Control structure for excavation springback of channel soil body above shallow-buried tunnel
By setting up flexible and rigid reinforcement areas above the shallow buried tunnel, filling them with sand, gravel and concrete piles, and injecting cement slurry, the problem of soil rebound deformation caused by excavation of channels above the shallow buried tunnel is solved, and effective protection and safety guarantee of the tunnel structure is achieved.
Patent Information
- Application Number
- CN202421810240.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-07-30
AI Technical Summary
Excavation of the above channels above shallow buried tunnels causes the soil to rebound and deform, affecting the safety of the tunnel structure. It is difficult for the existing technology to effectively control soil rebound.
A proposed channel is set up above the current tunnel, and a flexible reinforcement area and a rigid reinforcement area are set up in the soil between the proposed channel and the current tunnel, multiple occlusion pile holes are set up, sand and gravel piles are filled in the flexible reinforcement area, concrete piles are filled in the rigid reinforcement area, and cement slurry is injected into the gap between the occlusion pile holes.
Significantly increase the overall rebound modulus of the soil, reduce the rebound modulus of the soil, ensure the safety of the tunnel structure, simple structure, convenient construction, and controllable costs.
Smart Images
Figure CN222810801U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of underground engineering construction, in particular to a control structure for excavation rebound of soil in a channel above a shallow buried tunnel. Background Art
[0002] With the continuous development of urban underground space, the construction of subway tunnels is increasing, and the tunnel network is becoming more and more dense. New urban channel projects inevitably need to cross existing subway tunnels. When the tunnel is shallow, channel excavation and soil unloading will cause the soil above the tunnel to rebound and deform, which will in turn cause the tunnel structure to deform and even affect the operational safety of the tunnel. In this regard, reinforced concrete rafts and pull-out piles can be set up when excavating to the designed bottom surface to suppress soil rebound, but the soil rebound deformation cannot be controlled during the channel excavation stage; or the MJS rotary jet pile method can be used to directly reinforce the soil above the tunnel with cement soil, but the rebound modulus of cement soil does not increase much compared to the original soil, and a certain amount of rebound deformation will still occur during the excavation of permanent channels. Summary of the invention
[0003] The technical problem to be solved by the utility model is to provide a control structure for the excavation rebound of soil in a channel above a shallow buried tunnel in view of the deficiencies of the above-mentioned prior art.
[0004] The utility model provides a technical solution for solving the above-mentioned technical problems as follows: a control structure for the rebound of soil excavation in a channel above a shallow tunnel, comprising a proposed channel arranged above an existing tunnel, a flexible reinforcement zone and a rigid reinforcement zone respectively arranged in the soil between the proposed channel and the existing tunnel, a plurality of interlocking pile holes respectively arranged in the flexible reinforcement zone and the rigid reinforcement zone, a gravel pile body arranged in the interlocking pile hole corresponding to the flexible reinforcement zone, a concrete pile body arranged in the interlocking pile hole corresponding to the rigid reinforcement zone, grouting holes arranged in the gaps between the interlocking pile holes, cement slurry injected into the grouting holes.
[0005] The beneficial effects of the utility model are as follows: the control structure for the rebound of soil excavation in the channel above the shallow buried tunnel of the utility model greatly increases the overall rebound modulus of the soil by respectively arranging bite pile holes in the flexible reinforcement area and the rigid reinforcement area in the soil between the proposed channel and the existing tunnel, and arranging gravel piles and concrete piles in the bite pile holes for pre-reinforcement, and can reduce the soil rebound amount when the soil is permanently unloaded above the tunnel, thereby ensuring the safety of the tunnel structure, with a simple structure, convenient construction and controllable costs.
[0006] On the basis of the above technical solution, the present invention can also be improved as follows:
[0007] Further: the flexible reinforcement area is located above the rigid reinforcement area, and the flexible reinforcement area is located below the channel slopes on both sides of the proposed channel and above the channel bottom elevation of the proposed channel, and the rigid reinforcement area is located below the channel bottom elevation of the proposed channel.
[0008] The beneficial effect of the above further scheme is: by setting the flexible reinforcement area below the channel slopes on both sides of the proposed channel and above the channel bottom elevation of the proposed channel, and setting the rigid reinforcement area below the channel bottom elevation of the proposed channel, the soil in the area where the deformation of the existing tunnel is greatly affected by the channel excavation can be reinforced.
