tunnels of the multi-arch tunnel:

[0047] ① Excavate the soil VI1 above the core soil of the right main tunnel, spray concrete and embed steel section VI2. The initial support is directly supported on the side wall of the tunnel corridor and reliably connected through embedded parts.

[0048] The core soil VI3 and the lower step VI4 were excavated in sequence, and then the initial support of the right tunnel invert arch was constructed and the steel section VI5 was embedded.

[0049] ② Excavate soil VII1 above the core soil of the left main tunnel, spray concrete and embed steel section VII2. The initial support is directly supported on the side wall of the tunnel corridor and reliably connected through embedded parts.

[0050] Excavate core soil VII3 and install temporary steel section VII4 to connect the primary support of the left pilot tunnel and the primary support of the left pilot tunnel of the pipeline corridor. This will resist the bias pressure generated by the excavation of the right tunnel. Excavate the lower step VII5, then install the primary support of the left tunnel invert arch and pre-embed steel section VII6.

[0051] ③ Construction of the secondary lining of the right main tunnel: Promptly construct the right tunnel secondary lining arch VIII and securely connect it to the pipe gallery side wall with embedded rebar. Then, construct the right tunnel secondary lining arch IX and securely connect it to the side wall and the multi-compartment pipe gallery structure side wall with embedded rebar II8. Remove the primary support II4 in areas of three-dimensional conflict.

[0052] Secondary lining construction for the left main tunnel: Promptly construct the left tunnel secondary lining inverted arch X, securely connecting it to the pipe gallery side walls with embedded rebar. Then, construct the left tunnel secondary lining arch XI and securely connect it to the side walls and the multi-compartment pipe gallery structure side walls with embedded rebar III8. Remove the multi-compartment pipe gallery structure primary support III4 in areas of three-dimensional conflict.

[0053] Compared with the prior art, the present invention has the following beneficial effects:

[0054] 1. Functional Diversity: This invention achieves tunnel diversification by installing a comprehensive pipeline corridor within the multi-arch tunnel. The tunnel not only meets traffic needs but also carries urban infrastructure such as water supply, drainage, electricity, and communications, fully utilizing scarce resources at urban road nodes.

[0055] 2. Economical: By designing the multi-compartment tunnel as a permanent structure, this invention avoids additional excavation and construction costs. The installation of the integrated tunnel only adds limited cost to tunnel construction, resulting in high economic efficiency.

[0056] 3. Construction safety: The multi-compartment tunnel in the present invention adopts a large-span reinforced concrete structure, which has significantly higher rigidity and stability than traditional partition walls. The tunnel structure forms a reinforced concrete structure with multiple closed load-bearing rings, which can effectively improve the structural safety during tunnel construction and reduce construction risks.

[0057] 4. Connectivity of urban infrastructure: Through the design of an integrated pipeline corridor, this invention achieves efficient connectivity of urban infrastructure on both sides of the tunnel, avoiding the additional costs of new road access points and integrated pipelines. It is particularly suitable for areas with limited resources at urban intersections.

[0058] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A double-arch multi-hole tunnel equipped with a multi-compartment integrated pipeline corridor, characterized in that: Including the composite lining of the right tunnel, the middle multi-compartment integrated pipeline gallery and the composite lining of the left tunnel, The composite lining of the right tunnel includes an internal secondary lining and an external initial support of unenclosed ring-shaped steel. The arch foot of the right tunnel is supported on the right vertical outer wall of the multi-compartment integrated pipeline corridor, and the secondary lining forms a right tunnel lining ring with the vertical outer wall by implanting anchor bars. The intermediate multi-compartment integrated pipe gallery is located at the middle pilot tunnel and is a continuous arch reinforced concrete structure. The interior of the pipe gallery is divided into three independent compartments by partition walls. The compartments carry the city's water supply, drainage, electricity, and communication infrastructure. The partition walls also serve as support structures for the linings of the left and right tunnels. The composite lining of the left tunnel includes an internal secondary lining and an external initial support of unenclosed ring-shaped steel. The arch foot of the left tunnel is supported on the left vertical outer wall of the multi-compartment integrated pipeline gallery, and the secondary lining forms a left tunnel lining ring with the vertical outer wall by implanting anchor bars. The intermediate multi-compartment integrated pipe gallery includes a reinforced concrete foundation, upright exterior walls, internal partition walls and an arch structure, and the reinforced concrete foundation, upright exterior walls and arch structure form a closed pipe gallery structure ring through pre-embedded reinforcement to achieve a closed load-bearing structure; The right hole lining ring, the left hole lining ring and the pipe gallery structure ring form three independent closed-loop force-bearing systems through the implanted rebar.

