A secondary grouting device for shield tunnel in water-rich sand layer

Abstract

The utility model is a kind of device suitable for shield tunnel secondary grouting in water-rich sand formation, related to shield tunnel secondary grouting equipment technical field, device is by cross-hole CT device, grouting gun, annular track, grouting pipeline, hydraulic double-liquid grouting pump is formed, and the emission source of cross-hole CT is installed on annular track, and grouting gun is connected by grouting pipeline and hydraulic double-liquid grouting pump.During the operation of device, water bag position is dynamically detected by cross-hole CT device, and accurate and targeted secondary grouting is carried out based on detection result;Cross-hole CT device and grouting gun can move between reserved holes along annular track to quickly respond to detected adverse area, and stability of loose soil body is restored and uniform support to segment is provided by accurate grouting filling;The utility model is aimed at water-rich sand formation normal high water pressure, and the condition that cavity is not clear is judged by grouting pressure, and the blind area caused by invisible defect in grouting can be effectively solved, and the effect of grouting and long-term stability of tunnel are significantly improved.

Description

Technical Field

[0001] This utility model relates to the technical field of secondary grouting equipment for shield tunnels, and in particular to a secondary grouting device for shield tunnels with water-rich sand layers. Background Technology

[0002] When constructing shield tunnels in water-rich sandy strata, the high water pressure and strong permeability of the geological conditions easily lead to the formation of water pockets behind the tunnel segments—a typical engineering problem. When the grouting behind the tunnel segments is not tight enough, cavities or saturated zones rich in high-pressure water, i.e., water pockets, will form around the segments. These water pockets not only cause segment floating, misalignment, and uneven stress on the lining, but also lead to long-term, uneven settlement of the tunnel, increasing the risk of segment leakage.

[0003] Grouting quality is generally judged by grouting pressure and grouting volume. In water-rich sandy strata, the water pressure is high and the grout has a certain degree of water dispersibility. Traditional secondary grouting methods lack the ability to accurately detect the location of water pockets, resulting in a large degree of blindness in grouting operations and making it difficult to effectively eliminate the hazards of water pockets.

[0004] Existing grouting devices are limited in function and cannot achieve rapid switching and dynamic response between detection and grouting. Therefore, there is an urgent need for an integrated device that can accurately detect water sacs and perform targeted grouting treatment. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model discloses a secondary grouting device for a shield tunnel with water-rich sand layers, comprising a ring track module, a geological detection module, and a grouting execution module, wherein the geological detection module and the grouting execution module are both installed on the ring track module; The grouting execution module includes a grouting gun, a grouting hose connected to the grouting gun, a grouting pump fixedly connected to one end of the grouting hose, and the grouting pump fixedly installed on the annular track module.

[0006] Furthermore, the annular track module includes an annular tunnel, at the bottom of which a tunnel boring machine is slidably mounted. The annular tunnel has two mounting seats, the positions of which are determined based on the on-site construction conditions.

[0007] Furthermore, the grouting gun is connected to a mounting base installed on the annular tunnel.

[0008] Furthermore, the geological exploration module includes a cross-hole CT for scanning geological data around the tunnel segment and processing the data through an external system. The cross-hole CT is mounted on another mounting base installed on the annular tunnel.

[0009] The advantages of this utility model compared with the prior art are: 1. It realizes the functional integration of geological exploration and grouting execution, and solves the problems of single function and poor coordination of traditional devices; 2. The circular track system greatly improves the positioning speed and switching efficiency of the detection and grouting components; 3. By dynamically adjusting grouting parameters based on real-time detection data, a transformation from traditional "experience-based grouting" to "precision grouting" has been achieved; 4. It is highly targeted and effectively solves the problem of water pocket control in water-rich sandy strata, ensuring the quality of tunnel construction and long-term safety. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0011] Figure 2 This is a schematic diagram of the overall structure of this utility model from another angle.

[0012] Figure 3 This is a schematic diagram of the state when the present invention is in use.

[0013] Figure 4 This is a schematic diagram showing the installation status of the grouting gun and cross-hole CT of this utility model.

[0014] Figure 5 This is a top view of the overall structure of this utility model.