[0009] Further: the flexible reinforcement area and the rigid reinforcement area are both located within the excavation surface of the proposed channel.
[0010] The beneficial effect of the above further scheme is: by setting the flexible reinforcement area and the rigid reinforcement area within the excavation surface of the proposed channel, the reinforcement area can be appropriately expanded to ensure that the channel slope of the proposed channel is effectively supported, thereby ensuring the safety of the existing tunnel.
[0011] Further: the extension length of the flexible reinforcement area and the rigid reinforcement area on both sides of the existing tunnel is not less than the outer diameter of the existing tunnel.
[0012] The beneficial effect of the above further solution is that by extending the flexible reinforcement area and the rigid reinforcement area on both sides of the existing tunnel, it can be ensured that the entire flexible reinforcement area and the rigid reinforcement area play a better protective role on the existing tunnel.
[0013] Further: the net distance S between the bottom of the rigid reinforcement zone and the top of the existing tunnel is not less than 2m, and the thickness H of the rigid reinforcement zone is not less than the excavation depth of the proposed channel.
[0014] The beneficial effect of the above further scheme is: by controlling the clear distance between the bottom of the rigid reinforcement zone and the top of the existing tunnel, the impact on the structure of the existing tunnel during the construction process can be avoided. The thickness requirement of the rigid reinforcement zone is intended to meet the requirement of controlling the rebound of the soil above the existing tunnel.
[0015] Further: the interlocking pile holes corresponding to the flexible reinforcement area are filled with graded gravel to form a gravel pile body, and the interlocking pile holes corresponding to the rigid reinforcement area are filled with plain concrete to form the concrete pile body.
[0016] The beneficial effects of the above further scheme are: by setting the interlocking pile holes, the pile body can fit tightly and the reinforcement effect is better. The flexible reinforcement area is backfilled with graded sand and gravel to save costs on the one hand and facilitate channel excavation on the other hand. The rigid reinforcement area is backfilled with plain concrete to ensure the reinforcement strength.
[0017] Further: the engagement width of the engagement pile hole is not less than 0.2m.
[0018] The beneficial effect of the above further solution is that the construction quality can be guaranteed by controlling the bite width. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 A schematic cross-sectional view of a snap pile structure of a control structure for soil excavation rebound above a shallow buried tunnel according to an embodiment of the utility model;
[0020] Figure 2 It is a cross-sectional schematic diagram of a control structure for excavation rebound of soil in a channel above a shallow buried tunnel according to an embodiment of the utility model after the channel construction is completed;
[0021] Figure 3 It is a plan view of a snap pile structure of a control structure for soil excavation rebound above a shallow buried tunnel according to an embodiment of the utility model;
[0022] Figure 4 A schematic diagram of the interlocking pile filling structure of a control structure for excavation rebound of soil in a channel above a shallow buried tunnel according to an embodiment of the utility model;
[0023] Figure 5 It is a schematic diagram of interlocking pile void grouting of a control structure for excavation rebound of soil in a channel above a shallow buried tunnel according to an embodiment of the utility model.
[0024] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0025] 1. Existing tunnel, 2. Proposed channel, 2-1. Channel bottom, 2-2. Channel slope, 3. Ground line, 4. Flexible reinforcement area, 5. Rigid reinforcement area, 6. Interlocking pile hole, 7. Graded sand and gravel, 8. Plain concrete, 9. Grouting hole. DETAILED DESCRIPTION
[0026] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.
[0027] like Figures 1 to 5As shown, a control structure for the rebound of soil excavation in a channel above a shallow buried tunnel comprises a proposed channel 2 arranged above an existing tunnel 1, a flexible reinforcement area 4 and a rigid reinforcement area 5 are respectively arranged in the soil between the proposed channel 2 and the existing tunnel 1, a plurality of interlocking pile holes 6 are respectively arranged in the flexible reinforcement area 4 and the rigid reinforcement area 5, a gravel pile body is arranged in the interlocking pile hole 6 corresponding to the flexible reinforcement area 4, a concrete pile body is arranged in the interlocking pile hole 6 corresponding to the rigid reinforcement area 5, grouting holes 9 are arranged in the gaps between the interlocking pile holes 6, and cement slurry is injected into the grouting holes 9.
