Interface structure of parent-child shield tunnel

Abstract

To provide an interface structure for a parent-child shield tunnel that solves the problems of land acquisition, house relocation, traffic control, and pipeline relocation that arise from construction using the open cut method. [Solution] The interface structure of the parent-child shield inner tunnel includes a large-diameter shield tunnel 1, an interface annular beam 3 is provided on the surface of the large-diameter shield tunnel, a small-diameter shield tunnel is provided to the right of the large-diameter shield tunnel, the large-diameter shield tunnel and the small-diameter shield tunnel are connected via the interface annular beam, a parent shield machine 5 is provided on the outer wall of the large-diameter shield tunnel, a child shield machine 4 is provided inside the parent shield machine, a protective component is provided on the surface of the parent shield machine, the protective component includes an outer shell, and the outer shell and the parent shield machine are fixedly connected.

Description

[Technical Field]

[0001] The present invention relates to the technical field of municipal engineering, and in particular to the interface structure of a parent-child shield tunnel. [Background technology]

[0002] Shield tunneling is widely used in the construction of urban subway tunnels, underground road tunnels, and various other underground works. With the development of urban construction, the need for the development and utilization of underground space is constantly increasing, and more efficient and flexible tunnel construction technology is required.

[0003] In conventional shield construction, when parent and child shields are separated, it is usually necessary to install a shield shaft professionally. The construction of the shield shaft requires the use of the open cut method, which creates problems such as land acquisition, relocation of houses, traffic control, and pipeline relocation. Summary of the Invention [Problem to be solved by the invention]

[0004] To compensate for the above drawbacks, this invention provides an interface structure for a parent-child shield tunnel, and aims to alleviate the problems of land acquisition, house relocation, traffic control, and pipeline relocation that arise from construction using the open cut method. [Means for solving the problem]

[0005] In order to achieve the above-mentioned objectives, the present invention provides the following technical solution: a parent-child shield tunnel interface structure, which includes a large-diameter shield tunnel, an interface annular beam installed on the inner surface of the large-diameter shield tunnel, a small-diameter shield tunnel installed on the right side of the large-diameter shield tunnel, the large-diameter shield tunnel and the small-diameter shield tunnel connected via an interface annular beam, a parent shield machine installed on the outer wall of the large-diameter shield tunnel, a child shield machine installed inside the parent shield machine, and a protective component installed on the surface of the parent shield machine.

[0006] Preferably, the protective component includes an outer shell, the outer shell being fixedly connected to the parent shield machine, the outer shell remaining in the soil and functioning as a support structure when the child shield machine is evacuated.

[0007] Preferably, the interface annular beam serves as an escape reaction frame for the secondary shield machine when the secondary shield machine escapes from the primary shield machine, and an embedded steel plate is installed between the large-diameter shield tunnel and the interface annular beam.

[0008] Preferably, the cross sections of the large-diameter shield tunnels are all circular, and the cross sections of the small-diameter shield tunnels are all circular.

[0009] Preferably, the large-diameter shield tunnel is assembled by segments, and the small-diameter shield tunnel is assembled by segments.

[0010] Preferably, a ground reinforcement section is installed on the surface of the sub-shield machine, and the ground reinforcement section is located at an escape position between the sub-shield machine and the main shield machine.

[0011] Preferably, an injection hole is provided in the side wall of the small-diameter shield tunnel, and an injection pipe is installed inside the injection hole.

[0012] Preferably, a cavity is provided between the small-diameter shield tunnel and the outer shell, and a filling layer is provided inside the cavity. [Effects of the Invention]

[0013] The present invention has the following beneficial effects: 1. In this invention, when the parent and child shields are separated, there is no need to install a separate shield shaft. The cooperation between the interface ring beam and the outer shell allows the child shield machine to complete the escape operation directly within the existing structural system, solving the problems of land acquisition, house relocation, traffic control, and pipeline relocation that arise from construction using the open cut method.

