A rapid installation device for steel arch frames in tunnels with unstable surrounding rock

Abstract

This invention provides a rapid installation device for steel arch frames in tunnels with unstable surrounding rock. The device includes several steel arch frames, each equipped with legs and a base arch. The legs and base arch are connected by a connecting mechanism. The connecting mechanism includes a first connecting steel plate and a second connecting steel plate. The legs are connected to the first connecting steel plate, and the base arch is connected to the second connecting steel plate. The first and second connecting steel plates are connected by a connecting assembly. This rapid installation device for steel arch frames in tunnels with unstable surrounding rock connects the legs and base arch through the connecting mechanism. The inclusion of limiting components and connecting assemblies facilitates rapid installation of the steel arch frames. Then, longitudinal connections of the steel arch frames in each section are achieved through connecting steel bars, thus realizing rapid overall installation.

Description

Technical Field

[0001] This utility model belongs to the field of chemical industry, and in particular relates to a rapid installation device for steel arch frames in tunnels with unstable surrounding rock. Background Technology

[0002] Rapid installation technology for steel arch frames represents a key breakthrough in tunnel construction in unstable surrounding rock. In confined spaces, traditional welding connections suffer from long construction cycles and complex procedures, failing to meet the stringent time-efficiency requirements of support in weak and fractured rock sections. The rapid installation device for steel arch frames described in this invention, through its connecting mechanism, enables timely closure of the support structure before significant deformation of the surrounding rock, effectively suppressing the development of rock relaxation and reducing the risk of secondary disasters such as spalling and collapse caused by prolonged rock exposure. This provides a safety guarantee for tunnel construction under complex geological conditions. Summary of the Invention

[0003] In view of this, the present invention aims to overcome the defects in the prior art and proposes a rapid installation device for steel arch frames in tunnels with unstable surrounding rock.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] A rapid installation device for steel arch frames in tunnels with unstable surrounding rock includes several steel arch frames, each equipped with legs and a bottom arch, the legs and the bottom arch being connected by a connecting mechanism.

[0006] The connecting mechanism includes a first connecting steel plate and a second connecting steel plate. The support leg is connected to the first connecting steel plate, and the bottom arch is connected to the second connecting steel plate. The first connecting steel plate and the second connecting steel plate are connected by a connecting assembly.

[0007] Furthermore, the first connecting steel plate and the second connecting steel plate have the same structure.

[0008] Furthermore, the upper surface of the first connecting steel plate is connected to the second connecting steel plate, and the lower surface of the first connecting steel plate is provided with a limiting component. The limiting component includes two limiting members with the same structure, which are arranged opposite to each other. The web of the outrigger is located between the limiting members, and the limiting members are located between the flanges of the outrigger.

[0009] Furthermore, the limiting components include flange blocks and two belly blocks. The two ends of the flange blocks are connected to the corresponding belly blocks via connecting strips. The belly blocks limit the movement of the web plate, and the flange blocks limit the movement of the flange plate, facilitating quick determination of the welding positions between the outrigger and the connecting steel plate during installation.

[0010] Furthermore, the connecting assembly includes a protective plate and two clamping sleeves. The two ends of the protective plate are respectively connected to the clamping sleeves. The protective plate is located outside the first connecting steel plate and the second connecting steel plate, and the clamping sleeves are fitted onto the first connecting steel plate and the second connecting steel plate.

[0011] Furthermore, a clamping pad is provided on the inner side of the end of the clamping sleeve.

[0012] Furthermore, both the first and second connecting steel plates have a plurality of bolt holes, and the first and second connecting steel plates are connected by bolts. Bolt holes are symmetrically pre-drilled at the four corners of the connecting steel plates, and the legs and the bottom arch are connected by bolts after the four corner bolt holes of the connecting steel plates are aligned.

[0013] Furthermore, the steel arch frames are connected by connecting steel bars. After installation, the first and second steel arch frames in the first section are longitudinally connected by first-section connecting steel bars. The first-section connecting steel bars have a reverse thread at the beginning and a straight thread at the end. The reverse thread at the beginning passes through the connecting steel bar hole in the web of the first steel arch frame and is secured with lock nuts on both the front and rear sides of the web. The straight thread at the end passes through the connecting steel bar hole in the web of the second steel arch frame and is secured with a reverse thread sleeve at the rear of the web. The steel arch frames in the standard section are longitudinally connected by standard section connecting steel bars. The standard section connecting steel bars have a reverse thread at the beginning and a straight thread at the end. The reverse thread at the beginning of the standard section connecting steel bars is connected to the reverse thread sleeve at the end of the first section connecting steel bar. The straight thread at the end of the standard section connecting steel bars passes through the connecting steel bar hole in the web of the next steel arch frame and is secured with lock nuts in front of the web and with a reverse thread sleeve at the rear of the web. The remaining steel arch frames in the standard section are connected longitudinally in a cyclical manner, repeating the connection process described above for the standard sections.