[0028] The utility model discloses a control structure for the rebound of soil excavation in a channel above a shallow buried tunnel. By respectively setting interlocking pile holes 6 in the flexible reinforcement area 4 and the rigid reinforcement area 5 in the soil between the proposed channel 2 and the existing tunnel 1, and setting gravel pile bodies and concrete pile bodies in the interlocking pile holes 6 for pre-reinforcement, the overall rebound modulus of the soil is greatly increased, and the soil rebound can be reduced in the case of permanent unloading of soil above the tunnel, thereby ensuring the safety of the tunnel structure. The utility model has a simple structure, is convenient to construct, and has controllable costs.
[0029] In one or more embodiments of the utility model, the flexible reinforcement area 4 is located above the rigid reinforcement area 5, and the flexible reinforcement area 4 is located below the channel slopes 2-2 on both sides of the proposed channel 2 and above the channel bottom elevation of the proposed channel 2, and the rigid reinforcement area 5 is located below the elevation of the channel bottom 2-1 of the proposed channel 2. By setting the flexible reinforcement area 4 below the channel slopes 2-2 on both sides of the proposed channel 2 and above the channel bottom elevation of the proposed channel 2, and setting the rigid reinforcement area 5 below the elevation of the channel bottom 2-1 of the proposed channel 2, the soil in the area where the excavation of the channel 2 has a greater impact on the deformation of the existing tunnel 1 can be reinforced.
[0030] Optionally, in one or more embodiments of the utility model, the flexible reinforcement area 4 and the rigid reinforcement area 5 are both located within the excavation surface of the proposed channel 2. By arranging the flexible reinforcement area 4 and the rigid reinforcement area 5 within the excavation surface of the proposed channel 2, the reinforcement area can be appropriately expanded to ensure that the channel slope 2-2 of the proposed channel 2 is effectively supported, thereby ensuring the safety of the existing tunnel 1.
[0031] In one or more embodiments of the utility model, the flexible reinforcement area 4 and the rigid reinforcement area 5 extend on both sides of the existing tunnel 1 by a length that is not less than the outer diameter of the existing tunnel 1. By extending the flexible reinforcement area 4 and the rigid reinforcement area 5 on both sides of the existing tunnel 1, it can be ensured that the entire flexible reinforcement area 4 and the rigid reinforcement area 5 play a better protective role on the existing tunnel 1.
[0032] In one or more embodiments of the present invention, the clear distance S between the bottom of the rigid reinforcement area 5 and the top of the existing tunnel 1 is not less than 2m, and the thickness H of the rigid reinforcement area 5 is not less than the excavation depth of the proposed channel 2. By controlling the clear distance between the bottom of the rigid reinforcement area 5 and the top of the existing tunnel 1, the structure of the existing tunnel 1 can be avoided from being affected during the construction process. The thickness requirement of the rigid reinforcement area 5 is intended to meet the requirement of controlling the rebound of the soil above the existing tunnel 1.
[0033] In one or more embodiments of the utility model, the interlocking pile hole 6 corresponding to the flexible reinforcement zone 4 is filled with graded gravel 7 to form a gravel pile body, and the interlocking pile hole 6 corresponding to the rigid reinforcement zone 5 is filled with plain concrete 8 to form the concrete pile body. By setting the interlocking pile hole 6, the pile body can be closely fitted, and the reinforcement effect is better. The flexible reinforcement zone 4 and the rigid reinforcement zone (5) are both formed by the filling material after the interlocking construction of the interlocking pile hole 6. The interlocking pile construction process can make the pile body closely fit, and the reinforcement effect is better. The flexible reinforcement zone 4 is backfilled with graded gravel 7 to save costs on the one hand and facilitate the excavation of the channel on the other hand. The rigid reinforcement zone 5 is backfilled with plain concrete 8 to ensure the reinforcement strength.
[0034] Optionally, in one or more embodiments of the present invention, the engagement width of the engagement pile hole 6 is not less than 0.2 m. By controlling the engagement width, the construction quality can be guaranteed.
