Grouting orifice anti-gushing device for subway segment

Abstract

The utility model provides an anti-gushing device for a grouting orifice of a subway segment, which belongs to the technical field of buildings and comprises a filling bin provided with a cavity with an internal accommodating space; the connecting pipe is arranged on the filling bin, communicates with the cavity, and is connected with a grouting pipe on the subway segment through the end part of the connecting pipe; the lantern ring is arranged at the end, away from the connecting pipe, of the filling bin and communicates with the cavity, the drill rod penetrates through the lantern ring during grouting, and a sealing piece used for blocking a gap between the lantern ring and the drill rod is further arranged in the lantern ring; according to the utility model, back-spraying can be prevented when grouting is carried out on the subway segment, and the back-spraying prevention effect can be further improved by injecting a thick liquid material into the chamber through the oil injection pipe.

Description

Technical Field

[0001] This utility model relates to the field of building equipment technology, specifically to a device for preventing jetting at the grouting orifice of subway tunnel segments. Background Technology

[0002] With the acceleration of urbanization, the safety and stability of subways, as a crucial component of urban transportation, are receiving increasing attention. During long-term operation, subway tunnels may encounter problems such as water leakage and displacement deformation. These issues not only affect normal subway operation but may also threaten passenger safety. Therefore, timely treatment of these defects in subway tunnels is of paramount importance.

[0003] In the treatment of defects in subway tunnels, micro-disturbance grouting is a commonly used technique. However, in practice, problems such as water spraying and mud gushing from the borehole often occur during drilling and grouting. This not only affects the effectiveness of grouting reinforcement but may also cause further damage to the tunnel structure. To overcome these problems, a specialized anti-gushing device is needed to ensure the safety and stability of the grouting reinforcement process.

[0004] Traditional grouting devices are relatively simple in function, mainly focusing on the grouting operation itself, and failing to fully consider the potential for gushing phenomena caused by adverse geological conditions such as high-pressure water and fine sand behind the tunnel segments. When encountering emergencies such as water jetting, mud inrush, or sand inrush caused by high water pressure in the strata, traditional grouting devices can often only take emergency sealing measures and then replace the borehole for treatment. This not only increases the construction difficulty and risk, but may also delay the opportunity for disease treatment.

[0005] Especially in tunnels located beneath water-rich areas or rivers and seas, the geological risks are even greater. Traditional grouting boreholes, once they penetrate the tunnel lining segments, struggle to provide timely and effective emergency response to anomalies such as water or mud inrushes, often resulting in reactive rather than proactive control. Therefore, a more advanced and reliable anti-blowout device is needed to address these challenges. Utility Model Content

[0006] In view of this, the present invention provides a device to prevent backflow at the grouting hole of subway tunnel segments. The present invention can prevent backflow during grouting of subway tunnel segments, and the effect of preventing backflow can be further enhanced by injecting thick liquid into the cavity through the oil injection pipe.

[0007] To solve the above-mentioned technical problems, this utility model provides a device for preventing jetting at the grouting hole of subway tunnel segments, comprising:

[0008] A filling chamber, which has an internal space for storing viscous liquids;

[0009] The connecting pipe is installed on the filling chamber and connected to the cavity. It is also connected to the grouting pipe on the subway segment through the end of the connecting pipe. The connecting pipe is connected to the grouting pipe.

[0010] The collar is located at the end of the filling chamber away from the connecting pipe. The collar and the connecting pipe are on the same axis and are connected to the chamber. The drill rod passes through the collar during grouting. The collar is also equipped with a sealing element to seal the gap between the collar and the drill rod. The sealing element can keep the collar in a sealed state.

[0011] The sealing components consist of several sealing rings installed inside the connecting sleeve.

[0012] The collar has a through hole, and a boss-like structure above the through hole. The sealing ring is placed on the boss-like structure inside the through hole, and a threaded hole is also opened on the wall of the boss-like structure above the through hole, and a clamping nut is installed in the threaded hole.

[0013] The sealing ring is a Y-shaped sealing ring with an opening facing the filling chamber. The lip of the Y-shaped sealing ring can fit tightly against the outer surface of the drill pipe.

[0014] It also includes an oil injection pipe installed on the filling chamber, which is connected to the filling chamber. The oil injection pipe is equipped with a ball valve, which facilitates depressurization or oil injection into the filling chamber.

[0015] The filling chamber is also equipped with a pressure gauge, which can detect the formation water pressure, back pressure, or drilling pressure of the drill pipe inside the filling chamber. The pressure gauge is used to display the pressure inside the filling chamber digitally.

[0016] The end of the connecting pipe is connected to the ball valve at the end of the grouting pipe via a threaded connection, which facilitates quick assembly and disassembly of the grouting structure.

