Tunnel composite lining grating steel frame structure

Abstract

The utility model discloses a tunnel combined type lining grating steel frame structure which comprises a plurality of first sections and two second sections, the arc-shaped first sections are sequentially connected end to end through first connectors to form an arch structure, and the two second sections are symmetrically arranged. The upper ends of the second sections are connected with the two ends of the arch structure through first connectors, and the lower ends of the two second sections are connected with second connectors. Wherein the central angle opposite to the first section is 30 degrees; the second section is composed of an arc-shaped section and a linear section, the upper end of the arc-shaped section is connected with the first connector, and the lower end of the arc-shaped section is connected with the second connector through the linear section. The construction mode that field assembly is carried out after prefabrication is adopted, the field 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 protection, in particular to a tunnel composite lining grid steel frame 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 composite lining grid steel frame structure, which adopts a prefabricated assembled structure for current assembly, can effectively reduce the difficulty of on-site construction and improve construction efficiency.

[0005] A tunnel composite lining grid steel frame structure includes a plurality of first segments and two second segments, wherein the plurality of arc-shaped first segments are sequentially connected end to end via a first joint to form an arch structure, and the two second segments are symmetrically arranged, wherein the upper ends of the second segments are connected to the two ends of the arch structure via the first joint, and the lower ends of the two second segments are connected to the second joint;

[0006] Wherein, the central angle subtended by the first segment is 30°;

[0007] 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 first joint, and the lower end of the arc segment is connected to the second joint 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 pipe is connected to the first joint and the second joint between the first segment and the second segment.

[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] Furthermore, the first segment and the second segment each include four longitudinal steel bars, reinforcing ribs are arranged inside the four longitudinal steel bars, and the four longitudinal steel bars are connected by the reinforcing ribs to form a rectangular structure, and a clamp is provided outside the four longitudinal steel bars, and a first support member and a second support member are provided at both ends of the longitudinal steel bars, wherein the first support member is located on the inner side of the second support member.

[0014] Furthermore, the reinforcing ribs are formed by connecting two steel grids with the same structure and in an 8-shape.

[0015] Furthermore, the two steel gratings are arranged back to back, and a bulge is formed in the middle of the steel grating, and the two steel gratings are welded and fixed at the bulge.

[0016] Beneficial effects:

[0017] 1. By using a method of prefabricated multiple first segments and two second segments to assemble on-site into a steel frame structure, the difficulty of on-site construction is effectively reduced and the construction efficiency is improved.

[0018] 2. The arched steel frame structure formed by multiple first segments and two second segments has good structural rigidity and bearing capacity, thereby helping to improve the structural stability of the tunnel lining. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] Figure 2 It is a structural diagram of the second section;

[0021] Figure 3 This is the installation elevation view of the utility model;

[0022] Figure 4 for Figure 3 AA section view;

[0023] Figure 5 for Figure 3 BB cross-sectional view;

[0024] Figure 6 It is a structural diagram of the reinforcement;

[0025] Figure 7 Top view of the reinforcement rib. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0027] like Figure 1-Figure 7As shown, a tunnel composite lining grid steel frame structure 10 includes five first segments 1 and two second segments 2. The five arc-shaped first segments 1 are connected end to end in sequence through first joints 3 to form an arch structure. The centerline of the middle first segment 1 is collinear with the tunnel centerline. The two second segments 2 are symmetrically arranged. The upper ends of the second segments 2 are connected to the two ends of the arch structure through the first joints 3, and the lower ends of the two second segments 2 are connected to the second joints 4. Specifically, the arch structure formed by the end-to-end connection of the first segments 1 through the first joints 3 is the vault part of the steel frame system 10, and the second segments 2 form the side wall part of the steel frame system 10.

[0028] 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°.

[0029] Preferably, the first joint 3 and the second joint 4 are both welded and fixed to the ends of the first segment 1 and the second segment 2 by angle steels, and bolt holes are provided on the angle steels.

[0030] from Figure 1 It can also be seen that at least one locking foot anchor pipe 5 is connected to the first joint 3 and the second joint 4 between the first segment 1 and the second segment 2. By providing the locking foot anchor pipe 5 at both the arch foot and the wall foot, the structural stability of the steel frame structure can be effectively improved.

[0031] 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°.

[0032] In this example, the length of the locking foot anchor pipe 5 is 5 meters to ensure sufficient pull-out resistance.

