Pipe shed forepoling structure for small-clear-distance tunnel construction

Abstract

The utility model discloses a pipe shed advance support structure for small clear distance tunnel construction, which comprises a plurality of arc-shaped I-shaped steel frames, the adjacent I-shaped steel frames are fixedly connected through a plurality of uniformly arranged adjustable connecting frames, and the connecting frames comprise a connecting frame I and a connecting frame II. Wherein a connecting frame I and a connecting frame II are arranged on the inner side surfaces of the two I-shaped steel frames located on the outermost side respectively, a plurality of upper orifice pipes are evenly arranged on the outer side surfaces of the I-shaped steel frames, and a plurality of lower orifice pipes are evenly arranged on the inner side surfaces of the I-shaped steel frames. The I-shaped steel frames are connected through the adjustable connecting frames, the distance between the I-shaped steel frames and the total length of the supporting structure can be flexibly adjusted according to specific geological conditions, construction requirements and the like, the universality of the supporting structure is greatly improved, the construction progress can be accelerated, work delay caused by adjustment of the supporting structure is reduced, and the working efficiency is improved. And the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of road engineering, in particular to a pipe roof advance support structure for small-clearance tunnel construction. Background Art

[0002] With the rapid economic growth in Northwest my country, highway infrastructure has significantly improved. However, many existing two-lane tunnels are no longer able to meet the growing traffic demand, necessitating the design of narrow-span tunnels with varying spans. Tunneling is a critical component of this process. When constructing expressways in such terrain, the primary task is to ensure the stability of the surrounding rock during tunnel construction. Because narrow-span tunnels with varying spans exhibit more complex mechanical characteristics than tunnels with the same span, in-depth research into their construction mechanics and optimized implementation plans are crucial to ensuring smooth excavation. Due to their unique geological conditions and construction environment, narrow-span tunnels occupy a crucial position in tunnel engineering. During the construction of narrow-span tunnels, pipe-roof advance support technology is often employed to ensure surrounding rock stability and construction safety. Traditional pipe-roof advance support methods primarily rely on steel pipes pre-driven into the surrounding rock to form a support system, reinforcing the surrounding rock and preventing collapse. However, the traditional pipe-roof advance support system has some shortcomings. The fixing method between the steel frames is relatively simple and difficult to adjust, resulting in poor adaptability when facing different geological conditions, which affects construction efficiency and increases time costs. Utility Model Content

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a pipe-roof advance support structure for small-clearance tunnel construction. The spacing of the I-beam frames and the total length of the support structure can be flexibly adjusted according to specific geological conditions and construction requirements, which greatly improves its universality, helps to speed up the construction progress, and can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pipe-roof advance support structure for small-clearance tunnel construction, comprising a plurality of arc-shaped I-beam frames, adjacent to which are fixedly connected by a plurality of evenly arranged adjustable connecting frames, a plurality of upper orifice pipes evenly arranged on the outer surface of the I-beam frame, and a plurality of lower orifice pipes evenly arranged on the inner surface of the I-beam frame.

[0005] As a preferred technical solution of the present invention, the connecting frame includes a connecting frame I and a connecting frame II, wherein the inner surfaces of the two outermost I-beam frames are respectively provided with a connecting frame I and a connecting frame II, and the two side surfaces of several I-beam frames located in the middle are respectively provided with a connecting frame I and a connecting frame II, the connecting frames I and connecting frames II on adjacent I-beam frames correspond to each other, and the side surfaces of the connecting frame I and the connecting frame II are evenly provided with a plurality of fixing holes, and fixing bolts are installed in the fixing holes.

[0006] As a preferred technical solution of the present invention, a plurality of fixing frames are evenly welded between adjacent I-beam frames, and the plurality of fixing frames and the plurality of connecting frames are alternately arranged.

[0007] As a preferred technical solution of the present invention, the cross-section of the fixing frame is in an "X" shape, and the four ends of the fixing frame are respectively welded to the I-beam frames on both sides thereof.

[0008] As a preferred technical solution of the present invention, the upper orifice tubes and the lower orifice tubes are arranged alternately.

[0009] As an optimal technical solution of the present invention, a plurality of through holes are evenly opened on the web of the I-beam frame, and steel wire ropes are passed through the through holes. The upper and lower orifice tubes are respectively fixed to the upper and lower sides of the I-beam frame wing plate by steel wire ropes.