[0015] Figure 6 This is a side view of the overall structure of this utility model.

[0016] Reference numerals: 1-Circular tunnel; 2-Mounting base; 3-Grouting gun; 4-Cross-hole CT; 5-Grouting pump; 6-Grouting hose; 7-Shield machine. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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 or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] Example: Figures 1-5 As shown, a secondary grouting device for a shield tunnel with a water-rich sand layer includes a ring track module, a geological exploration module, and a grouting execution module, with the geological exploration module and the grouting execution module both installed on the ring track module.

[0021] The grouting execution module includes a grouting gun 3, a grouting hose 6 connected to the grouting gun 3, a grouting pump 5 fixedly connected to one end of the grouting hose 6, and the grouting pump 5 fixedly installed on the annular track module.

[0022] The circular track module includes a circular tunnel 1, with a tunnel boring machine 7 slidably installed at the bottom of the circular tunnel 1. The circular tunnel 1 is installed on two mounting seats 2, and the positions of the two mounting seats 2 on the circular tunnel 1 are determined according to the on-site construction conditions. The grouting gun 3 is connected to one of the mounting seats 2 installed on the circular tunnel 1.

[0023] The geological exploration module includes a cross-hole CT 4 for scanning geological data around the tunnel segments. The cross-hole CT 4 is externally mounted on another mounting base 2 on the annular tunnel 1. The cross-hole CT 4 uses a low-frequency cross-hole radar system, thereby enhancing its penetration of the steel mesh of the tunnel segments and its anti-interference ability.

[0024] In operation, after the shield tunnel segments are assembled, the annular tunnel 1 is slidably connected to the shield machine 7. Then, according to the on-site construction conditions, two mounting bases 2 are fixedly installed on the annular tunnel 1. Next, the cross-hole CT 4, installed on another mounting base 2 on the annular tunnel 1, scans and acquires geological data around the segments. The data detected by the cross-hole CT 4 is then processed by an external system to identify the location, extent, and water abundance of the water sacs. The annular tunnel 1 is then moved, moving the grouting gun 3 installed on one mounting base 2 to the corresponding hole position of the water sac. Based on the analysis results of the external system, the grouting pressure and grout ratio of the grouting gun 3 are set. Subsequently, the grouting pump 5 is started, and grouting is performed through the grouting hose 6 and the grouting gun 3. During the grouting process, the cross-hole CT 4 is periodically reused for retesting, and the filling effect is evaluated in real time through the external system. Grouting parameters are dynamically adjusted or grouting hole positions are switched accordingly. After grouting is completed, the cross-hole CT 4 is used to... 4. Conduct a final inspection to confirm that the water bladder is effectively filled, and then slide along the direction of travel of the tunnel boring machine 7 to the next row of reserved holes, repeating the above operation.

[0025] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A secondary grouting device for shield tunnels in water-rich sand layers, characterized in that: It includes a ring track module, a geological exploration module, and a grouting execution module, wherein the geological exploration module and the grouting execution module are both installed on the ring track module; The grouting execution module includes a grouting gun (3), a grouting hose (6) connected to the grouting gun (3), a grouting pump (5) fixedly connected to one end of the grouting hose (6), and the grouting pump (5) fixedly installed on the annular track module.

2. The secondary grouting device for a water-rich sandy shield tunnel as described in claim 1, characterized in that: The circular track module includes a circular tunnel (1), and a tunnel boring machine (7) is slidably installed at the bottom of the circular tunnel (1). The circular tunnel (1) is installed on two mounting seats (2), and the two mounting seats (2) are installed on the circular tunnel (1) according to the on-site construction conditions.

3. The secondary grouting device for a water-rich sandy shield tunnel as described in claim 2, characterized in that: The grouting gun (3) is connected to a mounting base (2) installed on the annular tunnel (1).

4. The secondary grouting device for a water-rich sandy shield tunnel as described in claim 3, characterized in that: The geological exploration module includes a cross-hole CT (4) for scanning geological data around the tunnel segment and processing the data through an external system. The cross-hole CT (4) is mounted on another mounting base (2) installed on the annular tunnel (1).

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