Radial grouting structure of underwater double tunnel

Abstract

The utility model relates to the field of submarine tunnel grouting reinforcement, especially relate to a radial grouting structure of underwater double tunnel, including the tunnel of following, the lateral wall of tunnel of following is equipped with first grouting area and second grouting area, first grouting area is located the top of second grouting area, first grouting area is set up several first grouting channels, second grouting area is set up several second grouting channels, and first grouting channel and second grouting channel are perpendicular to the axis of tunnel of following respectively, along the height direction of tunnel of following, several first grouting channels are interval arrangement, and several second grouting channels are interval arrangement, first grouting channel is located the top of tunnel of preceding, and the end of second grouting channel is interval arrangement with the lateral wall of tunnel of preceding, when the construction of tunnel of following enters the soft surrounding rock area, through first grouting channel and second grouting channel, the surrounding rock is grouted and reinforced, the surrounding rock of tunnel of preceding is reinforced while guaranteeing the structural stability of tunnel of following, guarantees tunnel of preceding safety.

Description

Technical Field

[0001] This utility model relates to the field of grouting reinforcement of submarine tunnels, and in particular to a radial grouting structure for underwater double tunnels. Background Technology

[0002] During tunnel construction, grouting is necessary to reinforce the surrounding rock to ensure structural stability after excavation. The specific construction involves two scenarios: 1. During tunnel excavation, workers drill grouting holes at a certain angle around the tunnel face in stages along the tunnel's direction. Grout is injected into the surrounding rock through these holes to ensure it remains reinforced throughout the excavation process, thus guaranteeing construction safety and structural stability. 2. After tunnel excavation, targeted grouting can be used to reinforce weak surrounding rock areas on the sides. For underwater twin-tunnel construction, because the two tunnels are close together and parallel, simultaneous construction would affect stability and safety. Therefore, the first tunnel must be completed before the second tunnel can be constructed.

[0003] However, when excavating a new tunnel next to an existing underwater tunnel, the existing underwater tunnel, as the first tunnel, poses significant risks: the subsequent tunnel is prone to water leakage when it reaches areas with weak surrounding rock, and the surrounding rock structure of the first tunnel located in this area has already been damaged, so the first tunnel also has the risk of water leakage; if only the leakage points of the subsequent tunnel are sealed by targeted grouting, the protection effect on the first tunnel is poor. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies where, when a secondary tunnel is excavated next to an existing underwater tunnel, the secondary tunnel may leak when the construction reaches a weak surrounding rock area due to damage to the surrounding rock structure. This invention provides a radial grouting structure for underwater double tunnels.

[0005] This utility model provides a radial grouting structure for underwater double tunnels, comprising: The rear tunnel has a first grouting area and a second grouting area on its sidewall, with the first grouting area located above the second grouting area. The first grouting area has a plurality of first grouting channels, and the second grouting area has a plurality of second grouting channels. The first grouting channels and the second grouting channels are perpendicular to the axis of the subsequent tunnel. Along the height direction of the rear tunnel, a plurality of first grouting channels are spaced apart, and a plurality of second grouting channels are spaced apart; The first grouting channel is located above the pilot tunnel, and the end of the second grouting channel is spaced apart from the sidewall of the pilot tunnel.

[0006] Preferably, along the axial direction of the rear tunnel, a plurality of first grouting channels are arranged at intervals, and a plurality of second grouting channels are arranged at intervals.

[0007] Preferably, the second grouting channel is horizontally arranged, while the first grouting channel is inclined.

[0008] Preferably, the first grouting channel has an angle A with the horizontal plane, wherein the angle A is greater than 0 degrees and less than 60 degrees.

[0009] Preferably, the grouting ports of the first grouting channel are all located on the sidewall of the subsequent tunnel.

[0010] Preferably, the diameter of the grouting channel is 3 to 5 centimeters.

[0011] Preferably, the projection of the first grouting channel on the horizontal plane covers the projection of the preceding tunnel on the horizontal plane.

[0012] Preferably, the first grouting channel and the second grouting channel are each provided with a grouting pipe, and the first grouting channel is adapted to be connected to the grouting pipe; the second grouting channel is adapted to be connected to the grouting pipe.

[0013] Preferably, the end of the grouting pipe extends at least 10 cm beyond the sidewall of the subsequent tunnel.

[0014] Preferably, the grouting pipe is equipped with a valve, which is detachably connected to the end of the grouting pipe, and the valve is used to connect grouting equipment.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model provides a radial grouting structure for underwater double tunnels. When the construction of the subsequent tunnel enters a weak surrounding rock area, the surrounding rock is reinforced by grouting through the first grouting channel and the second grouting channel. While ensuring the structural stability of the subsequent tunnel, the surrounding rock of the preceding tunnel is reinforced. This avoids the need for grouting and water plugging construction in the preceding tunnel if water seepage occurs due to the construction of the subsequent tunnel, thus ensuring the safety of the preceding tunnel.