[0014] 2. In this invention, when the sub-shield machine escapes from the main shield machine, the outer shell of the main shield machine remains in the soil to form a support structure, and the sub-shield machine is always within the protective range of the outer shell during the escape process, which solves the construction risk of tunnel entrance leakage when the large-diameter shield arrives and the small-diameter shield restarts. [Brief explanation of the drawings]

[0015] [Figure 1] Schematic diagram of the proposed interface structure ground reinforcement for a parent-child shield tunnel; [Figure 2] 1 is a schematic diagram of the child shield machine escape from the interface structure of a parent-child shield tunnel proposed in this invention; [Figure 3] 1 is a schematic diagram of the interface ring beam of the interface structure of a parent-child shield tunnel proposed in this invention; [Figure 4] Schematic diagram of the child shield machine release process of the interface structure of a parent-child shield tunnel proposed in this invention; [Figure 5] Schematic diagram of normal excavation after the child shield machine has exited the interface structure of a parent-child shield tunnel proposed in this invention; [Figure 6]The cross-sectional view of the interface structure of the parent-child shield tunnel proposed in this invention after the parent-child shield tunnel is penetrated; [Figure 7] 1 is a schematic diagram of the injection pipe of the interface structure of a parent-child shield tunnel proposed in this invention; [Figure 8] This is a schematic diagram of the injection hole of the interface structure of a parent-child shield tunnel proposed in this invention. Reference symbols: 1, large-diameter shield tunnel; 2, small-diameter shield tunnel; 3, interface ring beam; 4, child shield machine; 5, parent shield machine; 6, outer shell; 7, ground reinforcement section; 8, embedded steel plate; 9, injection hole; 10, filling layer; 11, injection pipe. DETAILED DESCRIPTION OF THE INVENTION

[0016] The drawings of the specification of this invention are as follows: See Although the technical solutions in the embodiments of the present invention are clearly and completely described, it is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without any creative work are all included in the scope of protection of the present invention.

[0017] 1 to 2, one embodiment of the present invention provides: a type of parent-child shield tunnel interface structure, which includes a large-diameter shield tunnel 1, an interface annular beam 3 installed on the inner surface of the large-diameter shield tunnel 1, a small-diameter shield tunnel 2 installed on the right side of the large-diameter shield tunnel 1, the large-diameter shield tunnel 1 and the small-diameter shield tunnel 2 connected via the interface annular beam 3, a parent shield machine 5 installed on the outer wall of the large-diameter shield tunnel 1, a child shield machine 4 installed inside the parent shield machine 5, and protective components installed on the surface of the parent shield machine 5.

[0018] Specifically, the diameter of the large-diameter shield tunnel 1 is larger than that of the small-diameter shield tunnel 2, in order to accommodate the main shield machine 5 and provide working space. The small-diameter shield tunnel 2 and the large-diameter shield tunnel 1 are connected via an interface ring beam 3, which plays a connecting and transitional role and ensures the structural stability and integrity between the two tunnels;

[0019] The main shield machine 5 is placed on the outer wall of the large-diameter shield tunnel 1, and its dimensions are suitable for the small-diameter shield tunnel 2, allowing it to operate stably outside the tunnel. A sub-shield machine 4 is installed inside the main shield machine 5, and its dimensions are smaller than those of the main shield machine 5, allowing early preparation work to be carried out inside the main shield machine 5. After reaching the designated position, it exits the main shield machine 5 to carry out subsequent excavation work, solving the problems of land excavation, house relocation, traffic control, and pipeline relocation that arise from construction using the open-cut method.

[0020] Referring to Figures 2 to 4, the protective component includes an outer shell 6, which is fixedly connected to the main shield machine 5, and the outer shell 6 remains in the soil and functions as a support structure when the sub-shield machine 4 escapes.

[0021] Specifically, the outer shell 6 is fixed to the surface of the main shield machine 5, and the outer shell 6 is used to receive pressure from the surrounding soil. The shape of the outer shell 6 is in close contact with the main shield machine 5, and during the excavation process of the main shield machine 5, the outer shell 6 advances together with the main shield machine 5;

[0022] When the sub-shield machine 4 escapes from the main shield machine 5, the outer shell 6 remains in the soil to form a tunnel wall structure, providing support for the escape of the sub-shield machine 4, thereby preventing the collapse of the surrounding soil during the escape process of the sub-shield machine 4 and maintaining the stability of the tunnel entrance area, thereby reducing the construction risk of tunnel entrance leakage when the large-diameter shield arrives and the small-diameter shield restarts.

[0023] Referring to Figures 2 and 3, the interface annular beam 3 serves as an escape reaction frame for the sub-shield machine 4 when the sub-shield machine 4 escapes from the main shield machine 5, and an embedded steel plate 8 is installed between the large-diameter shield tunnel 1 and the interface annular beam 3.

