Tensioning steel arch support structure for tunnel surrounding rock protection

Abstract

The utility model discloses a tensioning steel arch support structure for tunnel surrounding rock protection, which comprises a plurality of steel arch sections on the inner side of tunnel surrounding rock, mounting plates are arranged at two ends of each steel arch section, and each steel arch section comprises two steel arch bodies fixedly connected with the two mounting plates respectively; the first hinge seat is arranged between the two steel arch frame bodies, and the two steel arch frame bodies are hinged through the first hinge seat; the second tensioning assembly is arranged at the bottoms of the two steel arch frame bodies and used for changing the angle of the two steel arch frame bodies, two first lead screws are driven to move in the opposite directions through rotation of a first threaded sleeve, the distance between the upper flange and the tunnel surrounding rock is adjusted, the upper flange is tightly attached to the tunnel surrounding rock, and the steel arch frame bodies are tensioned. The two second screw rods are driven to move oppositely through rotation of the second threaded sleeves, so that the angle between the two steel arch frame bodies is changed, the radian of the steel arch frame is adjustable, and the steel arch frame can be matched with a tunnel surrounding rock structural surface within a certain range.

Description

Technical Field

[0001] The present application relates to the field of steel arch frames, and in particular to a tensioned steel arch frame support structure for tunnel surrounding rock protection. Background Art

[0002] With the continuous improvement of tunnel engineering technology, my country's tunnel engineering construction has gradually tended to develop in terms of deep burial, long distance, and large cross-section. The stability of the surrounding rock and the safety of the support structure of the tunnel under complex geological environment will become more and more prominent, showing the characteristics of large deformation of the tunnel surrounding rock and accelerated displacement rate, which has brought serious problems to the support technology, construction technology and long-term safety and stability research of underground engineering.

[0003] However, in the process of implementing relevant technical solutions, at least the following technical problems were found: in tunnel construction, a support method combining multiple protective structures is usually adopted. Currently, the more commonly used support measures are a combination of anchor rods, sprayed concrete, steel mesh and steel arch frames to control the deformation of the tunnel surrounding rock. However, the production and construction of traditional steel arch frames are relatively inconvenient. The steel arch frames of tunnel construction in multiple projects cannot be used interchangeably and are unique. In addition, when the tunnel arch crown settles or the tunnel body converges unevenly, the steel arch frame cannot fit well with the tunnel surrounding rock. At this time, the protective capacity of the steel arch frame is reduced, affecting the support capacity of the tunnel. Utility Model Content

[0004] The present application solves the problem of the mismatch between the steel arch frame and the tunnel in the prior art by providing a tensioned steel arch frame support structure for tunnel surrounding rock protection, thereby achieving a close fit between the steel arch frame and the tunnel surrounding rock.

[0005] The present application provides a tensioned steel arch support structure for tunnel surrounding rock protection, comprising a plurality of steel arch segments on the inner side of the tunnel surrounding rock, both ends of the plurality of steel arch segments being provided with mounting plates, the plurality of steel arch segments comprising: two steel arch bodies, respectively fixedly connected to the two mounting plates; a first hinge seat, arranged between the two steel arch bodies, and the two steel arch bodies being hinged through the first hinge seat; a second tensioning assembly, arranged at the bottom of the two steel arch bodies, and the second tensioning assembly being used to change the angle of the two steel arch bodies.

[0006] Furthermore, a through groove is opened in the middle of the two steel arch frame bodies, and two first tensioning components for fitting with the surrounding rock of the tunnel are arranged inside the through groove.

[0007] Furthermore, the first tensioning assembly includes: a first threaded sleeve, arranged inside the steel arch frame segment; two first threaded grooves, opened at both ends of the first threaded sleeve; a first screw rod, threadedly connected to the inside of the first threaded groove, and the first screw rod at the bottom of the first threaded sleeve is fixedly connected to the steel arch frame body; an upper flange, fixedly arranged on the top of another first screw rod, and the upper flange is in contact with the tunnel surrounding rock.

[0008] Furthermore, the second tensioning assembly includes: two pairs of second hinged seats, symmetrically arranged at the bottom of the middle part of the two steel arch frame bodies; a second threaded sleeve, arranged between the two second hinged seats; two second threaded grooves, opened at both ends of the second threaded sleeve; a second screw rod, threadedly connected to the inside of the second threaded groove, and the two second screw rods are hinged to the two second hinged seats at one end away from the second threaded sleeve.

[0009] Furthermore, bolt holes are provided on both sides of the mounting plate, and fastening bolts are provided inside the two bolt holes.