[0016] 2. This utility model provides a radial grouting structure for underwater twin tunnels. A first grouting channel reinforces the surrounding rock above the preceding tunnel, while a second grouting channel reinforces the surrounding rock on the side of the preceding tunnel. This strengthens the surrounding rock structure of the preceding tunnel, located in a weak rock area, reducing the impact of subsequent tunnel construction on the stability of the preceding tunnel structure. The first and second grouting channels are perpendicular to the axis of the subsequent tunnel, enabling better reinforcement of the surrounding rock of the preceding tunnel. This reduces the amount of construction work and has good economic and practical value. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the radial grouting structure of an underwater double tunnel according to the present invention; Figure 2 This is a schematic diagram of the rear tunnel cross-section of a radial grouting structure for an underwater double tunnel according to the present invention. Figure 3 This is a partial structural schematic diagram of the longitudinal section of the rear tunnel of a radial grouting structure for an underwater double tunnel according to the present invention. Figure 4 This is a schematic diagram of the grouting pipe of a radial grouting structure for an underwater double tunnel according to this utility model.

[0018] Marked in the image: 1-Preliminary tunnel, 2-Subsequent tunnel, 3-First grouting channel, 4-Second grouting channel, 5-First grouting area, 6-Second grouting area, 7-Grouting pipe, 8-Valve. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments. All technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0020] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer" used in the description of specific embodiments of this utility model to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0022] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0023] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0024] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0025] Example 1 like Figures 1-4As shown, a radial grouting structure for an underwater double tunnel includes a rear tunnel 2. The sidewall of the rear tunnel 2 is provided with a first grouting area 5 and a second grouting area 6. The first grouting area 5 is located above the second grouting area 6. The first grouting area 5 has a plurality of first grouting channels 3, and the second grouting area 6 has a plurality of second grouting channels 4. The first grouting channels 3 and the second grouting channels 4 are perpendicular to the axis of the rear tunnel 2. Along the height direction of the rear tunnel 2, the plurality of first grouting channels 3 are spaced apart, and the plurality of second grouting channels 4 are spaced apart. The first grouting channels 3 are located above the first tunnel 1, and the ends of the second grouting channels 4 are spaced apart from the sidewall of the first tunnel 1. The first grouting channels 3 and the second grouting channels 4 are both located on the side of the rear tunnel 2 closer to the first tunnel 1.

[0026] When the construction of the subsequent tunnel 2 enters the area of ​​weak surrounding rock, the surrounding rock is reinforced by grouting through the first grouting channel 3 and the second grouting channel 4. This ensures the structural stability of the subsequent tunnel 2 while reinforcing the surrounding rock of the preceding tunnel 1, avoiding the need for grouting and water plugging in the preceding tunnel 1 if water seepage occurs due to the construction of the subsequent tunnel 2. The first grouting channel 3 reinforces the surrounding rock above the preceding tunnel 1, and the second grouting channel 4 reinforces the surrounding rock on the side of the preceding tunnel 1. This strengthens the surrounding rock structure of the preceding tunnel 1, which is located in the weak surrounding rock area, reducing the impact of the construction of the subsequent tunnel 2 on the structural stability of the preceding tunnel 1. The first grouting channel 3 and the second grouting channel 4 are perpendicular to the axis of the subsequent tunnel 2, which can better reinforce the surrounding rock of the preceding tunnel 1 and reduce the amount of construction work.

[0027] Specifically, if water seepage occurs in the subsequent tunnel 2 when it is excavated into a weak surrounding rock area, it indicates that the corresponding preceding tunnel 1 also has a risk of water seepage. Therefore, while grouting and sealing the subsequent tunnel 2, grouting and reinforcement of the preceding tunnel 1 should be carried out simultaneously. This can effectively ensure the structural stability of the preceding tunnel 1 and reduce its risk of water seepage.

[0028] In one or more embodiments, along the axial direction of the subsequent tunnel 2, a plurality of first grouting channels 3 are arranged at intervals, and a plurality of second grouting channels 4 are arranged at intervals; construction personnel can arrange a plurality of first grouting channels 3 and a plurality of second grouting channels 4 along the axial direction of the subsequent tunnel 2, and determine the number of first grouting channels 3 and second grouting channels 4 according to the size of the area of ​​the subsequent tunnel 2 that needs to be grouted and sealed.

[0029] In one or more embodiments, the second grouting channel 4 is horizontally arranged, the first grouting channel 3 is inclined, and the second grouting channel 4 is horizontally arranged. The second grouting channel 4 is horizontally arranged, and the end of the second grouting channel 4 is at least 1m away from the secondary lining sidewall of the preceding tunnel 1 to avoid damage to the structure of the preceding tunnel 1. The first grouting channel 3 is inclined, which can avoid damaging the arch of the following tunnel 2 and reduce its grouting port height in the following tunnel, thereby facilitating the grouting operation by the workers.