[0010] Compared with the existing technology, the beneficial effects of the present invention are: the I-beam frames are connected to each other through adjustable connecting frames, and the spacing between the I-beam frames and the total length of the support structure can be flexibly adjusted according to specific geological conditions and construction requirements, which greatly improves its universality, helps to speed up the construction progress, reduce work delays caused by support structure adjustments, and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural diagram of the utility model;

[0012] Figure 2 For this utility model Figure 1 A side structural diagram of

[0013] Figure 3 This is a schematic diagram of the structure of the utility model before the upper and lower orifice pipes are installed;

[0014] Figure 4 For this utility model Figure 3 Schematic diagram of the top view structure;

[0015] Figure 5 This is a structural diagram of another embodiment of the present invention.

[0016] In the figure: 1 I-beam frame, 2 lower hole pipe, 3 upper hole pipe, 4 fixing frame, 5 connecting frame I, 6 connecting frame II, 7 fixing hole, 8 fixing bolt, 9 through hole, 10 steel wire rope. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] See also Figure 1-4 The utility model provides a technical solution: a pipe-roof advance support structure for small-clearance tunnel construction, comprising a plurality of arc-shaped I-steel frames 1, wherein adjacent I-steel frames 1 are fixedly connected by a plurality of evenly arranged adjustable connecting frames. By adjusting the connecting frames, the spacing between the I-steel frames 1 and the total length of the support structure can be flexibly adjusted according to specific geological conditions and construction requirements, thereby greatly improving its universality, helping to speed up the construction progress, reducing work delays caused by support structure adjustments, and improving work efficiency.

[0019] A plurality of upper orifice tubes 3 are evenly arranged on the outer surface of the I-beam frame 1, and a plurality of lower orifice tubes 2 are evenly arranged on the inner surface of the I-beam frame 1. By arranging the upper and lower groups of orifice tubes 3, after the support structure is set up and concrete is poured, holes can be drilled on both sides and the pipe-roof steel pipes and steel bars can be installed, and then grouting and filling can be performed. This can greatly improve the stability of the entire support structure and ensure the stability of the surrounding rock during tunnel construction.

[0020] The preferred technical solution is that the connecting frame includes a connecting frame Ⅰ5 and a connecting frame Ⅱ6, wherein the inner surfaces of the two outermost I-beam frames 1 are respectively provided with a connecting frame Ⅰ5 and a connecting frame Ⅱ6, and the two side surfaces of the several I-beam frames 1 in the middle are respectively provided with a connecting frame Ⅰ5 and a connecting frame Ⅱ6, and the connecting frames Ⅰ5 and the connecting frames Ⅱ6 on the adjacent I-beam frames 1 correspond to each other. When the I-beam frame 1 is fixed in position, the corresponding connecting frames Ⅰ5 and the connecting frames Ⅱ6 are staggered and closely arranged, and a number of fixing holes 7 are evenly opened on the side surfaces of the connecting frames Ⅰ5 and the connecting frames Ⅱ6, and the connecting frames Ⅰ5 and Ⅱ6 are closely arranged. By installing fixing bolts 8 in the fixing holes 7 on the connecting frame Ⅱ6, the connecting frame Ⅰ5 and the connecting frame Ⅱ6 can be fixed, thereby fixing all the I-beam frames 1; there are multiple groups of fixing holes 7, and they are evenly arranged along the length direction of the connecting frame Ⅰ5 and the connecting frame Ⅱ6. By moving the I-beam frame 1, the fixing holes 7 at corresponding positions on the connecting frame Ⅰ5 and the connecting frame Ⅱ6 are aligned and the fixing bolts 8 are installed, the adjacent I-beam frames 1 can be fixed. The adjustment is convenient and the fixation is simple, and the support structure can be flexibly adjusted according to specific geological conditions and construction requirements, thereby accelerating the construction progress, improving work efficiency, and saving time and cost.

[0021] The preferred technical solution is that several fixing frames 4 are evenly welded between adjacent I-beam frames 1. The fixing frames 4 can be prefabricated steel frames of different specifications. After the I-beam frame 1 is quickly fixed by the connecting frame, the appropriate fixing frame 4 is welded and installed to the position alternately arranged with the connecting frame, so as to further strengthen the connection firmness between the I-beam frames 1, thereby improving the stability of the support structure.

