Large-section rectangular pipe-jacking tunnel leaning device

Abstract

The utility model relates to the field of tunnel engineering, in particular to a large-section rectangular pipe jacking tunnel leaning device. The backing device is composed of a rigid backing structure in a working well, a tunnel structure and a continuous wall body, wherein the rigid backing structure, the tunnel structure and the continuous wall body are arranged behind a rectangular jacking pipe in advance, and large jacking force can be provided for a large-section rectangular jacking pipe tunnel. The rigid backrest structure in the working well can adopt a reinforced concrete structure form with higher rigidity; the tunnel structure can adopt an open cut section structure and an enclosure wall body form thereof; the continuous wall body is arranged on the lower portion of a bottom plate of the tunnel structure and can adopt an underground continuous wall form. Compared with a traditional leaning scheme that soil behind a working well is used for reinforcement, the large-section rectangular pipe jacking tunnel leaning device can remarkably improve leaning jacking force, has the advantages of being safe, reliable, economical and applicable, is particularly suitable for long-distance and / or large-section rectangular pipe jacking tunnel projects with large jacking force requirements, and has a wide application prospect. And the method has high engineering application value.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of tunnel engineering, and specifically relates to a large-section rectangular jacking pipe tunnel backrest device. BACKGROUND

[0002] With the increasing number of long-distance and / or large-section rectangular jacking pipe tunnel projects, the demand for jacking force is also increasing. At present, the jacking pipe tunnel mainly adopts the scheme of backrest reinforcement and / or additional relay station to solve the problem of insufficient jacking force. The existing conventional jacking pipe backrest mainly adopts the technical scheme of reinforcing the soil body behind the working well to provide backrest reaction force and setting a combined steel backrest structure in the working well to transfer the jacking force. However, this scheme has the following problems when applied to long-distance and / or large-section jacking pipes: the provided jacking force is limited and cannot meet the requirement of large jacking force; under large jacking force, the steel backrest system has the risk of instability; the reinforcement range of the soil body is highly empirical, has weak theoretical basis and low reliability; and the reinforcement body is only used for temporary engineering and has poor economy. For long-distance and / or large-section rectangular jacking pipes, although the method of setting a relay station during the implementation of the jacking pipe can overcome the problem of insufficient backrest jacking force, it will also cause problems such as complicated process, low efficiency and increased cost. SUMMARY

[0003] To solve the above technical problems, the utility model provides a large-section rectangular jacking pipe tunnel backrest device which can provide large jacking force for large-section rectangular jacking pipe tunnels. During the jacking process of the jacking pipe, the rigid backrest structure in the working well uniformly transfers the large jacking force of the large-section rectangular jacking pipe tunnel to the tunnel structure and continuous wall body behind, and the jacking force reaction force is provided by the side friction and passive earth pressure between the tunnel structure and continuous wall body and the rock-soil body.

[0004] To achieve the above purpose, the utility model specifically adopts the following technical means:

[0005] A large-section rectangular jacking pipe tunnel backrest device which includes a rigid backrest located on the backrest side of the rectangular jacking pipe and pre- implemented in the working well, a tunnel structure and a continuous wall body, and can provide large jacking force for large-section rectangular jacking pipe tunnels. One side of the rigid backrest is adjacent to the rectangular jacking pipe, and the other side is connected to the tunnel structure. The continuous wall body is connected to the lower part of the tunnel structure. The rigid backrest is used to uniformly transfer the large jacking force of the large-section rectangular jacking pipe tunnel to the tunnel structure and continuous wall body behind, and the jacking force reaction force is provided by the side friction and passive earth pressure between the tunnel structure and continuous wall body and the rock-soil body.

[0006] Further, the rigid backrest in the working well can also serve as a temporary weight measure in the working well, reducing the cost of temporary anti-floating measures and improving the economy.

[0007] Further, the rigid backrest is a prefabricated reinforced concrete structure which is integrally connected with the tunnel structure and the continuous wall body.

