A high-strength corrugated plate structure and method for tunnel reinforcement

Abstract

The present invention discloses a high-strength corrugated plate structure and method for tunnel reinforcement, which relates to the field of tunnel engineering technology. The key points of the technical solution are: it includes a sinusoidal corrugated sheet, which is a plate-shaped arch structure; the concave surface of the sinusoidal corrugated sheet is evenly spaced with a plurality of hollow arch ribs consisting of an arch frame and an arch hole; the arch frame and the sinusoidal corrugated sheet are integrally formed by die casting. The high-strength corrugated plate structure can be closely attached to the surrounding rock and cooperate with it to bear force, and can deform appropriately with the surrounding rock in high-stress surrounding rock to release stress, so that the support structure and the surrounding rock can reach a better coordinated stress state, and the reinforcement system has strong seismic resistance and durability; at the same time, the high-strength corrugated structure can also be grouting reinforced for the arch hole, and used in combination with shotcrete, anchor support and backfill grouting behind the lining to form a combined support structure that can bear force together, which can significantly improve the stress characteristics of the lining structure and improve the stability of the surrounding rock.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel engineering, and more particularly to a high-strength corrugated plate structure and method for tunnel reinforcement. Background Art

[0002] my country has a vast territory and a complex geological environment. Due to the limitations of the technical level of design, construction, and monitoring during the construction period, early tunnels often have defects such as insufficient lining thickness, cavities behind the lining, or insufficient concrete strength. During the operation of these tunnels, under the combined effects of factors such as train loads and surrounding rock pressure, they are very likely to cause lining cracking, leakage, block falling, lining deformation and limit intrusion, tunnel bottom cracking, tunnel bottom sinking and mud bubbling, arching, drainage system freezing damage and other diseases. These diseases deteriorate the service performance of the tunnel, reduce the safety reliability and stability of the tunnel structure, and seriously threaten the driving safety of the tunnel.

[0003] Depending on the type of tunnel disease, high-pressure injection, anchor injection, glue injection, chiseling and drainage, or sleeve lining treatment are usually used. Some adopt a comprehensive treatment measure of "polymer-modified cement-based repair mortar + mesh repair + glass fiber cloth". If there are large-scale voids and blocks in the lining, it is necessary to remove the surface concrete and re-apply the secondary lining for treatment. These methods have problems such as difficult construction technology, complicated procedures, incomplete treatment or high maintenance costs to varying degrees, resulting in secondary diseases in the repaired tunnel not long after operation, posing a major hidden danger to the safe operation of the tunnel. Therefore, it is urgent to propose a safe, reliable and applicable comprehensive treatment technology for tunnel diseases. Summary of the invention

[0004] The purpose of the present invention is to provide a high-strength corrugated plate structure and method for tunnel reinforcement, the high-strength corrugated plate structure can be closely attached to the surrounding rock and cooperate with it to bear stress, can deform appropriately with the surrounding rock in high-stress surrounding rock to release stress, so that the support structure and the surrounding rock can reach a better coordinated stress state, and the reinforcement system has strong seismic resistance and durability; at the same time, the high-strength corrugated structure can also be used for grouting reinforcement of the arch hole, and combined with shotcrete, anchor support and backfill grouting behind the lining to form a combined support structure that can bear stress together, which can significantly improve the stress characteristics of the lining structure and improve the stability of the surrounding rock. The method has simple construction procedures and low costs, and is highly applicable to the treatment of various tunnel diseases, especially for situations with poor geological conditions and weak surrounding rock stability.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: a high-strength corrugated plate structure for tunnel reinforcement, comprising a sinusoidal corrugated sheet, wherein the sinusoidal corrugated sheet is a plate-shaped arch structure; a plurality of hollow arch ribs are evenly spaced on the concave surface of the sinusoidal corrugated sheet; the hollow arch ribs include an arch frame and an arch hole, wherein the arch hole is located between the arch frame and the concave surface of the sinusoidal corrugated sheet, and the arch frame and the sinusoidal corrugated sheet are integrally formed by die-casting.