[0024] Specifically, the interface annular beam 3 is a ring structure, and its design strength and dimensions must be determined based on the reaction force required when the sub-shield machine 4 escapes and the force-bearing requirements of the tunnel structure. The interface annular beam 3 is used as an escape reaction frame during the escape process of the sub-shield machine 4. The interface annular beam 3 can withstand the thrust generated by the propulsion system of the sub-shield machine 4, provide reaction support for the sub-shield machine 4, and ensure that the sub-shield machine 4 can smoothly escape from the main shield machine 5;

[0025] The embedded steel plate 8 is installed between the large-diameter shield tunnel 1 and the interface annular beam 3, and its function is to strengthen the connection strength between the interface annular beam 3 and the large-diameter shield tunnel 1, and the embedded steel plate 8 is pre-embedded during the segment assembly process of the large-diameter shield tunnel 1;

[0026] The surface of the steel plate is flat and has a certain roughness, which is advantageous for better bonding with the concrete of the interface annular beam 3. When the interface annular beam 3 is constructed, the embedded steel plate 8 and the reinforcing bars of the interface annular beam 3 are connected by welding, so that the interface annular beam 3 is attached to the large-diameter shield tunnel 1 and can jointly bear various loads.

[0027] 6 and 7, the cross sections of the large-diameter shield tunnels 1 are all circular, and the cross sections of the small-diameter shield tunnels 2 are all circular.

[0028] Specifically, the large-diameter shield tunnel 1 adopts a circular cross-section design, which allows the pressure from the surrounding soil to be evenly distributed, increasing the stability of the tunnel structure. The small-diameter shield tunnel 2 also adopts a circular cross-section, which blends in with the large-diameter shield tunnel 1 to provide excavation space for the sub-shield machine 4.

[0029] Referring to FIG. 5, the large-diameter shield tunnel 1 is assembled by segments, and the small-diameter shield tunnel 2 is assembled by segments.

[0030] Specifically, both the large-diameter shield tunnel 1 and the small-diameter shield tunnel 2 are formed by assembling segments, which are precast reinforced concrete structures that are precast in factories and then transported to the construction site.The segments are connected with bolts to form an integrated circular structure, which constitutes the support system for the large-diameter shield tunnel 1 and the small-diameter shield tunnel 2.

[0031] 1 and 2, a ground reinforcing section 7 is installed on the surface of sub shield machine 4, and ground reinforcing section 7 is located at an escape position between sub shield machine 4 and main shield machine 5.

[0032] Specifically, the ground reinforcement section 7 is a reinforcement measure applied to the soil at the escape position of the sub-shield machine 4. Before the main shield machine 5 excavates to the escape position of the sub-shield machine 4, an appropriate reinforcement method is selected based on the geological conditions of the area, and the reinforcement parameters are calculated and controlled based on the geological investigation report and construction design requirements to ensure that the soil in the area provides sufficient bearing capacity during the escape process of the sub-shield machine 4 and reduce the risk of soil deformation and collapse.

[0033] 7 and 8, an injection hole 9 is provided in the side wall of small-diameter shield tunnel 2, and an injection pipe 11 is installed inside injection hole 9.

[0034] Specifically, the injection holes 9 are uniformly distributed on the side walls of the small-diameter shield tunnel 2, and the injection holes 9 are pre-fixed during the precasting process of the segments of the small-diameter shield tunnel 2, so that the hole walls are smooth and have a certain verticality, allowing the injection pipe 11 to be inserted smoothly;

[0035] The outer diameter of the injection pipe 11 is compatible with the injection hole 9, one end of the injection pipe 11 is inserted into the injection hole 9, and the other end is connected to the injection equipment. After the sub-shield machine 4 has completely exited from the main shield machine 5, filling material is injected into the cavity between the small-diameter shield tunnel 2 and the outer shell 6 through the injection pipe 11, and filling material is formed to form a filling layer 10, filling the cavity and enhancing the integrity and stability of the tunnel structure.

[0036] Referring to FIG. 6, a cavity is provided between the small-diameter shield tunnel 2 and the outer shell 6, and a packed bed 10 is provided inside the cavity.

[0037] Specifically, after the sub-shield machine 4 exits from the main shield machine 5, a ring-shaped cavity is formed between the small-diameter shield tunnel 2 and the outer shell 6. If this cavity is not treated, it will affect the stability and waterproof performance of the tunnel structure, so a filling layer 10 needs to be installed in the cavity;

[0038] The filling material is injected into the cavity through the injection pipe 11, and the material is uniformly distributed in the cavity and solidifies to form a filling layer 10. The filling layer 10 not only fills the cavity, but also plays a supporting and waterproofing role, thereby improving the stability and sealing of the entire tunnel structure.

