A composite support device for tunnel micro-step construction

Abstract

The present invention discloses a composite support device for tunnel micro-step construction, which includes a plurality of pipe-support pipes, a plurality of fixing frames and a plurality of steel arch frames, wherein the pipe-support pipes are evenly arranged in a semi-circular shape and inserted into the mountain rock; the fixing frame is a semi-ring body, which is arranged at a certain distance along the length direction of the pipe-support pipe and sleeved on the pipe-support pipe; the steel arch frame is segmentedly connected into a semi-ring body, which is arranged at a certain distance along the length direction of the pipe-support pipe and docked with the fixing frame at the corresponding position, and on the same horizontal plane perpendicular to the pipe-support pipe, the steel arch frame and the fixing frame are fixedly connected to form a closed complete torus body. The present invention provides support force for the rock above it, so that the rock is not subjected to tension, and has a fixing effect on the rock, so that when the step method is used for construction, the rock above the upper step is supported, and it is safer when the lower step construction is carried out, so as to achieve the effect of safe construction.

Description

Technical Field

[0001] The invention relates to the technical field of construction composite support, and in particular to a tunnel micro-step construction composite support device. Background Art

[0002] In pit exploration projects, composite support is a support method that uses shotcrete support and any one or more of the single support methods such as anchor support, grouting, steel mesh, steel arch frame, pipe shed, etc. at the same time and in coordination to improve the safety of excavation construction.

[0003] Chinese patent CN202360108U discloses a simple, convenient, safe and reliable composite support structure, including multiple anchor rods extending into the rock, characterized in that: the exposed parts of these anchor rods are respectively welded to the first layer of steel mesh and multiple second layer steel arch ribs, the first layer of steel mesh is tightly fitted to the rock surface, and the second layer of steel arch ribs are respectively welded to the outside of the first layer of steel mesh; in addition, the second layer of steel arch ribs and the first layer of steel mesh are covered with sprayed concrete.

[0004] The anchor device in the technical solution has the following deficiencies: the anchor is obliquely inserted into the upper rock layer, and multiple layers of steel mesh are welded at the bottom of the anchor, which causes the upper rock layer to be subjected to excessive tension, which is prone to cause accidents. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a composite support device for tunnel micro-step construction.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A composite support device for tunnel micro-step construction, comprising a plurality of pipe-supporting pipes, a plurality of fixing frames and a plurality of steel arch frames, wherein the pipe-supporting pipes are evenly arranged in a semi-circular shape and inserted into mountain rocks; the fixing frames are semi-circular bodies, which are arranged at regular intervals along the length direction of the pipe-supporting pipes and sleeved on the pipe-supporting pipes; the steel arch frames are segmentedly connected into semi-circular bodies, which are arranged at regular intervals along the length direction of the pipe-supporting pipes and docked with the fixing frames at corresponding positions, and on the same horizontal plane perpendicular to the pipe-supporting pipes, the steel arch frames and the fixing frames are fixedly connected to form a closed complete circular body.

[0008] Furthermore, on the same horizontal plane perpendicular to the pipe rack pipe, the two end heads of the fixing frame are respectively fixed to a section of steel arch frame; the two end heads of each section of the steel arch frame are fixed with connecting plates, and the outer edge of each connecting plate is provided with connecting holes. The connecting plates of two adjacent sections of steel arch frames are fitted together, and the two adjacent sections of steel arch frames are connected by connecting bolts passing through the connecting holes.

[0009] Furthermore, along the length direction of the pipe-roof pipe, a steel mesh is fixedly connected between two adjacent front and rear sections of the steel arch frame, and a concrete support layer is laid on the steel mesh.

[0010] Furthermore, a plurality of grouting rods are fixedly connected to the outer side wall of the steel arch frame, a hollow grouting groove is arranged in the grouting rod, and the grouting rod is inserted into the rock mass.

[0011] Furthermore, a fixing hole is provided on the outer wall of the steel arch frame, a thread is provided in the fixing hole, a locking foot anchor rod is inserted, a thread groove is provided on the circumferential outer wall of the locking foot anchor rod, the locking foot anchor rod is connected to a locking foot nut through a thread, and a fixing rod is fixed between two adjacent locking foot anchor rods.

[0012] Furthermore, a plurality of anchor rods are fixedly connected to the outer side wall of the steel arch frame, and the anchor rods are inserted into the rock mass.

