Underground karst landform diversion tunnel penetrating type crack repairing structure

Abstract

The utility model relates to the technical field of water conservancy and hydropower engineering tunnel repairing, and discloses an underground karst landform diversion tunnel penetrating type crack repairing structure. Comprising a lining body, wedge-shaped grooves, reinforcing steel bars and high-strength preshrinking mortar. A penetrating crack is developed at the joint of the bottom plate and the side wall of the lining body; the wedge-shaped groove is formed in the lining body and located in the penetrating crack. The reinforcing steel bars are arranged in the wedge-shaped grooves; and the high-strength preshrinking mortar is filled in the wedge-shaped groove. A wedge-shaped groove is formed in the penetrating type crack of the lining body, reinforcing steel bars are placed in the wedge-shaped groove, and high-strength preshrinking mortar is filled in the wedge-shaped groove. The reinforcing steel bars can effectively increase the tensile strength of the crack repairing part. And the reinforcing steel bars can share tensile stress, so that the repaired structure can better resist further expansion of the crack. And the high-strength preshrinking mortar is tightly combined with the lining body and wraps the reinforcing steel bars. And the space of the wedge-shaped groove can be filled, so that an organic whole is formed between the reinforcing steel bar and the lining body.

Description

Technical Field

[0001] This utility model relates to the field of tunnel repair technology in water conservancy and hydropower engineering, and in particular to a repair structure for through-type cracks in underground karst landform water diversion tunnels. Background Technology

[0002] Southwest my country is rich in water resources and has seen the construction of numerous water conservancy and hydropower projects. However, the region also contains many karst landforms. Karst landforms are considered unfavorable geological phenomena, and underground karst landforms mainly include caves, underground cavities, and subterranean rivers, exhibiting complex structures. As a major structure in these projects, water diversion tunnels are highly susceptible to developing longitudinal penetrating cracks under these geological conditions, affecting tunnel stability and posing significant safety hazards.

[0003] Water diversion tunnels located in underground karst areas are prone to developing numerous geological faults, cavities, sinkholes, and underground rivers, resulting in significant pressure differences between the inside and outside of the tunnel. These tunnels are generally pressurized, with their structural stress primarily controlled by internal water pressure. Under normal conditions, reinforced concrete is used for secondary lining after tunnel excavation and primary support. Weak points in the lining are prone to developing through-cracks under these geological conditions, especially at the junction of the floor slab and sidewalls. These cracks further develop under long-term high pressure, forming large seepage channels that can lead to water inrush or even collapse, significantly impacting the safe operation of the water diversion tunnel.

[0004] Currently, conventional techniques such as surface treatment, grouting, and filling are generally used to repair through-cracks in water diversion tunnels in underground karst areas. Grouting cannot be used in underground karst landforms, surface treatment is not suitable for this type of working condition and has poor durability, and conventional filling cannot guarantee the connection strength. Under long-term water erosion, it is easy to fall off and fail, resulting in poor repair effect. Utility Model Content

[0005] The present invention aims to provide a repair structure for through-type cracks in underground karst landform water diversion tunnels, in order to solve the technical problems proposed in the prior art.

[0006] The technical problem solved by this utility model embodiment is addressed by the following technical solution:

[0007] A repair structure for penetrating cracks in underground karst landform water diversion tunnels is provided, comprising:

[0008] The lining has through-cracks at the junction of its bottom plate and sidewall.

[0009] A wedge-shaped groove, wherein the wedge-shaped groove is formed on the lining and located on the through crack;

[0010] Reinforcing bars are provided within the wedge-shaped groove;

[0011] High-strength pre-shrinkable mortar is filled into the wedge-shaped groove.

[0012] In some embodiments, the size of the wedge-shaped groove is adapted to the size of the through crack in the lining.

[0013] In some embodiments, the high-strength pre-shrink mortar is compliant with the base plate of the lining and the sidewalls.

[0014] In some embodiments, the wedge-shaped groove is coated with a new and old concrete interface agent.

[0015] In some embodiments, the high-strength pre-shrink mortar is filled in layers within the wedge-shaped groove.

[0016] In some embodiments, the lining is provided with a double layer of reinforcing bars, and the reinforcing bars are welded to the double layer of reinforcing bars to increase the connection strength.

[0017] Compared with existing technologies, the underground karst landform water diversion tunnel through-crack repair structure provided in this embodiment of the utility model includes a lining, a wedge-shaped groove, reinforcing steel bars, and high-strength pre-shrinkable mortar. A through-crack is formed at the junction of the bottom slab and sidewall of the lining; the wedge-shaped groove is formed on the lining and located on the through-crack; the reinforcing steel bars are placed within the wedge-shaped groove; and the high-strength pre-shrinkable mortar is filled within the wedge-shaped groove. A wedge-shaped groove is set at the through-crack in the lining, reinforcing steel bars are placed inside, and high-strength pre-shrinkable mortar is filled. The reinforcing steel bars effectively increase the tensile strength of the crack repair area. The reinforcing steel bars can share tensile stress, allowing the repaired structure to better resist further crack propagation. The high-strength pre-shrinkable mortar is tightly bonded to the lining, simultaneously encasing the reinforcing steel bars within it. It fills the space of the wedge-shaped groove, forming an organic whole between the reinforcing steel bars and the lining. Attached Figure Description

[0018] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0019] Figure 1 This is a transverse sectional view of a repair structure for a through-type crack in an underground karst landform water diversion tunnel provided in one embodiment of this utility model;

[0020] Figure 2 yes Figure 1 Enlarged diagram of point A in the middle.