[0006] By adopting the above technical scheme, in the process of tunnel reinforcement, firstly, the lining or surrounding rock of the tunnel is subjected to corresponding reinforcement pretreatment according to the different disease conditions of the tunnel, and then the high-strength corrugated plate structure of suitable size is closely attached to the surface of the lining or surrounding rock of the tunnel, and multiple full-length mortar anchor rods or hollow grouting anchor rods with a length of not less than 2.5m are installed at equal intervals, and then the anchor rods and the high-strength corrugated plate are locked together by nuts and anchor pads to form a supporting whole, which is jointly stressed; the sinusoidal corrugated sheet of the plate-like arch structure can be closely attached to the surrounding rock and cooperate with it to bear stress; at the same time, the flexural stiffness and compressive strength of the sinusoidal corrugated sheet of the plate-like arch structure are higher than those of ordinary The arch frame or steel plate of the specification has been greatly increased, and has strong earthquake resistance and durability; through the arch hole, it is convenient to carry out grouting operation into the hollow arch rib; the high-strength corrugated structure is a semi-rigid structure, which can deform appropriately with the surrounding rock in the high-stress surrounding rock to release stress, so that the support structure and the surrounding rock can achieve a better coordinated stress state, and the surrounding rock can also be adjusted to a more stable state; at the same time, the high-strength corrugated structure can also be grouting reinforced on the arch hole 3, and used in combination with shotcrete, anchor support and backfill grouting behind the lining to form a combined support structure that can bear stress together, which can significantly improve the stress characteristics of the lining structure.

[0007] The present invention is further configured as follows: the spacing between the hollow arch ribs is 35 to 70 cm.

[0008] By adopting the above technical solution, the spacing between the hollow arch ribs is 35 to 70 cm, which is convenient for ensuring the bending stiffness, compressive strength, seismic resistance and durability of the high-strength corrugated plate.

[0009] The present invention is further configured as follows: the sinusoidal corrugated sheet is formed by pressing a thin steel plate or aluminum alloy plate surface with a thickness of 3 to 5 mm.

[0010] By adopting the above technical solution, a thin steel plate or aluminum alloy plate with a thickness of 3 to 5 mm is used to press the sinusoidal corrugated sheet, so that the sinusoidal corrugated sheet has a semi-rigid structure, ensuring that it can deform appropriately with the surrounding rock in high-stress surrounding rock to release stress, so that the support structure and the surrounding rock can achieve a better coordinated stress state.

[0011] The present invention is further configured such that: the surface of the sinusoidal corrugated sheet is plated with a zinc layer.

[0012] By adopting the above technical solution, the zinc layer is plated on the surface of the sinusoidal corrugated sheet, so that the surface of the sinusoidal corrugated sheet is not easily corroded, which is convenient for ensuring the durability of the sinusoidal corrugated sheet.

[0013] The present invention is further configured as follows: the diameter of the arched hole is 5 cm.

[0014] By adopting the above technical solution, the 5 cm arched hole can be easily reinforced by grouting as needed.

[0015] The present invention is further configured such that: a grouting body is poured inside the hollow arch rib.

[0016] By adopting the above technical solution, the overall stiffness and compressive resistance of the high-strength corrugated plate structure can be increased through the grouting inside the hollow arch rib.

[0017] A method for supporting a high-strength corrugated plate structure for tunnel reinforcement, comprising the following steps:

[0018] S1. Use advanced detection technology to find out the tunnel damage, analyze the tunnel stress behavior through theoretical methods, combine the detection and theoretical analysis results to evaluate the tunnel stability and obtain the evaluation results;

[0019] S2. According to the evaluation results in step S1, corresponding reinforcement pretreatment is performed for different conditions of tunnel damage, in preparation for further reinforcement using high-strength corrugated plates;

[0020] S3, in step S2, the pre-treated lining or surrounding rock surface is reinforced to be closely attached to the high-strength corrugated plate structure, and multiple anchor rods with a spacing of 0.8 to 1.2 m are installed, and then the anchor rods and the high-strength corrugated plate are locked together at the anchor rod heads using nuts and anchor pads, so that the anchor rods and the high-strength corrugated plate form a supporting whole that is subjected to common force;

[0021] S4. Spray concrete or cast concrete on the surface of the high-strength corrugated plate to make the surface of the high-strength corrugated plate flush with the original lining surface to form a complete concrete lining structure.

[0022] The present invention is further configured as follows: the specific method for performing corresponding reinforcement pretreatment for different conditions of tunnel damage in step S2 is:

[0023] A. For the situation where there are cavities behind the lining, the surface rock and soil are removed, and then the rubble concrete is used to fill the voids.

[0024] B. For large open cracks in the lining, groove drawing and grouting reinforcement are carried out;

[0025] C. If there is a large area of ​​falling blocks in the lining, the surface concrete is chiseled off, mesh is hung, and then concrete is sprayed to level it;

[0026] D. For situations where there are fault fracture zones or crack-intensive zones that have deteriorated and deformed, grouting reinforcement is carried out.

[0027] The present invention is further configured as follows: the anchor rod described in step S3 is a full-length mortar anchor rod or a hollow grouting anchor rod, and the length of the anchor rod is not less than 2.5 m.