2. The double-arch multi-hole tunnel with multi-compartment integrated pipeline corridor function as claimed in claim 1, characterized in that: The cabin height is ≤ 4 meters.

3. The double-arch multi-hole tunnel with multi-compartment integrated pipeline corridor function as claimed in claim 1, characterized in that: The pre-buried grouting duct on the top of the multi-compartment integrated pipeline corridor is used to reinforce the surrounding rock during the construction period.

4. A construction method for a double-arch multi-hole tunnel equipped with a multi-compartment integrated pipeline corridor according to any one of claims 1 to 3, characterized in that: The steps include: Construction of multi-compartment integrated pipe gallery: a) Middle tunnel construction: Excavate the middle tunnel soil using the step method (I1), construct the initial arch support (I2) and pre-embed the top grouting pipe; excavate the lower soil (I3) and then construct the initial side wall support (I4); pour the reinforced concrete foundation of the middle tunnel (I5), erect formwork to construct the left and right partition walls (I6) and the arch structure (I7), and at the same time pre-embed the embedded steel bars in the partition walls to connect to the secondary linings of the left and right tunnels of the integrated pipeline corridor (I8); b) Construction of the right tunnel corridor: Excavate the right tunnel soil (Ⅱ1), construct the initial support of the arch (Ⅱ2) and the top grouting pipe; excavate the lower soil (Ⅱ3) and then construct the initial support of the side wall (Ⅱ4); pour the reinforced concrete foundation of the right tunnel (Ⅱ5) and construct the right side wall (Ⅱ6) and the arch structure (Ⅱ7); and pre-embed the right tunnel anchor bar (Ⅱ8) connected to the secondary lining of the right multi-arch tunnel main tunnel; c) Construction of the left tunnel corridor: excavate the left tunnel soil (III1), construct the initial support of the arch (III2) and the top grouting pipe; excavate the lower soil (III3) and then construct the initial support of the side wall (III4); pour the reinforced concrete foundation of the left tunnel (III5) and construct the left side wall (III6) and the arch structure (III7); and pre-embed the left tunnel anchor bar (III8) connected to the secondary lining of the left arch tunnel main tunnel; The reinforced concrete foundation of the middle hole (I5), the reinforced concrete foundation of the left hole (III5), the reinforced concrete foundation of the right hole (II5), the left wall (III6), the right wall (II6) and the arch structure (I7, II7, III7) form a closed pipe gallery structure ring through pre-buried rebar (I8); Excavation of main tunnel and pilot tunnel: d) Right tunnel pilot tunnel: Excavate the right tunnel pilot tunnel soil in upper and lower steps (IV1, IV3), and implement shotcrete support (IV2, IV4); e) Left tunnel pilot tunnel: Excavate the left tunnel pilot tunnel soil in upper and lower steps (V1, V3), apply shotcrete support (V2, V4) and embed H-shaped steel supports; Main tunnel construction and secondary lining closure: f) Construction of the right main tunnel: excavate the core soil (VI1, VI3) and lower steps (VI4) of the right main tunnel in stages, and construct initial support (VI2, VI5) without enclosing annular steel. The initial support is mechanically connected to the side walls of the tunnel corridor through embedded parts. g) Construction of the left main tunnel: excavate the core soil of the left main tunnel (VII1, VII3) and the lower step (VII5) in stages, implement initial support of unclosed ring steel (VII2, VII6), and install temporary H-shaped steel support (VII4) to resist the bias pressure of the right tunnel; h) Closure of secondary lining: remove the initial support that conflicts with the secondary lining space, cast the right tunnel secondary lining inverted arch (VIII) and the right tunnel secondary lining arch portion (IX), the left tunnel secondary lining inverted arch (X) and the left tunnel secondary lining arch portion (XI), and connect them with the corridor structure ring through the pre-buried rebar (II8, III8) to form a coordinated force system of the right tunnel lining ring, the left tunnel lining ring and the corridor structure ring.

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