A system and method for repairing differential movement of a double-layer grouting uplift cable tunnel

Abstract

The application discloses a kind of tunnel repair and geotechnical engineering technical field's double-layer grouting lifting cable tunnel differential dislocation repair system and method, to solve the problem that cable tunnel is prone to settlement after being built in prior art, cause dislocation, leakage and other problems at tunnel connection, its cable tunnel bottom surface is equipped with multiple rows of drill holes, drill hole extends from cable tunnel ground to underground pile foundation, and it is used for inserting expansion material delivery pipe and rapid-setting material delivery pipe;Rapid-setting material delivery pipe is used to transport cement rapid-setting material, and the end thereof is directionally provided with liquid outlet, and expansion material delivery pipe is used to transport water-resistant expansion material, and the end thereof is provided with horizontal section, and the horizontal section is provided with liquid outlet.The application is improved by using double-layer grouting mode, combined with the existing structure of cable tunnel foundation, cement rapid-setting material and underground pile foundation are combined to form fixed body, and expansion material lifts tunnel settlement section, to meet the repair technical requirements.

Description

Technical Field

[0001] This invention relates to a repair system and method for differential misalignment of cable tunnels using double-layer grouting, belonging to the field of tunnel repair and geotechnical engineering technology. Background Technology

[0002] Cable tunnels are concealed engineering projects. Due to complex and variable geological conditions, cable tunnels often encounter adverse geological environments such as soft soil layers during construction. If not handled properly, cable tunnels are prone to settlement after completion, causing problems such as misalignment and leakage at tunnel joints, and even seriously affecting large-scale power outages, leading to inconvenience to residents' lives and industrial production. Currently, polymer grouting methods are available for repair, but they have the following problems: polymer expansion is non-directional, resulting in extremely low tunnel lifting effect, which cannot meet the needs of actual engineering projects, and a large amount of material is required for lifting pipes or tunnel repair. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a repair system and method for differential displacement of cable tunnels by double-layer grouting. The system improves upon the existing cable tunnel structure by combining the existing structural foundation, cement quick-setting material and underground pile foundation to form a fixed body, and the expansion material raises the tunnel settlement segment to meet the repair technical requirements.

[0004] To achieve the above objectives, the present invention is implemented using the following technical solution: In a first aspect, the present invention provides a repair system for differential displacement of cable tunnels by double-layer grouting, comprising a cable tunnel and an underground pile foundation, wherein the cable tunnel is located on the underground pile foundation, characterized in that the bottom surface of the cable tunnel is provided with multiple rows of boreholes, the boreholes extending from the bottom surface of the cable tunnel into the underground pile foundation, which are used to insert delivery pipes, the delivery pipes being divided into expansion material delivery pipes and quick-setting material delivery pipes; The depth of the drilled hole used to insert the quick-setting material conveying pipe decreases from the middle to both sides. The quick-setting material conveying pipe is used to convey cement quick-setting material, and its ends are all oriented with liquid outlets. The depth of the drilled end for inserting the expansion material conveying pipe is on the same horizontal plane and is not greater than the minimum depth of the drilled end for inserting the quick-setting material conveying pipe. The expansion material conveying pipe is used to convey water-resistant expansion material, and its end is provided with a horizontal section, and the horizontal section is provided with a liquid outlet.

[0005] Optionally, the expansion material conveying pipe and the quick-setting material conveying pipe are arranged alternately, and the ratio of the interval between the boreholes to the cross-sectional span of the cable tunnel is in the range of 6~8:1.

[0006] Optionally, if the drilling depth of the expansion material delivery pipe located in the middle is h, then the drilling depth of the expansion material delivery pipes on both sides decreases by 0.05h.

[0007] Optionally, the diameter of both the expansion material conveying pipe and the quick-setting material conveying pipe is 100 mm.

[0008] Secondly, the present invention provides a method for repairing differential misalignment in cable tunnels by double-layer grouting, comprising: Determine the locations of the expansion material conveying pipes and the quick-setting material conveying pipes; Intelligent grouting equipment is used to inject quick-setting cement material through a quick-setting material delivery pipe, and the quick-setting cement material solidifies to form an arc-shaped cement-based connecting band. Intelligent grouting equipment is used to inject water-resistant expanding material through an expanding material delivery pipe. The water-resistant expanding material spontaneously expands in all directions and upwards between the underground pile foundations, lifting the settled cable tunnel segments.