[0028] The present invention is further configured as follows: before the high-strength corrugated plate structure is closely attached to the lining or surrounding rock surface in step S3, in view of the situation where the lining is seriously damaged, the surrounding rock is seriously deteriorated or the surrounding rock pressure is large, the arched holes at the ends of the high-strength corrugated plate are used to inject grout into the hollow arch ribs of the high-strength corrugated plate to increase the overall stiffness and compressive resistance of the high-strength corrugated plate.

[0029] In summary, the present invention has the following beneficial effects: the sinusoidal corrugated sheet of the plate-like arch structure can be closely attached to the surrounding rock and bear force with it; at the same time, the bending stiffness and compressive strength of the sinusoidal corrugated sheet of the plate-like arch structure are greatly increased compared with conventional arch frames or steel plates, and have strong earthquake resistance and durability; the arch holes facilitate the grouting operation inside the hollow arch rib; the high-strength corrugated structure is a semi-rigid structure, which can deform appropriately with the surrounding rock in high-stress surrounding rock to release stress, making it easier for the support structure to be close to the surrounding rock. A better coordinated stress state can be achieved, and the surrounding rock can also be adjusted to a more stable state; at the same time, the high-strength corrugated structure can also be used to grout the arch hole for reinforcement, and used in conjunction with shotcrete, anchor support and backfill grouting behind the lining to form a combined support structure that can bear stress together, which can significantly improve the stress characteristics of the lining structure; the high-strength corrugated plate structure is simple to manufacture, convenient to reinforce and construct, and has excellent overall stress performance. It is highly applicable to the treatment of various tunnel diseases, especially for situations with poor geological conditions and weak self-stabilization ability of the surrounding rock. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of a high-strength corrugated plate structure in Example 1 of the present invention;

[0031] Figure 2 is a schematic cross-sectional structural diagram of a high-strength corrugated plate structure in Example 1 of the present invention;

[0032] Figure 3 yes Figure 2 The schematic diagram of the structure after being cut along the AA line;

[0033] Figure 4 This is a flow chart of Embodiment 2 of the present invention.

[0034] In the figure: 1. Sinusoidal corrugated sheet; 2. Arch frame; 3. Arch hole; 4. Zinc layer; 5. Grouting body. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-4 The present invention is described in further detail.

[0036] Example 1: A high-strength corrugated plate structure for tunnel reinforcement, such as Figure 1 , Figure 2 and Figure 3 As shown, it includes a sinusoidal corrugated sheet 1, which is a plate-shaped arched structure. The concave surface of the sinusoidal corrugated sheet 1 is provided with a plurality of hollow arch ribs at equal intervals. The hollow arch ribs include an arch frame 2 and an arched hole 3, and the arched hole 3 is located between the arch frame 2 and the concave surface of the sinusoidal corrugated sheet 1. The arch frame 2 and the sinusoidal corrugated sheet 1 are integrally formed by die casting.

[0037] In this embodiment, during the process of reinforcing the tunnel, firstly, the lining or surrounding rock of the tunnel is subjected to corresponding reinforcement pretreatment according to the different tunnel disease conditions. The technical parameters such as the size, thickness and spacing of the protruding arch frame 2 of the high-strength corrugated plate structure can be flexibly adjusted according to the type, scale and surrounding rock pressure of the actual tunnel disease and die-cast once, and the surface of the high-strength corrugated plate structure is hot-dip galvanized and insulated. Then, the die-cast high-strength corrugated plate structure of suitable size is closely attached to the surface of the tunnel lining or surrounding rock, and multiple full-length mortar anchor rods or hollow grouting anchor rods with a length of not less than 2.5m are equally spaced, and then the anchor rods and the high-strength corrugated plate are locked together by nuts and anchor pads to form a supporting whole, which is jointly stressed. Through the sinusoidal corrugated sheet 1 of the plate-like arch structure, the high-strength corrugated plate structure can be closely attached to the surrounding rock and cooperate with it to bear stress. At the same time, the bending rigidity and compressive strength of the sinusoidal corrugated sheet 1 of the plate-like arch structure are greatly increased compared with the conventional arch frame 2 or steel plate. The hollow structure can save materials and has strong earthquake resistance and durability. The arch hole 3 facilitates the grouting operation inside the hollow arch rib. The high-strength corrugated plate structure is a semi-rigid structure, which can deform appropriately with the surrounding rock in high-stress surrounding rock to release stress, so that the support structure and the surrounding rock can achieve a better coordinated stress state, and the surrounding rock can also be adjusted to a more stable state. At the same time, the high-strength corrugated structure can also be used to grout the arch holes of the arch frame 2 for reinforcement, and can be used in combination with shotcrete, anchor support and backfill grouting behind the lining to form a combined support structure that can bear stress together, which can significantly improve the stress characteristics of the lining structure.

