Tunnel lining steel frame system based on fabricated structure

Abstract

The utility model discloses a tunnel lining steel frame system based on an assembled structure, which comprises a plurality of first sections, a plurality of second sections, a plurality of third sections, a plurality of fourth sections and a plurality of fifth sections, the two ends of the arch-shaped structure are connected with the upper ends of two second sections which are symmetrically arranged through connecting pieces, the inner side walls of the lower ends of the two second sections are each fixedly connected with a third section, the inner ends of the third sections are connected with fourth sections through connecting pieces, and the fifth section is arranged between the fourth sections on the two sides; the two ends of the fifth section are connected with the inner ends of the fourth sections on the two sides through connecting pieces. And a construction mode of on-site assembly after prefabrication is adopted, so that the on-site construction difficulty is effectively reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel support and protection, in particular to a tunnel lining steel frame system based on an assembled structure. Background Art

[0002] Tunnel linings are permanent structures that support and maintain the long-term stability and durability of tunnels. Their functions include: supporting and maintaining tunnel stability; maintaining the required clearance for trains; preventing weathering of the surrounding rock; and mitigating the effects of groundwater. Therefore, tunnel linings must possess sufficient strength, durability, and adequate resistance to freezing, seepage, and erosion.

[0003] Under publicly available technical conditions, tunnel lining steel frame structures are generally constructed by on-site binding and / or welding, which undoubtedly increases the difficulty of on-site construction, makes it difficult to ensure quality, and reduces construction efficiency. Utility Model Content

[0004] The utility model provides a tunnel lining steel frame system based on an assembled structure, which adopts a prefabricated assembled structure for current assembly, and can effectively reduce the difficulty of on-site construction and improve construction efficiency.

[0005] A tunnel lining steel frame system based on an assembled structure includes a first segment, a second segment, a third segment, a fourth segment and a fifth segment. A plurality of arc-shaped first segments are connected end to end in sequence via connectors to form an arch structure. The two ends of the arch structure are connected to the upper ends of two symmetrically arranged second segments via connectors. A third segment is respectively connected and fixed to the inner side walls of the lower ends of the two second segments. The fourth segment is connected to the inner end of the third segment via a connector. The fifth segment is arranged between the fourth segments on both sides. The two ends of the fifth segment are connected to the inner ends of the fourth segments on both sides via connectors.

[0006] Furthermore, the central angle subtended by the first segment is 30°.

[0007] Furthermore, the second segment is composed of an arc segment and a straight segment, wherein the upper end of the arc segment is connected to the connecting piece, and the lower end of the arc segment is connected to the third segment through the straight segment.

[0008] Furthermore, the central angle subtended by the arc segment is smaller than the central angle subtended by the first segment.

[0009] Furthermore, the ratio of the length of the arc segment to the length of the straight segment is 1:1.8.

[0010] Furthermore, at least one locking foot anchor tube is connected to the upper and lower ends of the first segment and the lower end of the second segment at the bottom.

[0011] Furthermore, there are two locking foot anchor tubes, and the angle between the two locking foot anchor tubes is equal to the angle between the upper locking foot anchor tube and the horizontal direction.

[0012] Furthermore, the length of the locking foot anchor pipe is 5 meters.

[0013] Beneficial effects:

[0014] 1. By using the prefabricated first segment, second segment, third segment, fourth segment and fifth segment to assemble the steel frame structure on site, the difficulty of on-site construction is effectively reduced and the construction efficiency is improved.

[0015] 2. After being assembled, the first, second, third, fourth and fifth segments form a ring structure that can be circumferentially supported on the circumference of the tunnel. Therefore, it has good structural stiffness and bearing capacity, thereby helping to improve the structural stability of the tunnel lining. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 It is a structural diagram of the first section;

[0018] Figure 3 It is a structural diagram of the second section;

[0019] Figure 4 It is the structural diagram of the third section;

[0020] Figure 5 It is the structural diagram of the fourth section;

[0021] Figure 6 This is a structural diagram of the fifth segment;

[0022] Figure 7 This is the installation elevation view of the utility model. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0024] like Figure 1-Figure 7As shown, a tunnel lining steel frame system 10 based on an assembled structure includes a first segment 1, a second segment 2, a third segment 3, a fourth segment 4 and a fifth segment 5. A plurality of arc-shaped first segments 1 are connected end to end in sequence through connectors 6 to form an arch structure. The two ends of the arch structure are connected to the upper ends of two symmetrically arranged second segments 2 through connectors 6. A third segment 3 is respectively connected and fixed to the inner side walls of the lower ends of the two second segments 2. The inner end of the third segment 3 is connected to the fourth segment 4 through connectors 6. The fifth segment 5 is arranged between the fourth segments 4 on both sides. The two ends of the fifth segment 5 are connected to the inner ends of the fourth segments 4 on both sides through connectors 6.