[0013] Furthermore, the outer side wall of the connecting plate is provided with a welding groove.

[0014] Furthermore, the fixing method is welding.

[0015] The beneficial effects of the present invention are:

[0016] 1. Multiple pipe racks are evenly distributed in a semi-circular shape and fixed by a fixed frame, and a steel arch frame is arranged at the bottom, so that the rock above the steel arch frame is not subjected to tension and has a fixing effect on the rock. The steel arch frame can provide support for the upper rock, so that when the step method is used for construction, it can support the upper rock of the upper step, making it safer when constructing the lower step, thereby achieving a safe construction effect.

[0017] 2. By setting up steel mesh, anchor rods and concrete support layers, the steel arch frame can be better fixed in the rock, which has a stabilizing effect on the rock and a certain waterproof effect, thus achieving a safer and more waterproof effect.

[0018] 3. By setting connection holes on the outer wall of the connecting plate, the two sections of the steel arch frame can be fixedly connected, and the two sections of the steel arch frame can be further fixed by welding grooves. The locking anchor rod can eliminate the gap between the steel arch frame and the rock mass, and the fixing rod can prevent the locking nut from falling off, thereby achieving a better effect of fixing and connecting the steel arch frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the main structure of the device of the present invention;

[0020] Figure 2 It is a schematic diagram of the top view of the structure of the device of the present invention;

[0021] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of B;

[0022] Figure 4 for Figure 2 Schematic diagram of the enlarged structure of A.

[0023] In the figure: 1-fixing frame; 2-pipe rack pipe; 3-grouting rod; 4-steel arch frame; 5-anchor rod; 6-connecting plate; 7-steel mesh; 8-concrete support layer; 9-grouting groove; 10-locking anchor rod; 11-threaded groove; 12-locking nut; 13-fixing rod; 14-connecting bolt; 15-connecting hole; 16-welding groove. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] like Figures 1 to 4 As shown, a composite support device for tunnel micro-step construction includes a plurality of pipe-support pipes 2, a plurality of fixing frames 1 and a plurality of steel arch frames 4. The pipe-support pipes 2 are evenly arranged in a semi-circular shape and inserted into the mountain rock; the fixing frame 1 is a semi-circular body, which is arranged at a certain distance along the length direction of the pipe-support pipe 2 and sleeved on the pipe-support pipe 2; the steel arch frame 4 is segmented and connected into a semi-circular body, which is arranged at a certain distance along the length direction of the pipe-support pipe 2 and docked with the fixing frame 1 at the corresponding position. On the same horizontal plane perpendicular to the pipe-support pipe 2, the steel arch frame 4 and the fixing frame 1 are welded to form a closed complete circular ring. By arranging a plurality of pipe-support pipes 2 evenly arranged in a semi-circular shape and fixed by the fixing frame 1, and arranging the steel arch frame 4 below, the rock above is not subjected to tension and has a fixing effect on the rock. The steel arch frame 4 can provide support for the rock above, so that when the step method is used for construction, the rock above the upper step is supported, and the construction of the lower step is safer, thereby achieving the effect of safe construction.

[0026] In order to further solve the security issues; Figure 1 and Figure 4 As shown, on the same horizontal plane perpendicular to the pipe rack pipe 2, the two ends of the fixing frame 1 are respectively welded to a section of steel arch frame 4; both ends of the steel arch frame 4 are welded with connecting plates 6, and the outer edge of each connecting plate 6 is provided with connecting holes 15, the connecting plates 6 of adjacent sections of steel arch frames 4 are fitted together, and the two adjacent sections of steel arch frames 4 are connected by connecting bolts 14 passing through the connecting holes 15; the outer wall of the connecting plate 6 is provided with a welding groove 16; by providing the connecting hole 15 on the outer wall of the connecting plate 6, the two steel arch frames 4 can be fixedly connected, and the two steel arch frames 4 can be further fixed by the welding groove 16.