[0010] The technical solution provided by this application has at least the following technical effects or advantages:

[0011] The rotation of the first threaded sleeve drives the two first screw rods to move toward each other, and adjusts the distance between the upper flange and the tunnel surrounding rock, so that the upper flange is in close contact with the tunnel surrounding rock, thereby achieving fine-tuning of the steel arch frame at a certain position, and better fitting with the tunnel surrounding rock when unbalanced deformation of the tunnel surrounding rock occurs. The rotation of the second threaded sleeve drives the two second screw rods to move toward each other, so that the angle between the two steel arch frame bodies changes, making the curvature of the steel arch frame adjustable, and realizing that the steel arch frame can fit the tunnel surrounding rock structure surface within a certain range. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the overall structure of the steel arch frame in the embodiment of the present application;

[0013] Figure 2 This is a schematic diagram of the cross-sectional structure of a steel arch frame segment in an embodiment of the present application;

[0014] Figure 3 This is a schematic diagram of the structure of the second tensioning assembly in the embodiment of the present application;

[0015] Figure 4 This is a schematic diagram of the structure of the first tensioning assembly in the embodiment of the present application;

[0016] In the figure: 10, tunnel surrounding rock; 20, steel arch frame segment; 30, mounting plate; 40, bolt hole; 21, steel arch frame body; 22, through groove; 23, first tensioning assembly; 24, first hinged seat; 25, second tensioning assembly; 231, first threaded sleeve; 232, first threaded groove; 233, first screw rod; 234, upper flange; 251, second hinged seat; 252, second threaded sleeve; 253, second threaded groove; 254, second screw rod. DETAILED DESCRIPTION

[0017] The embodiment of the present application discloses a tensioned steel arch support structure for tunnel surrounding rock protection. By rotating the first threaded sleeve 231 and the second hinged seat 251, the distance between the two first screw rods 233 and the two second screw rods 254 is adjusted, so that the upper flange 234 can be in close contact with the tunnel surrounding rock 10, and the angle between the two steel arch frame bodies 21 changes, so that the curvature of the steel arch frame body 21 is adjustable, thereby improving the applicability of the steel arch frame.

[0018] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0019] Please refer to Figure 1 , Figure 2 and Figure 3The present embodiment provides a tensioned steel arch support structure for tunnel surrounding rock protection, including a plurality of steel arch segments 20 inside the tunnel surrounding rock 10, a mounting plate 30 is provided at both ends of the plurality of steel arch segments 20, a bolt hole 40 is provided on both sides of the mounting plate 30, and fastening bolts are provided inside the two bolt holes 40, and the plurality of steel arch segments 20 include a steel arch body 21, a through groove 22, a first tensioning assembly 23, a first hinge seat 24, and a second tensioning assembly 25, and one end of the two steel arch bodies 21 is respectively connected to the two mounting The plate 30 is fixedly connected, the first hinge seat 24 is arranged between the two steel arch frame bodies 21, and the two steel arch frame bodies 21 are hinged through the first hinge seat 24, the second tensioning assembly 25 is arranged at the bottom of the two steel arch frame bodies 21, and the second tensioning assembly 25 is used to change the angle of the two steel arch frame bodies 21, the second tensioning assembly 25 includes a second hinge seat 251, a second threaded sleeve 252, a second threaded groove 253, and a second screw rod 254, and two pairs of second hinge seats 251 are symmetrically arranged at the bottom of the middle part of the two steel arch frame bodies 21, The second threaded sleeve 252 is arranged between the two second hinged seats 251, and two second threaded grooves 253 are opened at the two ends of the second threaded sleeve 252. The second screw rod 254 is threadedly connected to the inside of the second threaded groove 253, and one end of the two second screw rods 254 away from the second threaded sleeve 252 is hinged to the two second hinged seats 251. The two second screw rods 254 at the two ends of the second threaded sleeve 252 have opposite threaded rotation directions, and the two ends of the second screw rod 254 are fixed on the hinge shaft between the two second hinged seats 251, so that the second The screw rod 254 cannot rotate with the second threaded sleeve 252. The rotation of the second screw rod 254 drives the two second screw rods 254 to move toward each other, so that the distance between the two steel arch frame bodies 21 changes, thereby changing the curvature of the two steel arch frame bodies 21, making the curvature of the steel arch frame adjustable, and realizing that the steel arch frame can fit the structural surface of the tunnel surrounding rock 10 within a certain range, avoiding the customization and uniqueness of the steel arch frame for tunnel construction, increasing the versatility of the steel arch frame in different tunnels, and reducing the budget of the tunnel project on the manufacture and construction of the steel arch frame.

[0020] Please refer to Figure 1-Figure 4The through groove 22 is opened in the middle of the two steel arch frame bodies 21, and the two first tensioning components 23 for fitting with the tunnel surrounding rock 10 are arranged inside the through groove 22. The first tensioning component 23 includes a first threaded sleeve 231, a first threaded groove 232, a first screw rod 233, and an upper flange 234. The first threaded sleeve 231 is arranged inside the steel arch frame segment 20. The two first threaded grooves 232 are opened at both ends of the first threaded sleeve 231. The first screw rod 233 is threadedly connected to the inside of the first threaded groove 232, and the first screw rod 233 at the bottom of the first threaded sleeve 231 is fixedly connected to the steel arch frame body 21. The two first screw rods 233 at both ends of the first threaded sleeve 231 have opposite threaded rotation directions, and the upper flange 234 is fixedly arranged on the top of the other first screw rod 233. The upper flange 234 is in contact with and connected to the tunnel surrounding rock 10. The upper flange 234 is arranged inside the through groove 22. The square through groove 22 blocks the upper flange 234, so that the upper flange 234 and the first screw rod 233 at the top will not rotate with the first threaded sleeve 231. The rotation of the first threaded sleeve 231 drives the two first screw rods 233 to move toward each other, changing the distance from the upper flange 234 to the inner wall of the bottom of the through groove 22, so that the upper flange 234 can rise to be close to the inner wall of the tunnel surrounding rock 10, realizing fine adjustment of the steel arch frame at a certain position, and can better fit closely with the tunnel surrounding rock 10 when the tunnel surrounding rock 10 undergoes unbalanced deformation, so that the steel arch frame is stressed as a whole, exerting the maximum effectiveness of the steel arch frame, better realizing the protection effect, and reducing the occurrence of deformation of the tunnel surrounding rock 10.