[0009] Furthermore, the locations for laying out the expansion material delivery pipes and the quick-setting material delivery pipes include: Determine the drilling locations and mark them on the bottom of the cable tunnel; Using a drilling machine, a hole is drilled vertically downwards along a determined drilling position to obtain a hole for inserting a quick-setting material delivery pipe. Using a drilling machine, drill vertically downwards along the determined drilling position. After reaching the end of the drilling, use a 90° turner to turn the drill bit to the horizontal direction and drill a horizontal section to obtain a hole for inserting the expansion material delivery pipe. An expansion material delivery pipe and a quick-setting material delivery pipe are respectively inserted into the borehole.

[0010] Furthermore, the drilling locations are arranged along the longitudinal and transverse directions of the bottom surface of the cable tunnel, with the drilling holes for inserting the quick-setting material conveying pipe and the drilling holes for inserting the expansion material conveying pipe spaced apart.

[0011] Furthermore, during the grouting process, the grouting pressure and volume are monitored in real time using a sensor network and a data processing unit to control the grouting speed.

[0012] Furthermore, the grouting thickness of the cement quick-setting material ranges from 0.2 to 0.6 m; the injection volume of the expansion material conveying pipe decreases by 5% from the middle to both sides.

[0013] Furthermore, the injection volume of the expansion material delivery pipe located in the middle is determined by the geology below the cable tunnel and the expansion force and rate of the water-resistant expansion material.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: This invention delivers quick-setting cement material through a quick-setting material delivery pipe to the underground pile foundation to form an arc-shaped cement-based connecting band. This unique "bowl-bottom" joint structure can effectively resist the downward force after the expansion of the upper expansion material, enhancing the stability of the overall structure. Then, expansion material is delivered through an expansion material delivery pipe to the top of the arc-shaped cement-based connecting band. Due to the obstruction of the arc-shaped cement-based connecting band, the expansion material spontaneously expands in all directions and upwards, lifting the settled cable tunnel segments and solving the problem of differential displacement of the cable tunnel. The overall stability of the structure is effectively enhanced. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a double-layer grouting lifting cable tunnel differential misalignment repair system in one embodiment of the present invention; Figure 2 This is a schematic diagram of the layout of the quick-setting material delivery pipe in a method for repairing differential misalignment in a double-layer grouting lifting cable tunnel according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the layout of the expansion material delivery pipe in a method for repairing differential misalignment in a double-layer grouting lifting cable tunnel according to an embodiment of the present invention. In the diagram: 1. Cable tunnel, 2. Left compartment, 3. Right compartment, 4. Tunnel sidewall, 5. Pedestrian walkway, 6. Water-resistant expansion material, 7. Cement quick-setting material, 8. Expansion material conveying pipe, 9. Quick-setting material conveying pipe, 10. Underground pile foundation. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention. Example 1

[0017] like Figure 1 As shown, the cable tunnel 1 is located on the underground pile foundation 10. The cable tunnel 1 includes a left compartment 2, a right compartment 3, a tunnel side wall 4, and a pedestrian walkway 5. The tunnel side wall 4 and the pedestrian walkway 5 are made of C40 and C20 concrete, respectively. A pedestrian walkway 5 is provided in the left compartment 2 and the right compartment 3, thus forming a closed space.

[0018] The double-layer grouting system for repairing differential misalignment in cable tunnels provided in this embodiment of the invention includes boreholes arranged in multiple rows, both laterally and longitudinally, on the bottom surface of the cable tunnel 1 and extending from the bottom surface of the cable tunnel 1 into the underground pile foundation 10. The ratio of the interval between boreholes to the cross-sectional span of the cable tunnel 1 ranges from 6 to 8:1, and in this embodiment, it is 7:1. The boreholes are used to insert delivery pipes. Since the diameter of the delivery pipe is 100 mm, the diameter of the boreholes must be slightly larger than 100 mm.

