Double-layer advanced small conduit pre-supporting structure of shallow-buried tunnel

Abstract

The utility model relates to the technical field of tunnel grouting equipment, and discloses a shallow-buried tunnel double-layer advanced small guide pipe pre-supporting structure which comprises an arc-shaped steel frame and a small guide pipe body, a plurality of mounting holes are formed in the arc-shaped steel frame in the annular direction, the annular distance between every two adjacent mounting holes is the same, the mounting holes are formed in two layers, and the small guide pipe body is arranged in the arc-shaped steel frame. The small guide pipe body is inserted into the mounting hole and fixedly welded to the arc-shaped steel frame, a plurality of grouting holes are formed in the outer side of the small guide pipe body, and a grout stop section and a stiffening hoop are sequentially arranged at the end, away from the grouting holes, of the small guide pipe body; the small guide pipe bodies are annularly distributed on the arc-shaped steel frame in a double-layer mode, the small guide pipe bodies and the arc-shaped steel frame jointly form a pre-supporting system, construction safety is guaranteed, construction operation is simple, and the grouting effect can be well guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of tunnel grouting equipment, and in particular to a double-layer advanced small-conduit pre-support structure for shallow-buried tunnels. Background Art

[0002] Grouting is a construction method that improves the physical and mechanical properties of a building and increases its strength by filling the gaps in the building with slurry. When grouting is performed in tunnel pre-support, the use of small grouting tubes is particularly common.

[0003] However, the existing double-layer advanced small-conduct pre-support structure for shallow buried tunnels is relatively complicated to construct and operate, and has a poor supporting effect on the small-conduct, resulting in insufficient stability of the small-conduct after installation, affecting subsequent construction operations of the small-conduct.

[0004] The above information disclosed in the background technology is only used to increase the understanding of the background technology of the present application, and therefore, it may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0005] In order to solve the problem in the related art that the double-layer advance small-duct pre-support structure for shallow tunnels is complicated to construct and operate, has poor support effect on the small duct, leads to insufficient stability of the small duct after installation, and affects the subsequent construction operation of the small duct, the present application provides a double-layer advance small-duct pre-support structure for shallow tunnels.

[0006] The double-layer advanced small-pipe pre-support structure for shallow buried tunnels provided in this application adopts the following technical solutions:

[0007] A double-layer advanced small duct pre-support structure for a shallow buried tunnel comprises an arc-shaped steel frame and a small duct body, wherein the arc-shaped steel frame is provided with a plurality of mounting holes in an annular direction, the annular distance between two adjacent mounting holes is the same, and the mounting holes are provided with two layers, the small duct body is inserted into the mounting holes and fixedly welded to the arc-shaped steel frame, a plurality of grouting holes are provided on the outer side of the small duct body, and a grouting stop section and a stiffening hoop are sequentially provided at one end of the small duct body away from the grouting holes.

[0008] Preferably, the length of a single small catheter body is 4-4.5m.

[0009] Preferably, the grouting holes are arranged in a plum blossom shape, and the hole spacing is 15 cm.

[0010] Preferably, the annular distance between two adjacent mounting holes in the same annular direction is 30 cm, the slurry stopping section of the small catheter body is provided with 70 cm, and the exposed 20 cm of the small catheter body is welded to the arc-shaped steel frame.

[0011] Preferably, the arc-shaped steel frame is formed by splicing a plurality of arc-shaped steel beams through a connecting assembly, and the connecting assembly includes connecting plates installed at both ends of the plurality of arc-shaped steel beams, and connecting holes are provided on the connecting plates, and two adjacent connecting plates are fixedly connected by connecting bolts passing through the connecting holes.

[0012] In summary, this application includes the following beneficial technical effects:

[0013] 1. This application arranges the small conduit body in double layers along the arc steel frame with a circumferential spacing of 30 cm. The exposed 20 cm pipe section is welded on the arc steel frame behind the excavation surface, and together with the arc steel frame, a pre-support system is formed, thereby improving the stability of the small conduit installation and ensuring the safety of the subsequent construction of the small conduit;

[0014] 2. The present application makes the arc-shaped steel frame be formed by splicing a plurality of arc-shaped beam steels through a connecting assembly, and the connecting assembly includes a connecting plate, connecting holes and connecting bolts, so that the arc-shaped steel frame can be easily transported. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the application;

[0016] Figure 2 It is a structural schematic diagram of the arc-shaped steel frame of the application embodiment;

[0017] Figure 3 It is a schematic diagram of the structure of the small catheter body of the application embodiment.

[0018] Explanation of the reference numerals: 1. Arc-shaped steel frame; 11. Mounting hole; 2. Connection assembly; 21. Arc-shaped beam steel; 22. Connection plate; 23. Connection hole; 24. Connection bolt; 3. Small conduit body; 31. Grouting hole; 32. Grouting stop section; 33. Stiffening hoop. DETAILED DESCRIPTION

[0019] The following is combined with Figure 1-3 This application is described in further detail.

[0020] The present application embodiment discloses a double-layer advanced small conduit pre-support structure for a shallow buried tunnel. Figure 1-3 A double-layer advanced small duct pre-support structure for a shallow buried tunnel includes an arc-shaped steel frame 1 and a small duct body 3. A plurality of mounting holes 11 are opened in the annular direction of the arc-shaped steel frame 1. The annular distance between two adjacent mounting holes 11 is the same, and the mounting holes 11 are opened in two layers. The small duct body 3 is inserted into the mounting hole 11 and fixedly welded to the arc-shaped steel frame 1. A plurality of grouting holes 31 are opened on the outside of the small duct body 3, and a grouting stop section 32 and a stiffening hoop 33 are sequentially arranged at one end of the small duct body 3 away from the grouting hole 31.