[0021] Figure label:

[0022] 100. Repair structure for through-cracks in underground karst landform water diversion tunnels; 10. Lining; 11. Double-layer reinforcement; 20. Wedge-shaped groove; 30. Reinforcing steel; 40. High-strength pre-shrink mortar; 50. Through-crack. Detailed Implementation

[0023] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly on the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "left," "right," "upper end," "lower end," "top," and "bottom," etc., used in this specification, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention.

[0025] The following is combined with Figure 1 and Figure 2 The present application provides a detailed description of the underground karst landform water diversion tunnel through-type crack repair structure through specific embodiments.

[0026] Please see Figure 1 and Figure 2 , Figure 1 This is a transverse sectional view of a repair structure for a through-type crack in an underground karst landform water diversion tunnel provided in one embodiment of this utility model; Figure 2 yes Figure 1 Enlarged schematic diagram at point A. One embodiment of this utility model provides a repair structure 100 for through-cracks in an underground karst landform water diversion tunnel, comprising a lining 10, a wedge-shaped groove 20, reinforcing steel bars 30, and high-strength pre-shrinkable mortar 40. A through-crack 50 is formed at the junction of the bottom slab and the sidewall of the lining 10; the wedge-shaped groove 20 is formed on the lining 10 and located on the through-crack 50; the reinforcing steel bars 30 are placed within the wedge-shaped groove 20; and the high-strength pre-shrinkable mortar 40 is filled within the wedge-shaped groove 20.

[0027] A wedge-shaped groove 20 is installed at the through-crack in the lining 10, a reinforcing steel bar 30 is inserted, and high-strength pre-shrinkable mortar 40 is filled in. The reinforcing steel bar 30 effectively increases the tensile strength of the repaired crack. Because in the working environment of the water diversion tunnel, especially under internal water pressure, the crack is easily subjected to tensile stress. The reinforcing steel bar 30 can share the tensile stress, allowing the repaired structure to better resist further crack propagation. The high-strength pre-shrinkable mortar 40 is tightly bonded to the lining 10, while simultaneously encasing the reinforcing steel bar 30 within it. It fills the space of the wedge-shaped groove 20, forming an organic whole between the reinforcing steel bar 30 and the lining 10. Compared with conventional filling methods, this combination effectively avoids the problem of filler material falling off and failing under long-term water erosion, ensuring the connection strength of the repaired structure. For water diversion tunnels in underground karst landforms, they face complex geological conditions, such as geological faults, cavities, sinkholes, and underground rivers, resulting in a large water pressure difference between the inside and outside of the tunnel. This repair structure can better cope with high water pressure conditions. High-strength pre-shrink mortar 40 itself has good impermeability and can prevent water from seeping through cracks to a certain extent, reducing the formation of seepage channels. The combination of reinforcing steel 30 and high-strength pre-shrink mortar 40 enables the repaired lining 10 to maintain structural stability under long-term high water pressure. Compared with surface treatment methods in such complex working conditions and with poor durability, this repair structure can more effectively prevent cracks from developing further under long-term high pressure, thereby reducing the risk of water inrush or even collapse inside the tunnel and ensuring the safe operation of the water diversion tunnel.

[0028] In some embodiments, the size of the wedge groove 20 is adapted to the size of the through crack 50 on the lining 10. When the size of the wedge groove 20 is adapted to the size of the through crack, it ensures that the repair material completely covers and fills the crack. If the wedge groove 20 is too large, it will require too much high-strength pre-shrink mortar 40, which will not only increase costs but may also increase the self-weight of the repaired structure, placing an additional burden on the lining 10. Moreover, excessive space may prevent the reinforcing steel 30 from functioning properly and effectively resisting the stress at the crack. Conversely, if the wedge groove 20 is too small, it will not be able to completely contain the crack, leaving part of the crack exposed and unable to be effectively repaired. This will allow water pressure to continue to act on the unrepaired crack portion, causing the crack to continue to propagate and the structure to deteriorate. The adapted wedge groove 20 can act like a customized "patch," precisely fitting the crack, allowing the reinforcing steel 30 and the high-strength pre-shrink mortar 40 to fully exert their repair function and effectively prevent further crack development.