[0038] The spacing between hollow arch ribs is 35 to 70 cm.

[0039] In this embodiment, the spacing between the hollow arch ribs is 35 to 70 cm, which is convenient for ensuring the bending stiffness, compressive strength, earthquake resistance and durability of the high-strength corrugated plate.

[0040] The sinusoidal corrugated sheet is pressed from a thin steel plate or aluminum alloy plate with a thickness of 3 to 5 mm.

[0041] In this embodiment, a thin steel plate or aluminum alloy plate with a thickness of 3 to 5 mm is used to press the surface of the sinusoidal corrugated sheet, so that the sinusoidal corrugated sheet has a semi-rigid structure, ensuring that it can deform appropriately with the surrounding rock in high-stress surrounding rock to release stress, so that the support structure and the surrounding rock can achieve a better coordinated stress state.

[0042] The surface of the sinusoidal corrugated sheet is plated with a zinc layer 4.

[0043] In this embodiment, the zinc layer 4 plated on the surface of the sinusoidal corrugated sheet makes the surface of the sinusoidal corrugated sheet less susceptible to corrosion, thereby ensuring the durability of the sinusoidal corrugated sheet.

[0044] The diameter of the arched hole 3 is 5 cm.

[0045] In this embodiment, the arched hole 3 with a diameter of 5 cm facilitates grouting reinforcement of the arched hole 3 as needed.

[0046] The hollow arch rib is filled with a grouting body 5.

[0047] In this embodiment, in case of serious tunnel lining disease, serious tunnel surrounding rock deterioration or high tunnel surrounding rock pressure, the grouting body 5 inside the hollow arch rib is used to increase the overall stiffness and compressive resistance of the high-strength corrugated plate structure.

[0048] Embodiment 2: A method for supporting a high-strength corrugated plate structure for tunnel reinforcement, such as Figure 4 As shown, the following steps are included:

[0049] S1. Use advanced detection technology to find out the tunnel damage, analyze the tunnel stress behavior through theoretical methods, combine the detection and theoretical analysis results, evaluate the tunnel stability and obtain the evaluation results.

[0050] S2. According to the evaluation results in step S1, corresponding reinforcement pretreatment is performed for different conditions of tunnel damage, in preparation for subsequent further reinforcement using high-strength corrugated plates.

[0051] S3. In step S2, the pre-treated lining or surrounding rock surface is reinforced to be closely attached to the high-strength corrugated plate structure, and multiple anchor rods with a spacing of 0.8 to 1.2 m are installed. Then, nuts and anchor pads are used to lock the anchor rods and the high-strength corrugated plate together at the anchor rod heads, so that the anchor rods and the high-strength corrugated plate form a supporting whole that is subjected to common force.

[0052] S4. Spray concrete or cast concrete on the surface of the high-strength corrugated plate to make the surface of the high-strength corrugated plate flush with the original lining surface to form a complete concrete lining structure.

[0053] The specific method of performing corresponding reinforcement pretreatment for different conditions of tunnel damage in step S2 is:

[0054] A. For the situation where there are cavities behind the lining, remove the surface rock and soil, and then use rubble concrete to fill the voids.

[0055] B. In case of large open cracks in the lining, groove drawing and grouting reinforcement are carried out.

[0056] C. In case of large-scale falling of lining, remove the surface concrete, hang a mesh, and then spray concrete to level it.

[0057] D. For situations where there are fault fracture zones or crack-intensive zones that have deteriorated and deformed, grouting reinforcement is carried out.

[0058] The anchor rod in step S3 is a full-length mortar anchor rod or a hollow grouting anchor rod, and the length of the anchor rod is not less than 2.5m.

[0059] Before the high-strength corrugated plate structure is closely attached to the lining or surrounding rock surface in step S3, in case of serious lining damage, serious surrounding rock deterioration or high surrounding rock pressure, the arched holes 3 at the ends of the high-strength corrugated plate are used to inject grout into the hollow arch ribs of the high-strength corrugated plate to increase the overall stiffness and compressive resistance of the high-strength corrugated plate.

