An advanced support structure for tunnel construction and its support technology

Abstract

This application relates to the technical field of tunnel construction, and particularly to an advanced support structure for tunnel construction and its support process. The technical solution is as follows: It includes a support assembly. The support assembly is arranged on the inner wall of the tunnel. The support assembly includes a tunnel support frame arranged on the inner wall of the tunnel, and also includes a support member arranged on the tunnel support frame. The support member includes a hydraulic support column arranged on the inner wall of the tunnel support frame, and also includes a longitudinal connecting member arranged on the top of the hydraulic support column; The support member also includes an advanced cyclic support member arranged on the inner wall of the tunnel support frame. The advanced cyclic support member includes a plurality of interconnected support modules. The plurality of support modules are used to support the inner wall of the tunnel. By enabling the interactive cyclic advancement of the plurality of support modules, this application has the technical effects of improving the stability of the free face of the surrounding rock at the heading face and reducing the risk of surrounding rock caving and collapse.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and particularly to an advanced support structure for tunnel construction and its support process. Background Art

[0002] Tunnel construction generally refers to excavating a passage in a mountain or underground. When carrying out tunnel construction, in order to avoid collapse at the top of the tunnel and cause harm to personnel, a support device is usually required for support and protection.

[0003] Now most tunnels adopt the New Austrian Tunneling Method construction process. For grade V and softer surrounding rocks, the three-step method with a core soil or the side drift method is generally used for construction, and large pipe roofs or advanced small pipe grouting are used to support the surrounding rocks at the arch top; the existing advanced support process for tunnels is complex, the technology is cumbersome, and the efficiency is low. Therefore, the present application discloses an advanced support structure for tunnel construction and its support process. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides an advanced support structure for tunnel construction and its support process.

[0005] The technical solution adopted by the present invention to solve its technical problems is:

[0006] An advanced support structure for tunnel construction, including a support assembly, the support assembly is arranged on the inner wall of the tunnel, the support assembly includes a tunnel support frame arranged on the inner wall of the tunnel, and further includes a support member arranged on the tunnel support frame, the support member includes a step arranged on the inner wall of the tunnel support frame;

[0007] The support member includes a hydraulic support column arranged on the side wall of the tunnel support frame, and further includes a longitudinal connecting member arranged on the top of the hydraulic support column;

[0008] The support member further includes an advanced cyclic support member arranged on the inner wall of the tunnel support frame, the advanced cyclic support member includes a plurality of interconnected support modules, and the plurality of support modules are used to support the inner wall of the tunnel.

[0009] Preferably, the support module includes a plurality of connecting steel structures connected end to end, the connecting steel structure includes a profiled steel and a connecting steel plate arranged on the side wall of the profiled steel, and the connecting steel plate is used to connect adjacent profiled steels.

[0010] Preferably, the profiled steel is provided with a chute for the connecting steel plate to pass through, and the end of the connecting steel plate is provided with an anti-slip hook, and the anti-slip hook passes through the chute.

[0011] Preferably, the step includes an upper step, a middle step and a lower step, and a plurality of the hydraulic support columns are arranged and are all arranged at the bottom of the longitudinal connecting member.

[0012] Preferably, the longitudinal connecting member includes a plurality of longitudinal connecting rods, and the top of the hydraulic support column is arranged at the bottom of the plurality of longitudinal connecting rods.

[0013] Preferably, the tunnel support frame includes a plurality of steel arch frames connected to the longitudinal connecting rods, and the plurality of steel arch frames are evenly distributed on the inner wall of the tunnel.

[0014] Preferably, the hydraulic support column is inclined.

[0015] Preferably, the tunnel support frame further includes a plurality of steel sheet piles penetrating into the tunnel, and the plurality of steel sheet piles are evenly arranged along the tunnel excavation contour line.

[0016] The present invention also provides a tunneling advanced support process.

