Deep hole grouting structure for surface of large buried depth water-rich broken stratum

Abstract

The utility model discloses a deep hole grouting structure for the surface of big buried depth water -rich broken stratum, relates to underground engineering reinforcing technical field, including surface deep hole, surface deep hole is equipped with a plurality, and surface deep hole is parallel between each other, surface deep hole is from top to bottom and extends to the broken stratum below the surface, grouting pipeline is equipped with a plurality, and the surface of grouting pipeline is provided with a plurality of grouting hole, grouting pipe seals the pipe, and the outside of grouting pipeline is sleeved. The deep hole grouting structure for the surface of big buried depth water -rich broken stratum, adopt the mode of single -hole multichannel buried step -by -step graded injection, and the structure of grouting of the utility model has the characteristics of graded diffusion, multi -point injection, guarantees the diffusion range of grout, and improves grouting reinforcing effect.

Description

Technical Field

[0001] This utility model relates to the field of underground engineering reinforcement technology, specifically to a deep-hole grouting structure for the surface of deep-buried, water-rich, and fractured strata. Background Technology

[0002] The development of urban rail transit engineering has become an industry trend. Among them, underground space operations such as subways, intercity railways, and utility tunnels are the most common. When encountering complex strata, the method of drilling holes on the surface and burying grout is usually adopted. That is, mechanical drilling is used to drill holes from the surface to the area of ​​the strata that need to be reinforced, and grouting pipes with pre-drilled holes are buried. The reinforcing grout is pumped from the surface and diffused through the grouting pipe holes using pressure difference to consolidate the broken strata and achieve strata reinforcement.

[0003] This invention relates to a method for grouting deep, water-rich, and fractured strata. By embedding grouting pipes in grouting holes in stages and multiple sections, a graded injection and diffusion process is achieved. This avoids blockage of single holes and single pipes, which can lead to abandoned holes and poor reinforcement effects. The result is a multi-point injection and stepped diffusion grouting effect, which effectively improves the reinforcement of the strata.

[0004] Traditional deep-hole grouting structures have the following drawbacks: single-pipe grouting is prone to blockage due to rapid solidification of grout in water-rich strata, resulting in a borehole utilization rate of less than 60%; grout diffusion in fractured strata is anisotropic, and single-point grouting is prone to local enrichment, resulting in uneven overall reinforcement; grouting pressure attenuation is significant under deep burial conditions, and the effective diffusion radius is only 40-70% of the design value. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a deep-hole grouting structure for the surface of deep-buried, water-rich, fractured strata, thus solving the problems mentioned in the background section.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a deep-hole grouting structure for the surface of deep-buried, water-rich, fractured strata, including multiple deep-holes on the surface, which are parallel to each other.

[0007] The deep surface borehole penetrates the surface from top to bottom and extends into the fractured strata beneath it;

[0008] Multiple grouting pipes are provided, and multiple grouting holes are opened on the surface of the grouting pipes;

[0009] The grouting pipe is a sealing pipe that is fitted over the outside of the grouting pipe.

[0010] Optionally, the plurality of grouting pipes are parallel to each other.

[0011] Optionally, each of the aforementioned deep surface boreholes contains three or more grouting pipes.

[0012] Optionally, the outer edge of the grouting pipe seal is fitted with the inner wall of the deep surface borehole.

[0013] This utility model provides a deep-hole grouting structure for use on the surface of deep-buried, water-rich, fractured strata, which has the following beneficial effects:

[0014] This deep-hole grouting structure, used for deep-buried, water-rich, fractured strata, employs a multi-pipe redundancy design. Even if one grouting pipe becomes blocked, the remaining pipes can continue operating, increasing the system's fault tolerance by 300%. Actual engineering data shows that, under the same geological conditions, the effective utilization rate of the borehole formed by this method reaches 92.3%, a significant improvement over traditional methods. Ground-penetrating radar detection indicates that the coefficient of variation of grout distribution in the reinforced area decreases from 0.68 in the traditional method to 0.41, improving uniformity by 39.7%. Through multi-pipe diversion and stepped pressurization strategies, pressure loss is reduced: at a burial depth of 68m, the measured bottom pressure is 87.6% of the surface pump pressure (compared to only 52.3% in the traditional method). For the same amount of reinforcement, the power consumption of this method is only 2.1 kW·h / m. 3 Compared with the traditional method (3.4 kW·h / m 3 Energy saving of 38.2%. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0016] Figure 2 This is an enlarged schematic diagram of the grouting pipe structure in this utility model;

[0017] Figure 3 This is a schematic diagram of the distribution of conventional grouting pipes.

[0018] In the diagram: 1. Deep surface borehole; 2. Grouting pipe; 3. Grouting hole; 4. Fractured strata; 5. Grouting pipe sealing. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., 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. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Please see Figures 1 to 3 This utility model provides a technical solution: a deep hole grouting structure for the surface of deep-buried, water-rich, fractured strata, including a surface deep hole 1, which is provided in multiple ways and is parallel to each other.

[0023] The deep surface borehole 1 penetrates the surface from top to bottom and extends to the fractured strata 4 below it;

[0024] Multiple grouting pipes 2 are provided, and multiple grouting holes 3 are opened on the surface of the grouting pipes 2;

[0025] Grouting pipe sealing pipe 5 is sleeved on the outside of grouting pipe 2.

[0026] In this embodiment, as Figure 1 As shown, multiple grouting pipes 2 are parallel to each other.

[0027] In this embodiment, as Figure 1 As shown, each deep borehole 1 on the surface has more than three grouting pipes 2 inserted into it.

[0028] In this embodiment, as Figure 1 As shown, the outer edge of the grouting pipe sealing pipe 5 is bonded to the inner wall of the deep surface borehole 1.

[0029] Table 1. Comparison of borehole utilization rate test data (a sandstone fracture zone project)

[0030]

[0031]

[0032] Conclusion: The uniformity of slurry diffusion was improved by 40% through stepped pressure control (0.8→2.8MPa) and graded opening design, forming a three-layer progressive diffusion ring.

[0033] Level 1 grouting: Grout penetrates along the main fracture network (diffusion radius R1 = 3.2 ± 0.5 m);

[0034] Secondary grouting: filling secondary fractures under medium pressure (R2 = 2.1 ± 0.3 m);

[0035] Level 3 grouting: High-pressure compaction of micropores (R3 = 1.5 ± 0.2 m).

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A deep-hole grouting structure for use on the surface of deep-buried, water-rich, fractured strata, comprising a deep-hole surface (1), characterized in that: The surface deep boreholes (1) are provided in multiple ways and are parallel to each other; The deep surface borehole (1) penetrates the surface from top to bottom and extends to the fractured strata (4) below it; The grouting pipe (2) is provided with multiple grouting pipes (2), and multiple grouting holes (3) are opened on the surface of the grouting pipe (2); The grouting pipe sealing pipe (5) is fitted outside the grouting pipe (2).

2. The deep-hole grouting structure for deep-buried, water-rich, fractured strata as described in claim 1, characterized in that: The multiple grouting pipes (2) are parallel to each other.

3. The deep-hole grouting structure for deep-buried, water-rich, fractured strata as described in claim 1, characterized in that: Each of the aforementioned deep surface boreholes (1) contains three or more grouting pipes (2).

4. The deep-hole grouting structure for deep-buried, water-rich, fractured strata as described in claim 1, characterized in that: The outer edge of the grouting pipe sealing pipe (5) is fitted with the inner wall of the deep surface hole (1).

Images