[0060] Working principle: In the process of tunnel reinforcement, firstly, the lining or surrounding rock of the tunnel is subjected to corresponding reinforcement pretreatment according to the different diseases of the tunnel, and then the high-strength corrugated plate structure of suitable size is closely attached to the surface of the lining or surrounding rock of the tunnel, and multiple full-length mortar anchor rods or hollow grouting anchor rods with a length of not less than 2.5m are installed at equal intervals, and then the anchor rods and the high-strength corrugated plate are locked together by nuts and anchor pads to form a supporting whole, which is jointly stressed. The sinusoidal corrugated sheet of the plate-like arch structure can be closely attached to the surrounding rock and bear stress with it. At the same time, the bending stiffness and compressive strength of the sinusoidal corrugated sheet of the plate-like arch structure are greatly increased compared with conventional arch frames 2 or steel plates, and have strong seismic resistance and durability. The arch hole 3 facilitates the operation of grouting into the hollow arch rib. The high-strength corrugated structure is a semi-rigid structure that can deform appropriately with the surrounding rock in high-stress surrounding rock to release stress, so that the support structure and the surrounding rock can achieve a better coordinated stress state, and the surrounding rock can also be adjusted to a more stable state. At the same time, the high-strength corrugated structure also performs grouting reinforcement on the arch hole 3 in the arch frame 2, and is used in conjunction with shotcrete, anchor support, and backfill grouting behind the lining to form a combined structure that can bear stress together, significantly improving the stress characteristics of the lining structure.

[0061] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A high-strength corrugated plate structure for tunnel reinforcement, characterized by: Including sine The invention discloses a sinusoidal corrugated sheet (1), wherein the sinusoidal corrugated sheet (1) is a plate-shaped arched structure; the surface of the sinusoidal corrugated sheet (1) is plated with a zinc layer (4); the concave surface of the sinusoidal corrugated sheet (1) is provided with a plurality of hollow arch ribs at equal intervals; the hollow arch ribs include an arch frame (2) and an arched hole (3); the arched hole (3) is located between the arch frame (2) and the concave surface of the sinusoidal corrugated sheet (1); a grouting body (5) is poured into the arched hole (3); the arch frame (2) and the sinusoidal corrugated sheet (1) are integrally formed by die-casting.

2. The high-strength corrugated plate structure for tunnel reinforcement according to claim 1 is characterized by: The spacing between the hollow arch ribs is 35 to 70 cm.

3. The high-strength corrugated plate structure for tunnel reinforcement according to claim 1 is characterized by: The diameter of the arched hole (3) is 5 cm.

4. A method for supporting a high-strength corrugated plate structure for tunnel reinforcement, using the high-strength corrugated plate structure for tunnel reinforcement according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1. Use advanced detection technology to find out the tunnel damage, analyze the tunnel stress behavior through theoretical methods, combine the detection and theoretical analysis results to evaluate the tunnel stability and obtain the evaluation results; S2. According to the evaluation results in step S1, corresponding reinforcement pretreatment is performed for different conditions of tunnel damage, in preparation for further reinforcement using high-strength corrugated plates; S3, in case of lining disease, surrounding rock deterioration and surrounding rock pressure that affect tunnel stability, grouting is performed into the hollow arch rib of the high-strength corrugated plate by using the arched hole (3) at the end of the high-strength corrugated plate to increase the overall stiffness and compressive strength of the high-strength corrugated plate. In step S2, the pre-treated lining or surrounding rock surface is reinforced to be closely attached to the high-strength corrugated plate structure, and multiple anchor rods with a spacing of 0.8 to 1.2 m are installed. Then, nuts and anchor pads are used to lock the anchor rods and the high-strength corrugated plate together at the anchor rod heads, so that the anchor rods and the high-strength corrugated plate form a supporting whole that is subjected to common force. S4. Spray concrete or cast concrete on the surface of the high-strength corrugated plate to make the surface of the high-strength corrugated plate flush with the original lining surface to form a complete concrete lining structure.

5. A method for supporting a high-strength corrugated plate structure for tunnel reinforcement according to claim 4, characterized in that: The specific method of performing corresponding reinforcement pretreatment for different conditions of tunnel damage in step S2 is: A. For the situation where there are cavities behind the lining, the surface rock and soil are removed, and then the rubble concrete is used to fill the voids. B. For the situation where there are open cracks in the lining, groove drawing and grouting reinforcement shall be carried out; C. If there is any falling of lining, remove the surface concrete, hang the mesh, and then spray concrete to level it; D. For situations where there are fault fracture zones or crack-intensive zones that have deteriorated and deformed, grouting reinforcement is carried out.

6. A method for supporting a high-strength corrugated plate structure for tunnel reinforcement according to claim 4, characterized in that: The anchor rod described in step S3 is a full-length mortar anchor rod or a hollow grouting anchor rod, and the length of the anchor rod is not less than 2.5m.

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