[0021] Here, the arc steel frame 1 is installed at the entrance and exit section of the tunnel to be grouted, and the small conduit body 3 is inserted into the working hole pre-drilled by the rock drilling vehicle through the installation hole 11, and the small conduit body 3 is fixed and welded to the arc steel frame 1 to form a pre-support system.

[0022] Reference Figure 3 The length of a single small catheter body 3 is 4-4.5m.

[0023] Here, the small conduit body 3 is made of 42x4mm hot-rolled seamless steel pipe.

[0024] Reference Figure 3 The grouting holes 31 are arranged in a plum blossom shape, and the hole spacing is 15 cm.

[0025] The grouting quality can be ensured by arranging the grouting holes 31 in a plum blossom shape with a hole spacing of 15 cm.

[0026] Reference Figure 1 and Figure 2 The annular distance between two adjacent mounting holes 11 in the same annular direction is 30 cm, the slurry stopping section 32 of the small duct body 3 is set to 70 cm, and the small duct body 3 is exposed 20 cm and welded to the arc steel frame 1.

[0027] By exposing 20 cm of the small conduit body 3 to be welded to the arc-shaped steel frame 1, it is convenient to quickly fix and weld the small conduit body 3 to the slurry stop valve.

[0028] Reference Figure 2 The arc-shaped steel frame 1 is formed by splicing a plurality of arc-shaped steel beams 21 through a connecting assembly 2. The connecting assembly 2 includes connecting plates 22 installed at both ends of the plurality of arc-shaped steel beams 21. The connecting plates 22 are provided with connecting holes 23. Two adjacent connecting plates 22 are fixedly connected by connecting bolts 24 penetrating the connecting holes 23.

[0029] Here, the arc-shaped steel frame 1 is formed by splicing a plurality of arc-shaped steel beams 21 , and both ends of the arc-shaped steel beams 21 are provided with connecting plates 22 , connecting holes 23 and connecting bolts 24 , so that the arc-shaped steel frame 1 can be easily transported.

[0030] The implementation principle of the double-layer advanced small conduit pre-support structure for shallow buried tunnels in the embodiment of the present application is as follows: when in use, the arc-shaped steel frame 1 is assembled through the arc-shaped beam steel 21 and the connecting bolts 24 pass through the connecting holes 23 opened on the connecting plate 22, and then the assembled arc-shaped steel frame 1 is fixedly installed at the designated position, and the small conduit body 3 is inserted through the installation hole 11 into the working hole pre-drilled by the rock drilling vehicle, and the small conduit body 3 is fixedly welded to the arc-shaped steel frame 1 after reserving 20 cm to form a pre-support system. After the installation of the small conduit body 3 is completed, it is firmly welded to the grouting stop valve and grouting is carried out with a grouting pump, thereby ensuring construction safety, and the construction operation is relatively simple, which can well ensure the grouting effect.

[0031] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0032] Secondly: In the drawings of the embodiments disclosed in the present utility model, only the structures related to the embodiments disclosed in the present utility model are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present utility model can be combined with each other;

[0033] Finally: 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 in the protection scope of the present utility model.

[0034] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A double-layer advanced small-pipe pre-support structure for a shallow buried tunnel, comprising an arc-shaped steel frame (1) and a small-pipe body (3), characterized in that: The arc-shaped steel frame (1) is provided with a plurality of mounting holes (11) in an annular direction, the annular distance between two adjacent mounting holes (11) is the same, and the mounting holes (11) are provided with two layers, the small conduit body (3) is inserted into the mounting holes (11) and is fixedly welded to the arc-shaped steel frame (1), the outer side of the small conduit body (3) is provided with a plurality of grouting holes (31), and a grouting stop section (32) and a stiffening hoop (33) are sequentially provided at one end of the small conduit body (3) away from the grouting holes (31).

2. The double-layer advanced small conduit pre-support structure for shallow buried tunnels according to claim 1 is characterized by: The length of a single small catheter body (3) is 4-4.5 m.

3. The double-layer advanced small conduit pre-support structure for shallow buried tunnels according to claim 1 is characterized in that: The grouting holes (31) are arranged in a plum blossom shape, and the hole spacing is 15 cm.

4. The double-layer advanced small conduit pre-support structure for shallow buried tunnels according to claim 1 is characterized by: The annular distance between two adjacent mounting holes (11) in the same annular direction is 30 cm, the slurry stopping section (32) of the small duct body (3) is provided with 70 cm, and the exposed 20 cm of the small duct body (3) is welded to the arc-shaped steel frame (1).

5. The double-layer advanced small-pipe pre-support structure for shallow buried tunnels according to claim 1 is characterized by: The arc-shaped steel frame (1) is formed by splicing a plurality of arc-shaped steel beams (21) through a connecting assembly (2); the connecting assembly (2) comprises connecting plates (22) installed at both ends of the plurality of arc-shaped steel beams (21); the connecting plates (22) are provided with connecting holes (23); two adjacent connecting plates (22) are fixedly connected by connecting bolts (24) penetrating the connecting holes (23).

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