[0035] Here, the interlocking pile hole 6 should adopt the full casing drilling rig construction process, add a retarder to the plain concrete 8 filled in the interlocking pile hole 6, cut and interlock before the initial setting of the concrete, and the interlocking width is not less than 0.2m. This process can cut the concrete, make the concrete pile body of the rigid reinforcement area interlock, and can better control the interlocking width to ensure the construction quality.
[0036] In practice, grouting holes 9 are provided in the spaces between the interlocking pile holes 6, and cement slurry is injected through a grouting pipe. The length of the grouting pipe is equal to the thickness of the reinforcement area below the channel excavation line, in order to ensure that the soil is fully reinforced.
[0037] The utility model is a control structure for the excavation and rebound of soil in the channel above the shallow buried tunnel. The specific construction includes the following steps:
[0038] ① Site leveling, positioning, and determining the scope of one times the diameter of the existing tunnel 1 and the boundary of channel 2;
[0039] ② Use a full casing drilling rig to construct the interlocking pile hole 6, fill the lower part of the interlocking pile hole 6 with plain concrete 8, and fill the upper part with graded sand and gravel 7;
[0040] ③ Before the initial setting of the plain concrete 8, a full casing drill is used to cut and form the bite pile hole 6;
[0041] ④ Repeat steps ② and ③ to complete the backfill construction of all reinforcement areas;
[0042] ⑤ Excavate channel 2 according to the designed dimensions;
[0043] ⑥ Drill holes in the gap between the interlocking pile holes 6 below the channel bottom 2-1 and the channel slope 2-2 to form grouting holes 9;
[0044] ⑦ Inject cement slurry into the grouting hole 9 and maintain;
[0045] ⑧ After the channel excavation is completed, a control structure for the excavation rebound of the channel soil above the shallow tunnel is formed.
[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A control structure for the rebound of soil excavation in a channel above a shallow tunnel, characterized by: The invention comprises a proposed channel (2) arranged above an existing tunnel (1), wherein a flexible reinforcement area (4) and a rigid reinforcement area (5) are respectively arranged in the soil between the proposed channel (2) and the existing tunnel (1), wherein the flexible reinforcement area (4) and the rigid reinforcement area (5) are respectively provided with a plurality of interlocking pile holes (6), wherein gravel pile bodies are arranged in the interlocking pile holes (6) corresponding to the flexible reinforcement area (4), and concrete pile bodies are arranged in the interlocking pile holes (6) corresponding to the rigid reinforcement area (5), and grouting holes (9) are arranged in the gaps between the interlocking pile holes (6), and cement slurry is injected into the grouting holes (9).
2. The control structure for soil excavation rebound of the channel above the shallow buried tunnel according to claim 1 is characterized by: The flexible reinforcement area (4) is located above the rigid reinforcement area (5), and the flexible reinforcement area (4) is located below both sides of the proposed channel (2) and above the channel bottom elevation of the proposed channel (2), and the rigid reinforcement area (5) is located below the elevation of the channel bottom (2-1) of the proposed channel (2).
3. The control structure for soil excavation rebound of the channel above the shallow buried tunnel according to claim 2 is characterized by: The flexible reinforcement area (4) and the rigid reinforcement area (5) are both located within the excavation surface of the proposed channel (2).
4. The control structure for soil excavation rebound of the channel above the shallow buried tunnel according to claim 3 is characterized by: The extension lengths of the flexible reinforcement area (4) and the rigid reinforcement area (5) on both sides of the existing tunnel (1) are not less than the outer diameter of the existing tunnel (1).
5. The control structure for soil excavation rebound of the channel above the shallow buried tunnel according to claim 1 is characterized by: The clear distance S between the bottom of the rigid reinforcement zone (5) and the top of the existing tunnel (1) is not less than 2 m, and the thickness H of the rigid reinforcement zone (5) is not less than the excavation depth of the proposed channel (2).
6. The control structure for soil excavation rebound of the channel above the shallow buried tunnel according to claim 1, characterized in that: The interlocking pile holes (6) corresponding to the flexible reinforcement area (4) are filled with graded gravel (7) to form a gravel pile body, and the interlocking pile holes (6) corresponding to the rigid reinforcement area (5) are filled with plain concrete (8) to form the concrete pile body.
7. The control structure for soil excavation rebound of a channel above a shallow buried tunnel according to any one of claims 1 to 6, characterized in that: The engagement width of the engagement pile hole (6) is not less than 0.2 m.