[0019] The conveying pipe is divided into an expansion material conveying pipe 8 and a quick-setting material conveying pipe 9. The expansion material conveying pipe 8 is used to convey water-resistant expansion material 6. At the end of the quick-setting material conveying pipe 9, there are directional liquid outlets. The quick-setting material conveying pipe 9 is used to convey cement quick-setting material 7. At the end of the expansion material conveying pipe 8, there is a horizontal section with a liquid outlet to ensure that the grouting of the conveying pipe is comprehensive and uniform.

[0020] like Figures 2-3 As shown, the expansion material delivery pipe 8 and the quick-setting material delivery pipe 9 are inserted alternately into the borehole. The depth of the borehole end for inserting the quick-setting material delivery pipe 9 decreases from the middle to both sides. Specifically, if the depth of the borehole for inserting the quick-setting material delivery pipe 9 in the middle is h, then the depth of the borehole for inserting the quick-setting material delivery pipe 9 on both sides decreases by 0.05h. The depth of the borehole end for inserting the expansion material delivery pipe 8 is on the same horizontal plane, and the depth is not greater than the minimum depth of the borehole for inserting the quick-setting material delivery pipe 9. Example 2

[0021] Based on Example 1, this example provides a method for repairing differential misalignment in cable tunnels with double-layer grouting, including the following steps: First, the locations of the expansion material conveying pipe 8 and the quick-setting material conveying pipe 9 are laid out, specifically: Determine the drilling locations, which are laid out along the longitudinal and transverse directions of cable tunnel 1. Mark the drilling locations at the bottom of cable tunnel 1.

[0022] Using a professional drilling machine, drill vertically downwards along the marked drilling position. The drilling depth should be slightly greater than the length of the delivery pipe to be inserted. If the material delivery pipe 8 is to be inserted, after drilling to the required depth in the vertical direction, the end of the drilling is reached. Use a 90° turner or bend tool to turn the drill bit to the horizontal direction and continue drilling in the horizontal direction to form a horizontal section.

[0023] Next, intelligent grouting equipment is used to grout the quick-setting material delivery pipe 9 with cement quick-setting material 7. Cement quick-setting material 7 has high strength and good toughness, can evenly distribute grouting pressure, and reduce damage to the tunnel structure. After the cement-based material is mixed, it is quickly fed into the quick-setting material delivery pipe 9 for grouting.

[0024] The grouting thickness of the cement quick-setting material 7 ranges from 0.2 to 0.6 m. Since the outlets of the quick-setting material conveying pipe 9 are all directional, the cement quick-setting material 7 will connect and interlock with the underground pile foundation 10 during the discharge process, forming an arc-shaped cement-based connecting band from points. This unique "bowl bottom" joint structure can effectively resist the downward force after the expansion of the upper expansion material, thus enhancing the stability of the overall structure.

[0025] After the cement quick-setting material has set for 6 to 24 hours, water-resistant expansive material 6 with controllable expansion force is injected into the expansive material conveying pipe 8. The injection volume of all expansive material conveying pipes 8 decreases by 5% from the middle to both sides. The injection volume of the expansive material conveying pipe 8 located in the middle is determined by factors such as the geological conditions below the cable tunnel 1 and the expansion force and rate of the water-resistant expansive material 6.

[0026] The water-swellable material 6 expands spontaneously between the underground pile foundations 10. Due to the obstruction of the arc-shaped cement-based connecting band at its bottom, the water-swellable material 6 will only expand in all directions and upwards, lifting the settled cable tunnel 1 segment and solving the problem of differential displacement of cable tunnel 1.

[0027] During the grouting process, a sensor network and data processing unit can monitor grouting pressure and volume in real time, precisely control grouting speed and location, and ensure a smooth and uniform lifting process. The material ratio can also be adjusted according to actual construction conditions to adapt to different geological and engineering requirements, thereby achieving the best lifting effect.

