Tunnel secondary lining steel frame stable structure

Abstract

The utility model discloses a tunnel secondary lining steel frame stabilizing structure, comprising a plurality of steel arch frames, the steel arch frames are located between the longitudinal main reinforcement and the circumferential main reinforcement of the secondary lining steel frame, the steel arch frames support the longitudinal main reinforcement of the secondary lining steel frame, the two ends of the steel arch frames are fixedly connected to the inverted arch bottom plate, and the steel arch frames are fixedly connected by a plurality of connecting rods. Compared with the prior art, the utility model can effectively support and position the secondary lining steel frame of a large-section flat tunnel, and improve its self-stabilizing ability.

Description

Technical Field

[0001] The utility model belongs to the field of tunnel construction, and in particular relates to a stable structure of a secondary lining steel bar skeleton used in secondary lining of a tunnel. Background Art

[0002] The secondary lining of a tunnel is a cast concrete or reinforced concrete lining constructed on the inner side of the primary support during tunnel construction, and together with the primary support, it forms a composite lining. Compared with the primary support, the secondary lining refers to the inner lining constructed with concrete and other materials after the primary support of the tunnel has been carried out, in order to achieve the functions of strengthening the support, optimizing the route drainage system, beautifying the appearance, and facilitating the installation of communication, lighting, monitoring and other facilities, so as to meet the requirements of modern highway tunnel construction.

[0003] In the construction of the secondary lining of the tunnel, it is necessary to construct an inverted arch at the bottom of the tunnel, pour concrete to form the inverted arch bottom plate, and set up a secondary lining steel frame on the basis of the inverted arch bottom plate, and pour concrete on the secondary lining steel frame through a trolley to form the inner lining. Among them, the secondary lining steel frame consists of longitudinal main bars, annular main bars and tie bars, and the tie bar rings are staggered between the longitudinal main bars and the annular main bars.

[0004] For large-section flat tunnels, the longitudinal main reinforcement and circumferential main reinforcement of the secondary lining steel frame are prone to downward flexural deformation, resulting in insufficient thickness of the local steel protection layer. The steel bars are susceptible to external environmental corrosion, causing steel rust channels and thus affecting the durability of the structure. In addition, due to the large and relatively flat cross-section, the secondary lining steel frame is not stable enough, and there is a risk of instability and collapse of the steel frame. Utility Model Content

[0005] The utility model aims to overcome the stability problem of the existing second lining steel frame of a large-section flat tunnel, and to provide a tunnel second lining steel frame stabilizing structure which can effectively support and position the second lining steel frame of a large-section flat tunnel and improve its self-stabilizing ability.

[0006] The utility model adopts a technical solution to solve the technical problem: a tunnel secondary lining steel frame stabilizing structure, comprising a plurality of steel arch frames, the steel arch frames are located between the longitudinal main reinforcement and the annular main reinforcement of the secondary lining steel frame, the steel arch frames support the longitudinal main reinforcement of the secondary lining steel frame, the two ends of the steel arch frames are fixedly connected to the invert bottom plate, and the steel arch frames are fixedly connected by a plurality of connecting rods.

[0007] Optionally, the steel arch frame is composed of a plurality of steel sections, which are fixedly connected by connectors to form an arch shape adapted to the tunnel, and the steel sections are I-beams.

[0008] Optionally, the connecting member is composed of two connecting steel plates, the two connecting steel plates are fixedly connected by bolts and nuts, the steel section is fixedly connected to the connecting steel plates, and a reinforcing rib is provided between the steel section and the connecting steel plates.

[0009] Optionally, positioning steel plates are provided between the two ends of the steel arch frame and the inverted arch bottom plate, the two ends of the steel arch frame are fixed to the positioning steel plates, and the positioning steel plates and the inverted arch bottom plate are fixedly connected by expansion bolts.