[0014] Compared with the prior art, this utility model has the following advantages:

[0015] The steel arch frame quick installation device for unstable surrounding rock tunnels described in this utility model connects the legs to the bottom arch through a connecting mechanism. The setting of limiting parts and connecting components facilitates the quick installation of the steel arch frame. Then, the longitudinal connection of the steel arch frames in each zone is achieved through connecting steel bars, thus realizing the overall quick installation.

[0016] The rapid installation device for steel arch frames in unstable surrounding rock tunnels described in this utility model adopts prefabricated components and mechanized installation technology, shortening the construction cycle time and significantly improving the tunneling speed. Its rapid ring-forming characteristic (closing before significant deformation of the surrounding rock) reduces support lag time and avoids construction delays caused by traditional welding processes; it forms an active support system, precisely controlling the deformation of the surrounding rock within 3‰ of the design value through pre-tightening force application and modular adjustment; the modular design can adapt to 30mm-level differential deformation, effectively coping with the complex deformation characteristics of Class IV-V surrounding rock; it reduces the exposure time of the surrounding rock, lowering the risk of secondary disasters such as spalling and collapse, and improving the bearing efficiency of the support structure; in adverse geological sections such as water-rich fault zones and high-stress areas, rapid closure maintains the self-supporting capacity of the surrounding rock, avoiding chain instability caused by stress redistribution; the installation accuracy of the support structure reaches ±5mm, improving the tightness with the surrounding rock and reducing the back void rate to below 5%; the overall project qualification rate exceeds 98.5%, providing stable boundary conditions for subsequent secondary lining construction and reducing later repair costs. Attached Figure Description

[0017] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0018] Figure 1 This is a schematic diagram of the rapid installation device for steel arch frames in unstable surrounding rock tunnels according to an embodiment of the present invention;

[0019] Figure 2 This is a top view of the first connecting steel plate described in an embodiment of the present utility model;

[0020] Figure 3 This is a schematic diagram of the longitudinal elevation of the steel arch frame described in an embodiment of the present utility model;

[0021] Figure 4 This is a magnified view of a portion of point A.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Outrigger; 2. Bottom arch; 3. Connecting mechanism; 31. First connecting steel plate; 32. Second connecting steel plate; 311. Abdomen block; 312. Flange block; 313. Connecting strip; 314. Protective plate; 315. Clamping sleeve; 316. Clamping pad; 317. Bolt hole; 318. Bolt; 4. Web plate; 5. Flange plate; 6. Connecting reinforcement. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0025] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] like Figure 1-4 As shown, a rapid installation device for steel arch frames in unstable surrounding rock tunnels includes several steel arch frames. Each steel arch frame is equipped with legs 1 and a bottom arch 2, which are connected by a connecting mechanism 3. The connecting mechanism 3 includes a first connecting steel plate 31 and a second connecting steel plate 32. The legs 1 are connected to the first connecting steel plate 31, and the bottom arch 2 is connected to the second connecting steel plate 32. The first connecting steel plate 31 and the second connecting steel plate 32 are connected by a connecting assembly. The bottom web plate 4 and flange plate 5 of the legs 1 are welded to the connecting plate; the bottom web plate 4 and flange plate 5 of the bottom arch 2 are also welded to the connecting plate.

[0029] The first connecting steel plate 31 and the second connecting steel plate 32 have the same structure. The upper surface of the first connecting steel plate 31 is connected to the second connecting steel plate 32. The lower surface of the first connecting steel plate 31 is provided with a limiting component, which includes two limiting members with the same structure. The limiting members are arranged opposite to each other. The web plate 4 of the outrigger 1 is located between the limiting members, and the limiting members are located between the flange plates 5 of the outrigger 1.

[0030] The limiting components include flange blocks 312 and two belly blocks 311. The two ends of the flange blocks 312 are connected to the corresponding belly blocks 311 via connecting strips 313. The belly blocks 311 limit the movement of the web plate 4, and the flange blocks 312 limit the movement of the flange plate 5, facilitating quick determination of the welding position between the outrigger 1 and the connecting steel plate during installation.