[0017] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0018] 1. Highly Effective Blowout Prevention: This device, through its filling chamber and connected pipes, collar, and seals, forms a complete blowout prevention system. During grouting, even in emergencies such as water jetting or mud inrush caused by high water pressure in the formation, the viscous liquid in the filling chamber responds quickly, effectively preventing backflow. In particular, the Y-shaped sealing ring, with its lip tightly fitting the outer surface of the drill pipe, greatly enhances the sealing performance at the collar, further improving the blowout prevention effect.

[0019] 2. Ease of Operation and Flexibility: The device is designed with ease of operation in mind. The connecting pipe end connects to the ball valve at the grouting pipe end via a threaded connection, facilitating quick assembly and disassembly and improving construction efficiency. Simultaneously, the ball valve on the oil injection pipe allows operators to depressurize or inject oil into the filling chamber as needed, flexibly responding to various working conditions.

[0020] 3. Real-time Monitoring and Safety Assurance: The pressure gauges installed on the filling chamber can monitor key parameters such as formation water pressure, internal back pressure, and drill pipe extrusion pressure in real time, providing construction personnel with intuitive data support. This not only helps to promptly identify and address potential safety hazards but also ensures the safety and stability of the grouting reinforcement process.

[0021] 4. Wide Applicability: This device is not only suitable for treating defects in subway tunnels, but can also be widely applied to other underground engineering fields that require grouting reinforcement and face the risk of gushing. Its compact structure and reliable performance provide strong protection for the safe construction of underground projects. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a grout injection hole anti-gushing device for subway segments according to the present invention;

[0023] Figure 2 This is a structural schematic diagram showing the usage state of this utility model;

[0024] Figure 3 This is a structural schematic diagram of the cross-sectional view of the collar and seal of this utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 100. Filling chamber; 101. Chamber; 200. Connecting pipe; 300. Collar; 301. Perforation; 302. Sealing ring; 303. Threaded hole; 304. Compression nut; 400. Oil injection pipe; 401. Ball valve; 500. Pressure gauge. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the appendices of the embodiments of this utility model. Figure 1-3 The technical solutions of the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0028] A device for preventing jetting at grouting holes in subway tunnel segments, such as Figure 1 , 2As shown: A connecting pipe 200 is connected to a ball valve 401 at the end of the grouting pipe on the subway tunnel segment. At this time, the connecting pipe 200 is connected to the grouting pipe and they are on the same axis. The grout in the connecting pipe 200 can enter the grouting pipe and then into the subway tunnel segment. A filling chamber 100 is also provided at the end of the connecting pipe 200 away from the subway tunnel segment. The filling chamber 100 has a cavity 101 inside, which can be used to hold materials such as drill rods or grout. The connecting pipe 200 is connected to the cavity 101, allowing the grout in the cavity 101 to enter the connecting pipe 200. A collar is also provided on the filling chamber 100. 300, the collar 300 is located on the end of the filling chamber 100 away from the connecting pipe 200. The collar 300 is also connected to the chamber 101 and the collar 300 and the connecting pipe 200 are on the same axis. The grout in the collar 300 can enter the filling chamber 100. When the drill rod is grouting, it can be inserted into the collar 300, the chamber 101, the connecting pipe 200 and even into the grouting pipe, so that the grouting work of the segment can be carried out. In addition, the collar 300 is also provided with a sealing element for sealing the gap between the collar 300 and the drill rod. In this way, the grout will not spray out through the gap between the collar 300 and the drill rod when the grouting work is carried out.

[0029] Specifically, the collar 300 has a through hole 301 running vertically through it, and above the through hole 301 is a boss-shaped groove, such as... Figure 3 As shown: The collar 300 is also provided with a threaded hole 303, which is connected to the boss-shaped groove. The threaded hole 303 is used to install a nut. The nut has a T-shaped structure. The end of the nut with a smaller cross-section can be fixed in the threaded hole 303 by thread engagement. At the same time, the sealing ring 302 is located on the boss-shaped structure of the through hole 301. In this way, after the nut is fixed in the threaded hole 303, the sealing ring 302 can be fixed on the upper surface of the sealing ring 302.

[0030] Furthermore, the sealing rings 302 are arranged in two vertical rows, and are Y-shaped, meaning each Y-shaped sealing ring has an opening. Both openings of the sealing rings 302 face the filling chamber 100. Due to its unique cross-sectional design, the Y-shaped sealing ring 302 provides higher contact pressure and a tighter fit, thus exhibiting excellent sealing performance under high pressure. Experimental data shows that the Y-shaped sealing ring 302 maintains a stable seal under a working pressure of 40 MPa, far exceeding the pressure resistance of ordinary sealing rings 302 (such as O-rings 302).