[0033] like Figure 2 As shown, the second segment 2 is formed by connecting an arc segment 21 and a straight segment 22, and the length ratio 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 first joint 3, and the lower end of the arc segment 21 is connected to the second joint 4 through the straight segment 22.

[0034] Preferably, the central angle β subtended by the arc segment 21 is smaller than the central angle α subtended by the first segment 1 .

[0035] 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.

[0036] In this example, the structures of the first segment 1 and the second segment 2 are the same, for details, see the attached Figure 4 and attached Figure 5 , each includes four longitudinal steel bars a, reinforcing bars b are arranged inside the four longitudinal steel bars a, and the four longitudinal steel bars a are connected by the reinforcing bars b to form a rectangular structure, a hoop g is provided on the outer surface of the four longitudinal steel bars a, and a first support member c and a second support member d are provided at both ends of the longitudinal steel bars a, wherein the first support member c is located on the inner side of the second support member d, the first support member c is annular, and the second support member d is U-shaped.

[0037] The above structure is not only simple in structure and convenient for processing the first segment 1 and the second segment 2 , but also has sufficient structural strength, so that the prefabricated steel frame structure 10 has sufficient structural stability.

[0038] like Figure 6 and Figure 7 As shown, the reinforcing ribs b are formed by connecting two 8-shaped steel gratings e with the same structure. Specifically, the two steel gratings e are arranged back to back, and a protrusion f is formed in the middle of the steel gratings e. The two steel gratings e are fixed by welding through the protrusion f.

[0039] The reinforcing ribs b of the above structure can effectively ensure the supporting strength of the four longitudinal steel bars a, thereby making the prefabricated steel frame structure 10 have sufficient structural stability.

[0040] Working principle:

[0041] The steel frame structure 10 described in this example is composed of units such as a first segment 1, a second segment 2, a first joint 3, a second joint 4, and a locking foot anchor pipe 5. The unit lengths and joint positions can be adjusted according to actual conditions.

[0042] After the units in the steel frame structure 10 are prefabricated outside the tunnel, they are assembled at the tunnel construction site and connected by bolts at the first joint 3 and the second joint 4;

[0043] During installation, if Figure 3As 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] 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 composite lining grid steel frame structure, characterized in that: The invention comprises a plurality of first segments (1) and two second segments (2), wherein the plurality of arc-shaped first segments (1) are sequentially connected end to end via a first joint (3) to form an arch structure, and the two second segments (2) are symmetrically arranged, wherein the upper ends of the second segments (2) are connected to the two ends of the arch structure via the first joint (3), and the lower ends of the two second segments (2) are connected to a second joint (4); wherein the central angle subtended by the first segment (1) is 30°; 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 first joint (3), and the lower end of the arc segment (21) is connected to the second joint (4) through the straight segment (22).

2. The tunnel composite lining grid steel frame structure according to claim 1, characterized in that: The central angle subtended by the arc segment (21) is smaller than the central angle subtended by the first segment (1).

3. The tunnel composite lining grid steel frame structure according to claim 2, characterized in that: The ratio of the lengths of the arc segment (21) and the straight segment (22) is 1:1.

8.

4. The tunnel composite lining grid steel frame structure according to claim 1, characterized in that: At least one locking foot anchor pipe (5) is connected to the first joint (3) and the second joint (4) between the first segment (1) and the second segment (2).

5. The tunnel composite lining grid steel frame structure according to claim 4, characterized in that: 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.

6. The tunnel composite lining grid steel frame structure according to claim 5, characterized in that: The length of the locking foot anchor pipe (5) is 5 meters.

7. The tunnel composite lining grid steel frame structure according to any one of claims 1 to 6, characterized in that: The first segment (1) and the second segment (2) each include four longitudinal steel bars (a), reinforcement bars (b) are provided inside the four longitudinal steel bars (a), and the four longitudinal steel bars (a) are connected by the reinforcement bars (b) to form a rectangular structure, a clamp (g) is provided outside the four longitudinal steel bars (a), and a first support member (c) and a second support member (d) are provided at both ends of the longitudinal steel bars (a), wherein the first support member (c) is located on the inner side of the second support member (d).

8. The tunnel composite lining grid steel frame structure according to claim 7, characterized in that: The reinforcing rib (b) is formed by connecting two steel grids (e) with the same structure and in the shape of an 8.

9. The tunnel composite lining grid steel frame structure according to claim 8, characterized in that: The two steel gratings (e) are arranged in back-to-back relation, and a bulge (f) is formed in the middle of the steel grating (e). The two steel gratings (e) are welded and fixed at the bulge (f).

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