[0017] Step 1: Position and orient the first pile at the topmost position 300 mm below the design contour line in the tunnel, then insert the first pile by means of hammering or hydraulic jacking, and then insert the other piles in sequence to form a circular steel curtain, and the circular steel curtain is an advanced circular support member;

[0018] Step 2: Excavate within the circular steel curtain by mechanical equipment, with a footage of 500 - 1000 mm;

[0019] Step 3: Interleave the steel curtain piles and sheets 500 mm forward, strip the surrounding rock outside the steel curtain to the design contour line, and install the steel arch frame;

[0020] Step 4: Install radial bolts between the installed steel arch frames;

[0021] Step 5: After installing multiple bays of steel arch frames, connect them longitudinally with steel sections to form a combined arch frame, and install the steel arch frames in the middle bench and the lower bench in the same way.

[0022] Advantages of the present invention:

[0023] 1. By forming a steel structure curtain in front of the tunnel face, the surrounding rock is maintained stable. During the excavation of the tunnel, a plurality of steel piles (steel sections, round pipes, Larsen steel sheet piles) are evenly penetrated below the tunnel excavation contour line in front of the tunnel face, and are connected by steel plates between adjacent two steel piles to form a support function for the tunnel face;

[0024] 2. With the setting of the advanced circular support member, by connecting multiple connecting steel piles to each other and threading the connecting steel plates into the sliding grooves of adjacent steel sections, it can advance alternately to form a steel curtain, reducing the risk of surrounding rock caving and collapse;

[0025] 3. After installing the steel arch, about 1 meter away from the arch feet of the steel arch, install inclined strut hydraulic supports to form a supporting force perpendicular to the tunnel wall and vertically upward, improving the overall support capacity.

[0026] 4. The advanced steel structure can be reused continuously if it is not deformed, with low cost. It is convenient to replace the deformed components. At the same time, the overall process is simple and easy to operate.

[0027] 5. The combined steel structure components are stressed as a whole, avoiding the risk of arch instability caused by the suspension of the arch feet when connecting the arch frames. Description of the Drawings

[0028] Figure 1 It is the front view of the overall structure of Embodiment 1 of the present application;

[0029] Figure 2 It is the side view of the overall structure of Embodiment 1 of the present application;

[0030] Figure 3 It is used to show Figure 1 the schematic diagram at position A in

[0031] Figure 4 It is Figure 3 the schematic diagram of the overall structure from another angle in

[0032] Figure 5 It is used to show Figure 1 the schematic diagram at position B in

[0033] Figure 6 It is the schematic diagram of Step 1 in Embodiment 1 of the present application;

[0034] Figure 7 It is the schematic diagram of Step 2 in Embodiment 1 of the present application;

[0035] Figure 8 It is the schematic diagram of Step 3 in Embodiment 1 of the present application;

[0036] Figure 9 It is the schematic diagram of Step 4 in Embodiment 1 of the present application;

[0037] Figure 10 It is the schematic diagram of Step 5 in Embodiment 1 of the present application;

[0038] Figure 11 It is the schematic diagram of the overall structure of the connecting steel structure of Embodiment 2 of the present application;

[0039] Figure 12 It is Figure 11 the schematic diagram from another angle in

[0040] Figure 13 It is the schematic diagram of the overall structure of the connecting steel structure of Embodiment 3 of the present application.

[0041] Among them, 2 is the support component; 21 is the tunnel support frame; 22 is the support member; 221 is the hydraulic support column; 3 is the longitudinal connecting member; 31 is the longitudinal connecting rod; 4 is the advanced cyclic support member; 42 is the connecting steel structure; 43 is the connecting steel plate; 44 is the section steel; 45 is the chute; 46 is the anti-slip hook; 51 is the upper bench; 52 is the middle bench; 53 is the lower bench; 61 is the round pipe; 71 is the connecting part; 81 is the main body part; 91 is the section steel arch frame; 92 is the radial anchor bolt. Detailed implementation manners

[0042] To describe the present invention more clearly, the present invention will be further described in detail below in conjunction with embodiments and with reference to the accompanying drawings. Those skilled in the art should understand that the specific content described below is illustrative rather than restrictive, and should not be used to limit the protection scope of the present invention.