[0021] This application can explain its functional principle through the following operation methods:

[0022] When in use, the mounting plates 30 at both ends of the plurality of steel arch frame segments 20 are connected and connected, the bolt holes 40 on the mounting plates 30 are aligned, and the fastening bolts are screwed into the bolt holes 40 to fix two adjacent steel arch frame bodies 21 together. When the bending degrees of the plurality of steel arch frame segments 20 on the inner wall of the tunnel surrounding rock 10 do not match, the second threaded sleeve 252 at the bottom of the steel arch frame body 21 is rotated so that the two second screw rods 254 threadedly connected to the two ends of the second threaded sleeve 252 move toward each other, and the distance between the two second hinged seats 251 is adjusted so that the angles of the two steel arch frame bodies 21 hinged by the first hinged seats 24 change, so that the curvature of the steel arch frame is adjustable, so that the steel arch frame can fit the structural surface of the tunnel surrounding rock 10 within a certain range, avoiding the steel The customization and uniqueness of the arch frame for tunnel construction increase the versatility of the steel arch frame in different tunnels and reduce the budget for the manufacture and construction of the steel arch frame in tunnel projects. The two first threaded sleeves 231 inside the rotating through groove 22 drive the two first screw rods 233 threadedly connected to them at both ends to move toward each other in the first threaded groove 232, so that the upper flange 234 at the top moves upward to a position that fits with the inner wall of the tunnel surrounding rock 10, thereby achieving fine-tuning of the steel arch frame at a certain position. When the tunnel surrounding rock 10 undergoes unbalanced deformation, it can better fit closely with the tunnel surrounding rock 10, so that the steel arch frame is stressed as a whole, and the maximum effectiveness of the steel arch frame is exerted, so as to better achieve the protection effect and reduce the deformation of the tunnel surrounding rock 10.

[0023] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

[0024] What has been described above is only a preferred specific implementation manner of the embodiments of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical scheme and concept of the present application within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. A tensioned steel arch support structure for tunnel surrounding rock protection, comprising a plurality of steel arch segments (20) inside the tunnel surrounding rock (10), characterized in that: Both ends of the plurality of steel arch segments (20) are provided with mounting plates (30), and the plurality of steel arch segments (20) include: Two steel arch frames (21) are fixedly connected to the two mounting plates (30) respectively; A first hinge seat (24) is arranged between the two steel arch frame bodies (21), and the two steel arch frame bodies (21) are hingedly connected via the first hinge seat (24); The second tensioning assembly (25) is arranged at the bottom of the two steel arch frame bodies (21), and the second tensioning assembly (25) is used to change the angle of the two steel arch frame bodies (21).

2. A tensioned steel arch support structure for tunnel surrounding rock protection as claimed in claim 1, characterized in that: A through slot (22) is provided in the middle of the two steel arch bodies (21), and two first tensioning components (23) for fitting with the tunnel surrounding rock (10) are arranged inside the through slot (22).

3. A tensioned steel arch support structure for tunnel surrounding rock protection as claimed in claim 2, characterized in that: The first tensioning assembly (23) comprises: A first threaded sleeve (231) is arranged inside the steel arch segment (20); Two first thread grooves (232) are formed at two ends of the first thread sleeve (231); A first screw rod (233) is threadedly connected to the inside of the first thread groove (232), and the first screw rod (233) at the bottom of the first thread sleeve (231) is fixedly connected to the steel arch frame body (21); An upper flange (234) is fixedly arranged on the top of another of the first screw rods (233), and the upper flange (234) is in contact with and connected to the tunnel surrounding rock (10).

4. A tensioned steel arch support structure for tunnel surrounding rock protection as claimed in claim 1, characterized in that: The second tensioning assembly (25) comprises: Two pairs of second hinged seats (251) are symmetrically arranged at the bottom of the middle parts of the two steel arch frames (21); A second threaded sleeve (252) is arranged between the two second hinge seats (251); Two second thread grooves (253) are formed at two ends of the second thread sleeve (252); The second screw rod (254) is threadedly connected to the inside of the second thread groove (253), and one end of the two second screw rods (254) away from the second thread sleeve (252) is hinged to the two second hinge seats (251).

5. A tensioned steel arch support structure for tunnel surrounding rock protection as claimed in claim 1, characterized in that: Bolt holes (40) are provided on both sides of the mounting plate (30), and fastening bolts are provided inside the two bolt holes (40).

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