[0025] Specifically, the first segments 1 are connected end to end via connectors 6 to form an arched structure, which is the vault portion of the steel frame system 10. The second segment 2 forms the side wall portion of the steel frame system 10. The third segment 3, the fourth segment 4, and the fifth segment 5 are connected to form the inverted arch portion of the steel frame system 10.

[0026] In this embodiment, the central angle α of the first segment 1 is 30°; that is, the central angle of the arch structure formed by the five arc-shaped first segments 1 connected end to end is 150°.

[0027] Preferably, the connecting member 6 is a steel plate welded and fixed to the ends of the first segment 1, the second segment 2, the third segment 3, the fourth segment 4 and the fifth segment 5, and screw holes are opened on the steel plate. When two adjacent stages are connected, bolts are inserted into the screw holes.

[0028] from Figure 1 It can also be seen that two locking foot anchor pipes 7 are connected to the upper and lower ends of the first segment 1 and the lower end of the second segment 2. By providing locking foot anchor pipes 5 at three locations, the lower part of the arch structure and the wall foot, the structural stability of the steel frame structure can be effectively improved.

[0029] In this example, there are two locking foot anchor tubes 5, and the angle between the two locking foot anchor tubes 5 is equal to the angle between the upper locking foot anchor tube 5 and the horizontal direction, that is, Figure 1 The medium γ angle can further reduce the difficulty of on-site construction and improve construction efficiency. In the specific construction process, γ is 20°.

[0030] In this example, the length of the locking foot anchor pipe 5 is 5 meters to ensure sufficient pull-out resistance.

[0031] like Figure 2As shown, the first segment 1 is made of arc-shaped steel, and a steel plate is welded at both ends of the first segment 1 to form a part of the connecting member 6. Screw holes are opened on the steel plates, and when it is necessary to connect with other first segments 1 or second segments 2, it is achieved by inserting bolts into the screw holes.

[0032] like Figure 3 As shown, the second segment 2 is formed by connecting an arc segment 21 and a straight segment 22, and the ratio of the length of the arc segment 21 to the straight segment 22 is 1:1.8, wherein the upper end of the arc segment 21 is connected to the connecting piece 6, and the lower end of the arc segment 21 is connected to the third segment 3 through the straight segment 22. Steel plates are welded and fixed at the upper end of the arc segment 21 and the lower end of the straight segment 22 to form a part of the connecting piece 6. Screw holes are opened on the steel plates, and when it is necessary to connect with the first segment 1, bolts are inserted into the screw holes to achieve this.

[0033] Preferably, the central angle β subtended by the arc segment 21 is smaller than the central angle α subtended by the first segment 1 .

[0034] Such a design can not only better distinguish the first section 1 from the second stage 2, but also further reduce the difficulty of on-site construction and improve construction efficiency.

[0035] See attached Figure 3 The third segment 3 is arranged horizontally and is made of straight steel. The two third segments 3 are respectively connected and fixed to the inner walls of the two second segments 2 on the left and right sides. The outer end surface of the third segment 3 is adapted to the inner wall surface of the second stage 2. A steel plate is welded and fixed at the inner end of the third segment 3 to form a part of the connecting member 6. Screw holes are opened on the steel plate. When it needs to be connected with the fourth segment 4, it is achieved by inserting bolts in the screw holes.

[0036] During the specific implementation process, the second stage 2 and the third segment 3 can be integrally formed or welded and fixed in advance to avoid welding at the construction site.

[0037] See attached Figure 5 The fourth segment 4 is connected by a horizontal segment 41 and an inclined segment 42, wherein the horizontal segment 41 is horizontally arranged and collinear with the center line of the third segment 3, and the inclined segment 42 is inclined and arc-shaped. The outer end of the horizontal segment 41 and the inner end of the inclined segment 42 are welded and fixed with steel plates to form a part of the connecting member 6. Screw holes are opened on the steel plates, and when it is necessary to connect with the third segment 3 and the fifth segment 5, it is achieved by inserting bolts in the screw holes.

[0038] In the specific implementation process, the horizontal section 41 and the inclined section 42 can be directly formed by bending steel sections to reduce the production difficulty.

[0039] See attached Figure 6The fifth segment 5 is made of arc-shaped steel, and steel plates are welded and fixed at both ends of the fifth segment 5 to form a part of the connecting member 6. Screw holes are opened on the steel plates, and when it needs to be connected to the fourth segment 4, bolts are inserted into the screw holes to achieve it.