[0043] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inner", "outer", "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, unless otherwise clearly specified and defined, the terms "installation", "connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, indirectly connected through an intermediate medium, or the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Embodiment 1:

[0045] Reference Figure 1 , which is an advanced support structure for tunnel construction disclosed in the present application, includes a support component 2. By forming a steel structure curtain in front of the heading face in the tunnel, the stability of the surrounding rock is maintained. During the excavation of the tunnel, the support component 2 provides advanced support for the heading face in the tunnel. The support component 2 includes a tunnel support frame 21 arranged on the inner wall of the tunnel and a support member 22 arranged on the tunnel support frame 21. The tunnel support frame 21 further includes a plurality of steel sheet piles penetrating through the tunnel, and the plurality of steel sheet piles are uniformly arranged along the tunnel excavation contour line. The steel plates are connected on adjacent two steel sheet piles to form the support function for the tunnel heading face.

[0046] Reference Figures 1 to 3, the support member 22 includes a step provided on the inner wall of the tunnel support frame 21. The step consists of an upper step 51, a middle step 52, and a lower step 53. The middle step 52 and the lower step 53 support the two side walls of the tunnel; the support member 22 includes a hydraulic support column 221 provided on the side wall of the tunnel support frame 21. The hydraulic support column 221 is inclined, and further includes a longitudinal connecting member 3 provided at the top of the hydraulic support column 221. The tunnel support frame 21 includes a plurality of profiled steel arches connected to the longitudinal connecting rod 31, and the plurality of profiled steel arches are evenly distributed on the inner wall of the tunnel.

[0047] The longitudinal connecting member 3 includes a plurality of longitudinal connecting rods 31 connected to the side walls of the profiled steel arches. The profiled steel arches are combined and fixed by using the longitudinal connecting rods 31, and a supporting force perpendicular to the upward direction and perpendicular to the tunnel wall is provided by setting the hydraulic support column 221. The hydraulic support column 221 abuts against the lower part of the longitudinal connecting rod 31. The tunnel support frame 21 includes a plurality of profiled steel arches connected to the longitudinal connecting rod 31, and the plurality of profiled steel arches are evenly distributed on the inner wall of the tunnel.

[0048] Reference Figures 1 to 5 , the support member 22 further includes an advanced cyclic support member 4 provided on the inner wall of the tunnel support frame 21. The advanced cyclic support member 4 is used for advanced support of the top wall (or the surrounding) of the tunnel. The advanced cyclic support member 4 includes a plurality of interconnected support modules. The advanced cyclic support member 4 further includes a profiled steel component, a round tube component, and a Larssen steel sheet pile component, which can interactively advance. The plurality of support modules are used to support the inner wall of the tunnel. The support module includes a plurality of connecting steel structures 42 connected end to end. The connecting steel structure 42 includes a profiled steel 44 and a connecting steel plate 43 provided on the side wall of the profiled steel 44. The connecting steel plate 43 is used to connect adjacent profiled steels 44. The profiled steel 44 is provided with a chute 45 for the connecting steel plate 43 to pass through. The end of the connecting steel plate 43 is provided with an anti-slip, positioning, and guiding hook 46. The anti-slip hook 46 is inserted into the chute 45. By connecting a plurality of connecting steel frames 42 to each other and inserting the anti-slip hook 46 into the chutes 45 of adjacent profiled steels 44, a steel curtain is formed, which improves the stability of the free face of the surrounding rock of the heading face and reduces the risk of surrounding rock caving and collapse.

[0049] This application also discloses an advanced support process for tunnel construction;

[0050] Reference Figure 6 , Step 1: Position and orient the first pile at the topmost position 300 mm below the design contour line in the tunnel, and then insert the first pile by means of hammering or hydraulic jacking. Then, insert the other piles in sequence to form a cyclic steel curtain, and the cyclic steel curtain is the advanced cyclic support member;

[0051] Reference Figure 7 , Step 2: Use mechanical equipment to excavate inside the cyclic steel curtain, with a footage of 500 - 1000 mm;

[0052] Reference Figure 8 Step 3: Before the interaction of the steel diaphragm wall piles and plates, insert 500 mm, strip the surrounding rock outside the steel diaphragm wall to the designed contour line, and install the steel arch frame;

[0053] Reference Figure 9 Step 4: Between the installed steel arch frames, construct radial bolts;

[0054] Reference Figure 10 Step 5: After installing multiple frames of the steel arch frame, connect them longitudinally with steel sections to form a combined arch frame. The steel arch frames in the middle bench and the lower bench are installed in the same way.