[0031] It is worth mentioning that the filling chamber 100 is also equipped with an oil injection pipe 400, such as Figure 1 , 2As shown: the oil injection pipe 400 is also connected to the filling chamber 100. The oil injection pipe 400 is also equipped with a ball valve 401. Opening the ball valve 401 allows the thick liquid to be injected into the filling chamber 100 through the oil injection pipe 400.

[0032] Specifically, during the drill pipe retraction process, after the drill pipe end exits the grouting pipe end, the ball valve 401 of the grouting pipe is closed and then the ball valve 401 on the oil injection pipe 400 is opened. In this way, the air pressure or hydraulic pressure in the filling chamber 100 can be depressurized through the oil injection pipe 400, and then the grouting work on the segments can continue. Alternatively, the filling chamber 100 can be cleaned when the ball valve 401 of the grouting pipe is opened.

[0033] Specifically, when backflow occurs in the grouting pipe, the pressure inside the grouting pipe is too high. The drill rod can be retracted a bit until the end of the drill rod exits the grouting pipe. Then, the ball valve 401 of the grouting pipe is closed, and then the ball valve 401 on the oil injection pipe 400 is opened. Then, thick liquid materials such as grease are injected into the filling chamber 100 through the oil injection pipe 400. This can reduce the backflow of grout and further ensure the normal operation of the grouting work.

[0034] Furthermore, the filling chamber 100 is also equipped with a pressure gauge 500, such as... Figure 1 , 2 As shown: Pressure gauge 500 can be used to detect and digitally display the internal pressure of filling chamber 100. That is, when the drill rod is installed but no grouting work is carried out, pressure gauge 500 displays the formation water pressure inside filling chamber 100; when the drill rod is grouting, pressure gauge 500 displays the grout back pressure inside filling chamber 100 (that is, when the drill rod is connected to the grouting machine, pressure gauge 500 displays the grout back pressure, at which time the grouting machine is not working, and pressure gauge 500 is 0; when the value of pressure gauge 500 is greater than the pressure of the grouting machine during grouting, it indicates that the grout back pressure is large, at which time it is necessary to close the ball valve 401 of the grouting pipe and inject thick liquid into filling chamber 100).

[0035] Specifically, the end of the connecting pipe 200 is connected to the ball valve 401 at the end of the grouting pipe via a threaded connection, which facilitates the quick installation or disassembly of the anti-gushing grouting equipment, thereby effectively increasing the grouting efficiency.

[0036] Furthermore, it should be noted that, in the description of this utility model, 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 according to the specific circumstances.

[0037] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A device for preventing jetting at grouting holes in subway tunnel segments, characterized in that: include; A filling chamber (100) having a cavity (101) for internal accommodating space; A connecting pipe (200) is provided on the filling chamber (100) and communicates with the cavity (101), and is connected to the grouting pipe on the subway segment through the end of the connecting pipe (200); A collar (300) is provided on the filling chamber (100) at one end away from the connecting pipe (200) and is connected to the chamber (101). The drill rod passes through the collar (300) during grouting. The collar (300) is also provided with a sealing element for sealing the gap between the collar and the drill rod. It also includes an oil injection pipe (400) installed on the filling chamber (100), and the oil injection pipe (400) is equipped with a ball valve (401), so that the filling chamber (100) can be depressurized or injected with oil through the oil injection pipe (400).

2. The anti-blowout device for grouting holes in subway tunnel segments as described in claim 1, characterized in that: The sealing element is a plurality of sealing rings (302) disposed inside the connecting sleeve.

3. The anti-blowout device for grouting holes in subway tunnel segments as described in claim 2, characterized in that: The collar (300) has a through hole (301) and a boss-shaped structure above the through hole (301). The sealing ring (302) is placed on the boss-shaped structure inside the through hole (301). A threaded hole (303) is also provided on the wall of the boss-shaped structure above the through hole (301). A clamping nut (304) is installed in the threaded hole (303).

4. The anti-gushing device for grouting holes in subway tunnel segments as described in claim 3, characterized in that: The sealing ring (302) is a Y-shaped sealing ring (302) with an opening facing the filling chamber (100).

5. The anti-blowout device for grouting holes in subway tunnel segments as described in claim 4, characterized in that: The filling chamber (100) is also equipped with a pressure gauge (500), which is used to digitally display the pressure inside the filling chamber (100).

6. The anti-blowout device for grouting holes in subway tunnel segments as described in claim 5, characterized in that: The end of the connecting pipe (200) is connected to the ball valve (401) at the end of the grouting pipe via a threaded connection.

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