[0028] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A double-layer grouting system for repairing differential misalignment in cable tunnels, comprising a cable tunnel and an underground pile foundation, wherein the cable tunnel is situated on the underground pile foundation, characterized in that, The bottom surface of the cable tunnel is provided with multiple rows of boreholes, which extend from the bottom surface of the cable tunnel into the underground pile foundation. These boreholes are used to insert delivery pipes, which are divided into expansion material delivery pipes and quick-setting material delivery pipes. The depth of the drilled end of the quick-setting material conveying pipe decreases from the middle to both sides. The quick-setting material conveying pipe is used to convey cement quick-setting material. Each end of the pipe is oriented with a liquid outlet. The cement quick-setting material solidifies to form an arc-shaped cement-based connecting band. The depth of the borehole end used for inserting the expansion material conveying pipe is on the same horizontal plane and is not greater than the minimum depth of the borehole end used for inserting the quick-setting material conveying pipe. The expansion material conveying pipe is used to convey water-resistant expansion material, and its end is provided with a horizontal section. The horizontal section is provided with a liquid outlet. The water-resistant expansion material spontaneously expands in all directions and upwards between the underground pile foundations, lifting the settled cable tunnel segments.

2. The double-layer grouting lifting cable tunnel differential misalignment repair system according to claim 1, characterized in that, The expansion material conveying pipe and the quick-setting material conveying pipe are arranged alternately, and the ratio of the interval between the boreholes to the cross-sectional span of the cable tunnel is 6 to 8:

1.

3. The double-layer grouting lifting cable tunnel differential misalignment repair system according to claim 1, characterized in that, Let h be the drilling depth of the pipe for inserting the quick-setting material in the middle. Then the drilling depth of the pipes for inserting the quick-setting material on both sides decreases by 0.05h.

4. The double-layer grouting lifting cable tunnel differential misalignment repair system according to claim 1, characterized in that, The diameter of both the expansion material conveying pipe and the quick-setting material conveying pipe is 100 mm.

5. A method for repairing differential misalignment in cable tunnels using double-layer grouting, characterized in that, This is achieved through the double-layer grouting lifting cable tunnel differential misalignment repair system as described in any one of claims 1 to 4, comprising: Lay out expansion material conveying pipes and quick-setting material conveying pipes; Intelligent grouting equipment is used to grout cement quick-setting materials through quick-setting material delivery pipes; Intelligent grouting equipment is used to grout water-resistant expansion material through an expansion material delivery pipe.

6. The repair method for differential misalignment in cable tunnels by double-layer grouting as described in claim 5, characterized in that, Laying out expansion material conveying pipes and quick-setting material conveying pipes includes: Determine the drilling locations and mark them on the bottom of the cable tunnel; Using a drilling machine, a hole is drilled vertically downwards along a determined drilling position to obtain a hole for inserting a quick-setting material delivery pipe. Using a drilling machine, drill vertically downwards along the determined drilling position. After reaching the end of the drilling, use a 90° turner to turn the drill bit to the horizontal direction and drill a horizontal section to obtain a hole for inserting the expansion material delivery pipe. An expansion material delivery pipe and a quick-setting material delivery pipe are respectively inserted into the borehole.

7. The repair method for differential misalignment in cable tunnels by double-layer grouting as described in claim 6, characterized in that, The drilling locations are arranged along the longitudinal and transverse directions of the bottom surface of the cable tunnel, with the drilling holes for inserting the quick-setting material conveying pipe and the drilling holes for inserting the expansion material conveying pipe spaced apart.

8. The method for repairing differential misalignment in cable tunnels by double-layer grouting as described in claim 5, characterized in that, During the grouting process, the grouting pressure and volume are monitored in real time by combining a sensor network and a data processing unit to control the grouting speed.

9. The method for repairing differential misalignment in cable tunnels by double-layer grouting as described in claim 5, characterized in that, The grouting thickness of the cement quick-setting material ranges from 0.2 to 0.6 m; the injection volume of the expansion material conveying pipe decreases by 5% from the middle to both sides.

10. The method for repairing differential misalignment in cable tunnels by double-layer grouting as described in claim 9, characterized in that, The injection volume of the expansion material delivery pipe located in the middle is determined by the geology below the cable tunnel and the expansion force and rate of the water-resistant expansion material.

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