[0055] Embodiment 2

[0056] Reference Figure 11 and Figure 12 The difference from Embodiment 1 is that the connecting steel structure 42 includes a circular tube 61 and a connecting steel plate 43. The end of the connecting steel plate 43 is provided with an anti-slip hook 46, and the side wall of the circular tube 61 is provided with a chute 45 for the anti-slip hook 46 to pass through.

[0057] Embodiment 3

[0058] Reference Figure 13 The difference from Embodiment 1 is that the connecting steel frame 42 includes a plurality of mutually connected connecting steel plates 43. The connecting steel plate 43 includes a connecting portion 71 and a main body portion 81. The main body portion 81 is set as a U shape, and the connecting portion 71 is set as a connecting hook for connecting the mutually connected connecting steel plates 43.

[0059] Obviously, the above embodiments of the present invention are merely examples for more clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is impossible to enumerate all the implementation methods here. Any obvious changes or modifications derived from the technical solutions of the present invention still fall within the protection scope of the present invention.

Claims

1. An advanced support structure for tunnel construction, characterized in that: It includes a support component (2), the support component (2) is arranged on the inner wall of the tunnel, the support component (2) includes a tunnel support frame (21) arranged on the inner wall of the tunnel, and further includes a support member (22) arranged on the tunnel support frame (21), and the support member (22) includes a step arranged on the inner wall of the tunnel support frame (21); The support member (22) includes a hydraulic support column (221) arranged on the side wall of the tunnel support frame (21), and further includes a longitudinal connecting member (3) arranged on the top of the hydraulic support column (221); The support member (22) further includes an advanced cyclic support member (4) arranged on the inner wall of the tunnel support frame (21), and the advanced cyclic support member (4) includes a plurality of interconnected support modules, and the plurality of support modules are used to support the inner wall of the tunnel; The support module includes a plurality of connecting steel structures (42) connected end to end, the connecting steel structure (42) includes a section steel (44) and a connecting steel plate (43) arranged on the side wall of the section steel (44), and the connecting steel plate (43) is used to connect adjacent section steels (44); A chute (45) for the connecting steel plate (43) to pass through is arranged on the section steel (44), and an anti-slip hook (46) is arranged at the end of the connecting steel plate (43), and the anti-slip hook (46) is arranged in the chute (45); The step includes an upper step (51), a middle step (52) and a lower step (53), and a plurality of the hydraulic support columns (221) are arranged and all are arranged at the bottom of the longitudinal connecting member (3); The longitudinal connecting member (3) includes a plurality of longitudinal connecting rods (31), and the top of the hydraulic support column (221) is arranged at the bottom of the plurality of longitudinal connecting rods (31); The tunnel support frame (21) includes a plurality of section steel arch frames connected to the longitudinal connecting rods (31), and the plurality of section steel arch frames are evenly distributed on the inner wall of the tunnel; The tunnel support frame (21) further includes a plurality of steel sheet piles penetrating into the tunnel interior, and the plurality of steel sheet piles are evenly arranged along the tunnel excavation contour line.

2. The advanced support structure for tunnel construction according to claim 1, characterized in that: The hydraulic support column (221) is arranged obliquely.

3. An advanced support process for tunnel construction, including an advanced support structure for tunnel construction according to claim 1 or 2, characterized in that: Step 1: Position and orient the first pile at the topmost position 300 mm below the design contour line in the tunnel, then insert the first pile by means of hammering or hydraulic jacking, and then insert the other piles in sequence to form a circular steel curtain, and the circular steel curtain is the advanced cyclic support member; Step 2: Excavate with mechanical equipment inside the circular steel curtain, with a footage of 500 - 1000 mm; Step 3: Interleave the steel curtain pile plates and insert them 500 mm forward, strip the surrounding rock outside the steel curtain to the design contour line, and install the section steel arch frame; Step 4: Construct radial bolts between the installed section steel arch frames; Step 5: After installing multiple sections of the section steel arch frame, connect them longitudinally with section steel to form a combined arch frame, and install the section steel arch frame in the same way for the middle step and the lower step.

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