[0031] The connecting assembly includes a protective plate 314 and two clamping sleeves 315. Both ends of the protective plate 314 are connected to the clamping sleeves 315. The protective plate 314 is located outside the first connecting steel plate 31 and the second connecting steel plate 32. The clamping sleeves 315 are fitted onto the first connecting steel plate 31 and the second connecting steel plate 32. A clamping pad 316 is provided on the inner side of the end of each clamping sleeve 315.

[0032] Both the first connecting steel plate 31 and the second connecting steel plate 32 have a plurality of bolt holes 318 317, and the first connecting steel plate 31 and the second connecting steel plate 32 are connected by bolts 318. The four corners of the connecting steel plates have symmetrically reserved bolt holes 318 317. The support leg 1 and the bottom arch 2 are connected by installing bolts 318 after aligning the four corner bolt holes 318 317 on the connecting steel plates.

[0033] The steel arch frames are connected by connecting steel bars 6. After the steel arch frames are installed, the first and second steel arch frames in the first section are connected longitudinally using first-section connecting steel bars 6. The first-section connecting steel bars 6 have a reverse thread at the beginning and a straight thread at the end. The reverse thread at the beginning passes through the hole of the connecting steel bar 6 in the web plate 4 of the first steel arch frame and is secured with lock nuts on both sides of the web plate 4. The straight thread at the end passes through the hole of the connecting steel bar 6 in the web plate 4 of the second steel arch frame and is secured with a sleeve with both reverse and straight threads at the rear of the web plate 4. In the standard section, the steel arch frames are connected longitudinally using standard section connecting steel bars 6. The standard section connecting steel bars 6 have a reverse thread at the beginning and a straight thread at the end. The reverse thread at the beginning of the standard section connecting steel bars 6 connects to the sleeve with both reverse and straight threads at the end of the first-section connecting steel bars 6. The straight thread at the end of the standard section connecting steel bars 6 passes through the hole of the connecting steel bar 6 in the web plate 4 of the next steel arch frame and is secured with lock nuts in front of the web plate 4, and then secured with a sleeve with both reverse and straight threads at the rear of the web plate 4. The remaining standard section steel arch frames are connected longitudinally in a cyclical manner, repeating the connection process described above for the standard section.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rapid installation device for steel arch frames in tunnels with unstable surrounding rock, characterized in that: It includes several steel arch frames, each equipped with legs and a bottom arch, which are connected by a connecting mechanism. The connecting mechanism includes a first connecting steel plate and a second connecting steel plate. The support leg is connected to the first connecting steel plate, and the bottom arch is connected to the second connecting steel plate. The first connecting steel plate and the second connecting steel plate are connected by a connecting assembly.

2. The rapid installation device for steel arch frames in unstable surrounding rock tunnels according to claim 1, characterized in that: The first connecting steel plate and the second connecting steel plate have the same structure.

3. The rapid installation device for steel arch frames in unstable surrounding rock tunnels according to claim 2, characterized in that: The upper surface of the first connecting steel plate is connected to the second connecting steel plate. The lower surface of the first connecting steel plate is provided with a limiting component. The limiting component includes two limiting members with the same structure. The limiting members are arranged opposite to each other. The web of the leg is located between the limiting members. The limiting members are located between the flanges of the leg.

4. The rapid installation device for steel arch frames in unstable surrounding rock tunnels according to claim 3, characterized in that: The limiting component includes a flange stop and two belly stops, with each end of the flange stop connected to the corresponding belly stop via a connecting strip.

5. The rapid installation device for steel arch frames in unstable surrounding rock tunnels according to claim 1, characterized in that: The connecting assembly includes a protective plate and two clamping sleeves. The two ends of the protective plate are respectively connected to the clamping sleeves. The protective plate is located outside the first connecting steel plate and the second connecting steel plate, and the clamping sleeves are fitted onto the first connecting steel plate and the second connecting steel plate.

6. The rapid installation device for steel arch frames in unstable surrounding rock tunnels according to claim 5, characterized in that: A clamping pad is provided on the inner side of the end of the clamping sleeve.

7. The rapid installation device for steel arch frames in unstable surrounding rock tunnels according to claim 1, characterized in that: Both the first connecting steel plate and the second connecting steel plate have several bolt holes, and the first connecting steel plate and the second connecting steel plate are connected by bolts.

8. The rapid installation device for steel arch frames in unstable surrounding rock tunnels according to claim 1, characterized in that: The steel arch frames are connected by reinforcing bars.

Images