[0029] In some embodiments, the high-strength pre-shrinkable mortar 40 is compliantly connected to the base plate and sidewalls of the lining 10. This compliant connection allows the repaired portion to form a continuous whole with the original lining 10 structure. This continuity ensures the smooth transfer of force throughout the structure when the water diversion tunnel is subjected to loads such as internal water pressure and external soil and rock pressure. For example, when internal water pressure acts on the lining 10, the force is transferred from the lining 10 to the repaired portion. If the high-strength pre-shrinkable mortar 40 is not compliantly connected to the base plate and sidewalls, a sudden stress change will occur at the connection point, potentially causing the repaired portion to separate from the original lining 10, thereby reducing the structure's load-bearing capacity. The compliant connection allows the repaired structure to function collaboratively with the complete lining 10. The base plate and sidewalls are interconnected during stress loading, and the repaired portion can share various forces such as tension, compression, and shear with them. Just like a complete chain, each link is closely connected and shares the external force, rather than acting independently, thus enhancing the stability of the entire water diversion tunnel lining structure 10.

[0030] In some embodiments, a new-old concrete interface agent is brushed into the wedge-shaped groove 20. Applying this interface agent significantly enhances the bond between the high-strength pre-shrinkage mortar 40 and the lining 10. Because the lining 10 is an older concrete structure, its surface properties differ from the newly filled high-strength pre-shrinkage mortar 40. The interface agent improves the bond between the new and old materials. Good adhesion prevents the high-strength pre-shrinkage mortar 40 from detaching from the surface of the lining 10 during long-term stress. For example, when the water diversion tunnel is subjected to internal water pressure, a firmly bonded repair material better resists the peeling force generated by the water pressure, ensuring the integrity of the repaired structure.

[0031] In some embodiments, the high-strength pre-shrinkable mortar 40 is filled in layers within the wedge-shaped groove 20. Compared to single-layer filling, layered filling avoids internal defects caused by excessive mortar thickness. If the mortar layer is too thick, uneven shrinkage may occur during solidification, leading to internal cracks or pores. Layered filling allows each layer of mortar to solidify under suitable conditions, reducing the occurrence of such internal defects and thus ensuring the filling quality of the high-strength pre-shrinkable mortar 40.

[0032] In some embodiments, the lining 10 is provided with double-layer steel reinforcement 11, and the reinforcing steel 30 is welded to the double-layer steel reinforcement 11 to increase the connection strength. The provision of double-layer steel reinforcement 11 in the lining 10 significantly improves the load-bearing capacity of the lining 10. Steel reinforcement has excellent tensile properties, and in the complex stress environment of underground karst landform water diversion tunnels, such as withstanding internal water pressure, external rock and soil pressure, and possible seismic forces, the double-layer steel reinforcement 11 can effectively resist tensile stress. When the reinforcing steel 30 is welded to the double-layer steel reinforcement 11, a more stable steel reinforcement network is formed.

[0033] After the reinforcing steel bar 30 is welded to the double-layer reinforcing steel bar 11, the stress can be more rationally distributed between the lining 10 and the repair structure. When the water diversion tunnel is subjected to internal and external forces, the stress will be evenly transmitted to the entire structure through the steel reinforcement network. This can avoid stress concentration at the junction of the repair area and the lining 10.

[0034] It should be noted that the underground karst landform water diversion tunnel through-type crack repair structure 100 provided in this utility model embodiment only shows the part related to the technical problem to be solved by this utility model embodiment. It can be understood that the underground karst landform water diversion tunnel through-type crack repair structure 100 provided in this utility model embodiment also includes other structures for realizing the function of the underground karst landform water diversion tunnel through-type crack repair structure 100, which will not be described in detail again.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this utility model as described above. For the sake of brevity, they are not provided in detail; although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A repair structure for through-cracks in underground karst landform water diversion tunnels, characterized in that, include: The lining has through-cracks at the junction of its bottom plate and sidewall. A wedge-shaped groove, wherein the wedge-shaped groove is formed on the lining and located on the through crack; Reinforcing bars are provided within the wedge-shaped groove; High-strength pre-shrinkable mortar is filled into the wedge-shaped groove.

2. The repair structure for through-type cracks in underground karst landform water diversion tunnels according to claim 1, characterized in that, The size of the wedge-shaped groove is adapted to the size of the through crack in the lining.

3. The underground karst landform water diversion tunnel through-type crack repair structure according to claim 2, characterized in that, The high-strength pre-shrink mortar is smoothly connected to the bottom plate of the lining and the side wall.

4. The underground karst landform water diversion tunnel through-type crack repair structure according to claim 3, characterized in that, The wedge-shaped groove is coated with a new and old concrete interface agent.

5. The repair structure for through-type cracks in underground karst landform water diversion tunnels according to claim 4, characterized in that, The high-strength pre-shrink mortar is filled in layers within the wedge-shaped groove.

6. The repair structure for through-type cracks in underground karst landform water diversion tunnels according to claim 5, characterized in that, The lining is provided with a double layer of steel bars, and the reinforcing steel bars are welded to the double layer of steel bars to increase the connection strength.

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