[0039] Working principle: During the process of the main shield machine 5 excavating towards the exit position of the sub shield machine 4, before the main shield machine 5 excavates to the exit position of the sub shield machine 4, the layer reinforcement work is started, and the ground reinforcement part 7 is constructed in the soil at the exit position of the sub shield machine 4;

[0040] After the parent shield machine 5 has excavated to the exit position of the child shield machine 4, first clean the surface of the embedded steel plate 8 on the large-diameter shield tunnel 1 to remove any oil stains, rust and other foreign matter that may be present on the surface, and ensure that the surface of the steel plate is clean and flat;

[0041] Next, the formwork of the interface annular beam 3 is assembled on the embedded steel plate 8, and finally, concrete is uniformly poured into the formwork to form the interface annular beam 3, and then the negative annular segment of the small-diameter shield tunnel 2 is installed between the interface annular beam 3 and the sub-shield machine 4;

[0042] After the installation of the negative ring segment is completed, the sub-shield machine 4 starts to escape from the main shield machine 5 by using the interface ring beam 3 as a reaction frame, and activates the propulsion system of the sub-shield machine 4, gradually increasing the thrust so that the sub-shield machine 4 escapes from the main shield machine 5 along the predetermined direction, and the outer shell 6 of the main shield machine 5 remains in the soil, thus solving the construction risk of tunnel entrance leakage when the large-diameter shield arrives and the small-diameter shield restarts;

[0043] After the sub-shield machine 4 has completely exited the main shield machine 5, an injection pipe 11 is immediately and accurately driven into the injection hole 9 previously installed in the small-diameter shield tunnel 2, and the cavity between the small-diameter shield tunnel 2 and the outer shell 6 is filled by injection through the injection pipe 11 to form a filling layer 10, and finally the excavation of the remaining small-diameter shield tunnel 2 is completed, thereby solving the problems of land expropriation, house relocation, traffic control, and pipeline relocation that arise from construction using the open cut method.

[0044] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art may make modifications to the technical solutions described in the above embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. The system includes a large-diameter shield tunnel (1), an interface annular beam (3) provided on the inner surface of the large-diameter shield tunnel (1), a small-diameter shield tunnel (2) provided on the right side of the large-diameter shield tunnel (1), the large-diameter shield tunnel (1) and the small-diameter shield tunnel (2) being connected via the interface annular beam (3), a parent shield machine (5) provided on the outer wall of the large-diameter shield tunnel (1), a sub shield machine (4) provided inside the parent shield machine (5), and a protective component provided on the surface of the parent shield machine (5). The interface structure of the parent-child shield tunnel is characterized by the following.

2. The protective component includes an outer shell (6), the outer shell (6) and the main shield machine (5) are fixedly connected, and the outer shell (6) remains underground to serve as a support structure for the sub-shield machine (4) when it is released. The interface structure of the parent-child shield tunnel according to claim 1 .

3. The interface annular beam (3) serves as an escape reaction frame for the sub-shield machine (4) when the sub-shield machine (4) escapes from the main shield machine (5), and an embedded steel plate (8) is provided between the large-diameter shield tunnel (1) and the interface annular beam (3). The interface structure of the parent-child shield tunnel according to claim 1 .

4. The cross sections of the large-diameter shield tunnels (1) are all circular, and the cross sections of the small-diameter shield tunnels (2) are all circular. The interface structure of the parent-child shield tunnel according to claim 1 .

5. The large-diameter shield tunnel (1) is assembled using segments, and the small-diameter shield tunnel (2) is assembled using segments. The interface structure of the parent-child shield tunnel according to claim 1 .

6. A ground improvement section (7) is provided on the surface of the sub-shield machine (4), and the ground improvement section (7) is located at an escape position between the sub-shield machine (4) and the main shield machine (5). The interface structure of the parent-child shield tunnel according to claim 1 .

7. An injection hole (9) is provided in the side wall of the small-diameter shield tunnel (2), and an injection pipe (11) is provided inside the injection hole (9). The interface structure of the parent-child shield tunnel according to claim 1 .

8. A cavity is provided between the small-diameter shield tunnel (2) and the outer shell (6), and a filling layer (10) is provided inside the cavity. The interface structure of the parent-child shield tunnel according to claim 1 .

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