[0008] Further, the tunnel structure is preferably a tunnel structure in a permanent use stage, which comprises a top plate, side walls and a bottom plate, and the top plate, side walls and bottom plate of the tunnel main structure are connected to each other. When a tunnel is constructed by using an open excavation process, the tunnel structure can comprise a retaining wall, and when there is a retaining wall, the retaining wall is connected to the top plate, side walls and bottom plate of the tunnel main structure.

[0009] Further, the continuous wall is an underground continuous wall or a TRD continuous wall, which is connected to the bottom plate of the tunnel structure and a rigid back support. When the reaction force transmitted by the rigid back support is distributed to the tunnel structure and the continuous wall, the mechanical balance of the structural system should be met.

[0010] The utility model has the following beneficial effects:

[0011] Different from a conventional scheme of providing a back support reaction force only by reinforcing soil behind a working well, the device uses a tunnel structure and a continuous wall to bear a top force reaction force, significantly improves the back support top force, and can meet the demand of a long-distance and / or large-section rectangular top pipe tunnel for a large top force. A prefabricated and assembled reinforced concrete structure with large rigidity is used as a rigid back support in the working well, overcomes the instability risk of a conventional steel back support system under a large top force, and ensures that the top force is uniformly and stably transmitted to the structure behind.

[0012] When the reaction force transmitted by the rigid back support is distributed to the tunnel structure and the continuous wall, the mechanical balance of the structural system is met, the safety and reliability of the entire back support device in the process of bearing the top force are ensured, and the structure can stably operate in the process of top pipe construction.

[0013] The rigid back support in the working well can also serve as a temporary weight measure in the working well, reduces the cost of temporary anti-floating measures, saves the cost of temporary structures, and avoids problems such as complicated procedures and increased cost caused by setting a relay station. The device is especially suitable for long-distance and / or large-section rectangular top pipe tunnel projects with a large demand for top force, has high engineering application value, and can be widely applied to the field of similar tunnel projects. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 is a front view of a large-section rectangular top pipe back support device of the utility model;

[0015] Fig. 2 is another front view of a large-section rectangular top pipe back support device of the utility model;

[0016] Fig. 3 is a component diagram of a large-section rectangular top pipe back support device of the utility model.

[0017] The numbers in the figure: 1, rectangular jacking pipe; 2, jacking pipe working well; 3, back leaning structure; 4, tunnel structure; 5, continuous wall; 6, top plate; 7, side wall; 8, bottom plate; 9, enclosure wall. DETAILED DESCRIPTION

[0018] The other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the present application. The present application can also be implemented or applied in different specific embodiments, and the details in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the drawings provided in the following examples only schematically illustrate the basic concept of the present application, and the following examples and features in the examples can be combined with each other without conflict.

[0019] The drawings are only used for illustrative purposes, and the representation is only a schematic diagram, not a physical diagram, and should not be understood as a limitation of the present application. In order to better illustrate the embodiments of the present application, some components in the drawings are omitted, enlarged or reduced, and do not represent the actual size of the product. For those skilled in the art, the omission of some well-known structures and their descriptions in the drawings is understandable.

[0020] Please refer to Figs. 1-3 The large-section rectangular jacking pipe tunnel back leaning device provided by the present application mainly comprises a rigid back leaning 3 located at the back leaning side of the rectangular jacking pipe 1 and preformed in the working well, a tunnel structure 4, and a continuous wall 5. Among them, the rigid back leaning 3, the tunnel structure 4 and the continuous wall 5 can be selected and combined according to the required jacking force. The back leaning continuous wall of the working well can be set according to the construction organization and the jacking force requirement. The tunnel structure 4 covers the tunnel main structure top plate 6, side wall 7 and bottom plate 8 and other structure parts in contact with the geotechnical medium. When the open excavation process is used for construction, the enclosure wall 9 is also included. The back leaning device can provide strong jacking force support for the large-section rectangular jacking pipe tunnel.