[0040] Working principle:

[0041] The steel frame structure 10 described in this example is composed of a ring structure formed by connecting a first segment 1, a second segment 2, a third segment 3, a fourth segment 4, and a fifth segment 5 via connectors 6, and structural units such as locking foot anchor pipes 7. In actual construction, the unit lengths and the positions of the connectors 6 can be adjusted according to actual conditions.

[0042] Each unit in the steel frame structure 10 is prefabricated outside the tunnel and then assembled at the tunnel construction site. The connection between each unit is connected by steel plates with screw holes and bolts to form a connecting piece 6;

[0043] During installation, if Figure 7 As shown, concrete is initially sprayed on the excavated surface to form a 4cm thick primary sprayed concrete layer 20. Three positioning steel bars 30 are then installed, evenly spaced on the left and right sides. A steel frame structure 10 is erected, with close contact between the steel frame structure 10 and the primary sprayed concrete layer 20, and the gaps are wedged with concrete pads. After the steel frame structure 10 is erected, concrete is sprayed again to the designed thickness, forming a secondary sprayed concrete layer 40. After allowing for a certain amount of deformation, a waterproof board + geotextile layer 60 is installed, and a secondary lining 70 is constructed. Finally, the gap 50 between the secondary sprayed concrete layer 40 and the waterproof board + geotextile layer 60 is backfilled with concrete of the same grade as the secondary lining. At the same time, longitudinal connecting bars can be used to connect adjacent steel frame structures to further enhance the lining's ability to resist external pressure and reduce the risk of cracking in the lining concrete surface layer.

[0044] In summary, the steel frame structure described in this embodiment effectively reduces the difficulty of on-site construction and improves construction efficiency by adopting a method of assembling the prefabricated first segment, second segment, third segment, fourth segment and fifth segment on-site into a steel frame structure; at the same time, the first segment, second segment, third segment, fourth segment and fifth segment are assembled to form an annular structure, which can be circumferentially supported on the circumferential side of the tunnel, and therefore has good structural stiffness and bearing capacity, thereby helping to improve the structural stability of the tunnel lining.

[0045] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention. Such changes fall within the scope of protection of the present invention.

Claims

1. A tunnel lining steel frame system based on an assembled structure, characterized in that: The invention comprises a first segment (1), a second segment (2), a third segment (3), a fourth segment (4) and a fifth segment (5); a plurality of arc-shaped first segments (1) are connected end to end in sequence through a connecting piece (6) to form an arch structure; both ends of the arch structure are connected to the upper ends of two symmetrically arranged second segments (2) through a connecting piece (6); a third segment (3) is respectively connected and fixed to the inner side wall of the lower end of the two second segments (2); the inner end of the third segment (3) is connected to the fourth segment (4) through a connecting piece (6); the fifth segment (5) is arranged between the fourth segments (4) on both sides; and both ends of the fifth segment (5) are connected to the inner ends of the fourth segments (4) on both sides through a connecting piece (6).

2. The tunnel lining steel frame system based on the prefabricated structure according to claim 1 is characterized in that: The central angle subtended by the first segment (1) is 30°.

3. The tunnel lining steel frame system based on the prefabricated structure according to claim 1 is characterized in that: The second segment (2) is formed by connecting an arc segment (21) and a straight segment (22), wherein the upper end of the arc segment (21) is connected to the connecting piece (6), and the lower end of the arc segment (21) is connected to the third segment (3) through the straight segment (22).

4. The tunnel lining steel frame system based on the prefabricated structure according to claim 3 is characterized in that: The central angle subtended by the arc segment (21) is smaller than the central angle subtended by the first segment (1).

5. The tunnel lining steel frame system based on the assembled structure according to claim 3 or 4, characterized in that: The ratio of the lengths of the arc segment (21) and the straight segment (22) is 1:1.

8.

6. The tunnel lining steel frame system based on prefabricated structure according to claim 1 is characterized in that: At least one locking foot anchor pipe (7) is connected to the upper and lower ends of the first segment (1) at the bottom and the lower end of the second segment (2).

7. The tunnel lining steel frame system based on the prefabricated structure according to claim 6 is characterized in that: There are two locking foot anchor tubes (7), and the angle between the two locking foot anchor tubes (7) is equal to the angle between the upper locking foot anchor tube (7) and the horizontal direction.

8. The tunnel lining steel frame system based on prefabricated structure according to claim 6 is characterized in that: The length of the locking foot anchor pipe (7) is 5 meters.

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