[0010] The use method and principle of the utility model are as follows: when in use, it is necessary to wait until the inverted arch bottom plate is finalized and stabilized, then install the steel arch frame and set up the secondary lining steel frame on its basis, the two ends of the steel arch frame are fixed on the inverted arch bottom plate, connecting rods are welded between adjacent steel arch frames, and further, connecting rods can be arranged between the steel arch frame and the upper section of secondary lining concrete, the steel arch frame presses the longitudinal main reinforcement of the secondary lining steel frame against the inner wall of the tunnel, and after the overall formation, the trolley casting is carried out;

[0011] The principle of the utility model is to support and position the longitudinal main reinforcement of the secondary lining steel frame by a steel arch frame to prevent it from flexing and deforming downward. Since the annular main reinforcement of the secondary lining steel frame is connected to the longitudinal main reinforcement by tie bars, the annular main reinforcement can also be prevented from flexing and deforming downward. Since the force applied to the secondary lining steel frame can be transmitted to the steel arch frame and then to the bottom plate of the invert via the steel arch frame, the self-stabilizing ability of the secondary lining steel frame can be effectively improved to prevent it from deforming and overturning, thereby reducing safety risks and improving quality levels.

[0012] Compared with the prior art, the utility model has at least the following beneficial effects: the utility model can effectively support and position the secondary lining steel skeleton of a large-section flat tunnel, thereby improving its self-stabilizing ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the connection structure between the steel arch frames of the utility model;

[0015] Figure 3 It is a schematic diagram of the connection structure between steel sections of the utility model;

[0016] The components described in the accompanying drawings are marked as follows: steel arch frame 1, longitudinal main reinforcement 2, annular main reinforcement 3, arch bottom plate 4, connecting rod 5, steel section 6, connecting piece 7, connecting steel plate 8, and positioning steel plate 9. DETAILED DESCRIPTION

[0017] Embodiment 1, below combines Figure 1 , Figure 2 and Figure 3To further illustrate the utility model, the tunnel secondary lining steel frame stabilizing structure comprises a plurality of steel arch frames 1, the steel arch frames are located between the longitudinal main reinforcement 2 and the annular main reinforcement 3 of the secondary lining steel frame, the steel arch frames support the longitudinal main reinforcement of the secondary lining steel frame, the two ends of the steel arch frames are fixedly connected to the arch bottom plate 4, the steel arch frames are fixedly connected by a plurality of connecting rods 5, the connecting rods are steel pipes, and the two ends thereof are respectively welded to adjacent steel arch frames.

[0018] In order to facilitate the installation of the steel arch frame in the tunnel, the steel arch frame is composed of multiple steel sections 6. The steel sections are straight and curved. The steel sections are fixedly connected by connecting members 7 to form an arch shape suitable for the tunnel. The steel sections are I-beams. The connecting members are composed of two connecting steel plates 8. The two connecting steel plates are fixedly connected by bolts and nuts. The steel sections are vertically welded to the connecting steel plates, and reinforcing ribs are welded between the steel sections and the connecting steel plates.

[0019] In order to better transfer the force on the steel arch frame to the arch bottom plate, a positioning steel plate 9 is provided between the two ends of the steel arch frame and the arch bottom plate. The two ends of the steel arch frame are vertically welded to the positioning steel plate, and the positioning steel plate and the arch bottom plate are fixedly connected by expansion bolts.

[0020] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A tunnel secondary lining steel frame stabilizing structure, comprising a plurality of steel arch frames (1), characterized in that: The steel arch frame is located between the longitudinal main reinforcement (2) and the circumferential main reinforcement (3) of the secondary lining reinforcement skeleton, the steel arch frame supports the longitudinal main reinforcement of the secondary lining reinforcement skeleton, the two ends of the steel arch frame are fixedly connected to the inverted arch bottom plate (4), and the steel arch frames are fixedly connected via a plurality of connecting rods (5).

2. The tunnel secondary lining steel frame stabilization structure according to claim 1 is characterized by: The steel arch frame is composed of a plurality of steel sections (6), the steel sections are fixedly connected by connecting pieces (7) to form an arch shape suitable for the tunnel, and the steel sections are I-beams.

3. The tunnel secondary lining steel frame stabilization structure according to claim 2 is characterized by: The connecting piece is composed of two connecting steel plates (8), the two connecting steel plates are fixedly connected by bolts and nuts, the steel section is fixedly connected to the connecting steel plate, and a reinforcing rib is provided between the steel section and the connecting steel plate.

4. The tunnel secondary lining steel frame stabilization structure according to claim 1 is characterized by: Positioning steel plates (9) are provided between the two ends of the steel arch frame and the inverted arch bottom plate, the two ends of the steel arch frame are fixed to the positioning steel plates, and the positioning steel plates and the inverted arch bottom plate are fixedly connected by expansion bolts.

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