[0030] In an optional embodiment, the first grouting channel 3 has an angle A with the horizontal plane, the angle A being greater than 0 degrees and less than 60 degrees, so that the first grouting channel 3 is inclined and located above the pilot tunnel 1. Specifically, the angle A is 30 degrees.

[0031] In one or more embodiments, the grouting ports of the first grouting channel 3 are all located on the sidewall of the subsequent tunnel 2, which is convenient for operators to carry out operations; since the first grouting channel 3 is located above the second grouting channel 4, the grouting ports of the second grouting channel 4 are also located on the sidewall of the subsequent tunnel 2; for the tunnel, the arc-shaped core part at the top of the tunnel is the arch, the vertical or slightly arc-shaped walls on both sides of the tunnel are the sidewalls, and the transition arc-shaped section between the tunnel arch and the sidewalls is the arch waist.

[0032] In one or more embodiments, the diameter of the grouting channel is 3 to 5 centimeters.

[0033] In one or more embodiments, the projection of the first grouting channel 3 on the horizontal plane covers the projection of the preceding tunnel 1 on the horizontal plane, so that the grouting area of ​​the first grouting channel 3 covers the surrounding rock above the preceding tunnel 1, thereby reinforcing the preceding tunnel 1.

[0034] In one or more embodiments, the first grouting channel 3 and the second grouting channel 4 are respectively provided with grouting pipes 7. The first grouting channel 3 is adapted to be connected with the grouting pipe 7; the second grouting channel 4 is adapted to be connected with the grouting pipe 7. This connection method can seal the gap between the grouting channel and the grouting pipe 7 to avoid grout leakage. Finally, cement grout is injected into the surrounding rock through the grouting pipe 7 to achieve the reinforcement of the surrounding rock.

[0035] In an optional embodiment, the end of the grouting pipe 7 extends at least 10 cm beyond the sidewall of the rear tunnel 2, and a thread is provided at the end of the grouting pipe 7 to connect to the grouting equipment.

[0036] In an optional embodiment, the grouting pipe 7 is provided with a valve 8, which is detachably connected to the end of the grouting pipe 7. The valve 8 is used to connect the grouting equipment. The valve 8 is a ball valve and is adapted to a threaded connection. During the grouting operation, the valve 8 is opened and closed after the grouting is completed.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A radial grouting structure for underwater double tunnels, characterized in that, include: The rear tunnel (2) has a first grouting area (5) and a second grouting area (6) on its sidewall, with the first grouting area (5) located above the second grouting area (6). The first grouting area (5) has a plurality of first grouting channels (3), and the second grouting area (6) has a plurality of second grouting channels (4). The first grouting channels (3) and the second grouting channels (4) are perpendicular to the axis of the rear tunnel (2). Along the height direction of the rear tunnel (2), a plurality of first grouting channels (3) are arranged at intervals, and a plurality of second grouting channels (4) are arranged at intervals; The first grouting channel (3) is located above the pilot tunnel (1), and the end of the second grouting channel (4) is spaced apart from the side wall of the pilot tunnel (1).

2. The radial grouting structure for an underwater double tunnel according to claim 1, characterized in that, Along the axial direction of the rear tunnel (2), a plurality of first grouting channels (3) are arranged at intervals, and a plurality of second grouting channels (4) are arranged at intervals.

3. The radial grouting structure for an underwater double tunnel according to claim 1, characterized in that, The second grouting channel (4) is set horizontally, and the first grouting channel (3) is set at an angle.

4. The radial grouting structure for an underwater double tunnel according to claim 3, characterized in that, The first grouting channel (3) has an angle A with the horizontal plane, the angle A being greater than 0 degrees and less than 60 degrees.

5. The radial grouting structure for an underwater double tunnel according to claim 1, characterized in that, The grouting ports of the first grouting channel (3) are all located on the sidewall of the rear tunnel (2).

6. The radial grouting structure for an underwater double tunnel according to claim 1, characterized in that, The diameter of the grouting channel is 3 to 5 centimeters.

7. The radial grouting structure for an underwater double tunnel according to claim 1, characterized in that, The projection of the first grouting channel (3) on the horizontal plane covers the projection of the preceding tunnel (1) on the horizontal plane.

8. A radial grouting structure for an underwater double tunnel according to any one of claims 1-7, characterized in that, The first grouting channel (3) and the second grouting channel (4) are respectively provided with grouting pipes (7). The first grouting channel (3) is adapted to be connected to the grouting pipe (7); the second grouting channel (4) is adapted to be connected to the grouting pipe (7).

9. The radial grouting structure for an underwater double tunnel according to claim 8, characterized in that, The end of the grouting pipe (7) extends at least 10 cm beyond the sidewall of the subsequent tunnel (2).

10. The radial grouting structure for an underwater double tunnel according to claim 9, characterized in that, The grouting pipe (7) is equipped with a valve (8), which is detachably connected to the end of the grouting pipe (7). The valve (8) is used to connect the grouting equipment.

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