[0022] A further preferred technical solution is that the cross-sectional shape of the fixing frame 4 is "X"-shaped, and the four ends of the fixing frame 4 are respectively welded to the I-beam frames 1 on both sides thereof, which not only enhances the structural strength of the fixing frame 4 itself, but also provides better stress distribution, thereby enhancing the stability of the entire support system; in addition, the "X"-shaped fixing frame 4 can also increase the contact area with the concrete, and can provide greater friction, thereby making the entire support structure more stable.

[0023] According to a preferred technical solution, the upper orifice pipe 3 and the lower orifice pipe 2 are staggered with each other, which can provide a more comprehensive support effect after the steel pipe is installed and grouting is performed.

[0024] This utility model also provides another embodiment, please refer to Figure 5: This embodiment is roughly the same as the previous embodiment, with the difference being that a number of through-holes 9 are evenly provided on the web of the I-beam frame 1, and steel wire ropes 10 are passed through the through-holes 9. The upper orifice tube 3 and the lower orifice tube 2 are respectively fixed to the upper and lower sides of the wing plate of the I-beam frame 1 by steel wire ropes 10. During the specific installation, the upper orifice tube 3 and the lower orifice tube 2 can be placed and fixed while inserting the steel wire ropes 10, or the steel wire ropes 10 can be inserted first and a length for fixing the upper orifice tube 3 and the lower orifice tube 2 can be reserved. After the upper orifice tube 3 and the lower orifice tube 2 are inserted into the openings reserved for the steel wire ropes 10, the steel wire ropes 10 are tightened in turn to fix them. The fixing of the upper orifice tube 3 and the lower orifice tube 2 is faster and more convenient, further improving the work efficiency.

[0025] The undisclosed parts of the present invention are all prior art, and their specific structures, materials and working principles will not be described in detail. Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pipe-roof advance support structure for small-clearance tunnel construction, comprising a plurality of arc-shaped I-steel frames (1), characterized in that: The adjacent I-beam frames (1) are fixedly connected by a plurality of evenly arranged adjustable connecting frames, and the outer surface of the I-beam frame (1) is evenly provided with a plurality of upper orifice tubes (3); the connecting frames include connecting frames I (5) and connecting frames II (6), wherein the inner surfaces of the two outermost I-beam frames (1) are respectively provided with connecting frames I (5) and connecting frames II (6), and the two side surfaces of the plurality of I-beam frames (1) located in the middle are respectively provided with connecting frames I (5) and connecting frames II (6), and the connecting frames I (5) and connecting frames II (6) on the adjacent I-beam frames (1) correspond to each other, and the side surfaces of the connecting frames I (5) and connecting frames II (6) are evenly provided with a plurality of fixing holes (7), and fixing bolts (8) are installed in the fixing holes (7).

2. The pipe-roof advance support structure for small-clearance tunnel construction according to claim 1, characterized in that: A plurality of lower orifice tubes (2) are evenly arranged on the inner surface of the I-beam frame (1).

3. The pipe-roof advance support structure for small-clearance tunnel construction according to claim 2, characterized in that: A plurality of fixing frames (4) are evenly welded between adjacent I-beam frames (1), and the plurality of fixing frames (4) and the plurality of connecting frames are alternately arranged.

4. The pipe-roof advance support structure for small-spacing tunnel construction according to claim 3, characterized in that: The cross-section of the fixing frame (4) is in an "X" shape, and the four ends of the fixing frame (4) are respectively welded to the I-beam frames (1) on both sides thereof.

5. The pipe-roof advance support structure for small-clearance tunnel construction according to claim 1, characterized in that: The upper orifice tubes (3) and the lower orifice tubes (2) are arranged in an interlaced manner.

6. The pipe-roof advance support structure for small-spacing tunnel construction according to claim 5, characterized in that: A plurality of through holes (9) are evenly formed on the web of the I-beam frame (1), and steel wire ropes (10) are passed through the through holes (9). The upper orifice tube (3) and the lower orifice tube (2) are fixed to the upper and lower sides of the wing plate of the I-beam frame (1) respectively through the steel wire ropes (10).

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