[0027] Along the length direction of the pipe-roof pipe 2, a steel mesh 7 is fixedly connected between the corresponding front and rear adjacent sections of the steel arch frame 4; a concrete support layer 8 is laid on the steel mesh 7; a plurality of grouting rods 3 are welded to the outer wall of the steel arch frame 4, and the grouting rods 3 are provided with a hollow grouting groove 9, and the grouting rods 3 are inserted into the rock body; a fixing hole is opened on the outer wall of the steel arch frame 4, and a thread is provided in the fixing hole, and a locking foot anchor rod 10 is inserted, and the circumferential outer wall of the locking foot anchor rod 10 is provided with a thread groove 11, and the locking foot anchor rod 10 is threadedly connected with a locking foot nut 12, and a fixing rod 13 is welded between two adjacent locking foot anchor rods 10; a plurality of anchor rods 5 are welded to the outer wall of the steel arch frame 4, and the anchor rods 5 are inserted into the rock body, and the locking foot anchor rod 10 can make there is no gap between the steel arch frame 4 and the rock body, and the fixing rod 13 can prevent the locking foot nut 12 from falling off, thereby achieving a better effect of fixing and connecting the steel arch frame 4.

[0028] The working principle of the present invention is as follows: when in use, first drill a hole in the rock above the upper step, insert the pipe-roof pipe 2 into the rock hole, and fix the fixing frame 1 to the pipe-roof pipe 2, then weld the fixing frame 1 to the steel arch frame 4, fix the steel arch frame 4 to the outer wall of the rock through the anchor rod 5, and connect the steel arch frame 4 through the connecting plate 6, and weld through the welding groove 16, and then weld the steel mesh 7 between the adjacent steel arch frames 4 along the length direction of the pipe-roof pipe 2, and fill the space between the steel mesh 7 and the steel arch frame 4 by spraying concrete to form a concrete support layer 8, and perform grouting operation into the grouting rod 3 through the grouting groove 9, and by rotating the locking nut 12, there is no gap between the steel arch frame 4 and the rock, and weld the fixing rod 13 to the circumferential outer wall of the locking anchor rod 10 for fixing. After the fixing is completed, the construction work of the lower step can be carried out.

[0029] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A composite support device for tunnel micro-step construction, Features: It includes a plurality of pipe-roofing pipes, a plurality of fixing frames and a plurality of steel arch frames. The pipe-roofing pipes are evenly arranged in a semi-circular shape and inserted into the mountain rock; the fixing frame is a semi-ring body, which is arranged at a certain distance along the length direction of the pipe-roofing pipe and sleeved on the pipe-roofing pipe; the steel arch frame is segmented and connected into a semi-ring body, which is arranged at a certain distance along the length direction of the pipe-roofing pipe and docked with the fixing frame at the corresponding position, and on the same horizontal plane perpendicular to the pipe-roofing pipe, the steel arch frame and the fixing frame are fixedly connected to form a closed complete circular ring body; on the same horizontal plane perpendicular to the pipe-roofing pipe, the two ends of the fixing frame are respectively fixedly connected to a section of the steel arch frame; the two ends of each section of the steel arch frame are fixedly connected with a connecting plate, and the outer edge of each connecting plate is provided with a connecting hole, the connecting plates of two adjacent sections of the steel arch frame fit together, and the two adjacent sections of the steel arch frame are connected by connecting bolts passing through the connecting holes.

2. The composite support device for tunnel micro-step construction according to claim 1, Features: Along the length direction of the pipe-roof pipe, a steel mesh is fixedly connected between two adjacent front and rear sections of the steel arch frame, and a concrete support layer is laid on the steel mesh.

3. The composite support device for tunnel micro-step construction according to claim 1, Features: A plurality of grouting rods are fixedly connected to the outer side wall of the steel arch frame, wherein hollow grouting grooves are arranged in the grouting rods, and the grouting rods are inserted into the rock mass.

4. The composite support device for tunnel micro-step construction according to claim 1, Features: The outer wall of the steel arch frame is provided with a fixing hole, a thread is provided in the fixing hole, a locking foot anchor rod is inserted, a thread groove is provided on the circumferential outer wall of the locking foot anchor rod, the locking foot anchor rod is connected to a locking foot nut through a thread, and a fixing rod is fixed between two adjacent locking foot anchor rods.

5. The composite support device for tunnel micro-step construction according to claim 1, Features: The outer side wall of the steel arch frame is fixedly connected with a plurality of anchor rods, and the anchor rods are inserted into the rock mass.

6. The composite support device for tunnel micro-step construction according to claim 1, Features: The outer side wall of the connecting plate is provided with a welding groove.

7. The composite support device for tunnel micro-step construction according to any one of claims 1 to 5, Features: The fixing is welding.

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