[0021] In the actual construction process, taking a large-section rectangular jacking pipe tunnel project as an example, the cross-sectional size is 9.9m x 8.15m, designed for double-line jacking pipe 1, the single-line jacking length is 445m, and the estimated maximum jacking force is about 10000 tons. The specific implementation of the jacking pipe back leaning device is as follows:

[0022] 1) The rigid backrest 3 structure in the working well is constructed by prefabricated and assembled reinforced concrete with a thickness of 1000 mm, and is integrally connected with the underground continuous wall of the working well and the inner lining structure, with a vertical dimension of 11.9m x 10.15m (the dimension of the rectangular top pipe tunnel section with an extension of 1m), so as to ensure that the estimated 10000 tons of jacking force required by the large-section rectangular top pipe 1 tunnel can be uniformly and stably transmitted to the tunnel structure 4 and the continuous wall 5 behind, effectively ensuring the stability and reliability of the jacking force transmission.

[0023] 2) The tunnel structure 4 in the top pipe backrest device fully utilizes the tunnel main structure and the underground continuous wall of the foundation enclosure structure in the permanent use stage, and the longitudinal length of the tunnel structure 4 in this section is set to 50m. According to the calculation and design based on the structural system mechanics balance principle, the tunnel structure 4 can provide a counterforce of about 7200 tons.

[0024] 3) The continuous wall 5 is arranged below the bottom plate 8 of the tunnel structure 4, and in this project, two underground continuous walls with a length of 50m, a depth of 15m and a thickness of 0.8m are used. Based on the same structural system mechanics balance, it can provide a counterforce of about 2800 tons, and can also be used as a tunnel permanent anti-floating measure in the later stage, further improving the stability and safety of the entire tunnel project.

[0025] 4) The entire structure system described above has been completed before the top pipe jacking construction, effectively avoiding the disadvantage that the backrest area construction often becomes the key node for controlling the construction period in the traditional backrest scheme, greatly improving the construction efficiency and ensuring the smooth progress of the project progress.

[0026] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some technical features. Any modification, equivalent substitution, improvement, etc. made within the spirit and principles of the present application shall be covered within the protection scope of the present application.

Claims

1. A large-section rectangular jacking pipe tunnel rear leaning device, characterized in that, The application relates to a large-section rectangular pipe (1) tunnel structure, which comprises a rigid backrest (3) located at the back of the rectangular pipe (1) and previously implemented in a working well, a tunnel structure (4) and a continuous wall (5), one side of the rigid backrest (3) is adjacent to the rectangular pipe (1), the other side is connected with the tunnel structure (4), the continuous wall (5) is connected below the tunnel structure (4), the rigid backrest (3) is used for uniformly transmitting large top force of the large-section rectangular pipe tunnel to the tunnel structure (4) and the continuous wall (5) behind, and the top force reaction force is provided by the side frictional resistance and passive earth pressure between the tunnel structure (4) and the continuous wall (5) and the rock-soil body.

2. The large cross-section rectangular pipe jacking tunnel rear leaning device according to claim 1, characterized in that, The rigid backrest (3) is a prefabricated assembled reinforced concrete structure, which is integrally connected with the tunnel structure (4) and the continuous wall (5).

3. The large-section rectangular pipe jacking tunnel rear supporting device according to claim 1, characterized in that, The tunnel structure (4) comprises a top plate (6), a side wall (7) and a bottom plate (8), the top plate (6), the side wall (7) and the bottom plate (8) of the tunnel structure (4) are connected with each other, and when there is a surrounding structure wall (9), the surrounding structure wall (9) is connected with the top plate (6), the side wall (7) and the bottom plate (8) of the tunnel structure (4).

4. The large cross-section rectangular pipe jacking tunnel rear supporting device according to claim 1, characterized in that, The continuous wall (5) is an underground continuous wall or a TRD continuous wall, which is connected with the bottom plate (8) of the tunnel structure (4) and the rigid backrest (3).

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